diff --git a/.eslintrc b/.eslintrc
index ee87fe67..8fe8ddc5 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -18,7 +18,8 @@
         ],
     "quotes": [
         "error",
-        "single"
+        "single",
+        { "allowTemplateLiterals": true }
     ],
     "semi": [
         "error",
diff --git a/.travis.yml b/.travis.yml
index 1dc12c8a..884b772b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -60,6 +60,16 @@ matrix:
              ./build.sh) || exit 1;
           done
 
+    # The `web-sys` crate's tests pass on nightly.
+    - rust: nightly
+      env: JOB=test-web-sys
+      before_install: *INSTALL_NODE_VIA_NVM
+      install:
+        - npm install
+      script: cargo test --manifest-path crates/web-sys/Cargo.toml
+      addons:
+        firefox: latest
+
     # Tests pass on nightly using yarn
     - rust: nightly
       env: JOB=test-yarn-smoke
diff --git a/Cargo.toml b/Cargo.toml
index 3c937aee..aef8c661 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -40,6 +40,7 @@ members = [
   "crates/cli",
   "crates/typescript",
   "crates/webidl",
+  "crates/web-sys",
   "examples/hello_world",
   "examples/smorgasboard",
   "examples/console_log",
diff --git a/crates/backend/src/defined.rs b/crates/backend/src/defined.rs
new file mode 100644
index 00000000..7ca80376
--- /dev/null
+++ b/crates/backend/src/defined.rs
@@ -0,0 +1,256 @@
+use ast;
+use proc_macro2::Ident;
+use syn;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum ImportedTypeKind {
+    /// The definition of an imported type.
+    Definition,
+    /// A reference to an imported type.
+    Reference,
+}
+
+/// Iterate over definitions of and references to imported types in the AST.
+pub trait ImportedTypes {
+    fn imported_types<F>(&self, f: &mut F)
+    where
+        F: FnMut(&Ident, ImportedTypeKind);
+}
+
+/// Iterate over definitions of imported types in the AST.
+pub trait ImportedTypeDefinitions {
+    fn imported_type_definitions<F>(&self, f: &mut F)
+    where
+        F: FnMut(&Ident);
+}
+
+impl<T> ImportedTypeDefinitions for T
+where
+    T: ImportedTypes,
+{
+    fn imported_type_definitions<F>(&self, f: &mut F)
+    where
+        F: FnMut(&Ident),
+    {
+        self.imported_types(&mut |id, kind| {
+            if let ImportedTypeKind::Definition = kind {
+                f(id);
+            }
+        });
+    }
+}
+
+/// Iterate over references to imported types in the AST.
+pub trait ImportedTypeReferences {
+    fn imported_type_references<F>(&self, f: &mut F)
+    where
+        F: FnMut(&Ident);
+}
+
+impl<T> ImportedTypeReferences for T
+where
+    T: ImportedTypes,
+{
+    fn imported_type_references<F>(&self, f: &mut F)
+    where
+        F: FnMut(&Ident),
+    {
+        self.imported_types(&mut |id, kind| {
+            if let ImportedTypeKind::Reference = kind {
+                f(id);
+            }
+        });
+    }
+}
+
+impl ImportedTypes for ast::Program {
+    fn imported_types<F>(&self, f: &mut F)
+    where
+        F: FnMut(&Ident, ImportedTypeKind),
+    {
+        self.imports.imported_types(f);
+        self.type_aliases.imported_types(f);
+    }
+}
+
+impl<T> ImportedTypes for Vec<T>
+where
+    T: ImportedTypes,
+{
+    fn imported_types<F>(&self, f: &mut F)
+    where
+        F: FnMut(&Ident, ImportedTypeKind),
+    {
+        for x in self {
+            x.imported_types(f);
+        }
+    }
+}
+
+impl ImportedTypes for ast::Import {
+    fn imported_types<F>(&self, f: &mut F)
+    where
+        F: FnMut(&Ident, ImportedTypeKind),
+    {
+        self.kind.imported_types(f)
+    }
+}
+
+impl ImportedTypes for ast::ImportKind {
+    fn imported_types<F>(&self, f: &mut F)
+    where
+        F: FnMut(&Ident, ImportedTypeKind),
+    {
+        match self {
+            ast::ImportKind::Static(s) => s.imported_types(f),
+            ast::ImportKind::Function(fun) => fun.imported_types(f),
+            ast::ImportKind::Type(ty) => ty.imported_types(f),
+        }
+    }
+}
+
+impl ImportedTypes for ast::ImportStatic {
+    fn imported_types<F>(&self, f: &mut F)
+    where
+        F: FnMut(&Ident, ImportedTypeKind),
+    {
+        self.ty.imported_types(f);
+    }
+}
+
+impl ImportedTypes for syn::Type {
+    fn imported_types<F>(&self, f: &mut F)
+    where
+        F: FnMut(&Ident, ImportedTypeKind),
+    {
+        match self {
+            syn::Type::Reference(ref r) => r.imported_types(f),
+            syn::Type::Path(ref p) => p.imported_types(f),
+            _ => {}
+        }
+    }
+}
+
+impl ImportedTypes for syn::TypeReference {
+    fn imported_types<F>(&self, f: &mut F)
+    where
+        F: FnMut(&Ident, ImportedTypeKind),
+    {
+        self.elem.imported_types(f);
+    }
+}
+
+impl ImportedTypes for syn::TypePath {
+    fn imported_types<F>(&self, f: &mut F)
+    where
+        F: FnMut(&Ident, ImportedTypeKind),
+    {
+        if self.qself.is_some()
+            || self.path.leading_colon.is_some()
+            || self.path.segments.len() != 1
+        {
+            return;
+        }
+        f(
+            &self.path.segments.last().unwrap().value().ident,
+            ImportedTypeKind::Reference,
+        );
+    }
+}
+
+impl ImportedTypes for ast::ImportFunction {
+    fn imported_types<F>(&self, f: &mut F)
+    where
+        F: FnMut(&Ident, ImportedTypeKind),
+    {
+        self.function.imported_types(f);
+        self.kind.imported_types(f);
+    }
+}
+
+impl ImportedTypes for ast::ImportFunctionKind {
+    fn imported_types<F>(&self, f: &mut F)
+    where
+        F: FnMut(&Ident, ImportedTypeKind),
+    {
+        match self {
+            ast::ImportFunctionKind::Method { ty, .. } => ty.imported_types(f),
+            ast::ImportFunctionKind::Normal => {}
+        }
+    }
+}
+
+impl ImportedTypes for ast::Function {
+    fn imported_types<F>(&self, f: &mut F)
+    where
+        F: FnMut(&Ident, ImportedTypeKind),
+    {
+        self.arguments.imported_types(f);
+        if let Some(ref r) = self.ret {
+            r.imported_types(f);
+        }
+    }
+}
+
+impl ImportedTypes for syn::ArgCaptured {
+    fn imported_types<F>(&self, f: &mut F)
+    where
+        F: FnMut(&Ident, ImportedTypeKind),
+    {
+        self.ty.imported_types(f);
+    }
+}
+
+impl ImportedTypes for ast::ImportType {
+    fn imported_types<F>(&self, f: &mut F)
+    where
+        F: FnMut(&Ident, ImportedTypeKind),
+    {
+        f(&self.name, ImportedTypeKind::Definition);
+    }
+}
+
+impl ImportedTypes for ast::TypeAlias {
+    fn imported_types<F>(&self, f: &mut F)
+    where
+        F: FnMut(&Ident, ImportedTypeKind),
+    {
+        f(&self.dest, ImportedTypeKind::Reference);
+    }
+}
+
+/// Remove any methods, statics, &c, that reference types that are *not*
+/// defined.
+pub trait RemoveUndefinedImports {
+    fn remove_undefined_imports<F>(&mut self, is_defined: &F)
+    where
+        F: Fn(&Ident) -> bool;
+}
+
+impl RemoveUndefinedImports for ast::Program {
+    fn remove_undefined_imports<F>(&mut self, is_defined: &F)
+    where
+        F: Fn(&Ident) -> bool,
+    {
+        self.imports.remove_undefined_imports(is_defined);
+        self.type_aliases.remove_undefined_imports(is_defined);
+    }
+}
+
+impl<T> RemoveUndefinedImports for Vec<T>
+where
+    T: ImportedTypeReferences,
+{
+    fn remove_undefined_imports<F>(&mut self, is_defined: &F)
+    where
+        F: Fn(&Ident) -> bool,
+    {
+        self.retain(|x| {
+            let mut all_defined = true;
+            x.imported_type_references(&mut |id| {
+                all_defined = all_defined && is_defined(id);
+            });
+            all_defined
+        });
+    }
+}
diff --git a/crates/backend/src/lib.rs b/crates/backend/src/lib.rs
index 40181999..5eca3c23 100755
--- a/crates/backend/src/lib.rs
+++ b/crates/backend/src/lib.rs
@@ -11,4 +11,5 @@ extern crate wasm_bindgen_shared as shared;
 
 pub mod ast;
 mod codegen;
+pub mod defined;
 pub mod util;
diff --git a/crates/cli-support/src/js/mod.rs b/crates/cli-support/src/js/mod.rs
index 176908f1..3a95720c 100644
--- a/crates/cli-support/src/js/mod.rs
+++ b/crates/cli-support/src/js/mod.rs
@@ -284,6 +284,40 @@ impl<'a> Context<'a> {
             ))
         })?;
 
+        self.bind("__wbindgen_is_object", &|me| {
+            me.expose_get_object();
+            Ok(String::from(
+                "
+                function(i) {
+                    const val = getObject(i);
+                    return typeof(val) === 'object' && val !== null ? 1 : 0;
+                }
+                ",
+            ))
+        })?;
+
+        self.bind("__wbindgen_is_function", &|me| {
+            me.expose_get_object();
+            Ok(String::from(
+                "
+                function(i) {
+                    return typeof(getObject(i)) === 'function' ? 1 : 0;
+                }
+                ",
+            ))
+        })?;
+
+        self.bind("__wbindgen_is_string", &|me| {
+            me.expose_get_object();
+            Ok(String::from(
+                "
+                function(i) {
+                    return typeof(getObject(i)) === 'string' ? 1 : 0;
+                }
+                ",
+            ))
+        })?;
+
         self.bind("__wbindgen_string_get", &|me| {
             me.expose_pass_string_to_wasm()?;
             me.expose_get_object();
@@ -1501,7 +1535,7 @@ impl<'a> Context<'a> {
                 if (desc) return desc;
                 obj = Object.getPrototypeOf(obj);
               }
-              throw new Error('descriptor not found');
+              throw new Error(`descriptor for id='${id}' not found`);
             }
             ",
         );
@@ -1866,11 +1900,24 @@ impl<'a, 'b> SubContext<'a, 'b> {
                             }
                         };
 
+                        let fallback = if import.structural {
+                            "".to_string()
+                        } else {
+                            format!(
+                                " || function() {{
+                                    throw new Error(`wasm-bindgen: {} does not exist`);
+                                }}",
+                                target
+                            )
+                        };
+
                         self.cx.global(&format!(
                             "
-                            const {}_target = {};
+                            const {}_target = {} {} ;
                             ",
-                            import.shim, target
+                            import.shim,
+                            target,
+                            fallback
                         ));
                         format!(
                             "{}_target{}",
diff --git a/crates/test-project-builder/src/lib.rs b/crates/test-project-builder/src/lib.rs
index dd296ae2..2ce5d97e 100644
--- a/crates/test-project-builder/src/lib.rs
+++ b/crates/test-project-builder/src/lib.rs
@@ -16,6 +16,7 @@ use std::time::{Duration, Instant};
 static CNT: AtomicUsize = ATOMIC_USIZE_INIT;
 thread_local!(static IDX: usize = CNT.fetch_add(1, Ordering::SeqCst));
 
+#[derive(Clone)]
 pub struct Project {
     files: Vec<(String, String)>,
     debug: bool,
@@ -423,18 +424,17 @@ impl Project {
             buildrs.push_str(&format!(
                 r#"
                 fs::create_dir_all("{}").unwrap();
+                let bindings = compile_file(Path::new("{}")).expect("should compile OK");
+                println!("generated WebIDL bindings = '''\n{{}}\n'''", bindings);
+
                 File::create(&Path::new(&dest).join("{}"))
                     .unwrap()
-                    .write_all(
-                        compile_file(Path::new("{}"))
-                            .unwrap()
-                            .as_bytes()
-                    )
+                    .write_all(bindings.as_bytes())
                     .unwrap();
                 "#,
                 path.parent().unwrap().to_str().unwrap(),
-                path.to_str().unwrap(),
                 origpath.to_str().unwrap(),
+                path.to_str().unwrap(),
             ));
 
             self.files.push((
@@ -477,8 +477,8 @@ impl Project {
         }
 
         runjs.push_str("
-            function run(test, wasm) {
-                test.test();
+            async function run(test, wasm) {
+                await test.test();
 
                 if (wasm.assertStackEmpty)
                     wasm.assertStackEmpty();
@@ -544,11 +544,13 @@ impl Project {
             assert!(modules.is_empty());
             runjs.push_str("
                 const test = require('./test');
-                try {
-                    run(test, {});
-                } catch (e) {
-                    onerror(e);
-                }
+                (async function () {
+                    try {
+                        await run(test, {});
+                    } catch (e) {
+                        onerror(e);
+                    }
+                }());
             ");
         }
         self.files.push(("run.js".to_string(), runjs));
@@ -560,6 +562,7 @@ impl Project {
         let (root, target_dir) = self.build();
         let mut cmd = Command::new("cargo");
         cmd.arg("build")
+            .arg("-vv")
             .arg("--target")
             .arg("wasm32-unknown-unknown")
             .current_dir(&root)
@@ -638,12 +641,15 @@ impl Project {
 
         // move files from the root into each test, it looks like this may be
         // needed for webpack to work well when invoked concurrently.
-        fs::hard_link("package.json", root.join("package.json")).unwrap();
-        if !Path::new("node_modules").exists() {
+        let mut cwd = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
+        cwd.pop(); // chop off test-project-builder
+        cwd.pop(); // chop off crates
+        fs::copy(cwd.join("package.json"), root.join("package.json")).unwrap();
+        let modules = cwd.join("node_modules");
+        if !modules.exists() {
             panic!("\n\nfailed to find `node_modules`, have you run `npm install` yet?\n\n");
         }
-        let cwd = env::current_dir().unwrap();
-        symlink_dir(&cwd.join("node_modules"), &root.join("node_modules")).unwrap();
+        symlink_dir(&modules, &root.join("node_modules")).unwrap();
 
         if self.headless {
             return self.test_headless(&root)
@@ -677,7 +683,12 @@ impl Project {
         lazy_static! {
             static ref MUTEX: Mutex<()> = Mutex::new(());
         }
-        let _lock = MUTEX.lock();
+        let _lock = {
+            let _x = wrap_step("waiting on headless test lock");
+            // Don't panic on a poisoned mutex, since we only use it to
+            // serialize servers.
+            MUTEX.lock().unwrap_or_else(|poisoned| poisoned.into_inner())
+        };
 
         let mut cmd = self.npm();
         cmd.arg("run")
@@ -686,20 +697,29 @@ impl Project {
             .arg("--quiet")
             .arg("--watch-stdin")
             .current_dir(&root);
-        let _server = run_in_background(&mut cmd, "webpack-dev-server".into());
+        let mut server = run_in_background(&mut cmd, "webpack-dev-server".into());
 
         // wait for webpack-dev-server to come online and bind its port
-        loop {
-            if TcpStream::connect("127.0.0.1:8080").is_ok() {
-                break;
+        {
+            let _x = wrap_step("waiting for webpack-dev-server");
+
+            loop {
+                if TcpStream::connect("127.0.0.1:8080").is_ok() {
+                    break;
+                }
+                if server.exited() {
+                    panic!("webpack-dev-server exited during headless test initialization")
+                }
+                thread::sleep(Duration::from_millis(100));
             }
-            thread::sleep(Duration::from_millis(100));
         }
 
         let path = env::var_os("PATH").unwrap_or_default();
         let mut path = env::split_paths(&path).collect::<Vec<_>>();
         path.push(root.join("node_modules/geckodriver"));
 
+        let _x = wrap_step("running headless test");
+
         let mut cmd = Command::new("node");
         cmd.args(&self.node_args)
             .arg(root.join("run-headless.js"))
@@ -775,6 +795,12 @@ struct BackgroundChild {
     stderr: Option<thread::JoinHandle<io::Result<String>>>,
 }
 
+impl BackgroundChild {
+    pub fn exited(&mut self) -> bool {
+        self.child.try_wait().expect("should try_wait OK").is_some()
+    }
+}
+
 impl Drop for BackgroundChild {
     fn drop(&mut self) {
         drop(self.stdin.take());
diff --git a/crates/web-sys/Cargo.toml b/crates/web-sys/Cargo.toml
new file mode 100644
index 00000000..1605ddea
--- /dev/null
+++ b/crates/web-sys/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+name = "web-sys"
+version = "0.1.0"
+authors = ["Nick Fitzgerald <fitzgen@gmail.com>"]
+readme = "./README.md"
+
+[build-dependencies]
+env_logger = "0.5.10"
+failure = "0.1"
+wasm-bindgen-webidl = { path = "../webidl", version = "=0.2.11" }
+
+[dependencies]
+wasm-bindgen = { path = "../..", version = "=0.2.11" }
+
+[dev-dependencies]
+wasm-bindgen-test-project-builder = { path = "../test-project-builder", version = '=0.2.11' }
diff --git a/crates/web-sys/README.md b/crates/web-sys/README.md
new file mode 100644
index 00000000..8e363928
--- /dev/null
+++ b/crates/web-sys/README.md
@@ -0,0 +1,3 @@
+# `web-sys`
+
+Raw bindings to Web APIs for projects using `wasm-bindgen`.
diff --git a/crates/web-sys/build.rs b/crates/web-sys/build.rs
new file mode 100644
index 00000000..df2b2742
--- /dev/null
+++ b/crates/web-sys/build.rs
@@ -0,0 +1,50 @@
+extern crate env_logger;
+extern crate failure;
+extern crate wasm_bindgen_webidl;
+
+use failure::ResultExt;
+use std::env;
+use std::fs;
+use std::io::Write;
+use std::path;
+use std::process;
+
+fn main() {
+    if let Err(e) = try_main() {
+        eprintln!("Error: {}", e);
+        for c in e.causes().skip(1) {
+            eprintln!("  caused by {}", c);
+        }
+        process::exit(1);
+    }
+}
+
+fn try_main() -> Result<(), failure::Error> {
+    println!("cargo:rerun-if-changed=build.rs");
+    env_logger::init();
+
+    println!("cargo:rerun-if-changed=webidls/enabled");
+    let entries = fs::read_dir("webidls/enabled").context("reading webidls/enabled directory")?;
+
+    let mut contents = String::new();
+    for entry in entries {
+        let entry = entry.context("getting webidls/enabled/* entry")?;
+        println!("cargo:rerun-if-changed={}", entry.path().display());
+
+        let this_contents =
+            fs::read_to_string(entry.path()).context("reading WebIDL file contents")?;
+        contents.push_str(&this_contents);
+    }
+
+    let bindings = wasm_bindgen_webidl::compile(&contents)
+        .context("compiling WebIDL into wasm-bindgen bindings")?;
+
+    let out_dir = env::var("OUT_DIR").context("reading OUT_DIR environment variable")?;
+    let mut out_file = fs::File::create(path::Path::new(&out_dir).join("bindings.rs"))
+        .context("creating output bindings file")?;
+    out_file
+        .write_all(bindings.as_bytes())
+        .context("writing bindings to output file")?;
+
+    Ok(())
+}
diff --git a/crates/web-sys/src/lib.rs b/crates/web-sys/src/lib.rs
new file mode 100755
index 00000000..33883a66
--- /dev/null
+++ b/crates/web-sys/src/lib.rs
@@ -0,0 +1,5 @@
+#![feature(wasm_custom_section, wasm_import_module)]
+
+extern crate wasm_bindgen;
+
+include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
diff --git a/crates/web-sys/tests/all/event.rs b/crates/web-sys/tests/all/event.rs
new file mode 100644
index 00000000..7025fdf5
--- /dev/null
+++ b/crates/web-sys/tests/all/event.rs
@@ -0,0 +1,54 @@
+use super::project;
+
+#[test]
+fn event() {
+    project()
+        .add_local_dependency("web-sys", env!("CARGO_MANIFEST_DIR"))
+        .headless(true)
+        .file(
+            "src/lib.rs",
+            r#"
+                #![feature(proc_macro, wasm_custom_section)]
+                extern crate wasm_bindgen;
+                use wasm_bindgen::prelude::*;
+                extern crate web_sys;
+
+                #[wasm_bindgen]
+                pub fn test_event(event: &web_sys::Event) {
+                    // These should match `new Event`.
+                    assert!(event.bubbles());
+                    assert!(event.cancelable());
+                    assert!(event.composed());
+
+                    // The default behavior not initially prevented, but after
+                    // we call `prevent_default` it better be.
+                    assert!(!event.default_prevented());
+                    event.prevent_default();
+                    assert!(event.default_prevented());
+                }
+            "#,
+        )
+        .file(
+            "test.js",
+            r#"
+                import * as assert from "assert";
+                import * as wasm from "./out";
+
+                export async function test() {
+                    await new Promise(resolve => {
+                        window.addEventListener("test-event", e => {
+                          wasm.test_event(e);
+                          resolve();
+                        });
+
+                        window.dispatchEvent(new Event("test-event", {
+                            bubbles: true,
+                            cancelable: true,
+                            composed: true,
+                        }));
+                    });
+                }
+            "#,
+        )
+        .test();
+}
diff --git a/crates/web-sys/tests/all/main.rs b/crates/web-sys/tests/all/main.rs
new file mode 100644
index 00000000..577a7f30
--- /dev/null
+++ b/crates/web-sys/tests/all/main.rs
@@ -0,0 +1,4 @@
+extern crate wasm_bindgen_test_project_builder as project_builder;
+use project_builder::project;
+
+mod event;
diff --git a/crates/web-sys/webidls/available/AbortController.webidl b/crates/web-sys/webidls/available/AbortController.webidl
new file mode 100644
index 00000000..19a8f8a6
--- /dev/null
+++ b/crates/web-sys/webidls/available/AbortController.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dom.spec.whatwg.org/#abortcontroller
+ */
+
+[Constructor(), Exposed=(Window,Worker,System)]
+interface AbortController {
+  readonly attribute AbortSignal signal;
+
+  void abort();
+};
diff --git a/crates/web-sys/webidls/available/AbortSignal.webidl b/crates/web-sys/webidls/available/AbortSignal.webidl
new file mode 100644
index 00000000..6b66f76c
--- /dev/null
+++ b/crates/web-sys/webidls/available/AbortSignal.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dom.spec.whatwg.org/#abortsignal
+ */
+
+[Exposed=(Window,Worker,System)]
+interface AbortSignal : EventTarget {
+  readonly attribute boolean aborted;
+
+  attribute EventHandler onabort;
+};
diff --git a/crates/web-sys/webidls/available/AbstractWorker.webidl b/crates/web-sys/webidls/available/AbstractWorker.webidl
new file mode 100644
index 00000000..7ea6e367
--- /dev/null
+++ b/crates/web-sys/webidls/available/AbstractWorker.webidl
@@ -0,0 +1,10 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[NoInterfaceObject, Exposed=(Window,Worker,System)]
+interface AbstractWorker {
+    attribute EventHandler onerror;
+};
diff --git a/crates/web-sys/webidls/available/AnalyserNode.webidl b/crates/web-sys/webidls/available/AnalyserNode.webidl
new file mode 100644
index 00000000..73c697f0
--- /dev/null
+++ b/crates/web-sys/webidls/available/AnalyserNode.webidl
@@ -0,0 +1,48 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary AnalyserOptions : AudioNodeOptions {
+             unsigned long fftSize = 2048;
+             double        maxDecibels = -30;
+             double        minDecibels = -100;
+             double        smoothingTimeConstant = 0.8;
+};
+
+[Pref="dom.webaudio.enabled",
+ Constructor(BaseAudioContext context, optional AnalyserOptions options)]
+interface AnalyserNode : AudioNode {
+
+    // Real-time frequency-domain data
+    void getFloatFrequencyData(Float32Array array);
+    void getByteFrequencyData(Uint8Array array);
+
+    // Real-time waveform data
+    void getFloatTimeDomainData(Float32Array array);
+    void getByteTimeDomainData(Uint8Array array);
+
+    [SetterThrows, Pure]
+    attribute unsigned long fftSize;
+    [Pure]
+    readonly attribute unsigned long frequencyBinCount;
+
+    [SetterThrows, Pure]
+    attribute double minDecibels;
+    [SetterThrows, Pure]
+    attribute double maxDecibels;
+
+    [SetterThrows, Pure]
+    attribute double smoothingTimeConstant;
+
+};
+
+// Mozilla extension
+AnalyserNode implements AudioNodePassThrough;
diff --git a/crates/web-sys/webidls/available/Animation.webidl b/crates/web-sys/webidls/available/Animation.webidl
new file mode 100644
index 00000000..6ef41bad
--- /dev/null
+++ b/crates/web-sys/webidls/available/Animation.webidl
@@ -0,0 +1,55 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/web-animations/#animation
+ *
+ * Copyright © 2015 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum AnimationPlayState { "idle", "running", "paused", "finished" };
+
+[Func="nsDocument::IsElementAnimateEnabled",
+ Constructor (optional AnimationEffect? effect = null,
+              optional AnimationTimeline? timeline)]
+interface Animation : EventTarget {
+  attribute DOMString id;
+  [Func="nsDocument::IsWebAnimationsEnabled", Pure]
+  attribute AnimationEffect? effect;
+  [Func="nsDocument::IsWebAnimationsEnabled"]
+  attribute AnimationTimeline? timeline;
+  [BinaryName="startTimeAsDouble"]
+  attribute double? startTime;
+  [SetterThrows, BinaryName="currentTimeAsDouble"]
+  attribute double? currentTime;
+
+           attribute double             playbackRate;
+  [BinaryName="playStateFromJS"]
+  readonly attribute AnimationPlayState playState;
+  [BinaryName="pendingFromJS"]
+  readonly attribute boolean            pending;
+  [Func="nsDocument::IsWebAnimationsEnabled", Throws]
+  readonly attribute Promise<Animation> ready;
+  [Func="nsDocument::IsWebAnimationsEnabled", Throws]
+  readonly attribute Promise<Animation> finished;
+           attribute EventHandler       onfinish;
+           attribute EventHandler       oncancel;
+  void cancel ();
+  [Throws]
+  void finish ();
+  [Throws, BinaryName="playFromJS"]
+  void play ();
+  [Throws, BinaryName="pauseFromJS"]
+  void pause ();
+  void updatePlaybackRate (double playbackRate);
+  [Throws]
+  void reverse ();
+};
+
+// Non-standard extensions
+partial interface Animation {
+  [ChromeOnly] readonly attribute boolean isRunningOnCompositor;
+};
diff --git a/crates/web-sys/webidls/available/AnimationEffect.webidl b/crates/web-sys/webidls/available/AnimationEffect.webidl
new file mode 100644
index 00000000..81a04b21
--- /dev/null
+++ b/crates/web-sys/webidls/available/AnimationEffect.webidl
@@ -0,0 +1,65 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/web-animations/#animationeffectreadonly
+ *
+ * Copyright © 2015 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum FillMode {
+  "none",
+  "forwards",
+  "backwards",
+  "both",
+  "auto"
+};
+
+enum PlaybackDirection {
+  "normal",
+  "reverse",
+  "alternate",
+  "alternate-reverse"
+};
+
+dictionary EffectTiming {
+  double                              delay = 0.0;
+  double                              endDelay = 0.0;
+  FillMode                            fill = "auto";
+  double                              iterationStart = 0.0;
+  unrestricted double                 iterations = 1.0;
+  (unrestricted double or DOMString)  duration = "auto";
+  PlaybackDirection                   direction = "normal";
+  DOMString                           easing = "linear";
+};
+
+dictionary OptionalEffectTiming {
+  double                              delay;
+  double                              endDelay;
+  FillMode                            fill;
+  double                              iterationStart;
+  unrestricted double                 iterations;
+  (unrestricted double or DOMString)  duration;
+  PlaybackDirection                   direction;
+  DOMString                           easing;
+};
+
+dictionary ComputedEffectTiming : EffectTiming {
+  unrestricted double   endTime = 0.0;
+  unrestricted double   activeDuration = 0.0;
+  double?               localTime = null;
+  double?               progress = null;
+  unrestricted double?  currentIteration = null;
+};
+
+[Func="nsDocument::IsWebAnimationsEnabled"]
+interface AnimationEffect {
+  EffectTiming getTiming();
+  [BinaryName="getComputedTimingAsDict"]
+  ComputedEffectTiming getComputedTiming();
+  [Throws]
+  void updateTiming(optional OptionalEffectTiming timing);
+};
diff --git a/crates/web-sys/webidls/available/AnimationEvent.webidl b/crates/web-sys/webidls/available/AnimationEvent.webidl
new file mode 100644
index 00000000..e48ed571
--- /dev/null
+++ b/crates/web-sys/webidls/available/AnimationEvent.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/css3-animations/#animation-events-
+ * http://dev.w3.org/csswg/css3-animations/#animation-events-
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Constructor(DOMString type, optional AnimationEventInit eventInitDict)]
+interface AnimationEvent : Event {
+  readonly attribute DOMString animationName;
+  readonly attribute float     elapsedTime;
+  readonly attribute DOMString pseudoElement;
+};
+
+dictionary AnimationEventInit : EventInit {
+  DOMString animationName = "";
+  float elapsedTime = 0;
+  DOMString pseudoElement = "";
+};
diff --git a/crates/web-sys/webidls/available/AnimationPlaybackEvent.webidl b/crates/web-sys/webidls/available/AnimationPlaybackEvent.webidl
new file mode 100644
index 00000000..db8136ea
--- /dev/null
+++ b/crates/web-sys/webidls/available/AnimationPlaybackEvent.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/web-animations/#animationplaybackevent
+ *
+ * Copyright © 2015 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Func="nsDocument::IsWebAnimationsEnabled",
+ Constructor(DOMString type,
+             optional AnimationPlaybackEventInit eventInitDict)]
+interface AnimationPlaybackEvent : Event {
+  readonly attribute double? currentTime;
+  readonly attribute double? timelineTime;
+};
+
+dictionary AnimationPlaybackEventInit : EventInit {
+  double? currentTime = null;
+  double? timelineTime = null;
+};
diff --git a/crates/web-sys/webidls/available/AnimationTimeline.webidl b/crates/web-sys/webidls/available/AnimationTimeline.webidl
new file mode 100644
index 00000000..70126603
--- /dev/null
+++ b/crates/web-sys/webidls/available/AnimationTimeline.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/web-animations/#animationtimeline
+ *
+ * Copyright © 2015 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Func="nsDocument::IsWebAnimationsEnabled"]
+interface AnimationTimeline {
+  [BinaryName="currentTimeAsDouble"]
+  readonly attribute double? currentTime;
+};
diff --git a/crates/web-sys/webidls/available/Attr.webidl b/crates/web-sys/webidls/available/Attr.webidl
new file mode 100644
index 00000000..921e2df8
--- /dev/null
+++ b/crates/web-sys/webidls/available/Attr.webidl
@@ -0,0 +1,33 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/2012/WD-dom-20120105/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface Attr : Node {
+  readonly attribute DOMString localName;
+           [CEReactions, SetterNeedsSubjectPrincipal=NonSystem, SetterThrows]
+           attribute DOMString value;
+
+  [Constant]
+  readonly attribute DOMString name;
+  [Constant]
+  readonly attribute DOMString? namespaceURI;
+  [Constant]
+  readonly attribute DOMString? prefix;
+
+  readonly attribute boolean specified;
+};
+
+// Mozilla extensions
+
+partial interface Attr {
+           [GetterThrows]
+  readonly attribute Element? ownerElement;
+};
diff --git a/crates/web-sys/webidls/available/AudioBuffer.webidl b/crates/web-sys/webidls/available/AudioBuffer.webidl
new file mode 100644
index 00000000..7006b86e
--- /dev/null
+++ b/crates/web-sys/webidls/available/AudioBuffer.webidl
@@ -0,0 +1,38 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary AudioBufferOptions {
+             unsigned long numberOfChannels = 1;
+    required unsigned long length;
+    required float         sampleRate;
+};
+
+[Pref="dom.webaudio.enabled",
+ Constructor(AudioBufferOptions options)]
+interface AudioBuffer {
+
+    readonly attribute float sampleRate;
+    readonly attribute unsigned long length;
+
+    // in seconds 
+    readonly attribute double duration;
+
+    readonly attribute unsigned long numberOfChannels;
+
+    [Throws]
+    Float32Array getChannelData(unsigned long channel);
+
+    [Throws]
+    void copyFromChannel(Float32Array destination, long channelNumber, optional unsigned long startInChannel = 0);
+    [Throws]
+    void copyToChannel(Float32Array source, long channelNumber, optional unsigned long startInChannel = 0);
+};
diff --git a/crates/web-sys/webidls/available/AudioBufferSourceNode.webidl b/crates/web-sys/webidls/available/AudioBufferSourceNode.webidl
new file mode 100644
index 00000000..1c30db3d
--- /dev/null
+++ b/crates/web-sys/webidls/available/AudioBufferSourceNode.webidl
@@ -0,0 +1,41 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary AudioBufferSourceOptions {
+             AudioBuffer? buffer;
+             float        detune = 0;
+             boolean      loop = false;
+             double       loopEnd = 0;
+             double       loopStart = 0;
+             float        playbackRate = 1;
+};
+
+[Pref="dom.webaudio.enabled",
+ Constructor(BaseAudioContext context, optional AudioBufferSourceOptions options)]
+interface AudioBufferSourceNode : AudioScheduledSourceNode {
+
+    attribute AudioBuffer? buffer;
+
+    readonly attribute AudioParam playbackRate;
+    readonly attribute AudioParam detune;
+
+    attribute boolean loop;
+    attribute double loopStart;
+    attribute double loopEnd;
+
+    [Throws]
+    void start(optional double when = 0, optional double grainOffset = 0,
+               optional double grainDuration);
+};
+
+// Mozilla extensions
+AudioBufferSourceNode implements AudioNodePassThrough;
diff --git a/crates/web-sys/webidls/available/AudioContext.webidl b/crates/web-sys/webidls/available/AudioContext.webidl
new file mode 100644
index 00000000..d115b968
--- /dev/null
+++ b/crates/web-sys/webidls/available/AudioContext.webidl
@@ -0,0 +1,39 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary AudioContextOptions {
+             float        sampleRate = 0;
+};
+
+[Pref="dom.webaudio.enabled",
+ Constructor(optional AudioContextOptions contextOptions)]
+interface AudioContext : BaseAudioContext {
+
+    // Bug 1324545: readonly        attribute double outputLatency;
+    // Bug 1324545: AudioTimestamp                  getOutputTimestamp ();
+
+    [Throws]
+    Promise<void> suspend();
+    [Throws]
+    Promise<void> close();
+
+    [NewObject, Throws]
+    MediaElementAudioSourceNode createMediaElementSource(HTMLMediaElement mediaElement);
+
+    [NewObject, Throws]
+    MediaStreamAudioSourceNode createMediaStreamSource(MediaStream mediaStream);
+
+    // Bug 1324548: MediaStreamTrackAudioSourceNode createMediaStreamTrackSource (AudioMediaStreamTrack mediaStreamTrack);
+
+    [NewObject, Throws]
+    MediaStreamAudioDestinationNode createMediaStreamDestination();
+};
diff --git a/crates/web-sys/webidls/available/AudioDestinationNode.webidl b/crates/web-sys/webidls/available/AudioDestinationNode.webidl
new file mode 100644
index 00000000..e5c6db86
--- /dev/null
+++ b/crates/web-sys/webidls/available/AudioDestinationNode.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="dom.webaudio.enabled"]
+interface AudioDestinationNode : AudioNode {
+
+    readonly attribute unsigned long maxChannelCount;
+
+};
+
diff --git a/crates/web-sys/webidls/available/AudioListener.webidl b/crates/web-sys/webidls/available/AudioListener.webidl
new file mode 100644
index 00000000..8970e6b9
--- /dev/null
+++ b/crates/web-sys/webidls/available/AudioListener.webidl
@@ -0,0 +1,31 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="dom.webaudio.enabled"]
+interface AudioListener {
+
+    // same as OpenAL (default 1)
+    [Deprecated="PannerNodeDoppler"]
+    attribute double dopplerFactor;
+
+    // in meters / second (default 343.3)
+    [Deprecated="PannerNodeDoppler"]
+    attribute double speedOfSound;
+
+    // Uses a 3D cartesian coordinate system
+    void setPosition(double x, double y, double z);
+    void setOrientation(double x, double y, double z, double xUp, double yUp, double zUp);
+    [Deprecated="PannerNodeDoppler"]
+    void setVelocity(double x, double y, double z);
+
+};
+
diff --git a/crates/web-sys/webidls/available/AudioNode.webidl b/crates/web-sys/webidls/available/AudioNode.webidl
new file mode 100644
index 00000000..80b33e50
--- /dev/null
+++ b/crates/web-sys/webidls/available/AudioNode.webidl
@@ -0,0 +1,76 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum ChannelCountMode {
+    "max",
+    "clamped-max",
+    "explicit"
+};
+
+enum ChannelInterpretation {
+    "speakers",
+    "discrete"
+};
+
+dictionary AudioNodeOptions {
+             unsigned long         channelCount;
+             ChannelCountMode      channelCountMode;
+             ChannelInterpretation channelInterpretation;
+};
+
+[Pref="dom.webaudio.enabled"]
+interface AudioNode : EventTarget {
+
+    [Throws]
+    AudioNode connect(AudioNode destination, optional unsigned long output = 0, optional unsigned long input = 0);
+    [Throws]
+    void connect(AudioParam destination, optional unsigned long output = 0);
+    [Throws]
+    void disconnect();
+    [Throws]
+    void disconnect(unsigned long output);
+    [Throws]
+    void disconnect(AudioNode destination);
+    [Throws]
+    void disconnect(AudioNode destination, unsigned long output);
+    [Throws]
+    void disconnect(AudioNode destination, unsigned long output, unsigned long input);
+    [Throws]
+    void disconnect(AudioParam destination);
+    [Throws]
+    void disconnect(AudioParam destination, unsigned long output);
+
+    readonly attribute BaseAudioContext context;
+    readonly attribute unsigned long numberOfInputs;
+    readonly attribute unsigned long numberOfOutputs;
+
+    // Channel up-mixing and down-mixing rules for all inputs.
+    [SetterThrows]
+    attribute unsigned long channelCount;
+    [SetterThrows]
+    attribute ChannelCountMode channelCountMode;
+    [SetterThrows]
+    attribute ChannelInterpretation channelInterpretation;
+
+};
+
+// Mozilla extension
+partial interface AudioNode {
+  [ChromeOnly]
+  readonly attribute unsigned long id;
+};
+[NoInterfaceObject]
+interface AudioNodePassThrough {
+  [ChromeOnly]
+  attribute boolean passThrough;
+};
+
diff --git a/crates/web-sys/webidls/available/AudioParam.webidl b/crates/web-sys/webidls/available/AudioParam.webidl
new file mode 100644
index 00000000..7e151b41
--- /dev/null
+++ b/crates/web-sys/webidls/available/AudioParam.webidl
@@ -0,0 +1,52 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="dom.webaudio.enabled"]
+interface AudioParam {
+
+                    attribute float value;
+    readonly        attribute float defaultValue;
+    readonly        attribute float minValue;
+    readonly        attribute float maxValue;
+
+    // Parameter automation. 
+    [Throws]
+    AudioParam setValueAtTime(float value, double startTime);
+    [Throws]
+    AudioParam linearRampToValueAtTime(float value, double endTime);
+    [Throws]
+    AudioParam exponentialRampToValueAtTime(float value, double endTime);
+
+    // Exponentially approach the target value with a rate having the given time constant. 
+    [Throws]
+    AudioParam setTargetAtTime(float target, double startTime, double timeConstant);
+
+    // Sets an array of arbitrary parameter values starting at time for the given duration. 
+    // The number of values will be scaled to fit into the desired duration. 
+    [Throws]
+    AudioParam setValueCurveAtTime(Float32Array values, double startTime, double duration);
+
+    // Cancels all scheduled parameter changes with times greater than or equal to startTime. 
+    [Throws]
+    AudioParam cancelScheduledValues(double startTime);
+
+};
+
+// Mozilla extension
+partial interface AudioParam {
+  // The ID of the AudioNode this AudioParam belongs to.
+  [ChromeOnly]
+  readonly attribute unsigned long parentNodeId;
+  // The name of the AudioParam
+  [ChromeOnly]
+  readonly attribute DOMString name;
+};
diff --git a/crates/web-sys/webidls/available/AudioParamMap.webidl b/crates/web-sys/webidls/available/AudioParamMap.webidl
new file mode 100644
index 00000000..9aabd93d
--- /dev/null
+++ b/crates/web-sys/webidls/available/AudioParamMap.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/#audioparammap
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="dom.audioworklet.enabled"]
+interface AudioParamMap {
+    readonly maplike<DOMString, AudioParam>;
+};
diff --git a/crates/web-sys/webidls/available/AudioProcessingEvent.webidl b/crates/web-sys/webidls/available/AudioProcessingEvent.webidl
new file mode 100644
index 00000000..8cf3d9cc
--- /dev/null
+++ b/crates/web-sys/webidls/available/AudioProcessingEvent.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="dom.webaudio.enabled"]
+interface AudioProcessingEvent : Event {
+
+  readonly attribute double playbackTime;
+
+  [Throws]
+  readonly attribute AudioBuffer inputBuffer;
+  [Throws]
+  readonly attribute AudioBuffer outputBuffer;
+
+};
+
diff --git a/crates/web-sys/webidls/available/AudioScheduledSourceNode.webidl b/crates/web-sys/webidls/available/AudioScheduledSourceNode.webidl
new file mode 100644
index 00000000..2acf6373
--- /dev/null
+++ b/crates/web-sys/webidls/available/AudioScheduledSourceNode.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/#idl-def-AudioScheduledSourceNode
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface AudioScheduledSourceNode : AudioNode {
+                    attribute EventHandler onended;
+    [Throws]
+    void start (optional double when = 0);
+
+    [Throws]
+    void stop (optional double when = 0);
+};
diff --git a/crates/web-sys/webidls/available/AudioStreamTrack.webidl b/crates/web-sys/webidls/available/AudioStreamTrack.webidl
new file mode 100644
index 00000000..9fff71ce
--- /dev/null
+++ b/crates/web-sys/webidls/available/AudioStreamTrack.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2011/webrtc/editor/getusermedia.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+// [Constructor(optional MediaTrackConstraints audioConstraints)]
+interface AudioStreamTrack : MediaStreamTrack {
+//    static sequence<DOMString> getSourceIds ();
+};
diff --git a/crates/web-sys/webidls/available/AudioTrack.webidl b/crates/web-sys/webidls/available/AudioTrack.webidl
new file mode 100644
index 00000000..e70456a3
--- /dev/null
+++ b/crates/web-sys/webidls/available/AudioTrack.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#audiotrack
+ */
+
+[Pref="media.track.enabled"]
+interface AudioTrack {
+  readonly attribute DOMString id;
+  readonly attribute DOMString kind;
+  readonly attribute DOMString label;
+  readonly attribute DOMString language;
+           attribute boolean enabled;
+};
diff --git a/crates/web-sys/webidls/available/AudioTrackList.webidl b/crates/web-sys/webidls/available/AudioTrackList.webidl
new file mode 100644
index 00000000..2c229a67
--- /dev/null
+++ b/crates/web-sys/webidls/available/AudioTrackList.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#audiotracklist
+ */
+
+[Pref="media.track.enabled"]
+interface AudioTrackList : EventTarget {
+  readonly attribute unsigned long length;
+  getter AudioTrack (unsigned long index);
+  AudioTrack? getTrackById(DOMString id);
+
+           attribute EventHandler onchange;
+           attribute EventHandler onaddtrack;
+           attribute EventHandler onremovetrack;
+};
diff --git a/crates/web-sys/webidls/available/AudioWorklet.webidl b/crates/web-sys/webidls/available/AudioWorklet.webidl
new file mode 100644
index 00000000..720cd03c
--- /dev/null
+++ b/crates/web-sys/webidls/available/AudioWorklet.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2018 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window, SecureContext, Pref="dom.audioworklet.enabled"]
+interface AudioWorklet : Worklet {
+};
\ No newline at end of file
diff --git a/crates/web-sys/webidls/available/AudioWorkletGlobalScope.webidl b/crates/web-sys/webidls/available/AudioWorkletGlobalScope.webidl
new file mode 100644
index 00000000..a2b860e3
--- /dev/null
+++ b/crates/web-sys/webidls/available/AudioWorkletGlobalScope.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/#audioworkletglobalscope
+ */
+
+[Global=(Worklet,AudioWorklet),Exposed=AudioWorklet]
+interface AudioWorkletGlobalScope : WorkletGlobalScope {
+    void registerProcessor (DOMString name, VoidFunction processorCtor);
+    readonly  attribute   unsigned long long currentFrame;
+    readonly  attribute   double currentTime;
+    readonly  attribute   float sampleRate;
+};
diff --git a/crates/web-sys/webidls/available/AudioWorkletNode.webidl b/crates/web-sys/webidls/available/AudioWorkletNode.webidl
new file mode 100644
index 00000000..fedb9449
--- /dev/null
+++ b/crates/web-sys/webidls/available/AudioWorkletNode.webidl
@@ -0,0 +1,29 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary AudioWorkletNodeOptions : AudioNodeOptions {
+             unsigned long             numberOfInputs = 1;
+             unsigned long             numberOfOutputs = 1;
+             sequence<unsigned long>   outputChannelCount;
+             record<DOMString, double> parameterData;
+             object?                   processorOptions = null;
+};
+
+[SecureContext, Pref="dom.audioworklet.enabled",
+ Constructor (BaseAudioContext context, DOMString name, optional AudioWorkletNodeOptions options)]
+interface AudioWorkletNode : AudioNode {
+    [Throws]
+    readonly        attribute AudioParamMap              parameters;
+    [Throws]
+    readonly        attribute MessagePort                port;
+                    attribute EventHandler               onprocessorerror;
+};
diff --git a/crates/web-sys/webidls/available/AudioWorkletProcessor.webidl b/crates/web-sys/webidls/available/AudioWorkletProcessor.webidl
new file mode 100644
index 00000000..01ef6cbc
--- /dev/null
+++ b/crates/web-sys/webidls/available/AudioWorkletProcessor.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/#audioworkletprocessor
+ *
+ * Copyright © 2018 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=AudioWorklet,
+ Constructor (optional AudioWorkletNodeOptions options)]
+interface AudioWorkletProcessor {
+    [Throws]
+    readonly attribute MessagePort port;
+};
diff --git a/crates/web-sys/webidls/available/AutocompleteInfo.webidl b/crates/web-sys/webidls/available/AutocompleteInfo.webidl
new file mode 100644
index 00000000..ad32ff6d
--- /dev/null
+++ b/crates/web-sys/webidls/available/AutocompleteInfo.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/**
+ * This dictionary is used for the input, textarea and select element's
+ * getAutocompleteInfo method.
+ */
+
+dictionary AutocompleteInfo {
+  DOMString section = "";
+  DOMString addressType = "";
+  DOMString contactType = "";
+  DOMString fieldName = "";
+};
diff --git a/crates/web-sys/webidls/available/BarProp.webidl b/crates/web-sys/webidls/available/BarProp.webidl
new file mode 100644
index 00000000..871f0793
--- /dev/null
+++ b/crates/web-sys/webidls/available/BarProp.webidl
@@ -0,0 +1,11 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+interface BarProp
+{
+  [Throws, NeedsCallerType]
+           attribute boolean visible;
+};
diff --git a/crates/web-sys/webidls/available/BaseAudioContext.webidl b/crates/web-sys/webidls/available/BaseAudioContext.webidl
new file mode 100644
index 00000000..e8796bb9
--- /dev/null
+++ b/crates/web-sys/webidls/available/BaseAudioContext.webidl
@@ -0,0 +1,102 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/#idl-def-BaseAudioContext
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+callback DecodeSuccessCallback = void (AudioBuffer decodedData);
+callback DecodeErrorCallback = void (DOMException error);
+
+enum AudioContextState {
+    "suspended",
+    "running",
+    "closed"
+};
+
+interface BaseAudioContext : EventTarget {
+    readonly        attribute AudioDestinationNode destination;
+    readonly        attribute float                sampleRate;
+    readonly        attribute double               currentTime;
+    readonly        attribute AudioListener        listener;
+    readonly        attribute AudioContextState    state;
+    [Throws, SameObject, SecureContext, Pref="dom.audioworklet.enabled"]
+    readonly        attribute AudioWorklet         audioWorklet;
+    // Bug 1324552: readonly        attribute double               baseLatency;
+
+    [Throws]
+    Promise<void> resume();
+
+                    attribute EventHandler         onstatechange;
+
+    [NewObject, Throws]
+    AudioBuffer            createBuffer (unsigned long numberOfChannels,
+                                         unsigned long length,
+                                         float sampleRate);
+
+    [Throws]
+    Promise<AudioBuffer> decodeAudioData(ArrayBuffer audioData,
+                                         optional DecodeSuccessCallback successCallback,
+                                         optional DecodeErrorCallback errorCallback);
+
+    // AudioNode creation
+    [NewObject, Throws]
+    AudioBufferSourceNode createBufferSource();
+
+    [NewObject, Throws]
+    ConstantSourceNode createConstantSource();
+
+    [NewObject, Throws]
+    ScriptProcessorNode createScriptProcessor(optional unsigned long bufferSize = 0,
+                                              optional unsigned long numberOfInputChannels = 2,
+                                              optional unsigned long numberOfOutputChannels = 2);
+
+    [NewObject, Throws]
+    AnalyserNode createAnalyser();
+
+    [NewObject, Throws]
+    GainNode createGain();
+
+    [NewObject, Throws]
+    DelayNode createDelay(optional double maxDelayTime = 1); // TODO: no = 1
+
+    [NewObject, Throws]
+    BiquadFilterNode createBiquadFilter();
+
+    [NewObject, Throws]
+    IIRFilterNode createIIRFilter(sequence<double> feedforward, sequence<double> feedback);
+
+    [NewObject, Throws]
+    WaveShaperNode createWaveShaper();
+
+    [NewObject, Throws]
+    PannerNode createPanner();
+
+    [NewObject, Throws]
+    StereoPannerNode createStereoPanner();
+
+    [NewObject, Throws]
+    ConvolverNode createConvolver();
+
+    [NewObject, Throws]
+    ChannelSplitterNode createChannelSplitter(optional unsigned long numberOfOutputs = 6);
+
+    [NewObject, Throws]
+    ChannelMergerNode createChannelMerger(optional unsigned long numberOfInputs = 6);
+
+    [NewObject, Throws]
+    DynamicsCompressorNode createDynamicsCompressor();
+
+    [NewObject, Throws]
+    OscillatorNode createOscillator();
+
+    [NewObject, Throws]
+    PeriodicWave createPeriodicWave(Float32Array real,
+                                    Float32Array imag,
+                                    optional PeriodicWaveConstraints constraints);
+};
diff --git a/crates/web-sys/webidls/available/BaseKeyframeTypes.webidl b/crates/web-sys/webidls/available/BaseKeyframeTypes.webidl
new file mode 100644
index 00000000..2cbfc4ba
--- /dev/null
+++ b/crates/web-sys/webidls/available/BaseKeyframeTypes.webidl
@@ -0,0 +1,49 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/web-animations/#the-compositeoperation-enumeration
+ * https://drafts.csswg.org/web-animations/#dictdef-basepropertyindexedkeyframe
+ * https://drafts.csswg.org/web-animations/#dictdef-basekeyframe
+ * https://drafts.csswg.org/web-animations/#dictdef-basecomputedkeyframe
+ *
+ * Copyright © 2016 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum CompositeOperation { "replace", "add", "accumulate" };
+
+// The following dictionary types are not referred to by other .webidl files,
+// but we use it for manual JS->IDL and IDL->JS conversions in KeyframeEffect's
+// implementation.
+
+dictionary BasePropertyIndexedKeyframe {
+  (double? or sequence<double?>) offset = [];
+  (DOMString or sequence<DOMString>) easing = [];
+  (CompositeOperation? or sequence<CompositeOperation?>) composite = [];
+};
+
+dictionary BaseKeyframe {
+  double? offset = null;
+  DOMString easing = "linear";
+  CompositeOperation? composite = null;
+
+  // Non-standard extensions
+
+  // Member to allow testing when StyleAnimationValue::ComputeValues fails.
+  //
+  // Note that we currently only apply this to shorthand properties since
+  // it's easier to annotate shorthand property values and because we have
+  // only ever observed ComputeValues failing on shorthand values.
+  //
+  // Bug 1216844 should remove this member since after that bug is fixed we will
+  // have a well-defined behavior to use when animation endpoints are not
+  // available.
+  [ChromeOnly] boolean simulateComputeValuesFailure = false;
+};
+
+dictionary BaseComputedKeyframe : BaseKeyframe {
+  double computedOffset;
+};
diff --git a/crates/web-sys/webidls/available/BasicCardPayment.webidl b/crates/web-sys/webidls/available/BasicCardPayment.webidl
new file mode 100644
index 00000000..3cd62a43
--- /dev/null
+++ b/crates/web-sys/webidls/available/BasicCardPayment.webidl
@@ -0,0 +1,27 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this WebIDL file is
+ *   https://www.w3.org/TR/payment-request/#paymentrequest-interface
+ */
+enum BasicCardType {
+  "credit",
+  "debit",
+  "prepaid"
+};
+
+dictionary BasicCardRequest {
+  sequence<DOMString> supportedNetworks;
+  sequence<BasicCardType> supportedTypes;
+};
+
+dictionary BasicCardResponse {
+           DOMString cardholderName;
+  required DOMString cardNumber;
+           DOMString expiryMonth;
+           DOMString expiryYear;
+           DOMString cardSecurityCode;
+           PaymentAddress? billingAddress;
+};
diff --git a/crates/web-sys/webidls/available/BatteryManager.webidl b/crates/web-sys/webidls/available/BatteryManager.webidl
new file mode 100644
index 00000000..a964f3b0
--- /dev/null
+++ b/crates/web-sys/webidls/available/BatteryManager.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/battery-status/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface BatteryManager : EventTarget {
+    readonly attribute boolean             charging;
+    readonly attribute unrestricted double chargingTime;
+    readonly attribute unrestricted double dischargingTime;
+    readonly attribute double              level;
+
+             attribute EventHandler        onchargingchange;
+             attribute EventHandler        onchargingtimechange;
+             attribute EventHandler        ondischargingtimechange;
+             attribute EventHandler        onlevelchange;
+};
diff --git a/crates/web-sys/webidls/available/BeforeUnloadEvent.webidl b/crates/web-sys/webidls/available/BeforeUnloadEvent.webidl
new file mode 100644
index 00000000..e64e1b2c
--- /dev/null
+++ b/crates/web-sys/webidls/available/BeforeUnloadEvent.webidl
@@ -0,0 +1,12 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface, please see
+ * http://www.whatwg.org/specs/web-apps/current-work/#beforeunloadevent
+ */
+
+interface BeforeUnloadEvent : Event {
+  attribute DOMString returnValue;
+};
diff --git a/crates/web-sys/webidls/available/BiquadFilterNode.webidl b/crates/web-sys/webidls/available/BiquadFilterNode.webidl
new file mode 100644
index 00000000..c9ac0f0b
--- /dev/null
+++ b/crates/web-sys/webidls/available/BiquadFilterNode.webidl
@@ -0,0 +1,50 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum BiquadFilterType {
+  "lowpass",
+  "highpass",
+  "bandpass",
+  "lowshelf",
+  "highshelf",
+  "peaking",
+  "notch",
+  "allpass"
+};
+
+dictionary BiquadFilterOptions : AudioNodeOptions {
+             BiquadFilterType type = "lowpass";
+             float            Q = 1;
+             float            detune = 0;
+             float            frequency = 350;
+             float            gain = 0;
+};
+
+[Pref="dom.webaudio.enabled",
+ Constructor(BaseAudioContext context, optional BiquadFilterOptions options)]
+interface BiquadFilterNode : AudioNode {
+
+    attribute BiquadFilterType type;
+    readonly attribute AudioParam frequency; // in Hertz
+    readonly attribute AudioParam detune; // in Cents
+    readonly attribute AudioParam Q; // Quality factor
+    readonly attribute AudioParam gain; // in Decibels
+
+    void getFrequencyResponse(Float32Array frequencyHz,
+                              Float32Array magResponse,
+                              Float32Array phaseResponse);
+
+};
+
+// Mozilla extension
+BiquadFilterNode implements AudioNodePassThrough;
+
diff --git a/crates/web-sys/webidls/available/Blob.webidl b/crates/web-sys/webidls/available/Blob.webidl
new file mode 100644
index 00000000..94812cd8
--- /dev/null
+++ b/crates/web-sys/webidls/available/Blob.webidl
@@ -0,0 +1,38 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/FileAPI/#blob
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+typedef (BufferSource or Blob or USVString) BlobPart;
+
+[Constructor(optional sequence<BlobPart> blobParts,
+             optional BlobPropertyBag options),
+ Exposed=(Window,Worker)]
+interface Blob {
+
+  [GetterThrows]
+  readonly attribute unsigned long long size;
+
+  readonly attribute DOMString type;
+
+  //slice Blob into byte-ranged chunks
+
+  [Throws]
+  Blob slice([Clamp] optional long long start,
+             [Clamp] optional long long end,
+             optional DOMString contentType);
+};
+
+enum EndingTypes { "transparent", "native" };
+
+dictionary BlobPropertyBag {
+  DOMString type = "";
+  EndingTypes endings = "transparent";
+};
diff --git a/crates/web-sys/webidls/available/BlobEvent.webidl b/crates/web-sys/webidls/available/BlobEvent.webidl
new file mode 100644
index 00000000..8d041870
--- /dev/null
+++ b/crates/web-sys/webidls/available/BlobEvent.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Constructor(DOMString type, optional BlobEventInit eventInitDict)]
+interface BlobEvent : Event
+{
+  readonly attribute Blob? data;
+};
+
+dictionary BlobEventInit : EventInit
+{
+  Blob? data = null;
+};
diff --git a/crates/web-sys/webidls/available/BoxObject.webidl b/crates/web-sys/webidls/available/BoxObject.webidl
new file mode 100644
index 00000000..8bebd6c9
--- /dev/null
+++ b/crates/web-sys/webidls/available/BoxObject.webidl
@@ -0,0 +1,33 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Func="IsChromeOrXBL"]
+interface BoxObject {
+  readonly attribute Element? element;
+
+  readonly attribute long x;
+  readonly attribute long y;
+  [Throws]
+  readonly attribute long screenX;
+  [Throws]
+  readonly attribute long screenY;
+  readonly attribute long width;
+  readonly attribute long height;
+
+  nsISupports? getPropertyAsSupports(DOMString propertyName);
+  void setPropertyAsSupports(DOMString propertyName, nsISupports value);
+  [Throws]
+  DOMString? getProperty(DOMString propertyName);
+  void setProperty(DOMString propertyName, DOMString propertyValue);
+  void removeProperty(DOMString propertyName);
+
+  // for stepping through content in the expanded dom with box-ordinal-group order
+  readonly attribute Element? parentBox;
+  readonly attribute Element? firstChild;
+  readonly attribute Element? lastChild;
+  readonly attribute Element? nextSibling;
+  readonly attribute Element? previousSibling;
+};
diff --git a/crates/web-sys/webidls/available/BroadcastChannel.webidl b/crates/web-sys/webidls/available/BroadcastChannel.webidl
new file mode 100644
index 00000000..fb0b639f
--- /dev/null
+++ b/crates/web-sys/webidls/available/BroadcastChannel.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface, please see
+ * https://html.spec.whatwg.org/#broadcastchannel
+ */
+
+[Constructor(DOMString channel),
+ Exposed=(Window,Worker)]
+interface BroadcastChannel : EventTarget {
+  readonly attribute DOMString name;
+
+  [Throws]
+  void postMessage(any message);
+
+  void close();
+
+  attribute EventHandler onmessage;
+  attribute EventHandler onmessageerror;
+};
diff --git a/crates/web-sys/webidls/available/BrowserElement.webidl b/crates/web-sys/webidls/available/BrowserElement.webidl
new file mode 100644
index 00000000..8a683d94
--- /dev/null
+++ b/crates/web-sys/webidls/available/BrowserElement.webidl
@@ -0,0 +1,153 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+callback BrowserElementNextPaintEventCallback = void ();
+
+enum BrowserFindCaseSensitivity { "case-sensitive", "case-insensitive" };
+enum BrowserFindDirection { "forward", "backward" };
+
+dictionary BrowserElementDownloadOptions {
+  DOMString? filename;
+  DOMString? referrer;
+};
+
+dictionary BrowserElementExecuteScriptOptions {
+  DOMString? url;
+  DOMString? origin;
+};
+
+[NoInterfaceObject]
+interface BrowserElement {
+};
+
+BrowserElement implements BrowserElementCommon;
+BrowserElement implements BrowserElementPrivileged;
+
+[NoInterfaceObject]
+interface BrowserElementCommon {
+  [Throws,
+   Pref="dom.mozBrowserFramesEnabled",
+   ChromeOnly]
+  void addNextPaintListener(BrowserElementNextPaintEventCallback listener);
+
+  [Throws,
+   Pref="dom.mozBrowserFramesEnabled",
+   ChromeOnly]
+  void removeNextPaintListener(BrowserElementNextPaintEventCallback listener);
+};
+
+[NoInterfaceObject]
+interface BrowserElementPrivileged {
+  [Throws,
+   Pref="dom.mozBrowserFramesEnabled",
+   ChromeOnly]
+  void sendMouseEvent(DOMString type,
+                      unsigned long x,
+                      unsigned long y,
+                      unsigned long button,
+                      unsigned long clickCount,
+                      unsigned long modifiers);
+
+  [Throws,
+   Pref="dom.mozBrowserFramesEnabled",
+   Func="TouchEvent::PrefEnabled",
+   ChromeOnly]
+  void sendTouchEvent(DOMString type,
+                      sequence<unsigned long> identifiers,
+                      sequence<long> x,
+                      sequence<long> y,
+                      sequence<unsigned long> rx,
+                      sequence<unsigned long> ry,
+                      sequence<float> rotationAngles,
+                      sequence<float> forces,
+                      unsigned long count,
+                      unsigned long modifiers);
+
+  [Throws,
+   Pref="dom.mozBrowserFramesEnabled",
+   ChromeOnly]
+  void goBack();
+
+  [Throws,
+   Pref="dom.mozBrowserFramesEnabled",
+   ChromeOnly]
+  void goForward();
+
+  [Throws,
+   Pref="dom.mozBrowserFramesEnabled",
+   ChromeOnly]
+  void reload(optional boolean hardReload = false);
+
+  [Throws,
+   Pref="dom.mozBrowserFramesEnabled",
+   ChromeOnly]
+  void stop();
+
+  [Throws,
+   Pref="dom.mozBrowserFramesEnabled",
+   ChromeOnly]
+  DOMRequest download(DOMString url,
+                      optional BrowserElementDownloadOptions options);
+
+  [Throws,
+   Pref="dom.mozBrowserFramesEnabled",
+   ChromeOnly]
+  DOMRequest purgeHistory();
+
+  [Throws,
+   Pref="dom.mozBrowserFramesEnabled",
+   ChromeOnly]
+  DOMRequest getScreenshot([EnforceRange] unsigned long width,
+                           [EnforceRange] unsigned long height,
+                           optional DOMString mimeType="");
+
+  [Throws,
+   Pref="dom.mozBrowserFramesEnabled",
+   ChromeOnly]
+  void zoom(float zoom);
+
+  [Throws,
+   Pref="dom.mozBrowserFramesEnabled",
+   ChromeOnly]
+  DOMRequest getCanGoBack();
+
+  [Throws,
+   Pref="dom.mozBrowserFramesEnabled",
+   ChromeOnly]
+  DOMRequest getCanGoForward();
+
+  [Throws,
+   Pref="dom.mozBrowserFramesEnabled",
+   ChromeOnly]
+  DOMRequest getContentDimensions();
+
+  [Throws,
+   Pref="dom.mozBrowserFramesEnabled",
+   ChromeOnly]
+  void findAll(DOMString searchString, BrowserFindCaseSensitivity caseSensitivity);
+
+  [Throws,
+   Pref="dom.mozBrowserFramesEnabled",
+   ChromeOnly]
+  void findNext(BrowserFindDirection direction);
+
+  [Throws,
+   Pref="dom.mozBrowserFramesEnabled",
+   ChromeOnly]
+  void clearMatch();
+
+  [Throws,
+   Pref="dom.mozBrowserFramesEnabled",
+   ChromeOnly]
+  DOMRequest executeScript(DOMString script,
+                           optional BrowserElementExecuteScriptOptions options);
+
+  [Throws,
+   Pref="dom.mozBrowserFramesEnabled",
+   ChromeOnly]
+  DOMRequest getWebManifest();
+
+};
diff --git a/crates/web-sys/webidls/available/BrowserElementDictionaries.webidl b/crates/web-sys/webidls/available/BrowserElementDictionaries.webidl
new file mode 100644
index 00000000..400e4025
--- /dev/null
+++ b/crates/web-sys/webidls/available/BrowserElementDictionaries.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary OpenWindowEventDetail {
+  DOMString url = "";
+  DOMString name = "";
+  DOMString features = "";
+  Node? frameElement = null;
+};
+
+dictionary DOMWindowResizeEventDetail {
+  long width = 0;
+  long height = 0;
+};
diff --git a/crates/web-sys/webidls/available/BrowserFeedWriter.webidl b/crates/web-sys/webidls/available/BrowserFeedWriter.webidl
new file mode 100644
index 00000000..d756a883
--- /dev/null
+++ b/crates/web-sys/webidls/available/BrowserFeedWriter.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[JSImplementation="@mozilla.org/browser/feeds/result-writer;1",
+ Func="mozilla::FeedWriterEnabled::IsEnabled",
+ Constructor]
+interface BrowserFeedWriter {
+  /**
+   * Writes the feed content, assumes that the feed writer is initialized.
+   */
+  void writeContent();
+
+  /**
+   * Uninitialize the feed writer.
+   */
+  void close();
+};
diff --git a/crates/web-sys/webidls/available/CDATASection.webidl b/crates/web-sys/webidls/available/CDATASection.webidl
new file mode 100644
index 00000000..895dae08
--- /dev/null
+++ b/crates/web-sys/webidls/available/CDATASection.webidl
@@ -0,0 +1,8 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+interface CDATASection : Text {
+};
diff --git a/crates/web-sys/webidls/available/CSPDictionaries.webidl b/crates/web-sys/webidls/available/CSPDictionaries.webidl
new file mode 100644
index 00000000..f8de1c9a
--- /dev/null
+++ b/crates/web-sys/webidls/available/CSPDictionaries.webidl
@@ -0,0 +1,38 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+  * Dictionary used to display CSP info.
+  */
+
+dictionary CSP {
+  boolean report-only = false;
+
+  sequence<DOMString> default-src;
+  sequence<DOMString> script-src;
+  sequence<DOMString> object-src;
+  sequence<DOMString> style-src;
+  sequence<DOMString> img-src;
+  sequence<DOMString> media-src;
+  sequence<DOMString> frame-src;
+  sequence<DOMString> font-src;
+  sequence<DOMString> connect-src;
+  sequence<DOMString> report-uri;
+  sequence<DOMString> frame-ancestors;
+  // sequence<DOMString> reflected-xss; // not supported in Firefox
+  sequence<DOMString> base-uri;
+  sequence<DOMString> form-action;
+  sequence<DOMString> referrer;
+  sequence<DOMString> manifest-src;
+  sequence<DOMString> upgrade-insecure-requests;
+  sequence<DOMString> child-src;
+  sequence<DOMString> block-all-mixed-content;
+  sequence<DOMString> require-sri-for;
+  sequence<DOMString> sandbox;
+  sequence<DOMString> worker-src;
+};
+
+dictionary CSPPolicies {
+  sequence<CSP> csp-policies;
+};
diff --git a/crates/web-sys/webidls/available/CSPReport.webidl b/crates/web-sys/webidls/available/CSPReport.webidl
new file mode 100644
index 00000000..301ca288
--- /dev/null
+++ b/crates/web-sys/webidls/available/CSPReport.webidl
@@ -0,0 +1,24 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+  * This dictionary holds the parameters used to send
+  * CSP reports in JSON format.
+  */
+
+dictionary CSPReportProperties {
+  DOMString document-uri = "";
+  DOMString referrer = "";
+  DOMString blocked-uri = "";
+  DOMString violated-directive = "";
+  DOMString original-policy= "";
+  DOMString source-file;
+  DOMString script-sample;
+  long line-number;
+  long column-number;
+};
+
+dictionary CSPReport {
+  CSPReportProperties csp-report;
+};
diff --git a/crates/web-sys/webidls/available/CSS.webidl b/crates/web-sys/webidls/available/CSS.webidl
new file mode 100644
index 00000000..ad3f9a42
--- /dev/null
+++ b/crates/web-sys/webidls/available/CSS.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/csswg/css3-conditional/
+ * http://dev.w3.org/csswg/cssom/#the-css.escape%28%29-method
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+namespace CSS {
+  [Throws]
+  boolean supports(DOMString property, DOMString value);
+
+  [Throws]
+  boolean supports(DOMString conditionText);
+};
+
+// http://dev.w3.org/csswg/cssom/#the-css.escape%28%29-method
+partial namespace CSS {
+  DOMString escape(DOMString ident);
+};
diff --git a/crates/web-sys/webidls/available/CSSAnimation.webidl b/crates/web-sys/webidls/available/CSSAnimation.webidl
new file mode 100644
index 00000000..8799bfad
--- /dev/null
+++ b/crates/web-sys/webidls/available/CSSAnimation.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/csswg/css-animations-2/#the-CSSAnimation-interface
+ *
+ * Copyright © 2015 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Func="nsDocument::IsWebAnimationsEnabled",
+ HeaderFile="nsAnimationManager.h"]
+interface CSSAnimation : Animation {
+  [Constant] readonly attribute DOMString animationName;
+};
diff --git a/crates/web-sys/webidls/available/CSSConditionRule.webidl b/crates/web-sys/webidls/available/CSSConditionRule.webidl
new file mode 100644
index 00000000..24fae234
--- /dev/null
+++ b/crates/web-sys/webidls/available/CSSConditionRule.webidl
@@ -0,0 +1,14 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/css-conditional/#the-cssconditionrule-interface
+ */
+
+// https://drafts.csswg.org/css-conditional/#the-cssconditionrule-interface
+interface CSSConditionRule : CSSGroupingRule {
+  [SetterThrows]
+  attribute DOMString conditionText;
+};
diff --git a/crates/web-sys/webidls/available/CSSCounterStyleRule.webidl b/crates/web-sys/webidls/available/CSSCounterStyleRule.webidl
new file mode 100644
index 00000000..bb6f7e0e
--- /dev/null
+++ b/crates/web-sys/webidls/available/CSSCounterStyleRule.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/css-counter-styles-3/#the-csscounterstylerule-interface
+ */
+
+// https://drafts.csswg.org/css-counter-styles-3/#the-csscounterstylerule-interface
+interface CSSCounterStyleRule : CSSRule {
+  attribute DOMString name;
+  attribute DOMString system;
+  attribute DOMString symbols;
+  attribute DOMString additiveSymbols;
+  attribute DOMString negative;
+  attribute DOMString prefix;
+  attribute DOMString suffix;
+  attribute DOMString range;
+  attribute DOMString pad;
+  attribute DOMString speakAs;
+  attribute DOMString fallback;
+};
diff --git a/crates/web-sys/webidls/available/CSSFontFaceRule.webidl b/crates/web-sys/webidls/available/CSSFontFaceRule.webidl
new file mode 100644
index 00000000..221dd26a
--- /dev/null
+++ b/crates/web-sys/webidls/available/CSSFontFaceRule.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/css-fonts/#om-fontface
+ */
+
+// https://drafts.csswg.org/css-fonts/#om-fontface
+// But we implement a very old draft, apparently....
+// See bug 1058408 for implementing the current spec.
+interface CSSFontFaceRule : CSSRule {
+  [SameObject] readonly attribute CSSStyleDeclaration style;
+};
diff --git a/crates/web-sys/webidls/available/CSSFontFeatureValuesRule.webidl b/crates/web-sys/webidls/available/CSSFontFeatureValuesRule.webidl
new file mode 100644
index 00000000..75329381
--- /dev/null
+++ b/crates/web-sys/webidls/available/CSSFontFeatureValuesRule.webidl
@@ -0,0 +1,29 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/css-fonts/#om-fontfeaturevalues
+ */
+
+// https://drafts.csswg.org/css-fonts/#om-fontfeaturevalues
+// but we don't implement anything remotely resembling the spec.
+interface CSSFontFeatureValuesRule : CSSRule {
+  [SetterThrows]
+  attribute DOMString fontFamily;
+
+  // Not yet implemented
+  //  readonly attribute CSSFontFeatureValuesMap annotation;
+  //  readonly attribute CSSFontFeatureValuesMap ornaments;
+  //  readonly attribute CSSFontFeatureValuesMap stylistic;
+  //  readonly attribute CSSFontFeatureValuesMap swash;
+  //  readonly attribute CSSFontFeatureValuesMap characterVariant;
+  //  readonly attribute CSSFontFeatureValuesMap styleset;
+};
+
+partial interface CSSFontFeatureValuesRule {
+  // Gecko addition?
+  [SetterThrows]
+  attribute DOMString valueText;
+};
diff --git a/crates/web-sys/webidls/available/CSSGroupingRule.webidl b/crates/web-sys/webidls/available/CSSGroupingRule.webidl
new file mode 100644
index 00000000..93a221fb
--- /dev/null
+++ b/crates/web-sys/webidls/available/CSSGroupingRule.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/cssom/#cssgroupingrule
+ */
+
+// https://drafts.csswg.org/cssom/#cssgroupingrule
+interface CSSGroupingRule : CSSRule {
+  [SameObject] readonly attribute CSSRuleList cssRules;
+  [Throws]
+  unsigned long insertRule(DOMString rule, optional unsigned long index = 0);
+  [Throws]
+  void deleteRule(unsigned long index);
+};
diff --git a/crates/web-sys/webidls/available/CSSImportRule.webidl b/crates/web-sys/webidls/available/CSSImportRule.webidl
new file mode 100644
index 00000000..fccb9714
--- /dev/null
+++ b/crates/web-sys/webidls/available/CSSImportRule.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/cssom/#cssimportrule
+ */
+
+// https://drafts.csswg.org/cssom/#cssimportrule
+interface CSSImportRule : CSSRule {
+  readonly attribute DOMString href;
+  // Per spec, the .media is never null, but in our implementation it can
+  // be since stylesheet can be null, and in Stylo, media is derived from
+  // the stylesheet.  See <https://bugzilla.mozilla.org/show_bug.cgi?id=1326509>.
+  [SameObject, PutForwards=mediaText] readonly attribute MediaList? media;
+  // Per spec, the .styleSheet is never null, but in our implementation it can
+  // be.  See <https://bugzilla.mozilla.org/show_bug.cgi?id=1326509>.
+  [SameObject] readonly attribute CSSStyleSheet? styleSheet;
+};
diff --git a/crates/web-sys/webidls/available/CSSKeyframeRule.webidl b/crates/web-sys/webidls/available/CSSKeyframeRule.webidl
new file mode 100644
index 00000000..25d8965f
--- /dev/null
+++ b/crates/web-sys/webidls/available/CSSKeyframeRule.webidl
@@ -0,0 +1,14 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/css-animations/#interface-csskeyframerule
+ */
+
+// https://drafts.csswg.org/css-animations/#interface-csskeyframerule
+interface CSSKeyframeRule : CSSRule {
+           attribute DOMString           keyText;
+  readonly attribute CSSStyleDeclaration style;
+};
diff --git a/crates/web-sys/webidls/available/CSSKeyframesRule.webidl b/crates/web-sys/webidls/available/CSSKeyframesRule.webidl
new file mode 100644
index 00000000..d0ea978d
--- /dev/null
+++ b/crates/web-sys/webidls/available/CSSKeyframesRule.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/css-animations/#interface-csskeyframesrule
+ */
+
+// https://drafts.csswg.org/css-animations/#interface-csskeyframesrule
+interface CSSKeyframesRule : CSSRule {
+           attribute DOMString   name;
+  readonly attribute CSSRuleList cssRules;
+
+  void            appendRule(DOMString rule);
+  void            deleteRule(DOMString select);
+  CSSKeyframeRule? findRule(DOMString select);
+};
diff --git a/crates/web-sys/webidls/available/CSSMediaRule.webidl b/crates/web-sys/webidls/available/CSSMediaRule.webidl
new file mode 100644
index 00000000..841a1b6f
--- /dev/null
+++ b/crates/web-sys/webidls/available/CSSMediaRule.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/cssom/#the-cssmediarule-interface
+ * https://drafts.csswg.org/css-conditional/#the-cssmediarule-interface
+ */
+
+// https://drafts.csswg.org/cssom/#the-cssmediarule-interface and
+// https://drafts.csswg.org/css-conditional/#the-cssmediarule-interface
+// except they disagree with each other.  We're taking the inheritance from
+// css-conditional and the PutForwards behavior from cssom.
+interface CSSMediaRule : CSSConditionRule {
+  [SameObject, PutForwards=mediaText] readonly attribute MediaList media;
+};
diff --git a/crates/web-sys/webidls/available/CSSMozDocumentRule.webidl b/crates/web-sys/webidls/available/CSSMozDocumentRule.webidl
new file mode 100644
index 00000000..27a22d52
--- /dev/null
+++ b/crates/web-sys/webidls/available/CSSMozDocumentRule.webidl
@@ -0,0 +1,10 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+// This is a non-standard interface for @-moz-document rules
+interface CSSMozDocumentRule : CSSConditionRule {
+  // XXX Add access to the URL list.
+};
diff --git a/crates/web-sys/webidls/available/CSSNamespaceRule.webidl b/crates/web-sys/webidls/available/CSSNamespaceRule.webidl
new file mode 100644
index 00000000..63f93017
--- /dev/null
+++ b/crates/web-sys/webidls/available/CSSNamespaceRule.webidl
@@ -0,0 +1,14 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/cssom/#cssnamespacerule
+ */
+
+// https://drafts.csswg.org/cssom/#cssnamespacerule
+interface CSSNamespaceRule : CSSRule {
+  readonly attribute DOMString namespaceURI;
+  readonly attribute DOMString prefix;
+};
diff --git a/crates/web-sys/webidls/available/CSSPageRule.webidl b/crates/web-sys/webidls/available/CSSPageRule.webidl
new file mode 100644
index 00000000..93e47ef0
--- /dev/null
+++ b/crates/web-sys/webidls/available/CSSPageRule.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/cssom/#the-csspagerule-interface
+ */
+
+// https://drafts.csswg.org/cssom/#the-csspagerule-interface
+// Per spec, this should inherit from CSSGroupingRule, but we don't
+// implement this yet.
+interface CSSPageRule : CSSRule {
+  // selectorText not implemented yet
+  //         attribute DOMString selectorText;
+  [SameObject, PutForwards=cssText] readonly attribute CSSStyleDeclaration style;
+};
diff --git a/crates/web-sys/webidls/available/CSSPseudoElement.webidl b/crates/web-sys/webidls/available/CSSPseudoElement.webidl
new file mode 100644
index 00000000..6d33baf0
--- /dev/null
+++ b/crates/web-sys/webidls/available/CSSPseudoElement.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/css-pseudo/#CSSPseudoElement-interface
+ * https://drafts.csswg.org/cssom/#pseudoelement
+ *
+ * Copyright © 2015 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+// Both CSSOM and CSS Pseudo-Elements 4 provide contradictory definitions for
+// this interface.
+// What we implement here is a minimal subset of the two definitions which we
+// ship behind a pref until the specification issues have been resolved.
+[Func="nsDocument::IsWebAnimationsEnabled"]
+interface CSSPseudoElement {
+  readonly attribute DOMString type;
+  readonly attribute Element parentElement;
+};
+
+// https://drafts.csswg.org/web-animations/#extensions-to-the-pseudoelement-interface
+CSSPseudoElement implements Animatable;
diff --git a/crates/web-sys/webidls/available/CSSRule.webidl b/crates/web-sys/webidls/available/CSSRule.webidl
new file mode 100644
index 00000000..a8259303
--- /dev/null
+++ b/crates/web-sys/webidls/available/CSSRule.webidl
@@ -0,0 +1,58 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/cssom/#the-cssrule-interface
+ * https://drafts.csswg.org/css-animations/#interface-cssrule
+ * https://drafts.csswg.org/css-counter-styles-3/#extentions-to-cssrule-interface
+ * https://drafts.csswg.org/css-conditional-3/#extentions-to-cssrule-interface
+ * https://drafts.csswg.org/css-fonts-3/#om-fontfeaturevalues
+ */
+
+// https://drafts.csswg.org/cssom/#the-cssrule-interface
+interface CSSRule {
+
+  const unsigned short STYLE_RULE = 1;
+  const unsigned short CHARSET_RULE = 2; // historical
+  const unsigned short IMPORT_RULE = 3;
+  const unsigned short MEDIA_RULE = 4;
+  const unsigned short FONT_FACE_RULE = 5;
+  const unsigned short PAGE_RULE = 6;
+  // FIXME: We don't support MARGIN_RULE yet.
+  // XXXbz Should we expose the constant anyway?
+  // const unsigned short MARGIN_RULE = 9;
+  const unsigned short NAMESPACE_RULE = 10;
+  readonly attribute unsigned short type;
+  attribute DOMString cssText;
+  readonly attribute CSSRule? parentRule;
+  readonly attribute CSSStyleSheet? parentStyleSheet;
+};
+
+// https://drafts.csswg.org/css-animations/#interface-cssrule
+partial interface CSSRule {
+    const unsigned short KEYFRAMES_RULE = 7;
+    const unsigned short KEYFRAME_RULE = 8;
+};
+
+// https://drafts.csswg.org/css-counter-styles-3/#extentions-to-cssrule-interface
+partial interface CSSRule {
+    const unsigned short COUNTER_STYLE_RULE = 11;
+};
+
+// https://drafts.csswg.org/css-conditional-3/#extentions-to-cssrule-interface
+partial interface CSSRule {
+    const unsigned short SUPPORTS_RULE = 12;
+};
+
+// Non-standard extension for @-moz-document rules.
+partial interface CSSRule {
+    [ChromeOnly]
+    const unsigned short DOCUMENT_RULE = 13;
+};
+
+// https://drafts.csswg.org/css-fonts-3/#om-fontfeaturevalues
+partial interface CSSRule {
+  const unsigned short FONT_FEATURE_VALUES_RULE = 14;
+};
diff --git a/crates/web-sys/webidls/available/CSSRuleList.webidl b/crates/web-sys/webidls/available/CSSRuleList.webidl
new file mode 100644
index 00000000..c4faec14
--- /dev/null
+++ b/crates/web-sys/webidls/available/CSSRuleList.webidl
@@ -0,0 +1,10 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+interface CSSRuleList {
+  readonly attribute unsigned long length;
+  getter CSSRule? item(unsigned long index);
+};
diff --git a/crates/web-sys/webidls/available/CSSStyleDeclaration.webidl b/crates/web-sys/webidls/available/CSSStyleDeclaration.webidl
new file mode 100644
index 00000000..050edbd9
--- /dev/null
+++ b/crates/web-sys/webidls/available/CSSStyleDeclaration.webidl
@@ -0,0 +1,32 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/csswg/cssom/
+ */
+
+ // Because of getComputedStyle, many CSSStyleDeclaration objects can be
+ // short-living.
+[ProbablyShortLivingWrapper]
+interface CSSStyleDeclaration {
+  [CEReactions, SetterNeedsSubjectPrincipal=NonSystem, SetterThrows]
+  attribute DOMString cssText;
+
+  readonly attribute unsigned long length;
+  getter DOMString item(unsigned long index);
+
+  [Throws, ChromeOnly]
+  sequence<DOMString> getCSSImageURLs(DOMString property);
+
+  [Throws]
+  DOMString getPropertyValue(DOMString property);
+  DOMString getPropertyPriority(DOMString property);
+  [CEReactions, NeedsSubjectPrincipal=NonSystem, Throws]
+  void setProperty(DOMString property, [TreatNullAs=EmptyString] DOMString value, [TreatNullAs=EmptyString] optional DOMString priority = "");
+  [CEReactions, Throws]
+  DOMString removeProperty(DOMString property);
+
+  readonly attribute CSSRule? parentRule;
+};
diff --git a/crates/web-sys/webidls/available/CSSStyleRule.webidl b/crates/web-sys/webidls/available/CSSStyleRule.webidl
new file mode 100644
index 00000000..571bd6a5
--- /dev/null
+++ b/crates/web-sys/webidls/available/CSSStyleRule.webidl
@@ -0,0 +1,14 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/cssom/#the-cssstylerule-interface
+ */
+
+// https://drafts.csswg.org/cssom/#the-cssstylerule-interface
+interface CSSStyleRule : CSSRule {
+  attribute DOMString selectorText;
+  [SameObject, PutForwards=cssText] readonly attribute CSSStyleDeclaration style;
+};
diff --git a/crates/web-sys/webidls/available/CSSStyleSheet.webidl b/crates/web-sys/webidls/available/CSSStyleSheet.webidl
new file mode 100644
index 00000000..4c5f1977
--- /dev/null
+++ b/crates/web-sys/webidls/available/CSSStyleSheet.webidl
@@ -0,0 +1,27 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/csswg/cssom/
+ */
+
+enum CSSStyleSheetParsingMode {
+  "author",
+  "user",
+  "agent"
+};
+
+interface CSSStyleSheet : StyleSheet {
+  [Pure]
+  readonly attribute CSSRule? ownerRule;
+  [Throws, NeedsSubjectPrincipal]
+  readonly attribute CSSRuleList cssRules;
+  [ChromeOnly, BinaryName="parsingModeDOM"]
+  readonly attribute CSSStyleSheetParsingMode parsingMode;
+  [Throws, NeedsSubjectPrincipal]
+  unsigned long insertRule(DOMString rule, optional unsigned long index = 0);
+  [Throws, NeedsSubjectPrincipal]
+  void deleteRule(unsigned long index);
+};
diff --git a/crates/web-sys/webidls/available/CSSSupportsRule.webidl b/crates/web-sys/webidls/available/CSSSupportsRule.webidl
new file mode 100644
index 00000000..0576e90e
--- /dev/null
+++ b/crates/web-sys/webidls/available/CSSSupportsRule.webidl
@@ -0,0 +1,12 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/css-conditional/#the-csssupportsrule-interface
+ */
+
+// https://drafts.csswg.org/css-conditional/#the-csssupportsrule-interface
+interface CSSSupportsRule : CSSConditionRule {
+};
diff --git a/crates/web-sys/webidls/available/CSSTransition.webidl b/crates/web-sys/webidls/available/CSSTransition.webidl
new file mode 100644
index 00000000..44ffb79f
--- /dev/null
+++ b/crates/web-sys/webidls/available/CSSTransition.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/csswg/css-transitions-2/#the-CSSTransition-interface
+ *
+ * Copyright © 2015 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Func="nsDocument::IsWebAnimationsEnabled",
+ HeaderFile="nsTransitionManager.h"]
+interface CSSTransition : Animation {
+  [Constant] readonly attribute DOMString transitionProperty;
+};
diff --git a/crates/web-sys/webidls/available/Cache.webidl b/crates/web-sys/webidls/available/Cache.webidl
new file mode 100644
index 00000000..3df0ba31
--- /dev/null
+++ b/crates/web-sys/webidls/available/Cache.webidl
@@ -0,0 +1,44 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html
+ *
+ */
+
+// https://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html#cache
+
+[Exposed=(Window,Worker),
+ Func="mozilla::dom::DOMPrefs::DOMCachesEnabled"]
+interface Cache {
+  [NewObject]
+  Promise<Response> match(RequestInfo request, optional CacheQueryOptions options);
+  [NewObject]
+  Promise<sequence<Response>> matchAll(optional RequestInfo request, optional CacheQueryOptions options);
+  [NewObject, NeedsCallerType]
+  Promise<void> add(RequestInfo request);
+  [NewObject, NeedsCallerType]
+  Promise<void> addAll(sequence<RequestInfo> requests);
+  [NewObject]
+  Promise<void> put(RequestInfo request, Response response);
+  [NewObject]
+  Promise<boolean> delete(RequestInfo request, optional CacheQueryOptions options);
+  [NewObject]
+  Promise<sequence<Request>> keys(optional RequestInfo request, optional CacheQueryOptions options);
+};
+
+dictionary CacheQueryOptions {
+  boolean ignoreSearch = false;
+  boolean ignoreMethod = false;
+  boolean ignoreVary = false;
+  DOMString cacheName;
+};
+
+dictionary CacheBatchOperation {
+  DOMString type;
+  Request request;
+  Response response;
+  CacheQueryOptions options;
+};
diff --git a/crates/web-sys/webidls/available/CacheStorage.webidl b/crates/web-sys/webidls/available/CacheStorage.webidl
new file mode 100644
index 00000000..135006c2
--- /dev/null
+++ b/crates/web-sys/webidls/available/CacheStorage.webidl
@@ -0,0 +1,34 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html
+ *
+ */
+
+// https://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html#cache-storage
+
+interface Principal;
+
+[Exposed=(Window,Worker),
+ ChromeConstructor(CacheStorageNamespace namespace, Principal principal),
+ Func="mozilla::dom::DOMPrefs::DOMCachesEnabled"]
+interface CacheStorage {
+  [NewObject]
+  Promise<Response> match(RequestInfo request, optional CacheQueryOptions options);
+  [NewObject]
+  Promise<boolean> has(DOMString cacheName);
+  [NewObject]
+  Promise<Cache> open(DOMString cacheName);
+  [NewObject]
+  Promise<boolean> delete(DOMString cacheName);
+  [NewObject]
+  Promise<sequence<DOMString>> keys();
+};
+
+// chrome-only, gecko specific extension
+enum CacheStorageNamespace {
+  "content", "chrome"
+};
diff --git a/crates/web-sys/webidls/available/CanvasCaptureMediaStream.webidl b/crates/web-sys/webidls/available/CanvasCaptureMediaStream.webidl
new file mode 100644
index 00000000..98b1adbf
--- /dev/null
+++ b/crates/web-sys/webidls/available/CanvasCaptureMediaStream.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/mediacapture-fromelement/index.html
+ *
+ * Copyright © 2015 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved.
+ * W3C liability, trademark and document use rules apply.
+ */
+
+[Pref="canvas.capturestream.enabled"]
+interface CanvasCaptureMediaStream : MediaStream {
+    readonly attribute HTMLCanvasElement canvas;
+    void requestFrame();
+};
diff --git a/crates/web-sys/webidls/available/CanvasRenderingContext2D.webidl b/crates/web-sys/webidls/available/CanvasRenderingContext2D.webidl
new file mode 100644
index 00000000..13f61d4f
--- /dev/null
+++ b/crates/web-sys/webidls/available/CanvasRenderingContext2D.webidl
@@ -0,0 +1,400 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+enum CanvasWindingRule { "nonzero", "evenodd" };
+
+dictionary ContextAttributes2D {
+  // whether or not we're planning to do a lot of readback operations
+  boolean willReadFrequently = false;
+  // signal if the canvas contains an alpha channel
+  boolean alpha = true;
+};
+
+dictionary HitRegionOptions {
+  Path2D? path = null;
+  DOMString id = "";
+  Element? control = null;
+};
+
+typedef (HTMLImageElement or
+         SVGImageElement) HTMLOrSVGImageElement;
+
+typedef (HTMLOrSVGImageElement or
+         HTMLCanvasElement or
+         HTMLVideoElement or
+         ImageBitmap) CanvasImageSource;
+
+interface CanvasRenderingContext2D {
+
+  // back-reference to the canvas.  Might be null if we're not
+  // associated with a canvas.
+  readonly attribute HTMLCanvasElement? canvas;
+
+  // Mozilla-specific stuff
+  // FIXME Bug 768048 mozCurrentTransform/mozCurrentTransformInverse should return a WebIDL array.
+  [Throws]
+  attribute object mozCurrentTransform; // [ m11, m12, m21, m22, dx, dy ], i.e. row major
+  [Throws]
+  attribute object mozCurrentTransformInverse;
+
+  [SetterThrows]
+  attribute DOMString mozTextStyle;
+
+  // image smoothing mode -- if disabled, images won't be smoothed
+  // if scaled.
+  [Deprecated="PrefixedImageSmoothingEnabled"]
+  attribute boolean mozImageSmoothingEnabled;
+
+  // Show the caret if appropriate when drawing
+  [Func="CanvasUtils::HasDrawWindowPrivilege"]
+  const unsigned long DRAWWINDOW_DRAW_CARET   = 0x01;
+  // Don't flush pending layout notifications that could otherwise
+  // be batched up
+  [Func="CanvasUtils::HasDrawWindowPrivilege"]
+  const unsigned long DRAWWINDOW_DO_NOT_FLUSH = 0x02;
+  // Draw scrollbars and scroll the viewport if they are present
+  [Func="CanvasUtils::HasDrawWindowPrivilege"]
+  const unsigned long DRAWWINDOW_DRAW_VIEW    = 0x04;
+  // Use the widget layer manager if available. This means hardware
+  // acceleration may be used, but it might actually be slower or
+  // lower quality than normal. It will however more accurately reflect
+  // the pixels rendered to the screen.
+  [Func="CanvasUtils::HasDrawWindowPrivilege"]
+  const unsigned long DRAWWINDOW_USE_WIDGET_LAYERS = 0x08;
+  // Don't synchronously decode images - draw what we have
+  [Func="CanvasUtils::HasDrawWindowPrivilege"]
+  const unsigned long DRAWWINDOW_ASYNC_DECODE_IMAGES = 0x10;
+
+  /**
+   * Renders a region of a window into the canvas.  The contents of
+   * the window's viewport are rendered, ignoring viewport clipping
+   * and scrolling.
+   *
+   * @param x
+   * @param y
+   * @param w
+   * @param h specify the area of the window to render, in CSS
+   * pixels.
+   *
+   * @param backgroundColor the canvas is filled with this color
+   * before we render the window into it. This color may be
+   * transparent/translucent. It is given as a CSS color string
+   * (e.g., rgb() or rgba()).
+   *
+   * @param flags Used to better control the drawWindow call.
+   * Flags can be ORed together.
+   *
+   * Of course, the rendering obeys the current scale, transform and
+   * globalAlpha values.
+   *
+   * Hints:
+   * -- If 'rgba(0,0,0,0)' is used for the background color, the
+   * drawing will be transparent wherever the window is transparent.
+   * -- Top-level browsed documents are usually not transparent
+   * because the user's background-color preference is applied,
+   * but IFRAMEs are transparent if the page doesn't set a background.
+   * -- If an opaque color is used for the background color, rendering
+   * will be faster because we won't have to compute the window's
+   * transparency.
+   *
+   * This API cannot currently be used by Web content. It is chrome
+   * and Web Extensions (with a permission) only.
+   */
+  [Throws, Func="CanvasUtils::HasDrawWindowPrivilege"]
+  void drawWindow(Window window, double x, double y, double w, double h,
+                  DOMString bgColor, optional unsigned long flags = 0);
+
+  /**
+   * This causes a context that is currently using a hardware-accelerated
+   * backend to fallback to a software one. All state should be preserved.
+   */
+  [ChromeOnly]
+  void demote();
+};
+
+CanvasRenderingContext2D implements CanvasState;
+CanvasRenderingContext2D implements CanvasTransform;
+CanvasRenderingContext2D implements CanvasCompositing;
+CanvasRenderingContext2D implements CanvasImageSmoothing;
+CanvasRenderingContext2D implements CanvasFillStrokeStyles;
+CanvasRenderingContext2D implements CanvasShadowStyles;
+CanvasRenderingContext2D implements CanvasFilters;
+CanvasRenderingContext2D implements CanvasRect;
+CanvasRenderingContext2D implements CanvasDrawPath;
+CanvasRenderingContext2D implements CanvasUserInterface;
+CanvasRenderingContext2D implements CanvasText;
+CanvasRenderingContext2D implements CanvasDrawImage;
+CanvasRenderingContext2D implements CanvasImageData;
+CanvasRenderingContext2D implements CanvasPathDrawingStyles;
+CanvasRenderingContext2D implements CanvasTextDrawingStyles;
+CanvasRenderingContext2D implements CanvasPathMethods;
+CanvasRenderingContext2D implements CanvasHitRegions;
+
+
+[NoInterfaceObject]
+interface CanvasState {
+  // state
+  void save(); // push state on state stack
+  void restore(); // pop state stack and restore state
+};
+
+[NoInterfaceObject]
+interface CanvasTransform {
+  // transformations (default transform is the identity matrix)
+// NOT IMPLEMENTED           attribute SVGMatrix currentTransform;
+  [Throws, LenientFloat]
+  void scale(double x, double y);
+  [Throws, LenientFloat]
+  void rotate(double angle);
+  [Throws, LenientFloat]
+  void translate(double x, double y);
+  [Throws, LenientFloat]
+  void transform(double a, double b, double c, double d, double e, double f);
+  [Throws, LenientFloat]
+  void setTransform(double a, double b, double c, double d, double e, double f);
+  [Throws]
+  void resetTransform();
+};
+
+[NoInterfaceObject]
+interface CanvasCompositing {
+  attribute unrestricted double globalAlpha; // (default 1.0)
+  [Throws]
+  attribute DOMString globalCompositeOperation; // (default source-over)
+};
+
+[NoInterfaceObject]
+interface CanvasImageSmoothing {
+  // drawing images
+  attribute boolean imageSmoothingEnabled;
+};
+
+[NoInterfaceObject]
+interface CanvasFillStrokeStyles {
+  // colors and styles (see also the CanvasPathDrawingStyles interface)
+  attribute (DOMString or CanvasGradient or CanvasPattern) strokeStyle; // (default black)
+  attribute (DOMString or CanvasGradient or CanvasPattern) fillStyle; // (default black)
+  [NewObject]
+  CanvasGradient createLinearGradient(double x0, double y0, double x1, double y1);
+  [NewObject, Throws]
+  CanvasGradient createRadialGradient(double x0, double y0, double r0, double x1, double y1, double r1);
+  [NewObject, Throws]
+  CanvasPattern? createPattern(CanvasImageSource image, [TreatNullAs=EmptyString] DOMString repetition);
+};
+
+[NoInterfaceObject]
+interface CanvasShadowStyles {
+  [LenientFloat]
+  attribute double shadowOffsetX; // (default 0)
+  [LenientFloat]
+  attribute double shadowOffsetY; // (default 0)
+  [LenientFloat]
+  attribute double shadowBlur; // (default 0)
+  attribute DOMString shadowColor; // (default transparent black)
+};
+
+[NoInterfaceObject]
+interface CanvasFilters {
+  [Pref="canvas.filters.enabled", SetterThrows]
+  attribute DOMString filter; // (default empty string = no filter)
+};
+
+[NoInterfaceObject]
+interface CanvasRect {
+  [LenientFloat]
+  void clearRect(double x, double y, double w, double h);
+  [LenientFloat]
+  void fillRect(double x, double y, double w, double h);
+  [LenientFloat]
+  void strokeRect(double x, double y, double w, double h);
+};
+
+[NoInterfaceObject]
+interface CanvasDrawPath {
+  // path API (see also CanvasPathMethods)
+  void beginPath();
+  void fill(optional CanvasWindingRule winding = "nonzero");
+  void fill(Path2D path, optional CanvasWindingRule winding = "nonzero");
+  void stroke();
+  void stroke(Path2D path);
+  void clip(optional CanvasWindingRule winding = "nonzero");
+  void clip(Path2D path, optional CanvasWindingRule winding = "nonzero");
+// NOT IMPLEMENTED  void resetClip();
+  [NeedsSubjectPrincipal]
+  boolean isPointInPath(unrestricted double x, unrestricted double y, optional CanvasWindingRule winding = "nonzero");
+  [NeedsSubjectPrincipal] // Only required because overloads can't have different extended attributes.
+  boolean isPointInPath(Path2D path, unrestricted double x, unrestricted double y, optional CanvasWindingRule winding = "nonzero");
+  [NeedsSubjectPrincipal]
+  boolean isPointInStroke(double x, double y);
+  [NeedsSubjectPrincipal] // Only required because overloads can't have different extended attributes.
+  boolean isPointInStroke(Path2D path, unrestricted double x, unrestricted double y);
+};
+
+[NoInterfaceObject]
+interface CanvasUserInterface {
+  [Pref="canvas.focusring.enabled", Throws] void drawFocusIfNeeded(Element element);
+// NOT IMPLEMENTED  void drawSystemFocusRing(Path path, HTMLElement element);
+  [Pref="canvas.customfocusring.enabled"] boolean drawCustomFocusRing(Element element);
+// NOT IMPLEMENTED  boolean drawCustomFocusRing(Path path, HTMLElement element);
+// NOT IMPLEMENTED  void scrollPathIntoView();
+// NOT IMPLEMENTED  void scrollPathIntoView(Path path);
+};
+
+[NoInterfaceObject]
+interface CanvasText {
+  // text (see also the CanvasPathDrawingStyles interface)
+  [Throws, LenientFloat]
+  void fillText(DOMString text, double x, double y, optional double maxWidth);
+  [Throws, LenientFloat]
+  void strokeText(DOMString text, double x, double y, optional double maxWidth);
+  [NewObject, Throws]
+  TextMetrics measureText(DOMString text);
+};
+
+[NoInterfaceObject]
+interface CanvasDrawImage {
+  [Throws, LenientFloat]
+  void drawImage(CanvasImageSource image, double dx, double dy);
+  [Throws, LenientFloat]
+  void drawImage(CanvasImageSource image, double dx, double dy, double dw, double dh);
+  [Throws, LenientFloat]
+  void drawImage(CanvasImageSource image, double sx, double sy, double sw, double sh, double dx, double dy, double dw, double dh);
+};
+
+[NoInterfaceObject]
+interface CanvasImageData {
+  // pixel manipulation
+  [NewObject, Throws]
+  ImageData createImageData(double sw, double sh);
+  [NewObject, Throws]
+  ImageData createImageData(ImageData imagedata);
+  [NewObject, Throws, NeedsSubjectPrincipal]
+  ImageData getImageData(double sx, double sy, double sw, double sh);
+  [Throws]
+  void putImageData(ImageData imagedata, double dx, double dy);
+  [Throws]
+  void putImageData(ImageData imagedata, double dx, double dy, double dirtyX, double dirtyY, double dirtyWidth, double dirtyHeight);
+};
+
+[NoInterfaceObject]
+interface CanvasPathDrawingStyles {
+  // line caps/joins
+  [LenientFloat]
+  attribute double lineWidth; // (default 1)
+  attribute DOMString lineCap; // "butt", "round", "square" (default "butt")
+  [GetterThrows]
+  attribute DOMString lineJoin; // "round", "bevel", "miter" (default "miter")
+  [LenientFloat]
+  attribute double miterLimit; // (default 10)
+
+  // dashed lines
+  [LenientFloat, Throws] void setLineDash(sequence<double> segments); // default empty
+  sequence<double> getLineDash();
+  [LenientFloat] attribute double lineDashOffset;
+};
+
+[NoInterfaceObject]
+interface CanvasTextDrawingStyles {
+  // text
+  [SetterThrows]
+  attribute DOMString font; // (default 10px sans-serif)
+  attribute DOMString textAlign; // "start", "end", "left", "right", "center" (default: "start")
+  attribute DOMString textBaseline; // "top", "hanging", "middle", "alphabetic", "ideographic", "bottom" (default: "alphabetic")
+};
+
+[NoInterfaceObject]
+interface CanvasPathMethods {
+  // shared path API methods
+  void closePath();
+  [LenientFloat]
+  void moveTo(double x, double y);
+  [LenientFloat]
+  void lineTo(double x, double y);
+  [LenientFloat]
+  void quadraticCurveTo(double cpx, double cpy, double x, double y);
+
+  [LenientFloat]
+  void bezierCurveTo(double cp1x, double cp1y, double cp2x, double cp2y, double x, double y);
+
+  [Throws, LenientFloat]
+  void arcTo(double x1, double y1, double x2, double y2, double radius);
+// NOT IMPLEMENTED  [LenientFloat] void arcTo(double x1, double y1, double x2, double y2, double radiusX, double radiusY, double rotation);
+
+  [LenientFloat]
+  void rect(double x, double y, double w, double h);
+
+  [Throws, LenientFloat]
+  void arc(double x, double y, double radius, double startAngle, double endAngle, optional boolean anticlockwise = false);
+
+  [Throws, LenientFloat]
+  void ellipse(double x, double y, double radiusX, double radiusY, double rotation, double startAngle, double endAngle, optional boolean anticlockwise = false);
+};
+
+[NoInterfaceObject]
+interface CanvasHitRegions {
+  // hit regions
+  [Pref="canvas.hitregions.enabled", Throws] void addHitRegion(optional HitRegionOptions options);
+  [Pref="canvas.hitregions.enabled"] void removeHitRegion(DOMString id);
+  [Pref="canvas.hitregions.enabled"] void clearHitRegions();
+};
+
+interface CanvasGradient {
+  // opaque object
+  [Throws]
+  // addColorStop should take a double
+  void addColorStop(float offset, DOMString color);
+};
+
+interface CanvasPattern {
+  // opaque object
+  // [Throws, LenientFloat] - could not do this overload because of bug 1020975
+  // void setTransform(double a, double b, double c, double d, double e, double f);
+
+  // No throw necessary here - SVGMatrix is always good.
+  void setTransform(SVGMatrix matrix);
+};
+
+interface TextMetrics {
+
+  // x-direction
+  readonly attribute double width; // advance width
+
+  /*
+   * NOT IMPLEMENTED YET
+
+  readonly attribute double actualBoundingBoxLeft;
+  readonly attribute double actualBoundingBoxRight;
+
+  // y-direction
+  readonly attribute double fontBoundingBoxAscent;
+  readonly attribute double fontBoundingBoxDescent;
+  readonly attribute double actualBoundingBoxAscent;
+  readonly attribute double actualBoundingBoxDescent;
+  readonly attribute double emHeightAscent;
+  readonly attribute double emHeightDescent;
+  readonly attribute double hangingBaseline;
+  readonly attribute double alphabeticBaseline;
+  readonly attribute double ideographicBaseline;
+  */
+
+};
+
+[Pref="canvas.path.enabled",
+ Constructor,
+ Constructor(Path2D other),
+ Constructor(DOMString pathString)]
+interface Path2D
+{
+  void addPath(Path2D path, optional SVGMatrix transformation);
+};
+Path2D implements CanvasPathMethods;
diff --git a/crates/web-sys/webidls/available/CaretPosition.webidl b/crates/web-sys/webidls/available/CaretPosition.webidl
new file mode 100644
index 00000000..5907b40d
--- /dev/null
+++ b/crates/web-sys/webidls/available/CaretPosition.webidl
@@ -0,0 +1,20 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+interface CaretPosition {
+
+  /**
+   * The offsetNode could potentially be null due to anonymous content.
+   */
+  readonly attribute Node? offsetNode;
+  readonly attribute unsigned long offset;
+
+};
+
+/**
+ * Gecko specific methods and properties for CaretPosition.
+ */
+partial interface CaretPosition {
+  DOMRect? getClientRect();
+};
diff --git a/crates/web-sys/webidls/available/CaretStateChangedEvent.webidl b/crates/web-sys/webidls/available/CaretStateChangedEvent.webidl
new file mode 100644
index 00000000..39edd4d8
--- /dev/null
+++ b/crates/web-sys/webidls/available/CaretStateChangedEvent.webidl
@@ -0,0 +1,39 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+enum CaretChangedReason {
+  "visibilitychange",
+  "updateposition",
+  "longpressonemptycontent",
+  "taponcaret",
+  "presscaret",
+  "releasecaret",
+  "scroll"
+};
+
+dictionary CaretStateChangedEventInit : EventInit {
+  boolean collapsed = true;
+  DOMRectReadOnly? boundingClientRect = null;
+  CaretChangedReason reason = "visibilitychange";
+  boolean caretVisible = false;
+  boolean caretVisuallyVisible = false;
+  boolean selectionVisible = false;
+  boolean selectionEditable = false;
+  DOMString selectedTextContent = "";
+};
+
+[Constructor(DOMString type, optional CaretStateChangedEventInit eventInit),
+ ChromeOnly]
+interface CaretStateChangedEvent : Event {
+  readonly attribute boolean collapsed;
+  readonly attribute DOMRectReadOnly? boundingClientRect;
+  readonly attribute CaretChangedReason reason;
+  readonly attribute boolean caretVisible;
+  readonly attribute boolean caretVisuallyVisible;
+  readonly attribute boolean selectionVisible;
+  readonly attribute boolean selectionEditable;
+  readonly attribute DOMString selectedTextContent;
+};
diff --git a/crates/web-sys/webidls/available/ChannelMergerNode.webidl b/crates/web-sys/webidls/available/ChannelMergerNode.webidl
new file mode 100644
index 00000000..6818abae
--- /dev/null
+++ b/crates/web-sys/webidls/available/ChannelMergerNode.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary ChannelMergerOptions : AudioNodeOptions {
+             unsigned long numberOfInputs = 6;
+};
+
+[Pref="dom.webaudio.enabled",
+ Constructor(BaseAudioContext context, optional ChannelMergerOptions options)]
+interface ChannelMergerNode : AudioNode {
+};
diff --git a/crates/web-sys/webidls/available/ChannelSplitterNode.webidl b/crates/web-sys/webidls/available/ChannelSplitterNode.webidl
new file mode 100644
index 00000000..25d254ca
--- /dev/null
+++ b/crates/web-sys/webidls/available/ChannelSplitterNode.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary ChannelSplitterOptions : AudioNodeOptions {
+             unsigned long numberOfOutputs = 6;
+};
+
+[Pref="dom.webaudio.enabled",
+ Constructor(BaseAudioContext context, optional ChannelSplitterOptions options)]
+interface ChannelSplitterNode : AudioNode {
+
+};
+
diff --git a/crates/web-sys/webidls/available/CharacterData.webidl b/crates/web-sys/webidls/available/CharacterData.webidl
new file mode 100644
index 00000000..8d6a214e
--- /dev/null
+++ b/crates/web-sys/webidls/available/CharacterData.webidl
@@ -0,0 +1,31 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dom.spec.whatwg.org/#characterdata
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface CharacterData : Node {
+  [TreatNullAs=EmptyString, Pure, SetterThrows]
+  attribute DOMString data;
+  [Pure]
+  readonly attribute unsigned long length;
+  [Throws]
+  DOMString substringData(unsigned long offset, unsigned long count);
+  [Throws]
+  void appendData(DOMString data);
+  [Throws]
+  void insertData(unsigned long offset, DOMString data);
+  [Throws]
+  void deleteData(unsigned long offset, unsigned long count);
+  [Throws]
+  void replaceData(unsigned long offset, unsigned long count, DOMString data);
+};
+
+CharacterData implements ChildNode;
+CharacterData implements NonDocumentTypeChildNode;
diff --git a/crates/web-sys/webidls/available/CheckerboardReportService.webidl b/crates/web-sys/webidls/available/CheckerboardReportService.webidl
new file mode 100644
index 00000000..d5a624e0
--- /dev/null
+++ b/crates/web-sys/webidls/available/CheckerboardReportService.webidl
@@ -0,0 +1,58 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/*
+ * This file declares data structures used to communicate checkerboard reports
+ * from C++ code to about:checkerboard (see bug 1238042). These dictionaries
+ * are NOT exposed to standard web content.
+ */
+
+enum CheckerboardReason {
+  "severe",
+  "recent"
+};
+
+// Individual checkerboard report. Contains fields for the severity of the
+// checkerboard event, the timestamp at which it was reported, the detailed
+// log of the event, and the reason this report was saved (currently either
+// "severe" or "recent").
+dictionary CheckerboardReport {
+  unsigned long severity;
+  DOMTimeStamp timestamp; // milliseconds since epoch
+  DOMString log;
+  CheckerboardReason reason;
+};
+
+// The guard function only allows creation of this interface on the
+// about:checkerboard page, and only if it's in the parent process.
+[Func="mozilla::dom::CheckerboardReportService::IsEnabled",
+ Constructor]
+interface CheckerboardReportService {
+  /**
+   * Gets the available checkerboard reports.
+   */
+  sequence<CheckerboardReport> getReports();
+
+  /**
+   * Gets the state of the apz.record_checkerboarding pref.
+   */
+  boolean isRecordingEnabled();
+
+  /**
+   * Sets the state of the apz.record_checkerboarding pref.
+   */
+  void setRecordingEnabled(boolean aEnabled);
+
+  /**
+   * Flush any in-progress checkerboard reports. Since this happens
+   * asynchronously, the caller may register an observer with the observer
+   * service to be notified when this operation is complete. The observer should
+   * listen for the topic "APZ:FlushActiveCheckerboard:Done". Upon receiving
+   * this notification, the caller may call getReports() to obtain the flushed
+   * reports, along with any other reports that are available.
+   */
+  void flushActiveReports();
+};
diff --git a/crates/web-sys/webidls/available/ChildNode.webidl b/crates/web-sys/webidls/available/ChildNode.webidl
new file mode 100644
index 00000000..ae36cd93
--- /dev/null
+++ b/crates/web-sys/webidls/available/ChildNode.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dom.spec.whatwg.org/#interface-childnode
+ */
+
+[NoInterfaceObject]
+interface ChildNode {
+  [CEReactions, Throws, Unscopable]
+  void before((Node or DOMString)... nodes);
+  [CEReactions, Throws, Unscopable]
+  void after((Node or DOMString)... nodes);
+  [CEReactions, Throws, Unscopable]
+  void replaceWith((Node or DOMString)... nodes);
+  [CEReactions, Unscopable]
+  void remove();
+};
+
+[NoInterfaceObject]
+interface NonDocumentTypeChildNode {
+  [Pure]
+  readonly attribute Element? previousElementSibling;
+  [Pure]
+  readonly attribute Element? nextElementSibling;
+};
diff --git a/crates/web-sys/webidls/available/ChildSHistory.webidl b/crates/web-sys/webidls/available/ChildSHistory.webidl
new file mode 100644
index 00000000..17db8d66
--- /dev/null
+++ b/crates/web-sys/webidls/available/ChildSHistory.webidl
@@ -0,0 +1,39 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+interface nsISHistory;
+
+/**
+ * The ChildSHistory interface represents the child side of a browsing
+ * context's session history.
+ */
+[ChromeOnly]
+interface ChildSHistory {
+  [Pure]
+  readonly attribute long count;
+  [Pure]
+  readonly attribute long index;
+
+  boolean canGo(long aOffset);
+  [Throws]
+  void go(long aOffset);
+
+  /**
+   * Reload the current entry. The flags which should be passed to this
+   * function are documented and defined in nsIWebNavigation.idl
+   */
+  [Throws]
+  void reload(unsigned long aReloadFlags);
+
+  /**
+   * Getter for the legacy nsISHistory implementation.
+   *
+   * This getter _will be going away_, but is needed while we finish
+   * implementing all of the APIs which we will need in the content
+   * process on ChildSHistory.
+   */
+  readonly attribute nsISHistory legacySHistory;
+};
diff --git a/crates/web-sys/webidls/available/ChromeNodeList.webidl b/crates/web-sys/webidls/available/ChromeNodeList.webidl
new file mode 100644
index 00000000..3f062f2a
--- /dev/null
+++ b/crates/web-sys/webidls/available/ChromeNodeList.webidl
@@ -0,0 +1,13 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Constructor, Func="IsChromeOrXBL"]
+interface ChromeNodeList : NodeList {
+  [Throws]
+  void append(Node aNode);
+  [Throws]
+  void remove(Node aNode);
+};
diff --git a/crates/web-sys/webidls/available/Client.webidl b/crates/web-sys/webidls/available/Client.webidl
new file mode 100644
index 00000000..75d60b6d
--- /dev/null
+++ b/crates/web-sys/webidls/available/Client.webidl
@@ -0,0 +1,51 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/ServiceWorker/#client-interface
+ *
+ */
+
+[Exposed=ServiceWorker]
+interface Client {
+  readonly attribute USVString url;
+
+  // Remove frameType in bug 1290936
+  [BinaryName="GetFrameType"]
+  readonly attribute FrameType frameType;
+
+  readonly attribute ClientType type;
+  readonly attribute DOMString id;
+
+  // Implement reserved in bug 1264177
+  // readonly attribute boolean reserved;
+
+  [Throws]
+  void postMessage(any message, optional sequence<object> transfer = []);
+};
+
+[Exposed=ServiceWorker]
+interface WindowClient : Client {
+  [BinaryName="GetVisibilityState"]
+  readonly attribute VisibilityState visibilityState;
+  readonly attribute boolean focused;
+
+  // Implement ancestorOrigins in bug 1264180
+  // [SameObject] readonly attribute FrozenArray<USVString> ancestorOrigins;
+
+  [Throws, NewObject]
+  Promise<WindowClient> focus();
+
+  [Throws, NewObject]
+  Promise<WindowClient> navigate(USVString url);
+};
+
+// Remove FrameType in bug 1290936
+enum FrameType {
+  "auxiliary",
+  "top-level",
+  "nested",
+  "none"
+};
diff --git a/crates/web-sys/webidls/available/Clients.webidl b/crates/web-sys/webidls/available/Clients.webidl
new file mode 100644
index 00000000..054ee0e5
--- /dev/null
+++ b/crates/web-sys/webidls/available/Clients.webidl
@@ -0,0 +1,37 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html
+ *
+ */
+
+[Exposed=ServiceWorker]
+interface Clients {
+  // The objects returned will be new instances every time
+  [NewObject]
+  Promise<any> get(DOMString id);
+  [NewObject]
+  Promise<sequence<Client>> matchAll(optional ClientQueryOptions options);
+  [NewObject]
+  Promise<WindowClient?> openWindow(USVString url);
+  [NewObject]
+  Promise<void> claim();
+};
+
+dictionary ClientQueryOptions {
+  boolean includeUncontrolled = false;
+  ClientType type = "window";
+};
+
+enum ClientType {
+  "window",
+  "worker",
+  "sharedworker",
+  // https://github.com/w3c/ServiceWorker/issues/1036
+  "serviceworker",
+  "all"
+};
+
diff --git a/crates/web-sys/webidls/available/ClipboardEvent.webidl b/crates/web-sys/webidls/available/ClipboardEvent.webidl
new file mode 100644
index 00000000..8fe8a493
--- /dev/null
+++ b/crates/web-sys/webidls/available/ClipboardEvent.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface please see
+ * http://dev.w3.org/2006/webapi/clipops/#x5-clipboard-event-interfaces
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Constructor(DOMString type, optional ClipboardEventInit eventInitDict)]
+interface ClipboardEvent : Event
+{
+  readonly attribute DataTransfer? clipboardData;
+};
+
+dictionary ClipboardEventInit : EventInit
+{
+  DOMString data = "";
+  DOMString dataType = "";
+};
diff --git a/crates/web-sys/webidls/available/CloseEvent.webidl b/crates/web-sys/webidls/available/CloseEvent.webidl
new file mode 100644
index 00000000..4fddbd83
--- /dev/null
+++ b/crates/web-sys/webidls/available/CloseEvent.webidl
@@ -0,0 +1,27 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The nsIDOMCloseEvent interface is the interface to the event
+ * close on a WebSocket object.
+ *
+ * For more information on this interface, please see
+ * http://www.whatwg.org/specs/web-apps/current-work/multipage/network.html#closeevent
+ */
+
+[Constructor(DOMString type, optional CloseEventInit eventInitDict),LegacyEventInit,
+ Exposed=(Window,Worker)]
+interface CloseEvent : Event
+{
+  readonly attribute boolean wasClean;
+  readonly attribute unsigned short code;
+  readonly attribute DOMString reason;
+};
+
+dictionary CloseEventInit : EventInit
+{
+  boolean wasClean = false;
+  unsigned short code = 0;
+  DOMString reason = "";
+};
diff --git a/crates/web-sys/webidls/available/CommandEvent.webidl b/crates/web-sys/webidls/available/CommandEvent.webidl
new file mode 100644
index 00000000..0ce0a4e0
--- /dev/null
+++ b/crates/web-sys/webidls/available/CommandEvent.webidl
@@ -0,0 +1,10 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Func="IsChromeOrXBL"]
+interface CommandEvent : Event {
+  readonly attribute DOMString? command;
+};
diff --git a/crates/web-sys/webidls/available/Comment.webidl b/crates/web-sys/webidls/available/Comment.webidl
new file mode 100644
index 00000000..023335f1
--- /dev/null
+++ b/crates/web-sys/webidls/available/Comment.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dom.spec.whatwg.org/#comment
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Constructor(optional DOMString data = "")]
+interface Comment : CharacterData {
+};
diff --git a/crates/web-sys/webidls/available/CompositionEvent.webidl b/crates/web-sys/webidls/available/CompositionEvent.webidl
new file mode 100644
index 00000000..16c5d6ea
--- /dev/null
+++ b/crates/web-sys/webidls/available/CompositionEvent.webidl
@@ -0,0 +1,39 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * https://w3c.github.io/uievents/#interface-compositionevent
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Constructor(DOMString type, optional CompositionEventInit eventInitDict)]
+interface CompositionEvent : UIEvent
+{
+  readonly attribute DOMString? data;
+  // locale is currently non-standard
+  readonly attribute DOMString  locale;
+
+ /**
+  * ranges is trying to expose TextRangeArray in Gecko so a
+  * js-plugin couble be able to know the clauses information
+  */
+  [ChromeOnly,Cached,Pure]
+  readonly attribute sequence<TextClause> ranges;
+};
+
+dictionary CompositionEventInit : UIEventInit {
+  DOMString data = "";
+};
+
+partial interface CompositionEvent
+{
+  void initCompositionEvent(DOMString typeArg,
+                            optional boolean canBubbleArg = false,
+                            optional boolean cancelableArg = false,
+                            optional Window? viewArg = null,
+                            optional DOMString? dataArg = null,
+                            optional DOMString localeArg = "");
+};
diff --git a/crates/web-sys/webidls/available/Console.webidl b/crates/web-sys/webidls/available/Console.webidl
new file mode 100644
index 00000000..6fbce7a4
--- /dev/null
+++ b/crates/web-sys/webidls/available/Console.webidl
@@ -0,0 +1,229 @@
+/* -*- Mode: IDL; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface, please see
+ * https://console.spec.whatwg.org/#console-namespace
+ */
+
+[Exposed=(Window,Worker,WorkerDebugger,Worklet,System),
+ ClassString="Console",
+ ProtoObjectHack]
+namespace console {
+
+  // NOTE: if you touch this namespace, remember to update the ConsoleInstance
+  // interface as well!
+
+  // Logging
+  [UseCounter]
+  void assert(optional boolean condition = false, any... data);
+  [UseCounter]
+  void clear();
+  [UseCounter]
+  void count(optional DOMString label = "default");
+  [UseCounter]
+  void countReset(optional DOMString label = "default");
+  [UseCounter]
+  void debug(any... data);
+  [UseCounter]
+  void error(any... data);
+  [UseCounter]
+  void info(any... data);
+  [UseCounter]
+  void log(any... data);
+  [UseCounter]
+  void table(any... data); // FIXME: The spec is still unclear about this.
+  [UseCounter]
+  void trace(any... data);
+  [UseCounter]
+  void warn(any... data);
+  [UseCounter]
+  void dir(any... data); // FIXME: This doesn't follow the spec yet.
+  [UseCounter]
+  void dirxml(any... data);
+
+  // Grouping
+  [UseCounter]
+  void group(any... data);
+  [UseCounter]
+  void groupCollapsed(any... data);
+  [UseCounter]
+  void groupEnd();
+
+  // Timing
+  [UseCounter]
+  void time(optional DOMString label = "default");
+  [UseCounter]
+  void timeLog(optional DOMString label = "default", any... data);
+  [UseCounter]
+  void timeEnd(optional DOMString label = "default");
+
+  // Mozilla only or Webcompat methods
+
+  [UseCounter]
+  void _exception(any... data);
+  [UseCounter]
+  void timeStamp(optional any data);
+
+  [UseCounter]
+  void profile(any... data);
+  [UseCounter]
+  void profileEnd(any... data);
+
+  [ChromeOnly]
+  const boolean IS_NATIVE_CONSOLE = true;
+
+  [ChromeOnly, NewObject]
+  ConsoleInstance createInstance(optional ConsoleInstanceOptions options);
+};
+
+// This is used to propagate console events to the observers.
+dictionary ConsoleEvent {
+  (unsigned long long or DOMString) ID;
+  (unsigned long long or DOMString) innerID;
+  DOMString consoleID = "";
+  DOMString addonId = "";
+  DOMString level = "";
+  DOMString filename = "";
+  unsigned long lineNumber = 0;
+  unsigned long columnNumber = 0;
+  DOMString functionName = "";
+  double timeStamp = 0;
+  sequence<any> arguments;
+  sequence<DOMString?> styles;
+  boolean private = false;
+  // stacktrace is handled via a getter in some cases so we can construct it
+  // lazily.  Note that we're not making this whole thing an interface because
+  // consumers expect to see own properties on it, which would mean making the
+  // props unforgeable, which means lots of JSFunction allocations.  Maybe we
+  // should fix those consumers, of course....
+  // sequence<ConsoleStackEntry> stacktrace;
+  DOMString groupName = "";
+  any timer = null;
+  any counter = null;
+  DOMString prefix = "";
+};
+
+// Event for profile operations
+dictionary ConsoleProfileEvent {
+  DOMString action = "";
+  sequence<any> arguments;
+};
+
+// This dictionary is used to manage stack trace data.
+dictionary ConsoleStackEntry {
+  DOMString filename = "";
+  unsigned long lineNumber = 0;
+  unsigned long columnNumber = 0;
+  DOMString functionName = "";
+  DOMString? asyncCause;
+};
+
+dictionary ConsoleTimerStart {
+  DOMString name = "";
+};
+
+dictionary ConsoleTimerLogOrEnd {
+  DOMString name = "";
+  double duration = 0;
+};
+
+dictionary ConsoleTimerError {
+  DOMString error = "";
+  DOMString name = "";
+};
+
+dictionary ConsoleCounter {
+  DOMString label = "";
+  unsigned long count = 0;
+};
+
+dictionary ConsoleCounterError {
+  DOMString label = "";
+  DOMString error = "";
+};
+
+[ChromeOnly,
+ Exposed=(Window,Worker,WorkerDebugger,Worklet,System)]
+// This is basically a copy of the console namespace.
+interface ConsoleInstance {
+  // Logging
+  void assert(optional boolean condition = false, any... data);
+  void clear();
+  void count(optional DOMString label = "default");
+  void countReset(optional DOMString label = "default");
+  void debug(any... data);
+  void error(any... data);
+  void info(any... data);
+  void log(any... data);
+  void table(any... data); // FIXME: The spec is still unclear about this.
+  void trace(any... data);
+  void warn(any... data);
+  void dir(any... data); // FIXME: This doesn't follow the spec yet.
+  void dirxml(any... data);
+
+  // Grouping
+  void group(any... data);
+  void groupCollapsed(any... data);
+  void groupEnd();
+
+  // Timing
+  void time(optional DOMString label = "default");
+  void timeLog(optional DOMString label = "default", any... data);
+  void timeEnd(optional DOMString label = "default");
+
+  // Mozilla only or Webcompat methods
+
+  void _exception(any... data);
+  void timeStamp(optional any data);
+
+  void profile(any... data);
+  void profileEnd(any... data);
+};
+
+callback ConsoleInstanceDumpCallback = void (DOMString message);
+
+enum ConsoleLogLevel {
+  "All", "Debug", "Log", "Info", "Clear", "Trace", "TimeLog", "TimeEnd", "Time",
+  "Group", "GroupEnd", "Profile", "ProfileEnd", "Dir", "Dirxml", "Warn", "Error",
+  "Off"
+};
+
+dictionary ConsoleInstanceOptions {
+  // An optional function to intercept all strings written to stdout.
+  ConsoleInstanceDumpCallback dump;
+
+  // An optional prefix string to be printed before the actual logged message.
+  DOMString prefix = "";
+
+  // An ID representing the source of the message. Normally the inner ID of a
+  // DOM window.
+  DOMString innerID = "";
+
+  // String identified for the console, this will be passed through the console
+  // notifications.
+  DOMString consoleID = "";
+
+  // Identifier that allows to filter which messages are logged based on their
+  // log level.
+  ConsoleLogLevel maxLogLevel;
+
+  // String pref name which contains the level to use for maxLogLevel. If the
+  // pref doesn't exist, gets removed or it is used in workers, the maxLogLevel
+  // will default to the value passed to this constructor (or "all" if it wasn't
+  // specified).
+  DOMString maxLogLevelPref = "";
+};
+
+enum ConsoleLevel { "log", "warning", "error" };
+
+// this interface is just for testing
+partial interface ConsoleInstance {
+  [ChromeOnly]
+  void reportForServiceWorkerScope(DOMString scope, DOMString message,
+                                   DOMString filename, unsigned long lineNumber,
+                                   unsigned long columnNumber,
+                                   ConsoleLevel level);
+};
diff --git a/crates/web-sys/webidls/available/ConstantSourceNode.webidl b/crates/web-sys/webidls/available/ConstantSourceNode.webidl
new file mode 100644
index 00000000..cd005897
--- /dev/null
+++ b/crates/web-sys/webidls/available/ConstantSourceNode.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary ConstantSourceOptions {
+    float offset = 1;
+};
+
+[Pref="dom.webaudio.enabled",
+ Constructor(BaseAudioContext context, optional ConstantSourceOptions options)]
+interface ConstantSourceNode :  AudioScheduledSourceNode {
+    readonly        attribute AudioParam   offset;
+};
diff --git a/crates/web-sys/webidls/available/ConvolverNode.webidl b/crates/web-sys/webidls/available/ConvolverNode.webidl
new file mode 100644
index 00000000..0e0e1137
--- /dev/null
+++ b/crates/web-sys/webidls/available/ConvolverNode.webidl
@@ -0,0 +1,30 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary ConvolverOptions : AudioNodeOptions {
+             AudioBuffer? buffer;
+             boolean      disableNormalization = false;
+};
+
+[Pref="dom.webaudio.enabled",
+ Constructor(BaseAudioContext context, optional ConvolverOptions options)]
+interface ConvolverNode : AudioNode {
+
+      [SetterThrows]
+      attribute AudioBuffer? buffer;
+      attribute boolean normalize;
+
+};
+
+// Mozilla extension
+ConvolverNode implements AudioNodePassThrough;
+
diff --git a/crates/web-sys/webidls/available/Coordinates.webidl b/crates/web-sys/webidls/available/Coordinates.webidl
new file mode 100644
index 00000000..840782f7
--- /dev/null
+++ b/crates/web-sys/webidls/available/Coordinates.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/geolocation-API
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[NoInterfaceObject]
+interface Coordinates {
+  readonly attribute double latitude;
+  readonly attribute double longitude;
+  readonly attribute double? altitude;
+  readonly attribute double accuracy;
+  readonly attribute double? altitudeAccuracy;
+  readonly attribute double? heading;
+  readonly attribute double? speed;
+};
diff --git a/crates/web-sys/webidls/available/CreateOfferRequest.webidl b/crates/web-sys/webidls/available/CreateOfferRequest.webidl
new file mode 100644
index 00000000..134fe33f
--- /dev/null
+++ b/crates/web-sys/webidls/available/CreateOfferRequest.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This is an internal IDL file
+ */
+
+[ChromeOnly,
+ JSImplementation="@mozilla.org/dom/createofferrequest;1"]
+interface CreateOfferRequest {
+  readonly attribute unsigned long long windowID;
+  readonly attribute unsigned long long innerWindowID;
+  readonly attribute DOMString callID;
+  readonly attribute boolean isSecure;
+};
diff --git a/crates/web-sys/webidls/available/CredentialManagement.webidl b/crates/web-sys/webidls/available/CredentialManagement.webidl
new file mode 100644
index 00000000..fcb52507
--- /dev/null
+++ b/crates/web-sys/webidls/available/CredentialManagement.webidl
@@ -0,0 +1,36 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://www.w3.org/TR/credential-management-1/
+ */
+
+[Exposed=Window, SecureContext, Pref="security.webauth.webauthn"]
+interface Credential {
+  readonly attribute USVString id;
+  readonly attribute DOMString type;
+};
+
+[Exposed=Window, SecureContext, Pref="security.webauth.webauthn"]
+interface CredentialsContainer {
+  [Throws]
+  Promise<Credential?> get(optional CredentialRequestOptions options);
+  [Throws]
+  Promise<Credential?> create(optional CredentialCreationOptions options);
+  [Throws]
+  Promise<Credential> store(Credential credential);
+  [Throws]
+  Promise<void> preventSilentAccess();
+};
+
+dictionary CredentialRequestOptions {
+  PublicKeyCredentialRequestOptions publicKey;
+  AbortSignal signal;
+};
+
+dictionary CredentialCreationOptions {
+  PublicKeyCredentialCreationOptions publicKey;
+  AbortSignal signal;
+};
diff --git a/crates/web-sys/webidls/available/Crypto.webidl b/crates/web-sys/webidls/available/Crypto.webidl
new file mode 100644
index 00000000..31574a21
--- /dev/null
+++ b/crates/web-sys/webidls/available/Crypto.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/webcrypto-api/raw-file/tip/spec/Overview.html#crypto-interface
+ */
+
+[NoInterfaceObject, Exposed=(Window,Worker)]
+interface GlobalCrypto {
+  [Throws] readonly attribute Crypto crypto;
+};
+
+[Exposed=(Window,Worker)]
+interface Crypto {
+  readonly attribute SubtleCrypto subtle;
+
+  [Throws]
+  ArrayBufferView getRandomValues(ArrayBufferView array);
+};
diff --git a/crates/web-sys/webidls/available/CustomElementRegistry.webidl b/crates/web-sys/webidls/available/CustomElementRegistry.webidl
new file mode 100644
index 00000000..b4b091b8
--- /dev/null
+++ b/crates/web-sys/webidls/available/CustomElementRegistry.webidl
@@ -0,0 +1,23 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// https://html.spec.whatwg.org/#dom-window-customelements
+[Func="CustomElementRegistry::IsCustomElementEnabled"]
+interface CustomElementRegistry {
+  [CEReactions, Throws]
+  void define(DOMString name, Function functionConstructor,
+              optional ElementDefinitionOptions options);
+  [ChromeOnly, Throws]
+  void setElementCreationCallback(DOMString name, CustomElementCreationCallback callback);
+  any get(DOMString name);
+  [Throws]
+  Promise<void> whenDefined(DOMString name);
+  [CEReactions] void upgrade(Node root);
+};
+
+dictionary ElementDefinitionOptions {
+  DOMString extends;
+};
+
+callback CustomElementCreationCallback = void (DOMString name);
diff --git a/crates/web-sys/webidls/available/CustomEvent.webidl b/crates/web-sys/webidls/available/CustomEvent.webidl
new file mode 100644
index 00000000..8c7124dd
--- /dev/null
+++ b/crates/web-sys/webidls/available/CustomEvent.webidl
@@ -0,0 +1,29 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/2012/WD-dom-20120105/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Constructor(DOMString type, optional CustomEventInit eventInitDict),
+ Exposed=(Window, Worker)]
+interface CustomEvent : Event
+{
+  readonly attribute any detail;
+
+  // initCustomEvent is a Gecko specific deprecated method.
+  void initCustomEvent(DOMString type,
+                       optional boolean canBubble = false,
+                       optional boolean cancelable = false,
+                       optional any detail = null);
+};
+
+dictionary CustomEventInit : EventInit
+{
+  any detail = null;
+};
diff --git a/crates/web-sys/webidls/available/DOMError.webidl b/crates/web-sys/webidls/available/DOMError.webidl
new file mode 100644
index 00000000..5fb5d17e
--- /dev/null
+++ b/crates/web-sys/webidls/available/DOMError.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dom.spec.whatwg.org/#domerror
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Constructor(DOMString name, optional DOMString message = ""),
+ Exposed=(Window,Worker,System)]
+interface DOMError {
+  [Constant, UseCounter]
+  readonly attribute DOMString name;
+
+  [Constant, UseCounter]
+  readonly attribute DOMString message;
+};
diff --git a/crates/web-sys/webidls/available/DOMException.webidl b/crates/web-sys/webidls/available/DOMException.webidl
new file mode 100644
index 00000000..157e5cdc
--- /dev/null
+++ b/crates/web-sys/webidls/available/DOMException.webidl
@@ -0,0 +1,107 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dom.spec.whatwg.org/#exception-domexception
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+
+// This is the WebIDL version of nsIException.  This is mostly legacy stuff.
+
+interface StackFrame;
+
+[NoInterfaceObject,
+ Exposed=(Window,Worker,System)]
+interface ExceptionMembers
+{
+  // The nsresult associated with this exception.
+  readonly attribute unsigned long           result;
+
+  // Filename location.  This is the location that caused the
+  // error, which may or may not be a source file location.
+  // For example, standard language errors would generally have
+  // the same location as their top stack entry.  File
+  // parsers may put the location of the file they were parsing,
+  // etc.
+
+  // null indicates "no data"
+  readonly attribute DOMString               filename;
+  // Valid line numbers begin at '1'. '0' indicates unknown.
+  readonly attribute unsigned long           lineNumber;
+  // Valid column numbers begin at 0. 
+  // We don't have an unambiguous indicator for unknown.
+  readonly attribute unsigned long           columnNumber;
+
+  // A stack trace, if available.  nsIStackFrame does not have classinfo so
+  // this was only ever usefully available to chrome JS.
+  [ChromeOnly, Exposed=Window]
+  readonly attribute StackFrame?             location;
+
+  // Arbitary data for the implementation.
+  [Exposed=Window]
+  readonly attribute nsISupports?            data;
+
+  // Formatted exception stack
+  [Replaceable]
+  readonly attribute DOMString               stack;
+};
+
+[NoInterfaceObject, Exposed=(Window,Worker)]
+interface Exception {
+  // The name of the error code (ie, a string repr of |result|).
+  readonly attribute DOMString               name;
+  // A custom message set by the thrower.
+  readonly attribute DOMString               message;
+  // A generic formatter - make it suitable to print, etc.
+  stringifier;
+};
+
+Exception implements ExceptionMembers;
+
+// XXXkhuey this is an 'exception', not an interface, but we don't have any
+// parser or codegen mechanisms for dealing with exceptions.
+[ExceptionClass,
+ Exposed=(Window, Worker,System),
+ Constructor(optional DOMString message = "", optional DOMString name)]
+interface DOMException {
+  // The name of the error code (ie, a string repr of |result|).
+  readonly attribute DOMString               name;
+  // A custom message set by the thrower.
+  readonly attribute DOMString               message;
+  readonly attribute unsigned short code;
+
+  const unsigned short INDEX_SIZE_ERR = 1;
+  const unsigned short DOMSTRING_SIZE_ERR = 2; // historical
+  const unsigned short HIERARCHY_REQUEST_ERR = 3;
+  const unsigned short WRONG_DOCUMENT_ERR = 4;
+  const unsigned short INVALID_CHARACTER_ERR = 5;
+  const unsigned short NO_DATA_ALLOWED_ERR = 6; // historical
+  const unsigned short NO_MODIFICATION_ALLOWED_ERR = 7;
+  const unsigned short NOT_FOUND_ERR = 8;
+  const unsigned short NOT_SUPPORTED_ERR = 9;
+  const unsigned short INUSE_ATTRIBUTE_ERR = 10; // historical
+  const unsigned short INVALID_STATE_ERR = 11;
+  const unsigned short SYNTAX_ERR = 12;
+  const unsigned short INVALID_MODIFICATION_ERR = 13;
+  const unsigned short NAMESPACE_ERR = 14;
+  const unsigned short INVALID_ACCESS_ERR = 15;
+  const unsigned short VALIDATION_ERR = 16; // historical
+  const unsigned short TYPE_MISMATCH_ERR = 17; // historical; use JavaScript's TypeError instead
+  const unsigned short SECURITY_ERR = 18;
+  const unsigned short NETWORK_ERR = 19;
+  const unsigned short ABORT_ERR = 20;
+  const unsigned short URL_MISMATCH_ERR = 21;
+  const unsigned short QUOTA_EXCEEDED_ERR = 22;
+  const unsigned short TIMEOUT_ERR = 23;
+  const unsigned short INVALID_NODE_TYPE_ERR = 24;
+  const unsigned short DATA_CLONE_ERR = 25;
+};
+
+// XXXkhuey copy all of Gecko's non-standard stuff onto DOMException, but leave
+// the prototype chain sane.
+DOMException implements ExceptionMembers;
diff --git a/crates/web-sys/webidls/available/DOMImplementation.webidl b/crates/web-sys/webidls/available/DOMImplementation.webidl
new file mode 100644
index 00000000..5fa3c859
--- /dev/null
+++ b/crates/web-sys/webidls/available/DOMImplementation.webidl
@@ -0,0 +1,26 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dom.spec.whatwg.org/#interface-domimplementation
+ *
+ * Copyright:
+ * To the extent possible under law, the editors have waived all copyright and
+ * related or neighboring rights to this work.
+ */
+
+interface DOMImplementation {
+  boolean hasFeature();
+
+  [Throws]
+  DocumentType createDocumentType(DOMString qualifiedName, DOMString publicId,
+                                  DOMString systemId);
+  [Throws]
+  Document createDocument(DOMString? namespace,
+                          [TreatNullAs=EmptyString] DOMString qualifiedName,
+                          optional DocumentType? doctype = null);
+  [Throws]
+  Document createHTMLDocument(optional DOMString title);
+};
diff --git a/crates/web-sys/webidls/available/DOMMatrix.webidl b/crates/web-sys/webidls/available/DOMMatrix.webidl
new file mode 100644
index 00000000..06a0da44
--- /dev/null
+++ b/crates/web-sys/webidls/available/DOMMatrix.webidl
@@ -0,0 +1,150 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/fxtf/geometry/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="layout.css.DOMMatrix.enabled",
+ Constructor(optional (DOMString or sequence<unrestricted double>) init)]
+interface DOMMatrixReadOnly {
+    // These attributes are simple aliases for certain elements of the 4x4 matrix
+    readonly attribute unrestricted double a;
+    readonly attribute unrestricted double b;
+    readonly attribute unrestricted double c;
+    readonly attribute unrestricted double d;
+    readonly attribute unrestricted double e;
+    readonly attribute unrestricted double f;
+
+    readonly attribute unrestricted double m11;
+    readonly attribute unrestricted double m12;
+    readonly attribute unrestricted double m13;
+    readonly attribute unrestricted double m14;
+    readonly attribute unrestricted double m21;
+    readonly attribute unrestricted double m22;
+    readonly attribute unrestricted double m23;
+    readonly attribute unrestricted double m24;
+    readonly attribute unrestricted double m31;
+    readonly attribute unrestricted double m32;
+    readonly attribute unrestricted double m33;
+    readonly attribute unrestricted double m34;
+    readonly attribute unrestricted double m41;
+    readonly attribute unrestricted double m42;
+    readonly attribute unrestricted double m43;
+    readonly attribute unrestricted double m44;
+
+    // Immutable transform methods
+    DOMMatrix translate(unrestricted double tx,
+                        unrestricted double ty,
+                        optional unrestricted double tz = 0);
+    DOMMatrix scale(unrestricted double scale,
+                    optional unrestricted double originX = 0,
+                    optional unrestricted double originY = 0);
+    DOMMatrix scale3d(unrestricted double scale,
+                      optional unrestricted double originX = 0,
+                      optional unrestricted double originY = 0,
+                      optional unrestricted double originZ = 0);
+    DOMMatrix scaleNonUniform(unrestricted double scaleX,
+                              optional unrestricted double scaleY = 1,
+                              optional unrestricted double scaleZ = 1,
+                              optional unrestricted double originX = 0,
+                              optional unrestricted double originY = 0,
+                              optional unrestricted double originZ = 0);
+    DOMMatrix rotate(unrestricted double angle,
+                     optional unrestricted double originX = 0,
+                     optional unrestricted double originY = 0);
+    DOMMatrix rotateFromVector(unrestricted double x,
+                               unrestricted double y);
+    DOMMatrix rotateAxisAngle(unrestricted double x,
+                              unrestricted double y,
+                              unrestricted double z,
+                              unrestricted double angle);
+    DOMMatrix skewX(unrestricted double sx);
+    DOMMatrix skewY(unrestricted double sy);
+    DOMMatrix multiply(DOMMatrix other);
+    DOMMatrix flipX();
+    DOMMatrix flipY();
+    DOMMatrix inverse();
+
+    // Helper methods
+    readonly attribute boolean is2D;
+    readonly attribute boolean isIdentity;
+    DOMPoint                   transformPoint(optional DOMPointInit point);
+    [Throws] Float32Array      toFloat32Array();
+    [Throws] Float64Array      toFloat64Array();
+                               stringifier;
+    [Default] object           toJSON();
+};
+
+[Pref="layout.css.DOMMatrix.enabled",
+ Constructor,
+ Constructor(DOMString transformList),
+ Constructor(DOMMatrixReadOnly other),
+ Constructor(Float32Array array32),
+ Constructor(Float64Array array64),
+ Constructor(sequence<unrestricted double> numberSequence)]
+interface DOMMatrix : DOMMatrixReadOnly {
+    // These attributes are simple aliases for certain elements of the 4x4 matrix
+    inherit attribute unrestricted double a;
+    inherit attribute unrestricted double b;
+    inherit attribute unrestricted double c;
+    inherit attribute unrestricted double d;
+    inherit attribute unrestricted double e;
+    inherit attribute unrestricted double f;
+
+    inherit attribute unrestricted double m11;
+    inherit attribute unrestricted double m12;
+    inherit attribute unrestricted double m13;
+    inherit attribute unrestricted double m14;
+    inherit attribute unrestricted double m21;
+    inherit attribute unrestricted double m22;
+    inherit attribute unrestricted double m23;
+    inherit attribute unrestricted double m24;
+    inherit attribute unrestricted double m31;
+    inherit attribute unrestricted double m32;
+    inherit attribute unrestricted double m33;
+    inherit attribute unrestricted double m34;
+    inherit attribute unrestricted double m41;
+    inherit attribute unrestricted double m42;
+    inherit attribute unrestricted double m43;
+    inherit attribute unrestricted double m44;
+
+    // Mutable transform methods
+    DOMMatrix multiplySelf(DOMMatrix other);
+    DOMMatrix preMultiplySelf(DOMMatrix other);
+    DOMMatrix translateSelf(unrestricted double tx,
+                            unrestricted double ty,
+                            optional unrestricted double tz = 0);
+    DOMMatrix scaleSelf(unrestricted double scale,
+                        optional unrestricted double originX = 0,
+                        optional unrestricted double originY = 0);
+    DOMMatrix scale3dSelf(unrestricted double scale,
+                          optional unrestricted double originX = 0,
+                          optional unrestricted double originY = 0,
+                          optional unrestricted double originZ = 0);
+    DOMMatrix scaleNonUniformSelf(unrestricted double scaleX,
+                                  optional unrestricted double scaleY = 1,
+                                  optional unrestricted double scaleZ = 1,
+                                  optional unrestricted double originX = 0,
+                                  optional unrestricted double originY = 0,
+                                  optional unrestricted double originZ = 0);
+    DOMMatrix rotateSelf(unrestricted double angle,
+                         optional unrestricted double originX = 0,
+                         optional unrestricted double originY = 0);
+    DOMMatrix rotateFromVectorSelf(unrestricted double x,
+                                  unrestricted double y);
+    DOMMatrix rotateAxisAngleSelf(unrestricted double x,
+                                  unrestricted double y,
+                                  unrestricted double z,
+                                  unrestricted double angle);
+    DOMMatrix skewXSelf(unrestricted double sx);
+    DOMMatrix skewYSelf(unrestricted double sy);
+    DOMMatrix invertSelf();
+    [Throws] DOMMatrix setMatrixValue(DOMString transformList);
+};
+
diff --git a/crates/web-sys/webidls/available/DOMParser.webidl b/crates/web-sys/webidls/available/DOMParser.webidl
new file mode 100644
index 00000000..8afff03d
--- /dev/null
+++ b/crates/web-sys/webidls/available/DOMParser.webidl
@@ -0,0 +1,40 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://domparsing.spec.whatwg.org/#the-domparser-interface
+ */
+
+interface Principal;
+interface URI;
+interface InputStream;
+
+enum SupportedType {
+  "text/html",
+  "text/xml",
+  "application/xml",
+  "application/xhtml+xml",
+  "image/svg+xml"
+};
+
+// the latter is Mozilla-specific
+[Constructor]
+interface DOMParser {
+  [NewObject, Throws]
+  Document parseFromString(DOMString str, SupportedType type);
+
+  // Mozilla-specific stuff
+  [NewObject, Throws, ChromeOnly]
+  Document parseFromBuffer(sequence<octet> buf, SupportedType type);
+  [NewObject, Throws, ChromeOnly]
+  Document parseFromBuffer(Uint8Array buf, SupportedType type);
+  [NewObject, Throws, ChromeOnly]
+  Document parseFromStream(InputStream stream, DOMString? charset,
+                           long contentLength, SupportedType type);
+  // Can be used to allow a DOMParser to parse XUL/XBL no matter what
+  // principal it's using for the document.
+  [ChromeOnly]
+  void forceEnableXULXBL();
+};
+
diff --git a/crates/web-sys/webidls/available/DOMPoint.webidl b/crates/web-sys/webidls/available/DOMPoint.webidl
new file mode 100644
index 00000000..2ebba958
--- /dev/null
+++ b/crates/web-sys/webidls/available/DOMPoint.webidl
@@ -0,0 +1,44 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/fxtf/geometry/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="layout.css.DOMPoint.enabled",
+ Constructor(optional unrestricted double x = 0, optional unrestricted double y = 0,
+             optional unrestricted double z = 0, optional unrestricted double w = 1)]
+interface DOMPointReadOnly {
+    [NewObject] static DOMPointReadOnly fromPoint(optional DOMPointInit other);
+
+    readonly attribute unrestricted double x;
+    readonly attribute unrestricted double y;
+    readonly attribute unrestricted double z;
+    readonly attribute unrestricted double w; 
+
+    [Default] object toJSON();
+};
+
+[Pref="layout.css.DOMPoint.enabled",
+ Constructor(optional unrestricted double x = 0, optional unrestricted double y = 0,
+             optional unrestricted double z = 0, optional unrestricted double w = 1)]
+interface DOMPoint : DOMPointReadOnly {
+    [NewObject] static DOMPoint fromPoint(optional DOMPointInit other);
+
+    inherit attribute unrestricted double x;
+    inherit attribute unrestricted double y;
+    inherit attribute unrestricted double z;
+    inherit attribute unrestricted double w;
+};
+
+dictionary DOMPointInit {
+    unrestricted double x = 0;
+    unrestricted double y = 0;
+    unrestricted double z = 0;
+    unrestricted double w = 1;
+};
diff --git a/crates/web-sys/webidls/available/DOMQuad.webidl b/crates/web-sys/webidls/available/DOMQuad.webidl
new file mode 100644
index 00000000..7370330b
--- /dev/null
+++ b/crates/web-sys/webidls/available/DOMQuad.webidl
@@ -0,0 +1,41 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/fxtf/geometry/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="layout.css.DOMQuad.enabled",
+ Constructor(optional DOMPointInit p1, optional DOMPointInit p2,
+             optional DOMPointInit p3, optional DOMPointInit p4),
+ Constructor(DOMRectReadOnly rect)]
+interface DOMQuad {
+    [SameObject] readonly attribute DOMPoint p1;
+    [SameObject] readonly attribute DOMPoint p2;
+    [SameObject] readonly attribute DOMPoint p3;
+    [SameObject] readonly attribute DOMPoint p4;
+    [NewObject] DOMRectReadOnly getBounds();
+
+    [SameObject, Deprecated=DOMQuadBoundsAttr] readonly attribute DOMRectReadOnly bounds;
+
+    DOMQuadJSON toJSON();
+};
+
+dictionary DOMQuadJSON {
+    DOMPoint p1;
+    DOMPoint p2;
+    DOMPoint p3;
+    DOMPoint p4;
+};
+
+dictionary DOMQuadInit {
+    DOMPointInit p1;
+    DOMPointInit p2;
+    DOMPointInit p3;
+    DOMPointInit p4;
+};
diff --git a/crates/web-sys/webidls/available/DOMRect.webidl b/crates/web-sys/webidls/available/DOMRect.webidl
new file mode 100644
index 00000000..b9261ecc
--- /dev/null
+++ b/crates/web-sys/webidls/available/DOMRect.webidl
@@ -0,0 +1,43 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/fxtf/geometry/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Constructor(optional unrestricted double x = 0, optional unrestricted double y = 0,
+             optional unrestricted double width = 0, optional unrestricted double height = 0)]
+interface DOMRect : DOMRectReadOnly {
+    inherit attribute unrestricted double x;
+    inherit attribute unrestricted double y;
+    inherit attribute unrestricted double width;
+    inherit attribute unrestricted double height;
+};
+
+[ProbablyShortLivingWrapper,
+ Constructor(optional unrestricted double x = 0, optional unrestricted double y = 0,
+             optional unrestricted double width = 0, optional unrestricted double height = 0)]
+interface DOMRectReadOnly {
+    readonly attribute unrestricted double x;
+    readonly attribute unrestricted double y;
+    readonly attribute unrestricted double width;
+    readonly attribute unrestricted double height;
+    readonly attribute unrestricted double top;
+    readonly attribute unrestricted double right;
+    readonly attribute unrestricted double bottom;
+    readonly attribute unrestricted double left;
+
+    [Default] object toJSON();
+};
+
+dictionary DOMRectInit {
+    unrestricted double x = 0;
+    unrestricted double y = 0;
+    unrestricted double width = 0;
+    unrestricted double height = 0;
+};
diff --git a/crates/web-sys/webidls/available/DOMRectList.webidl b/crates/web-sys/webidls/available/DOMRectList.webidl
new file mode 100644
index 00000000..74332bfc
--- /dev/null
+++ b/crates/web-sys/webidls/available/DOMRectList.webidl
@@ -0,0 +1,10 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+interface DOMRectList {
+  readonly attribute unsigned long length;
+  getter DOMRect? item(unsigned long index);
+};
diff --git a/crates/web-sys/webidls/available/DOMRequest.webidl b/crates/web-sys/webidls/available/DOMRequest.webidl
new file mode 100644
index 00000000..2e25fc19
--- /dev/null
+++ b/crates/web-sys/webidls/available/DOMRequest.webidl
@@ -0,0 +1,32 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+enum DOMRequestReadyState { "pending", "done" };
+
+[Exposed=(Window,Worker,System), NoInterfaceObject]
+interface DOMRequestShared {
+  readonly attribute DOMRequestReadyState readyState;
+
+  readonly attribute any result;
+  readonly attribute DOMException? error;
+
+  attribute EventHandler onsuccess;
+  attribute EventHandler onerror;
+};
+
+[Exposed=(Window,Worker,System)]
+interface DOMRequest : EventTarget {
+  // The [TreatNonCallableAsNull] annotation is required since then() should do
+  // nothing instead of throwing errors when non-callable arguments are passed.
+  // See documentation for Promise.then to see why we return "any".
+  [NewObject, Throws]
+  any then([TreatNonCallableAsNull] optional AnyCallback? fulfillCallback = null,
+           [TreatNonCallableAsNull] optional AnyCallback? rejectCallback = null);
+
+  [ChromeOnly]
+  void fireDetailedError(DOMException aError);
+};
+
+DOMRequest implements DOMRequestShared;
diff --git a/crates/web-sys/webidls/available/DOMStringList.webidl b/crates/web-sys/webidls/available/DOMStringList.webidl
new file mode 100644
index 00000000..56c5836f
--- /dev/null
+++ b/crates/web-sys/webidls/available/DOMStringList.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/2012/WD-dom-20120105/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=(Window,Worker,System)]
+interface DOMStringList {
+  readonly attribute unsigned long length;
+  getter DOMString? item(unsigned long index);
+  boolean contains(DOMString string);
+};
diff --git a/crates/web-sys/webidls/available/DOMStringMap.webidl b/crates/web-sys/webidls/available/DOMStringMap.webidl
new file mode 100644
index 00000000..e86e37a3
--- /dev/null
+++ b/crates/web-sys/webidls/available/DOMStringMap.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/multipage/common-dom-interfaces.html#domstringmap-0
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[OverrideBuiltins]
+interface DOMStringMap {
+  getter DOMString (DOMString name);
+  [CEReactions, Throws]
+  setter void (DOMString name, DOMString value);
+  [CEReactions]
+  deleter void (DOMString name);
+};
diff --git a/crates/web-sys/webidls/available/DOMTokenList.webidl b/crates/web-sys/webidls/available/DOMTokenList.webidl
new file mode 100644
index 00000000..a662300d
--- /dev/null
+++ b/crates/web-sys/webidls/available/DOMTokenList.webidl
@@ -0,0 +1,31 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/2012/WD-dom-20120105/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface DOMTokenList {
+  readonly attribute unsigned long length;
+  getter DOMString? item(unsigned long index);
+  boolean contains(DOMString token);
+  [CEReactions, Throws]
+  void add(DOMString... tokens);
+  [CEReactions, Throws]
+  void remove(DOMString... tokens);
+  [CEReactions, Throws]
+  boolean replace(DOMString token, DOMString newToken);
+  [CEReactions, Throws]
+  boolean toggle(DOMString token, optional boolean force);
+  [Throws]
+  boolean supports(DOMString token);
+  [CEReactions, SetterThrows]
+  attribute DOMString value;
+  stringifier DOMString ();
+  iterable<DOMString?>;
+};
diff --git a/crates/web-sys/webidls/available/DataTransfer.webidl b/crates/web-sys/webidls/available/DataTransfer.webidl
new file mode 100644
index 00000000..0fbec23a
--- /dev/null
+++ b/crates/web-sys/webidls/available/DataTransfer.webidl
@@ -0,0 +1,178 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is:
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-datatransfer-interface
+ */
+
+[Constructor]
+interface DataTransfer {
+           attribute DOMString dropEffect;
+           attribute DOMString effectAllowed;
+
+  readonly attribute DataTransferItemList items;
+
+  void setDragImage(Element image, long x, long y);
+
+  // ReturnValueNeedsContainsHack on .types because lots of extension
+  // code was expecting .contains() back when it was a DOMStringList.
+  [Pure, Cached, Frozen, NeedsCallerType, ReturnValueNeedsContainsHack]
+  readonly attribute sequence<DOMString> types;
+  [Throws, NeedsSubjectPrincipal]
+  DOMString getData(DOMString format);
+  [Throws, NeedsSubjectPrincipal]
+  void setData(DOMString format, DOMString data);
+  [Throws, NeedsSubjectPrincipal]
+  void clearData(optional DOMString format);
+  [NeedsSubjectPrincipal]
+  readonly attribute FileList? files;
+};
+
+partial interface DataTransfer {
+  [Throws, Pref="dom.input.dirpicker", NeedsSubjectPrincipal]
+  Promise<sequence<(File or Directory)>> getFilesAndDirectories();
+
+  [Throws, Pref="dom.input.dirpicker", NeedsSubjectPrincipal]
+  Promise<sequence<File>>                getFiles(optional boolean recursiveFlag = false);
+};
+
+// Mozilla specific stuff
+partial interface DataTransfer {
+  /*
+   * Set the drag source. Usually you would not change this, but it will
+   * affect which node the drag and dragend events are fired at. The
+   * default target is the node that was dragged.
+   *
+   * @param element drag source to use
+   * @throws NO_MODIFICATION_ALLOWED_ERR if the item cannot be modified
+   */
+  [Throws, UseCounter]
+  void addElement(Element element);
+
+  /**
+   * The number of items being dragged.
+   */
+  [UseCounter]
+  readonly attribute unsigned long mozItemCount;
+
+  /**
+   * Sets the drag cursor state. Primarily used to control the cursor during
+   * tab drags, but could be expanded to other uses. XXX Currently implemented
+   * on Win32 only.
+   *
+   * Possible values:
+   *  auto - use default system behavior.
+   *  default - set the cursor to an arrow during the drag operation.
+   *
+   * Values other than 'default' are indentical to setting mozCursor to
+   * 'auto'.
+   */
+  [UseCounter]
+  attribute DOMString mozCursor;
+
+  /**
+   * Holds a list of the format types of the data that is stored for an item
+   * at the specified index. If the index is not in the range from 0 to
+   * itemCount - 1, an empty string list is returned.
+   */
+  [Throws, NeedsCallerType, UseCounter]
+  DOMStringList mozTypesAt(unsigned long index);
+
+  /**
+   * Remove the data associated with the given format for an item at the
+   * specified index. The index is in the range from zero to itemCount - 1.
+   *
+   * If the last format for the item is removed, the entire item is removed,
+   * reducing the itemCount by one.
+   *
+   * If format is empty, then the data associated with all formats is removed.
+   * If the format is not found, then this method has no effect.
+   *
+   * @param format the format to remove
+   * @throws NS_ERROR_DOM_INDEX_SIZE_ERR if index is greater or equal than itemCount
+   * @throws NO_MODIFICATION_ALLOWED_ERR if the item cannot be modified
+   */
+  [Throws, NeedsSubjectPrincipal, UseCounter]
+  void mozClearDataAt(DOMString format, unsigned long index);
+
+  /*
+   * A data transfer may store multiple items, each at a given zero-based
+   * index. setDataAt may only be called with an index argument less than
+   * itemCount in which case an existing item is modified, or equal to
+   * itemCount in which case a new item is added, and the itemCount is
+   * incremented by one.
+   *
+   * Data should be added in order of preference, with the most specific
+   * format added first and the least specific format added last. If data of
+   * the given format already exists, it is replaced in the same position as
+   * the old data.
+   *
+   * The data should be either a string, a primitive boolean or number type
+   * (which will be converted into a string) or an nsISupports.
+   *
+   * @param format the format to add
+   * @param data the data to add
+   * @throws NS_ERROR_NULL_POINTER if the data is null
+   * @throws NS_ERROR_DOM_INDEX_SIZE_ERR if index is greater than itemCount
+   * @throws NO_MODIFICATION_ALLOWED_ERR if the item cannot be modified
+   */
+  [Throws, NeedsSubjectPrincipal, UseCounter]
+  void mozSetDataAt(DOMString format, any data, unsigned long index);
+
+  /**
+   * Retrieve the data associated with the given format for an item at the
+   * specified index, or null if it does not exist. The index should be in the
+   * range from zero to itemCount - 1.
+   *
+   * @param format the format of the data to look up
+   * @returns the data of the given format, or null if it doesn't exist.
+   * @throws NS_ERROR_DOM_INDEX_SIZE_ERR if index is greater or equal than itemCount
+   */
+  [Throws, NeedsSubjectPrincipal, UseCounter]
+  any mozGetDataAt(DOMString format, unsigned long index);
+
+  /**
+   * Update the drag image. Arguments are the same as setDragImage. This is only
+   * valid within the parent chrome process.
+   */
+  [ChromeOnly]
+  void updateDragImage(Element image, long x, long y);
+
+  /**
+   * Will be true when the user has cancelled the drag (typically by pressing
+   * Escape) and when the drag has been cancelled unexpectedly.  This will be
+   * false otherwise, including when the drop has been rejected by its target.
+   * This property is only relevant for the dragend event.
+   */
+  [UseCounter]
+  readonly attribute boolean mozUserCancelled;
+
+  /**
+   * The node that the mouse was pressed over to begin the drag. For external
+   * drags, or if the caller cannot access this node, this will be null.
+   */
+  [UseCounter]
+  readonly attribute Node? mozSourceNode;
+
+  /**
+   * The URI spec of the triggering principal.  This may be different than
+   * sourceNode's principal when sourceNode is xul:browser and the drag is
+   * triggered in a browsing context inside it.
+   */
+  [ChromeOnly]
+  readonly attribute DOMString mozTriggeringPrincipalURISpec;
+
+  /**
+   * Copy the given DataTransfer for the given event. Used by testing code for
+   * creating emulated Drag and Drop events in the UI.
+   *
+   * NOTE: Don't expose a DataTransfer produced with this method to the web or
+   * use this for non-testing purposes. It can easily be used to get the
+   * DataTransfer into an invalid state, and is an unstable implementation
+   * detail of EventUtils.synthesizeDrag.
+   */
+  [Throws, ChromeOnly]
+  DataTransfer mozCloneForEvent(DOMString event);
+};
diff --git a/crates/web-sys/webidls/available/DataTransferItem.webidl b/crates/web-sys/webidls/available/DataTransferItem.webidl
new file mode 100644
index 00000000..44949810
--- /dev/null
+++ b/crates/web-sys/webidls/available/DataTransferItem.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is:
+ * https://html.spec.whatwg.org/multipage/interaction.html#the-datatransferitem-interface
+ */
+
+interface DataTransferItem {
+  readonly attribute DOMString kind;
+  readonly attribute DOMString type;
+  [Throws, NeedsSubjectPrincipal]
+  void getAsString(FunctionStringCallback? _callback);
+  [Throws, NeedsSubjectPrincipal]
+  File? getAsFile();
+};
+
+callback FunctionStringCallback = void (DOMString data);
+
+partial interface DataTransferItem {
+  [Pref="dom.webkitBlink.filesystem.enabled", BinaryName="getAsEntry", Throws,
+   NeedsSubjectPrincipal]
+  FileSystemEntry? webkitGetAsEntry();
+};
diff --git a/crates/web-sys/webidls/available/DataTransferItemList.webidl b/crates/web-sys/webidls/available/DataTransferItemList.webidl
new file mode 100644
index 00000000..079afdd1
--- /dev/null
+++ b/crates/web-sys/webidls/available/DataTransferItemList.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is:
+ * https://html.spec.whatwg.org/multipage/interaction.html#the-datatransferitemlist-interface
+ */
+
+interface DataTransferItemList {
+  readonly attribute unsigned long length;
+  getter DataTransferItem (unsigned long index);
+  [Throws, NeedsSubjectPrincipal]
+  DataTransferItem? add(DOMString data, DOMString type);
+  [Throws, NeedsSubjectPrincipal]
+  DataTransferItem? add(File data);
+  [Throws, NeedsSubjectPrincipal]
+  void remove(unsigned long index);
+  [Throws, NeedsSubjectPrincipal]
+  void clear();
+};
diff --git a/crates/web-sys/webidls/available/DecoderDoctorNotification.webidl b/crates/web-sys/webidls/available/DecoderDoctorNotification.webidl
new file mode 100644
index 00000000..c994918b
--- /dev/null
+++ b/crates/web-sys/webidls/available/DecoderDoctorNotification.webidl
@@ -0,0 +1,31 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+enum DecoderDoctorNotificationType {
+  "cannot-play",
+  "platform-decoder-not-found",
+  "can-play-but-some-missing-decoders",
+  "cannot-initialize-pulseaudio",
+  "unsupported-libavcodec",
+  "decode-error",
+  "decode-warning",
+};
+
+dictionary DecoderDoctorNotification {
+  required DecoderDoctorNotificationType type;
+  // True when the issue has been solved.
+  required boolean isSolved;
+  // Key from dom.properties, used for telemetry and prefs.
+  required DOMString decoderDoctorReportId;
+  // If provided, formats (or key systems) at issue.
+  DOMString formats;
+  // If provided, technical details about the decode-error/warning.
+  DOMString decodeIssue;
+  // If provided, URL of the document where the issue happened.
+  DOMString docURL;
+  // If provided, URL of the media resource that caused a decode-error/warning.
+  DOMString resourceURL;
+};
diff --git a/crates/web-sys/webidls/available/DedicatedWorkerGlobalScope.webidl b/crates/web-sys/webidls/available/DedicatedWorkerGlobalScope.webidl
new file mode 100644
index 00000000..57b48839
--- /dev/null
+++ b/crates/web-sys/webidls/available/DedicatedWorkerGlobalScope.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/multipage/workers.html#the-workerglobalscope-common-interface
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and Opera
+ * Software ASA.
+ * You are granted a license to use, reproduce and create derivative works of
+ * this document.
+ */
+
+[Global=(Worker,DedicatedWorker),
+ Exposed=DedicatedWorker]
+interface DedicatedWorkerGlobalScope : WorkerGlobalScope {
+  [Replaceable]
+  readonly attribute DOMString name;
+
+  [Throws]
+  void postMessage(any message, optional sequence<object> transfer = []);
+
+  void close();
+
+  attribute EventHandler onmessage;
+  attribute EventHandler onmessageerror;
+};
diff --git a/crates/web-sys/webidls/available/DelayNode.webidl b/crates/web-sys/webidls/available/DelayNode.webidl
new file mode 100644
index 00000000..02575bc5
--- /dev/null
+++ b/crates/web-sys/webidls/available/DelayNode.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary DelayOptions : AudioNodeOptions {
+             double maxDelayTime = 1;
+             double delayTime = 0;
+};
+
+[Pref="dom.webaudio.enabled",
+ Constructor(BaseAudioContext context, optional DelayOptions options)]
+interface DelayNode : AudioNode {
+
+    readonly attribute AudioParam delayTime;
+
+};
+
+// Mozilla extension
+DelayNode implements AudioNodePassThrough;
+
diff --git a/crates/web-sys/webidls/available/DeviceLightEvent.webidl b/crates/web-sys/webidls/available/DeviceLightEvent.webidl
new file mode 100644
index 00000000..8b44d2f0
--- /dev/null
+++ b/crates/web-sys/webidls/available/DeviceLightEvent.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Pref="device.sensors.ambientLight.enabled", Func="nsGlobalWindowInner::DeviceSensorsEnabled", Constructor(DOMString type, optional DeviceLightEventInit eventInitDict)]
+interface DeviceLightEvent : Event
+{
+  readonly attribute unrestricted double value;
+};
+
+dictionary DeviceLightEventInit : EventInit
+{
+  unrestricted double value = Infinity;
+};
diff --git a/crates/web-sys/webidls/available/DeviceMotionEvent.webidl b/crates/web-sys/webidls/available/DeviceMotionEvent.webidl
new file mode 100644
index 00000000..851b913e
--- /dev/null
+++ b/crates/web-sys/webidls/available/DeviceMotionEvent.webidl
@@ -0,0 +1,57 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[NoInterfaceObject]
+interface DeviceAcceleration {
+  readonly attribute double? x;
+  readonly attribute double? y;
+  readonly attribute double? z;
+};
+
+[NoInterfaceObject]
+interface DeviceRotationRate {
+  readonly attribute double? alpha;
+  readonly attribute double? beta;
+  readonly attribute double? gamma;
+};
+
+[Pref="device.sensors.motion.enabled", Func="nsGlobalWindowInner::DeviceSensorsEnabled", Constructor(DOMString type, optional DeviceMotionEventInit eventInitDict)]
+interface DeviceMotionEvent : Event {
+  readonly attribute DeviceAcceleration? acceleration;
+  readonly attribute DeviceAcceleration? accelerationIncludingGravity;
+  readonly attribute DeviceRotationRate? rotationRate;
+  readonly attribute double? interval;
+};
+
+dictionary DeviceAccelerationInit {
+  double? x = null;
+  double? y = null;
+  double? z = null;
+};
+
+dictionary DeviceRotationRateInit {
+  double? alpha = null;
+  double? beta = null;
+  double? gamma = null;
+};
+
+dictionary DeviceMotionEventInit : EventInit {
+  DeviceAccelerationInit acceleration;
+  DeviceAccelerationInit accelerationIncludingGravity;
+  DeviceRotationRateInit rotationRate;
+  double? interval = null;
+};
+
+// Mozilla extensions.
+partial interface DeviceMotionEvent {
+  void initDeviceMotionEvent(DOMString type,
+                             optional boolean canBubble = false,
+                             optional boolean cancelable = false,
+                             optional DeviceAccelerationInit acceleration,
+                             optional DeviceAccelerationInit accelerationIncludingGravity,
+                             optional DeviceRotationRateInit rotationRate,
+                             optional double? interval = null);
+};
diff --git a/crates/web-sys/webidls/available/DeviceOrientationEvent.webidl b/crates/web-sys/webidls/available/DeviceOrientationEvent.webidl
new file mode 100644
index 00000000..511add55
--- /dev/null
+++ b/crates/web-sys/webidls/available/DeviceOrientationEvent.webidl
@@ -0,0 +1,31 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Pref="device.sensors.orientation.enabled", Func="nsGlobalWindowInner::DeviceSensorsEnabled", Constructor(DOMString type, optional DeviceOrientationEventInit eventInitDict), LegacyEventInit]
+interface DeviceOrientationEvent : Event
+{
+  readonly attribute double? alpha;
+  readonly attribute double? beta;
+  readonly attribute double? gamma;
+  readonly attribute boolean absolute;
+
+  // initDeviceOrientationEvent is a Gecko specific deprecated method.
+  void initDeviceOrientationEvent(DOMString type,
+                                  optional boolean canBubble = false,
+                                  optional boolean cancelable = false,
+                                  optional double? alpha = null,
+                                  optional double? beta = null,
+                                  optional double? gamma = null,
+                                  optional boolean absolute = false);
+};
+
+dictionary DeviceOrientationEventInit : EventInit
+{
+  double? alpha = null;
+  double? beta = null;
+  double? gamma = null;
+  boolean absolute = false;
+};
diff --git a/crates/web-sys/webidls/available/DeviceProximityEvent.webidl b/crates/web-sys/webidls/available/DeviceProximityEvent.webidl
new file mode 100644
index 00000000..70ee70b3
--- /dev/null
+++ b/crates/web-sys/webidls/available/DeviceProximityEvent.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Pref="device.sensors.proximity.enabled", Func="nsGlobalWindowInner::DeviceSensorsEnabled", Constructor(DOMString type, optional DeviceProximityEventInit eventInitDict)]
+interface DeviceProximityEvent : Event
+{
+  readonly attribute double value;
+  readonly attribute double min;
+  readonly attribute double max;
+};
+
+dictionary DeviceProximityEventInit : EventInit
+{
+  unrestricted double value = Infinity;
+  unrestricted double min = -Infinity;
+  unrestricted double max = Infinity;
+};
diff --git a/crates/web-sys/webidls/available/Directory.webidl b/crates/web-sys/webidls/available/Directory.webidl
new file mode 100644
index 00000000..942d50c7
--- /dev/null
+++ b/crates/web-sys/webidls/available/Directory.webidl
@@ -0,0 +1,53 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/*
+ * All functions on Directory that accept DOMString arguments for file or
+ * directory names only allow relative path to current directory itself. The
+ * path should be a descendent path like "path/to/file.txt" and not contain a
+ * segment of ".." or ".". So the paths aren't allowed to walk up the directory
+ * tree. For example, paths like "../foo", "..", "/foo/bar" or "foo/../bar" are
+ * not allowed.
+ *
+ * http://w3c.github.io/filesystem-api/#idl-def-Directory
+ * https://microsoftedge.github.io/directory-upload/proposal.html#directory-interface
+ */
+
+// This chromeConstructor is used by the MockFilePicker for testing only.
+[ChromeConstructor(DOMString path),
+ Exposed=(Window,Worker)]
+interface Directory {
+  /*
+   * The leaf name of the directory.
+   */
+  [Throws]
+  readonly attribute DOMString name;
+};
+
+[Exposed=(Window,Worker)]
+partial interface Directory {
+  // Already defined in the main interface declaration:
+  //readonly attribute DOMString name;
+
+  /*
+   * The path of the Directory (includes both its basename and leafname).
+   * The path begins with the name of the ancestor Directory that was
+   * originally exposed to content (say via a directory picker) and traversed
+   * to obtain this Directory.  Full filesystem paths are not exposed to
+   * unprivilaged content.
+   */
+  [Throws]
+  readonly attribute DOMString path;
+
+  /*
+   * Getter for the immediate children of this directory.
+   */
+  [Throws]
+  Promise<sequence<(File or Directory)>> getFilesAndDirectories();
+
+  [Throws]
+  Promise<sequence<File>> getFiles(optional boolean recursiveFlag = false);
+};
diff --git a/crates/web-sys/webidls/available/Document.webidl b/crates/web-sys/webidls/available/Document.webidl
new file mode 100644
index 00000000..eaf8feae
--- /dev/null
+++ b/crates/web-sys/webidls/available/Document.webidl
@@ -0,0 +1,508 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * https://dom.spec.whatwg.org/#interface-document
+ * https://html.spec.whatwg.org/multipage/dom.html#the-document-object
+ * https://html.spec.whatwg.org/multipage/obsolete.html#other-elements%2C-attributes-and-apis
+ * https://fullscreen.spec.whatwg.org/#api
+ * https://w3c.github.io/pointerlock/#extensions-to-the-document-interface
+ * https://w3c.github.io/pointerlock/#extensions-to-the-documentorshadowroot-mixin
+ * https://w3c.github.io/page-visibility/#extensions-to-the-document-interface
+ * https://drafts.csswg.org/cssom/#extensions-to-the-document-interface
+ * https://drafts.csswg.org/cssom-view/#extensions-to-the-document-interface
+ */
+
+interface WindowProxy;
+interface nsISupports;
+interface URI;
+interface nsIDocShell;
+interface nsILoadGroup;
+
+enum VisibilityState { "hidden", "visible" };
+
+/* https://dom.spec.whatwg.org/#dictdef-elementcreationoptions */
+dictionary ElementCreationOptions {
+  DOMString is;
+
+  [ChromeOnly]
+  DOMString pseudo;
+};
+
+/* https://dom.spec.whatwg.org/#interface-document */
+[Constructor]
+interface Document : Node {
+  [Throws]
+  readonly attribute DOMImplementation implementation;
+  [Pure, Throws, BinaryName="documentURIFromJS", NeedsCallerType]
+  readonly attribute DOMString URL;
+  [Pure, Throws, BinaryName="documentURIFromJS", NeedsCallerType]
+  readonly attribute DOMString documentURI;
+  [Pure]
+  readonly attribute DOMString compatMode;
+  [Pure]
+  readonly attribute DOMString characterSet;
+  [Pure,BinaryName="characterSet"]
+  readonly attribute DOMString charset; // legacy alias of .characterSet
+  [Pure,BinaryName="characterSet"]
+  readonly attribute DOMString inputEncoding; // legacy alias of .characterSet
+  [Pure]
+  readonly attribute DOMString contentType;
+
+  [Pure]
+  readonly attribute DocumentType? doctype;
+  [Pure]
+  readonly attribute Element? documentElement;
+  [Pure]
+  HTMLCollection getElementsByTagName(DOMString localName);
+  [Pure, Throws]
+  HTMLCollection getElementsByTagNameNS(DOMString? namespace, DOMString localName);
+  [Pure]
+  HTMLCollection getElementsByClassName(DOMString classNames);
+  [Pure]
+  Element? getElementById(DOMString elementId);
+
+  [CEReactions, NewObject, Throws]
+  Element createElement(DOMString localName, optional (ElementCreationOptions or DOMString) options);
+  [CEReactions, NewObject, Throws]
+  Element createElementNS(DOMString? namespace, DOMString qualifiedName, optional (ElementCreationOptions or DOMString) options);
+  [NewObject]
+  DocumentFragment createDocumentFragment();
+  [NewObject]
+  Text createTextNode(DOMString data);
+  [NewObject]
+  Comment createComment(DOMString data);
+  [NewObject, Throws]
+  ProcessingInstruction createProcessingInstruction(DOMString target, DOMString data);
+
+  [CEReactions, Throws]
+  Node importNode(Node node, optional boolean deep = false);
+  [CEReactions, Throws]
+  Node adoptNode(Node node);
+
+  [NewObject, Throws, NeedsCallerType]
+  Event createEvent(DOMString interface);
+
+  [NewObject, Throws]
+  Range createRange();
+
+  // NodeFilter.SHOW_ALL = 0xFFFFFFFF
+  [NewObject, Throws]
+  NodeIterator createNodeIterator(Node root, optional unsigned long whatToShow = 0xFFFFFFFF, optional NodeFilter? filter = null);
+  [NewObject, Throws]
+  TreeWalker createTreeWalker(Node root, optional unsigned long whatToShow = 0xFFFFFFFF, optional NodeFilter? filter = null);
+
+  // NEW
+  // No support for prepend/append yet
+  // void prepend((Node or DOMString)... nodes);
+  // void append((Node or DOMString)... nodes);
+
+  // These are not in the spec, but leave them for now for backwards compat.
+  // So sort of like Gecko extensions
+  [NewObject, Throws]
+  CDATASection createCDATASection(DOMString data);
+  [NewObject, Throws]
+  Attr createAttribute(DOMString name);
+  [NewObject, Throws]
+  Attr createAttributeNS(DOMString? namespace, DOMString name);
+};
+
+// https://html.spec.whatwg.org/multipage/dom.html#the-document-object
+partial interface Document {
+  [PutForwards=href, Unforgeable] readonly attribute Location? location;
+  //(HTML only)         attribute DOMString domain;
+  readonly attribute DOMString referrer;
+  //(HTML only)         attribute DOMString cookie;
+  readonly attribute DOMString lastModified;
+  readonly attribute DOMString readyState;
+
+  // DOM tree accessors
+  //(Not proxy yet)getter object (DOMString name);
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString title;
+  [CEReactions, Pure]
+           attribute DOMString dir;
+  [CEReactions, Pure, SetterThrows]
+           attribute HTMLElement? body;
+  [Pure]
+  readonly attribute HTMLHeadElement? head;
+  [SameObject] readonly attribute HTMLCollection images;
+  [SameObject] readonly attribute HTMLCollection embeds;
+  [SameObject] readonly attribute HTMLCollection plugins;
+  [SameObject] readonly attribute HTMLCollection links;
+  [SameObject] readonly attribute HTMLCollection forms;
+  [SameObject] readonly attribute HTMLCollection scripts;
+  [Pure]
+  NodeList getElementsByName(DOMString elementName);
+  //(Not implemented)readonly attribute DOMElementMap cssElementMap;
+
+  // dynamic markup insertion
+  //(HTML only)Document open(optional DOMString type, optional DOMString replace);
+  //(HTML only)WindowProxy open(DOMString url, DOMString name, DOMString features, optional boolean replace);
+  //(HTML only)void close();
+  //(HTML only)void write(DOMString... text);
+  //(HTML only)void writeln(DOMString... text);
+
+  // user interaction
+  [Pure]
+  readonly attribute WindowProxy? defaultView;
+  [Throws]
+  boolean hasFocus();
+  //(HTML only)         attribute DOMString designMode;
+  //(HTML only)boolean execCommand(DOMString commandId);
+  //(HTML only)boolean execCommand(DOMString commandId, boolean showUI);
+  //(HTML only)boolean execCommand(DOMString commandId, boolean showUI, DOMString value);
+  //(HTML only)boolean queryCommandEnabled(DOMString commandId);
+  //(HTML only)boolean queryCommandIndeterm(DOMString commandId);
+  //(HTML only)boolean queryCommandState(DOMString commandId);
+  //(HTML only)boolean queryCommandSupported(DOMString commandId);
+  //(HTML only)DOMString queryCommandValue(DOMString commandId);
+  //(Not implemented)readonly attribute HTMLCollection commands;
+
+  // special event handler IDL attributes that only apply to Document objects
+  [LenientThis] attribute EventHandler onreadystatechange;
+
+  // Gecko extensions?
+                attribute EventHandler onbeforescriptexecute;
+                attribute EventHandler onafterscriptexecute;
+
+                [Pref="dom.select_events.enabled"]
+                attribute EventHandler onselectionchange;
+
+  /**
+   * True if this document is synthetic : stand alone image, video, audio file,
+   * etc.
+   */
+  [Func="IsChromeOrXBL"] readonly attribute boolean mozSyntheticDocument;
+  /**
+   * Returns the script element whose script is currently being processed.
+   *
+   * @see <https://developer.mozilla.org/en/DOM/document.currentScript>
+   */
+  [Pure]
+  readonly attribute Element? currentScript;
+  /**
+   * Release the current mouse capture if it is on an element within this
+   * document.
+   *
+   * @see <https://developer.mozilla.org/en/DOM/document.releaseCapture>
+   */
+  void releaseCapture();
+  /**
+   * Use the given DOM element as the source image of target |-moz-element()|.
+   *
+   * This function introduces a new special ID (called "image element ID"),
+   * which is only used by |-moz-element()|, and associates it with the given
+   * DOM element.  Image elements ID's have the higher precedence than general
+   * HTML id's, so if |document.mozSetImageElement(<id>, <element>)| is called,
+   * |-moz-element(#<id>)| uses |<element>| as the source image even if there
+   * is another element with id attribute = |<id>|.  To unregister an image
+   * element ID |<id>|, call |document.mozSetImageElement(<id>, null)|.
+   *
+   * Example:
+   * <script>
+   *   canvas = document.createElement("canvas");
+   *   canvas.setAttribute("width", 100);
+   *   canvas.setAttribute("height", 100);
+   *   // draw to canvas
+   *   document.mozSetImageElement("canvasbg", canvas);
+   * </script>
+   * <div style="background-image: -moz-element(#canvasbg);"></div>
+   *
+   * @param aImageElementId an image element ID to associate with
+   * |aImageElement|
+   * @param aImageElement a DOM element to be used as the source image of
+   * |-moz-element(#aImageElementId)|. If this is null, the function will
+   * unregister the image element ID |aImageElementId|.
+   *
+   * @see <https://developer.mozilla.org/en/DOM/document.mozSetImageElement>
+   */
+  void mozSetImageElement(DOMString aImageElementId,
+                          Element? aImageElement);
+
+  [ChromeOnly]
+  readonly attribute URI? documentURIObject;
+
+  /**
+   * Current referrer policy - one of the REFERRER_POLICY_* constants
+   * from nsIHttpChannel.
+   */
+  [ChromeOnly]
+  readonly attribute unsigned long referrerPolicy;
+
+};
+
+// https://html.spec.whatwg.org/multipage/obsolete.html#other-elements%2C-attributes-and-apis
+partial interface Document {
+  //(HTML only)[CEReactions] attribute [TreatNullAs=EmptyString] DOMString fgColor;
+  //(HTML only)[CEReactions] attribute [TreatNullAs=EmptyString] DOMString linkColor;
+  //(HTML only)[CEReactions] attribute [TreatNullAs=EmptyString] DOMString vlinkColor;
+  //(HTML only)[CEReactions] attribute [TreatNullAs=EmptyString] DOMString alinkColor;
+  //(HTML only)[CEReactions] attribute [TreatNullAs=EmptyString] DOMString bgColor;
+
+  [SameObject] readonly attribute HTMLCollection anchors;
+  [SameObject] readonly attribute HTMLCollection applets;
+
+  //(HTML only)void clear();
+  //(HTML only)void captureEvents();
+  //(HTML only)void releaseEvents();
+
+  //(HTML only)[SameObject] readonly attribute HTMLAllCollection all;
+};
+
+// https://fullscreen.spec.whatwg.org/#api
+partial interface Document {
+  // Note: Per spec the 'S' in these two is lowercase, but the "Moz"
+  // versions have it uppercase.
+  [LenientSetter, Unscopable, Func="nsDocument::IsUnprefixedFullscreenEnabled"]
+  readonly attribute boolean fullscreen;
+  [BinaryName="fullscreen"]
+  readonly attribute boolean mozFullScreen;
+  [LenientSetter, Func="nsDocument::IsUnprefixedFullscreenEnabled", NeedsCallerType]
+  readonly attribute boolean fullscreenEnabled;
+  [BinaryName="fullscreenEnabled", NeedsCallerType]
+  readonly attribute boolean mozFullScreenEnabled;
+
+  [Func="nsDocument::IsUnprefixedFullscreenEnabled"]
+  void exitFullscreen();
+  [BinaryName="exitFullscreen"]
+  void mozCancelFullScreen();
+
+  // Events handlers
+  [Func="nsDocument::IsUnprefixedFullscreenEnabled"]
+  attribute EventHandler onfullscreenchange;
+  [Func="nsDocument::IsUnprefixedFullscreenEnabled"]
+  attribute EventHandler onfullscreenerror;
+};
+
+// https://w3c.github.io/pointerlock/#extensions-to-the-document-interface
+// https://w3c.github.io/pointerlock/#extensions-to-the-documentorshadowroot-mixin
+partial interface Document {
+  void exitPointerLock();
+
+  // Event handlers
+  attribute EventHandler onpointerlockchange;
+  attribute EventHandler onpointerlockerror;
+};
+
+// https://w3c.github.io/page-visibility/#extensions-to-the-document-interface
+partial interface Document {
+  readonly attribute boolean hidden;
+  readonly attribute VisibilityState visibilityState;
+           attribute EventHandler onvisibilitychange;
+};
+
+// https://drafts.csswg.org/cssom/#extensions-to-the-document-interface
+partial interface Document {
+    attribute DOMString? selectedStyleSheetSet;
+    readonly attribute DOMString? lastStyleSheetSet;
+    readonly attribute DOMString? preferredStyleSheetSet;
+    [Constant]
+    readonly attribute DOMStringList styleSheetSets;
+    void enableStyleSheetsForSet (DOMString? name);
+};
+
+// https://drafts.csswg.org/cssom-view/#extensions-to-the-document-interface
+partial interface Document {
+    CaretPosition? caretPositionFromPoint (float x, float y);
+
+    readonly attribute Element? scrollingElement;
+};
+
+// http://dev.w3.org/2006/webapi/selectors-api2/#interface-definitions
+partial interface Document {
+  [Throws, Pure]
+  Element?  querySelector(DOMString selectors);
+  [Throws, Pure]
+  NodeList  querySelectorAll(DOMString selectors);
+
+  //(Not implemented)Element?  find(DOMString selectors, optional (Element or sequence<Node>)? refNodes);
+  //(Not implemented)NodeList  findAll(DOMString selectors, optional (Element or sequence<Node>)? refNodes);
+};
+
+// https://drafts.csswg.org/web-animations/#extensions-to-the-document-interface
+partial interface Document {
+  [Func="nsDocument::IsWebAnimationsEnabled"]
+  readonly attribute DocumentTimeline timeline;
+  [Func="nsDocument::IsWebAnimationsEnabled"]
+  sequence<Animation> getAnimations();
+};
+
+// https://svgwg.org/svg2-draft/struct.html#InterfaceDocumentExtensions
+partial interface Document {
+  [BinaryName="SVGRootElement"]
+  readonly attribute SVGSVGElement? rootElement;
+};
+
+//  Mozilla extensions of various sorts
+partial interface Document {
+  // XBL support.  Wish we could make these [ChromeOnly], but
+  // that would likely break bindings running with the page principal.
+  [Func="IsChromeOrXBL"]
+  NodeList? getAnonymousNodes(Element elt);
+  [Func="IsChromeOrXBL"]
+  Element? getAnonymousElementByAttribute(Element elt, DOMString attrName,
+                                          DOMString attrValue);
+  [Func="IsChromeOrXBL"]
+  Element? getBindingParent(Node node);
+  [Throws, Func="IsChromeOrXBL", NeedsSubjectPrincipal]
+  void loadBindingDocument(DOMString documentURL);
+
+  // Touch bits
+  // XXXbz I can't find the sane spec for this stuff, so just cribbing
+  // from our xpidl for now.
+  [NewObject, Func="nsGenericHTMLElement::TouchEventsEnabled"]
+  Touch createTouch(optional Window? view = null,
+                    optional EventTarget? target = null,
+                    optional long identifier = 0,
+                    optional long pageX = 0,
+                    optional long pageY = 0,
+                    optional long screenX = 0,
+                    optional long screenY = 0,
+                    optional long clientX = 0,
+                    optional long clientY = 0,
+                    optional long radiusX = 0,
+                    optional long radiusY = 0,
+                    optional float rotationAngle = 0,
+                    optional float force = 0);
+  // XXXbz a hack to get around the fact that we don't support variadics as
+  // distinguishing arguments yet.  Once this hack is removed. we can also
+  // remove the corresponding overload on nsIDocument, since Touch... and
+  // sequence<Touch> look the same in the C++.
+  [NewObject, Func="nsGenericHTMLElement::TouchEventsEnabled"]
+  TouchList createTouchList(Touch touch, Touch... touches);
+  // XXXbz and another hack for the fact that we can't usefully have optional
+  // distinguishing arguments but need a working zero-arg form of
+  // createTouchList().
+  [NewObject, Func="nsGenericHTMLElement::TouchEventsEnabled"]
+  TouchList createTouchList();
+  [NewObject, Func="nsGenericHTMLElement::TouchEventsEnabled"]
+  TouchList createTouchList(sequence<Touch> touches);
+
+  [ChromeOnly]
+  attribute boolean styleSheetChangeEventsEnabled;
+
+  [ChromeOnly, Throws]
+  void obsoleteSheet(URI sheetURI);
+  [ChromeOnly, Throws]
+  void obsoleteSheet(DOMString sheetURI);
+
+  [ChromeOnly] readonly attribute nsIDocShell? docShell;
+
+  [ChromeOnly] readonly attribute DOMString contentLanguage;
+
+  [ChromeOnly] readonly attribute nsILoadGroup? documentLoadGroup;
+
+  // Blocks the initial document parser until the given promise is settled.
+  [ChromeOnly, Throws]
+  Promise<any> blockParsing(Promise<any> promise,
+                            optional BlockParsingOptions options);
+
+  // like documentURI, except that for error pages, it returns the URI we were
+  // trying to load when we hit an error, rather than the error page's own URI.
+  [ChromeOnly] readonly attribute URI? mozDocumentURIIfNotForErrorPages;
+
+  // A promise that is resolved, with this document itself, when we have both
+  // fired DOMContentLoaded and are ready to start layout.  This is used for the
+  // "document_idle" webextension script injection point.
+  [ChromeOnly, Throws]
+  readonly attribute Promise<Document> documentReadyForIdle;
+};
+
+dictionary BlockParsingOptions {
+  /**
+   * If true, blocks script-created parsers (created via document.open()) in
+   * addition to network-created parsers.
+   */
+  boolean blockScriptCreated = true;
+};
+
+// Extension to give chrome JS the ability to determine when a document was
+// created to satisfy an iframe with srcdoc attribute.
+partial interface Document {
+  [ChromeOnly] readonly attribute boolean isSrcdocDocument;
+};
+
+
+// Extension to give chrome JS the ability to get the underlying
+// sandbox flag attribute
+partial interface Document {
+  [ChromeOnly] readonly attribute DOMString? sandboxFlagsAsString;
+};
+
+
+/**
+ * Chrome document anonymous content management.
+ * This is a Chrome-only API that allows inserting fixed positioned anonymous
+ * content on top of the current page displayed in the document.
+ * The supplied content is cloned and inserted into the document's CanvasFrame.
+ * Note that this only works for HTML documents.
+ */
+partial interface Document {
+  /**
+   * Deep-clones the provided element and inserts it into the CanvasFrame.
+   * Returns an AnonymousContent instance that can be used to manipulate the
+   * inserted element.
+   */
+  [ChromeOnly, NewObject, Throws]
+  AnonymousContent insertAnonymousContent(Element aElement);
+
+  /**
+   * Removes the element inserted into the CanvasFrame given an AnonymousContent
+   * instance.
+   */
+  [ChromeOnly, Throws]
+  void removeAnonymousContent(AnonymousContent aContent);
+};
+
+// http://w3c.github.io/selection-api/#extensions-to-document-interface
+partial interface Document {
+  [Throws]
+  Selection? getSelection();
+};
+
+// Extension to give chrome JS the ability to determine whether
+// the user has interacted with the document or not.
+partial interface Document {
+  [ChromeOnly] readonly attribute boolean userHasInteracted;
+};
+
+// Extension to give chrome JS the ability to simulate activate the docuement
+// by user gesture.
+partial interface Document {
+  [ChromeOnly]
+  void notifyUserGestureActivation();
+};
+
+// Extension to give chrome and XBL JS the ability to determine whether
+// the document is sandboxed without permission to run scripts
+// and whether inline scripts are blocked by the document's CSP.
+partial interface Document {
+  [Func="IsChromeOrXBL"] readonly attribute boolean hasScriptsBlockedBySandbox;
+  [Func="IsChromeOrXBL"] readonly attribute boolean inlineScriptAllowedByCSP;
+};
+
+// For more information on Flash classification, see
+// toolkit/components/url-classifier/flash-block-lists.rst
+enum FlashClassification {
+  "unclassified",   // Denotes a classification that has not yet been computed.
+                    // Allows for lazy classification.
+  "unknown",        // Site is not on the whitelist or blacklist
+  "allowed",        // Site is on the Flash whitelist
+  "denied"          // Site is on the Flash blacklist
+};
+partial interface Document {
+  [ChromeOnly]
+  readonly attribute FlashClassification documentFlashClassification;
+};
+
+Document implements XPathEvaluator;
+Document implements GlobalEventHandlers;
+Document implements DocumentAndElementEventHandlers;
+Document implements TouchEventHandlers;
+Document implements ParentNode;
+Document implements OnErrorEventHandlerForNodes;
+Document implements GeometryUtils;
+Document implements FontFaceSource;
+Document implements DocumentOrShadowRoot;
diff --git a/crates/web-sys/webidls/available/DocumentFragment.webidl b/crates/web-sys/webidls/available/DocumentFragment.webidl
new file mode 100644
index 00000000..0f814666
--- /dev/null
+++ b/crates/web-sys/webidls/available/DocumentFragment.webidl
@@ -0,0 +1,27 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/2012/WD-dom-20120405/#interface-documentfragment
+ * http://www.w3.org/TR/2012/WD-selectors-api-20120628/#interface-definitions
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Constructor]
+interface DocumentFragment : Node {
+  Element? getElementById(DOMString elementId);
+};
+
+// http://www.w3.org/TR/2012/WD-selectors-api-20120628/#interface-definitions
+partial interface DocumentFragment {
+  [Throws]
+  Element?  querySelector(DOMString selectors);
+  [Throws]
+  NodeList  querySelectorAll(DOMString selectors);
+};
+
+DocumentFragment implements ParentNode;
diff --git a/crates/web-sys/webidls/available/DocumentOrShadowRoot.webidl b/crates/web-sys/webidls/available/DocumentOrShadowRoot.webidl
new file mode 100644
index 00000000..8a288f61
--- /dev/null
+++ b/crates/web-sys/webidls/available/DocumentOrShadowRoot.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dom.spec.whatwg.org/#documentorshadowroot
+ * http://w3c.github.io/webcomponents/spec/shadow/#extensions-to-the-documentorshadowroot-mixin
+ */
+
+[NoInterfaceObject]
+interface DocumentOrShadowRoot {
+  // Not implemented yet: bug 1430308.
+  // Selection? getSelection();
+  Element? elementFromPoint (float x, float y);
+  sequence<Element> elementsFromPoint (float x, float y);
+  // Not implemented yet: bug 1430307.
+  // CaretPosition? caretPositionFromPoint (float x, float y);
+
+  readonly attribute Element? activeElement;
+  readonly attribute StyleSheetList styleSheets;
+
+  readonly attribute Element? pointerLockElement;
+  [LenientSetter, Func="nsIDocument::IsUnprefixedFullscreenEnabled"]
+  readonly attribute Element? fullscreenElement;
+  [BinaryName="fullscreenElement"]
+  readonly attribute Element? mozFullScreenElement;
+};
diff --git a/crates/web-sys/webidls/available/DocumentTimeline.webidl b/crates/web-sys/webidls/available/DocumentTimeline.webidl
new file mode 100644
index 00000000..c618a20b
--- /dev/null
+++ b/crates/web-sys/webidls/available/DocumentTimeline.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/web-animations/#documenttimeline
+ *
+ * Copyright © 2015 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary DocumentTimelineOptions {
+  DOMHighResTimeStamp originTime = 0;
+};
+
+[Func="nsDocument::IsWebAnimationsEnabled",
+ Constructor (optional DocumentTimelineOptions options)]
+interface DocumentTimeline : AnimationTimeline {
+};
diff --git a/crates/web-sys/webidls/available/DocumentType.webidl b/crates/web-sys/webidls/available/DocumentType.webidl
new file mode 100644
index 00000000..89190266
--- /dev/null
+++ b/crates/web-sys/webidls/available/DocumentType.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dom.spec.whatwg.org/#documenttype
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface DocumentType : Node {
+  readonly attribute DOMString name;
+  readonly attribute DOMString publicId;
+  readonly attribute DOMString systemId;
+};
+
+DocumentType implements ChildNode;
diff --git a/crates/web-sys/webidls/available/DragEvent.webidl b/crates/web-sys/webidls/available/DragEvent.webidl
new file mode 100644
index 00000000..80617779
--- /dev/null
+++ b/crates/web-sys/webidls/available/DragEvent.webidl
@@ -0,0 +1,33 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Constructor(DOMString type, optional DragEventInit eventInitDict)]
+interface DragEvent : MouseEvent
+{
+  readonly attribute DataTransfer? dataTransfer;
+
+  void initDragEvent(DOMString type,
+                     optional boolean canBubble = false,
+                     optional boolean cancelable = false,
+                     optional Window? aView = null,
+                     optional long aDetail = 0,
+                     optional long aScreenX = 0,
+                     optional long aScreenY = 0,
+                     optional long aClientX = 0,
+                     optional long aClientY = 0,
+                     optional boolean aCtrlKey = false,
+                     optional boolean aAltKey = false,
+                     optional boolean aShiftKey = false,
+                     optional boolean aMetaKey = false,
+                     optional unsigned short aButton = 0,
+                     optional EventTarget? aRelatedTarget = null,
+                     optional DataTransfer? aDataTransfer = null);
+};
+
+dictionary DragEventInit : MouseEventInit
+{
+  DataTransfer? dataTransfer = null;
+};
diff --git a/crates/web-sys/webidls/available/DynamicsCompressorNode.webidl b/crates/web-sys/webidls/available/DynamicsCompressorNode.webidl
new file mode 100644
index 00000000..78170756
--- /dev/null
+++ b/crates/web-sys/webidls/available/DynamicsCompressorNode.webidl
@@ -0,0 +1,36 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary DynamicsCompressorOptions : AudioNodeOptions {
+             float attack = 0.003;
+             float knee = 30;
+             float ratio = 12;
+             float release = 0.25;
+             float threshold = -24;
+};
+
+[Pref="dom.webaudio.enabled",
+ Constructor(BaseAudioContext context, optional DynamicsCompressorOptions options)]
+interface DynamicsCompressorNode : AudioNode {
+
+    readonly attribute AudioParam threshold; // in Decibels
+    readonly attribute AudioParam knee; // in Decibels
+    readonly attribute AudioParam ratio; // unit-less
+    readonly attribute float reduction; // in Decibels
+    readonly attribute AudioParam attack; // in Seconds
+    readonly attribute AudioParam release; // in Seconds
+
+};
+
+// Mozilla extension
+DynamicsCompressorNode implements AudioNodePassThrough;
+
diff --git a/crates/web-sys/webidls/available/Element.webidl b/crates/web-sys/webidls/available/Element.webidl
new file mode 100644
index 00000000..52013769
--- /dev/null
+++ b/crates/web-sys/webidls/available/Element.webidl
@@ -0,0 +1,291 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dom.spec.whatwg.org/#element and
+ * http://domparsing.spec.whatwg.org/ and
+ * http://dev.w3.org/csswg/cssom-view/ and
+ * http://www.w3.org/TR/selectors-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface Element : Node {
+  [Constant]
+  readonly attribute DOMString? namespaceURI;
+  [Constant]
+  readonly attribute DOMString? prefix;
+  [Constant]
+  readonly attribute DOMString localName;
+
+  // Not [Constant] because it depends on which document we're in
+  [Pure]
+  readonly attribute DOMString tagName;
+
+  [CEReactions, Pure]
+           attribute DOMString id;
+  [CEReactions, Pure]
+           attribute DOMString className;
+  [Constant, PutForwards=value]
+  readonly attribute DOMTokenList classList;
+
+  [SameObject]
+  readonly attribute NamedNodeMap attributes;
+  [Pure]
+  sequence<DOMString> getAttributeNames();
+  [Pure]
+  DOMString? getAttribute(DOMString name);
+  [Pure]
+  DOMString? getAttributeNS(DOMString? namespace, DOMString localName);
+  [CEReactions, NeedsSubjectPrincipal=NonSystem, Throws]
+  boolean toggleAttribute(DOMString name, optional boolean force);
+  [CEReactions, NeedsSubjectPrincipal=NonSystem, Throws]
+  void setAttribute(DOMString name, DOMString value);
+  [CEReactions, NeedsSubjectPrincipal=NonSystem, Throws]
+  void setAttributeNS(DOMString? namespace, DOMString name, DOMString value);
+  [CEReactions, Throws]
+  void removeAttribute(DOMString name);
+  [CEReactions, Throws]
+  void removeAttributeNS(DOMString? namespace, DOMString localName);
+  [Pure]
+  boolean hasAttribute(DOMString name);
+  [Pure]
+  boolean hasAttributeNS(DOMString? namespace, DOMString localName);
+  [Pure]
+  boolean hasAttributes();
+
+  [Throws, Pure]
+  Element? closest(DOMString selector);
+
+  [Throws, Pure]
+  boolean matches(DOMString selector);
+  [Throws, Pure, BinaryName="matches"]
+  boolean webkitMatchesSelector(DOMString selector);
+
+  [Pure]
+  HTMLCollection getElementsByTagName(DOMString localName);
+  [Throws, Pure]
+  HTMLCollection getElementsByTagNameNS(DOMString? namespace, DOMString localName);
+  [Pure]
+  HTMLCollection getElementsByClassName(DOMString classNames);
+  [ChromeOnly, Pure]
+  sequence<Element> getElementsWithGrid();
+
+  [CEReactions, Throws, Pure]
+  Element? insertAdjacentElement(DOMString where, Element element); // historical
+
+  [Throws]
+  void insertAdjacentText(DOMString where, DOMString data); // historical
+
+  /**
+   * The ratio of font-size-inflated text font size to computed font
+   * size for this element. This will query the element for its primary frame,
+   * and then use this to get font size inflation information about the frame.
+   * This will be 1.0 if font size inflation is not enabled, and -1.0 if an
+   * error occurred during the retrieval of the font size inflation.
+   *
+   * @note The font size inflation ratio that is returned is actually the
+   *       font size inflation data for the element's _primary frame_, not the
+   *       element itself, but for most purposes, this should be sufficient.
+   */
+  [ChromeOnly]
+  readonly attribute float fontSizeInflation;
+
+  // Selectors API
+  /**
+   * Returns whether this element would be selected by the given selector
+   * string.
+   *
+   * See <http://dev.w3.org/2006/webapi/selectors-api2/#matchesselector>
+   */
+  [Throws, Pure, BinaryName="matches"]
+  boolean mozMatchesSelector(DOMString selector);
+
+  // Pointer events methods.
+  [Throws, Pref="dom.w3c_pointer_events.enabled"]
+  void setPointerCapture(long pointerId);
+
+  [Throws, Pref="dom.w3c_pointer_events.enabled"]
+  void releasePointerCapture(long pointerId);
+
+  [Pref="dom.w3c_pointer_events.enabled"]
+  boolean hasPointerCapture(long pointerId);
+
+  // Proprietary extensions
+  /**
+   * Set this during a mousedown event to grab and retarget all mouse events
+   * to this element until the mouse button is released or releaseCapture is
+   * called. If retargetToElement is true, then all events are targetted at
+   * this element. If false, events can also fire at descendants of this
+   * element.
+   *
+   */
+  void setCapture(optional boolean retargetToElement = false);
+
+  /**
+   * If this element has captured the mouse, release the capture. If another
+   * element has captured the mouse, this method has no effect.
+   */
+  void releaseCapture();
+
+  /*
+   * Chrome-only version of setCapture that works outside of a mousedown event.
+   */
+  [ChromeOnly]
+  void setCaptureAlways(optional boolean retargetToElement = false);
+
+  // Mozilla extensions
+
+  // Obsolete methods.
+  Attr? getAttributeNode(DOMString name);
+  [CEReactions, Throws]
+  Attr? setAttributeNode(Attr newAttr);
+  [CEReactions, Throws]
+  Attr? removeAttributeNode(Attr oldAttr);
+  Attr? getAttributeNodeNS(DOMString? namespaceURI, DOMString localName);
+  [CEReactions, Throws]
+  Attr? setAttributeNodeNS(Attr newAttr);
+
+  [ChromeOnly]
+  /**
+   * Scrolls the element by (dx, dy) CSS pixels without doing any
+   * layout flushing.
+   */
+  boolean scrollByNoFlush(long dx, long dy);
+
+  // Support reporting of Flexbox properties
+  /**
+   * If this element has a display:flex or display:inline-flex style,
+   * this property returns an object with computed values for flex
+   * properties, as well as a property that exposes the flex lines
+   * in this container.
+   */
+  [ChromeOnly, Pure]
+  Flex? getAsFlexContainer();
+
+  // Support reporting of Grid properties
+  /**
+   * If this element has a display:grid or display:inline-grid style,
+   * this property returns an object with computed values for grid
+   * tracks and lines.
+   */
+  [ChromeOnly, Pure]
+  sequence<Grid> getGridFragments();
+
+  [ChromeOnly]
+  DOMMatrixReadOnly getTransformToAncestor(Element ancestor);
+  [ChromeOnly]
+  DOMMatrixReadOnly getTransformToParent();
+  [ChromeOnly]
+  DOMMatrixReadOnly getTransformToViewport();
+};
+
+// http://dev.w3.org/csswg/cssom-view/
+enum ScrollLogicalPosition { "start", "center", "end", "nearest" };
+dictionary ScrollIntoViewOptions : ScrollOptions {
+  ScrollLogicalPosition block = "start";
+  ScrollLogicalPosition inline = "nearest";
+};
+
+// http://dev.w3.org/csswg/cssom-view/#extensions-to-the-element-interface
+partial interface Element {
+  DOMRectList getClientRects();
+  DOMRect getBoundingClientRect();
+
+  // scrolling
+  void scrollIntoView(optional (boolean or ScrollIntoViewOptions) arg);
+  // None of the CSSOM attributes are [Pure], because they flush
+           attribute long scrollTop;   // scroll on setting
+           attribute long scrollLeft;  // scroll on setting
+  readonly attribute long scrollWidth;
+  readonly attribute long scrollHeight;
+
+  void scroll(unrestricted double x, unrestricted double y);
+  void scroll(optional ScrollToOptions options);
+  void scrollTo(unrestricted double x, unrestricted double y);
+  void scrollTo(optional ScrollToOptions options);
+  void scrollBy(unrestricted double x, unrestricted double y);
+  void scrollBy(optional ScrollToOptions options);
+  // mozScrollSnap is used by chrome to perform scroll snapping after the
+  // user performs actions that may affect scroll position
+  // mozScrollSnap is deprecated, to be replaced by a web accessible API, such
+  // as an extension to the ScrollOptions dictionary.  See bug 1137937.
+  [ChromeOnly] void mozScrollSnap();
+
+  readonly attribute long clientTop;
+  readonly attribute long clientLeft;
+  readonly attribute long clientWidth;
+  readonly attribute long clientHeight;
+
+  // Mozilla specific stuff
+  /* The minimum/maximum offset that the element can be scrolled to
+     (i.e., the value that scrollLeft/scrollTop would be clamped to if they were
+     set to arbitrarily large values. */
+  [ChromeOnly] readonly attribute long scrollTopMin;
+               readonly attribute long scrollTopMax;
+  [ChromeOnly] readonly attribute long scrollLeftMin;
+               readonly attribute long scrollLeftMax;
+};
+
+// http://domparsing.spec.whatwg.org/#extensions-to-the-element-interface
+partial interface Element {
+  [CEReactions, SetterNeedsSubjectPrincipal=NonSystem, Pure, SetterThrows, GetterCanOOM, TreatNullAs=EmptyString]
+  attribute DOMString innerHTML;
+  [CEReactions, Pure,SetterThrows,TreatNullAs=EmptyString]
+  attribute DOMString outerHTML;
+  [CEReactions, Throws]
+  void insertAdjacentHTML(DOMString position, DOMString text);
+};
+
+// http://www.w3.org/TR/selectors-api/#interface-definitions
+partial interface Element {
+  [Throws, Pure]
+  Element?  querySelector(DOMString selectors);
+  [Throws, Pure]
+  NodeList  querySelectorAll(DOMString selectors);
+};
+
+// https://dom.spec.whatwg.org/#dictdef-shadowrootinit
+dictionary ShadowRootInit {
+  required ShadowRootMode mode;
+};
+
+// https://dom.spec.whatwg.org/#element
+partial interface Element {
+  // Shadow DOM v1
+  [Throws, Func="nsDocument::IsShadowDOMEnabled"]
+  ShadowRoot attachShadow(ShadowRootInit shadowRootInitDict);
+  [BinaryName="shadowRootByMode", Func="nsDocument::IsShadowDOMEnabled"]
+  readonly attribute ShadowRoot? shadowRoot;
+
+  [ChromeOnly, Func="nsDocument::IsShadowDOMEnabled", BinaryName="shadowRoot"]
+  readonly attribute ShadowRoot? openOrClosedShadowRoot;
+
+  [BinaryName="assignedSlotByMode", Func="nsDocument::IsShadowDOMEnabled"]
+  readonly attribute HTMLSlotElement? assignedSlot;
+  [CEReactions, Unscopable, SetterThrows, Func="nsDocument::IsShadowDOMEnabled"]
+           attribute DOMString slot;
+};
+
+Element implements ChildNode;
+Element implements NonDocumentTypeChildNode;
+Element implements ParentNode;
+Element implements Animatable;
+Element implements GeometryUtils;
+
+// https://fullscreen.spec.whatwg.org/#api
+partial interface Element {
+  [Throws, Func="nsDocument::IsUnprefixedFullscreenEnabled", NeedsCallerType]
+  void requestFullscreen();
+  [Throws, BinaryName="requestFullscreen", NeedsCallerType]
+  void mozRequestFullScreen();
+};
+
+// https://w3c.github.io/pointerlock/#extensions-to-the-element-interface
+partial interface Element {
+  [NeedsCallerType]
+  void requestPointerLock();
+};
diff --git a/crates/web-sys/webidls/available/ErrorEvent.webidl b/crates/web-sys/webidls/available/ErrorEvent.webidl
new file mode 100644
index 00000000..cb858dff
--- /dev/null
+++ b/crates/web-sys/webidls/available/ErrorEvent.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+[Constructor(DOMString type, optional ErrorEventInit eventInitDict),
+ Exposed=(Window,Worker,System)]
+interface ErrorEvent : Event
+{
+  readonly attribute DOMString message;
+  readonly attribute DOMString filename;
+  readonly attribute unsigned long lineno;
+  readonly attribute unsigned long colno;
+  readonly attribute any error;
+};
+
+dictionary ErrorEventInit : EventInit
+{
+  DOMString message = "";
+  DOMString filename = "";
+  unsigned long lineno = 0;
+  unsigned long colno = 0;
+  any error = null;
+};
diff --git a/crates/web-sys/webidls/available/EventHandler.webidl b/crates/web-sys/webidls/available/EventHandler.webidl
new file mode 100644
index 00000000..bbddbd50
--- /dev/null
+++ b/crates/web-sys/webidls/available/EventHandler.webidl
@@ -0,0 +1,180 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#eventhandler
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+[TreatNonObjectAsNull]
+callback EventHandlerNonNull = any (Event event);
+typedef EventHandlerNonNull? EventHandler;
+
+[TreatNonObjectAsNull]
+callback OnBeforeUnloadEventHandlerNonNull = DOMString? (Event event);
+typedef OnBeforeUnloadEventHandlerNonNull? OnBeforeUnloadEventHandler;
+
+[TreatNonObjectAsNull]
+callback OnErrorEventHandlerNonNull = any ((Event or DOMString) event, optional DOMString source, optional unsigned long lineno, optional unsigned long column, optional any error);
+typedef OnErrorEventHandlerNonNull? OnErrorEventHandler;
+
+[NoInterfaceObject]
+interface GlobalEventHandlers {
+           attribute EventHandler onabort;
+           attribute EventHandler onblur;
+// We think the spec is wrong here. See OnErrorEventHandlerForNodes/Window
+// below.
+//         attribute OnErrorEventHandler onerror;
+           attribute EventHandler onfocus;
+           //(Not implemented)attribute EventHandler oncancel;
+           attribute EventHandler onauxclick;
+           attribute EventHandler oncanplay;
+           attribute EventHandler oncanplaythrough;
+           attribute EventHandler onchange;
+           attribute EventHandler onclick;
+           attribute EventHandler onclose;
+           attribute EventHandler oncontextmenu;
+           //(Not implemented)attribute EventHandler oncuechange;
+           attribute EventHandler ondblclick;
+           attribute EventHandler ondrag;
+           attribute EventHandler ondragend;
+           attribute EventHandler ondragenter;
+           attribute EventHandler ondragexit;
+           attribute EventHandler ondragleave;
+           attribute EventHandler ondragover;
+           attribute EventHandler ondragstart;
+           attribute EventHandler ondrop;
+           attribute EventHandler ondurationchange;
+           attribute EventHandler onemptied;
+           attribute EventHandler onended;
+           attribute EventHandler oninput;
+           attribute EventHandler oninvalid;
+           attribute EventHandler onkeydown;
+           attribute EventHandler onkeypress;
+           attribute EventHandler onkeyup;
+           attribute EventHandler onload;
+           attribute EventHandler onloadeddata;
+           attribute EventHandler onloadedmetadata;
+           attribute EventHandler onloadend;
+           attribute EventHandler onloadstart;
+           attribute EventHandler onmousedown;
+  [LenientThis] attribute EventHandler onmouseenter;
+  [LenientThis] attribute EventHandler onmouseleave;
+           attribute EventHandler onmousemove;
+           attribute EventHandler onmouseout;
+           attribute EventHandler onmouseover;
+           attribute EventHandler onmouseup;
+           attribute EventHandler onwheel;
+           attribute EventHandler onpause;
+           attribute EventHandler onplay;
+           attribute EventHandler onplaying;
+           attribute EventHandler onprogress;
+           attribute EventHandler onratechange;
+           attribute EventHandler onreset;
+           attribute EventHandler onresize;
+           attribute EventHandler onscroll;
+           attribute EventHandler onseeked;
+           attribute EventHandler onseeking;
+           attribute EventHandler onselect;
+           attribute EventHandler onshow;
+           //(Not implemented)attribute EventHandler onsort;
+           attribute EventHandler onstalled;
+           attribute EventHandler onsubmit;
+           attribute EventHandler onsuspend;
+           attribute EventHandler ontimeupdate;
+           attribute EventHandler onvolumechange;
+           attribute EventHandler onwaiting;
+
+           [Pref="dom.select_events.enabled"]
+           attribute EventHandler onselectstart;
+
+           attribute EventHandler ontoggle;
+
+           // Pointer events handlers
+           [Pref="dom.w3c_pointer_events.enabled"]
+           attribute EventHandler onpointercancel;
+           [Pref="dom.w3c_pointer_events.enabled"]
+           attribute EventHandler onpointerdown;
+           [Pref="dom.w3c_pointer_events.enabled"]
+           attribute EventHandler onpointerup;
+           [Pref="dom.w3c_pointer_events.enabled"]
+           attribute EventHandler onpointermove;
+           [Pref="dom.w3c_pointer_events.enabled"]
+           attribute EventHandler onpointerout;
+           [Pref="dom.w3c_pointer_events.enabled"]
+           attribute EventHandler onpointerover;
+           [Pref="dom.w3c_pointer_events.enabled"]
+           attribute EventHandler onpointerenter;
+           [Pref="dom.w3c_pointer_events.enabled"]
+           attribute EventHandler onpointerleave;
+           [Pref="dom.w3c_pointer_events.enabled"]
+           attribute EventHandler ongotpointercapture;
+           [Pref="dom.w3c_pointer_events.enabled"]
+           attribute EventHandler onlostpointercapture;
+
+           // Mozilla-specific handlers. Unprefixed handlers live in
+           // Document rather than here.
+           attribute EventHandler onmozfullscreenchange;
+           attribute EventHandler onmozfullscreenerror;
+
+           // CSS-Animation and CSS-Transition handlers.
+           attribute EventHandler onanimationcancel;
+           attribute EventHandler onanimationend;
+           attribute EventHandler onanimationiteration;
+           attribute EventHandler onanimationstart;
+           attribute EventHandler ontransitioncancel;
+           attribute EventHandler ontransitionend;
+           attribute EventHandler ontransitionrun;
+           attribute EventHandler ontransitionstart;
+
+           // CSS-Animation and CSS-Transition legacy handlers.
+           // This handler isn't standard.
+           attribute EventHandler onwebkitanimationend;
+           attribute EventHandler onwebkitanimationiteration;
+           attribute EventHandler onwebkitanimationstart;
+           attribute EventHandler onwebkittransitionend;
+};
+
+[NoInterfaceObject]
+interface WindowEventHandlers {
+           attribute EventHandler onafterprint;
+           attribute EventHandler onbeforeprint;
+           attribute OnBeforeUnloadEventHandler onbeforeunload;
+           attribute EventHandler onhashchange;
+           attribute EventHandler onlanguagechange;
+           attribute EventHandler onmessage;
+           attribute EventHandler onmessageerror;
+           attribute EventHandler onoffline;
+           attribute EventHandler ononline;
+           attribute EventHandler onpagehide;
+           attribute EventHandler onpageshow;
+           attribute EventHandler onpopstate;
+           attribute EventHandler onstorage;
+           attribute EventHandler onunload;
+};
+
+[NoInterfaceObject]
+interface DocumentAndElementEventHandlers {
+  attribute EventHandler oncopy;
+  attribute EventHandler oncut;
+  attribute EventHandler onpaste;
+};
+
+// The spec has |attribute OnErrorEventHandler onerror;| on
+// GlobalEventHandlers, and calls the handler differently depending on
+// whether an ErrorEvent was fired. We don't do that, and until we do we'll
+// need to distinguish between onerror on Window or on nodes.
+
+[NoInterfaceObject]
+interface OnErrorEventHandlerForNodes {
+           attribute EventHandler onerror;
+};
+
+[NoInterfaceObject]
+interface OnErrorEventHandlerForWindow {
+           attribute OnErrorEventHandler onerror;
+};
diff --git a/crates/web-sys/webidls/available/EventListener.webidl b/crates/web-sys/webidls/available/EventListener.webidl
new file mode 100644
index 00000000..46aa748d
--- /dev/null
+++ b/crates/web-sys/webidls/available/EventListener.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/2012/WD-dom-20120105/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+callback interface EventListener {
+  void handleEvent(Event event);
+};
diff --git a/crates/web-sys/webidls/available/EventSource.webidl b/crates/web-sys/webidls/available/EventSource.webidl
new file mode 100644
index 00000000..f6d54c3b
--- /dev/null
+++ b/crates/web-sys/webidls/available/EventSource.webidl
@@ -0,0 +1,37 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://html.spec.whatwg.org/multipage/comms.html#the-eventsource-interface
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Exposed=(Window,DedicatedWorker,SharedWorker),
+ Constructor(USVString url, optional EventSourceInit eventSourceInitDict)]
+interface EventSource : EventTarget {
+  [Constant]
+  readonly attribute DOMString url;
+  [Constant]
+  readonly attribute boolean withCredentials;
+
+  // ready state
+  const unsigned short CONNECTING = 0;
+  const unsigned short OPEN = 1;
+  const unsigned short CLOSED = 2;
+  readonly attribute unsigned short readyState;
+
+  // networking
+  attribute EventHandler onopen;
+  attribute EventHandler onmessage;
+  attribute EventHandler onerror;
+  void close();
+};
+
+dictionary EventSourceInit {
+  boolean withCredentials = false;
+};
diff --git a/crates/web-sys/webidls/available/EventTarget.webidl b/crates/web-sys/webidls/available/EventTarget.webidl
new file mode 100644
index 00000000..6af0f69a
--- /dev/null
+++ b/crates/web-sys/webidls/available/EventTarget.webidl
@@ -0,0 +1,68 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/2012/WD-dom-20120105/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+
+dictionary EventListenerOptions {
+  boolean capture = false;
+  /* Setting to true make the listener be added to the system group. */
+  [Func="ThreadSafeIsChromeOrXBL"]
+  boolean mozSystemGroup = false;
+};
+
+dictionary AddEventListenerOptions : EventListenerOptions {
+  boolean passive;
+  boolean once = false;
+};
+
+[Constructor,
+ Exposed=(Window,Worker,WorkerDebugger,AudioWorklet,System)]
+interface EventTarget {
+  /* Passing null for wantsUntrusted means "default behavior", which
+     differs in content and chrome.  In content that default boolean
+     value is true, while in chrome the default boolean value is
+     false. */
+  [Throws]
+  void addEventListener(DOMString type,
+                        EventListener? listener,
+                        optional (AddEventListenerOptions or boolean) options,
+                        optional boolean? wantsUntrusted = null);
+  [Throws]
+  void removeEventListener(DOMString type,
+                           EventListener? listener,
+                           optional (EventListenerOptions or boolean) options);
+  [Throws, NeedsCallerType]
+  boolean dispatchEvent(Event event);
+};
+
+// Mozilla extensions for use by JS-implemented event targets to
+// implement on* properties.
+partial interface EventTarget {
+  // The use of [TreatNonCallableAsNull] here is a bit of a hack: it just makes
+  // the codegen check whether the type involved is either
+  // [TreatNonCallableAsNull] or [TreatNonObjectAsNull] and if it is handle it
+  // accordingly.  In particular, it will NOT actually treat a non-null
+  // non-callable object as null here.
+  [ChromeOnly, Throws]
+  void setEventHandler(DOMString type,
+                       [TreatNonCallableAsNull] EventHandler handler);
+
+  [ChromeOnly]
+  EventHandler getEventHandler(DOMString type);
+};
+
+// Mozilla extension to make firing events on event targets from
+// chrome easier.  This returns the window which can be used to create
+// events to fire at this EventTarget, or null if there isn't one.
+partial interface EventTarget {
+  [ChromeOnly, Exposed=(Window,System), BinaryName="ownerGlobalForBindings"]
+  readonly attribute WindowProxy? ownerGlobal;
+};
diff --git a/crates/web-sys/webidls/available/ExtendableEvent.webidl b/crates/web-sys/webidls/available/ExtendableEvent.webidl
new file mode 100644
index 00000000..01dc545e
--- /dev/null
+++ b/crates/web-sys/webidls/available/ExtendableEvent.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface, please see
+ * http://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html
+ */
+
+[Constructor(DOMString type, optional ExtendableEventInit eventInitDict),
+ Exposed=ServiceWorker]
+interface ExtendableEvent : Event {
+  // https://github.com/slightlyoff/ServiceWorker/issues/261
+  [Throws]
+  void waitUntil(Promise<any> p);
+};
+
+dictionary ExtendableEventInit : EventInit {
+  // Defined for the forward compatibility across the derived events
+};
diff --git a/crates/web-sys/webidls/available/ExtendableMessageEvent.webidl b/crates/web-sys/webidls/available/ExtendableMessageEvent.webidl
new file mode 100644
index 00000000..b2bdf679
--- /dev/null
+++ b/crates/web-sys/webidls/available/ExtendableMessageEvent.webidl
@@ -0,0 +1,44 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface, please see
+ * https://w3c.github.io/ServiceWorker/#extendablemessage-event-section
+ */
+
+[Constructor(DOMString type, optional ExtendableMessageEventInit eventInitDict),
+ Exposed=(ServiceWorker)]
+interface ExtendableMessageEvent : ExtendableEvent {
+  /**
+   * Custom data associated with this event.
+   */
+  [GetterThrows]
+  readonly attribute any data;
+
+  /**
+   * The origin of the site from which this event originated.
+   */
+  readonly attribute DOMString origin;
+
+  /**
+   * The last event ID string of the event source.
+   */
+  readonly attribute DOMString lastEventId;
+
+  /**
+   * The client, service worker or port which originated this event.
+   */
+  readonly attribute (Client or ServiceWorker or MessagePort)? source;
+
+  [Constant, Cached, Frozen]
+  readonly attribute sequence<MessagePort> ports;
+};
+
+dictionary ExtendableMessageEventInit : ExtendableEventInit {
+  any data = null;
+  DOMString origin = "";
+  DOMString lastEventId = "";
+  (Client or ServiceWorker or MessagePort)? source = null;
+  sequence<MessagePort> ports = [];
+};
diff --git a/crates/web-sys/webidls/available/External.webidl b/crates/web-sys/webidls/available/External.webidl
new file mode 100644
index 00000000..91be6163
--- /dev/null
+++ b/crates/web-sys/webidls/available/External.webidl
@@ -0,0 +1,12 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[NoInterfaceObject, JSImplementation="@mozilla.org/sidebar;1"]
+interface External
+{
+  void AddSearchProvider(DOMString aDescriptionURL);
+  unsigned long IsSearchProviderInstalled(DOMString aSearchURL);
+};
diff --git a/crates/web-sys/webidls/available/FakePluginTagInit.webidl b/crates/web-sys/webidls/available/FakePluginTagInit.webidl
new file mode 100644
index 00000000..714be875
--- /dev/null
+++ b/crates/web-sys/webidls/available/FakePluginTagInit.webidl
@@ -0,0 +1,48 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/**
+ * A fake plugin is fundamentally identified by its handlerURI.
+ *
+ * In addition to that, a fake plugin registration needs to provide at least one
+ * FakePluginMimeEntry so we'll know what types(s) the plugin is registered for.
+ * Other information is optional, though having usable niceName is highly
+ * recommended.
+ */
+dictionary FakePluginTagInit {
+  required DOMString handlerURI;
+  required sequence<FakePluginMimeEntry> mimeEntries;
+
+  // The niceName should really be provided, and be unique, if possible; it can
+  // be used as a key to persist state for this plug-in.
+  DOMString niceName = "";
+
+  // Other things can be provided but don't really matter that much.
+  DOMString fullPath = "";
+  DOMString name = "";
+  DOMString description = "";
+  DOMString fileName = "";
+  DOMString version = "";
+
+  /**
+   * Optional script to run in a sandbox when instantiating a plugin. The script
+   * runs in a sandbox with system principal in the process that contains the
+   * element that instantiates the plugin (ie the EMBED or OBJECT element). The
+   * sandbox global has a 'pluginElement' property that the script can use to
+   * access the element that instantiates the plugin.
+   */
+  DOMString sandboxScript = "";
+};
+
+/**
+ * A single MIME entry for the fake plugin.
+ */
+dictionary FakePluginMimeEntry {
+  required DOMString type;
+  DOMString description = "";
+  DOMString extension = "";
+};
+
diff --git a/crates/web-sys/webidls/available/Fetch.webidl b/crates/web-sys/webidls/available/Fetch.webidl
new file mode 100644
index 00000000..bbb1faf7
--- /dev/null
+++ b/crates/web-sys/webidls/available/Fetch.webidl
@@ -0,0 +1,38 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://fetch.spec.whatwg.org/
+ */
+
+typedef object JSON;
+typedef (Blob or BufferSource or FormData or URLSearchParams or USVString) BodyInit;
+
+[NoInterfaceObject, Exposed=(Window,Worker)]
+interface Body {
+  readonly attribute boolean bodyUsed;
+  [Throws]
+  Promise<ArrayBuffer> arrayBuffer();
+  [Throws]
+  Promise<Blob> blob();
+  [Throws]
+  Promise<FormData> formData();
+  [Throws]
+  Promise<JSON> json();
+  [Throws]
+  Promise<USVString> text();
+};
+
+// These are helper dictionaries for the parsing of a
+// getReader().read().then(data) parsing.
+// See more about how these 2 helpers are used in
+// dom/fetch/FetchStreamReader.cpp
+dictionary FetchReadableStreamReadDataDone {
+  boolean done = false;
+};
+
+dictionary FetchReadableStreamReadDataArray {
+  Uint8Array value;
+};
diff --git a/crates/web-sys/webidls/available/FetchEvent.webidl b/crates/web-sys/webidls/available/FetchEvent.webidl
new file mode 100644
index 00000000..947f00ed
--- /dev/null
+++ b/crates/web-sys/webidls/available/FetchEvent.webidl
@@ -0,0 +1,26 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface, please see
+ * http://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html
+ */
+
+[Constructor(DOMString type, FetchEventInit eventInitDict),
+ Func="ServiceWorkerVisible",
+ Exposed=(ServiceWorker)]
+interface FetchEvent : ExtendableEvent {
+  [SameObject] readonly attribute Request request;
+  readonly attribute DOMString? clientId;
+  readonly attribute boolean isReload;
+
+  [Throws]
+  void respondWith(Promise<Response> r);
+};
+
+dictionary FetchEventInit : EventInit {
+  required Request request;
+  DOMString? clientId = null;
+  boolean isReload = false;
+};
diff --git a/crates/web-sys/webidls/available/FetchObserver.webidl b/crates/web-sys/webidls/available/FetchObserver.webidl
new file mode 100644
index 00000000..8321101a
--- /dev/null
+++ b/crates/web-sys/webidls/available/FetchObserver.webidl
@@ -0,0 +1,27 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+callback interface ObserverCallback {
+  void handleEvent(FetchObserver observer);
+};
+
+enum FetchState {
+  // Pending states
+  "requesting", "responding",
+  // Final states
+  "aborted", "errored", "complete"
+};
+
+[Exposed=(Window,Worker),
+ Func="mozilla::dom::DOMPrefs::FetchObserverEnabled"]
+interface FetchObserver : EventTarget {
+  readonly attribute FetchState state;
+
+  // Events
+  attribute EventHandler onstatechange;
+  attribute EventHandler onrequestprogress;
+  attribute EventHandler onresponseprogress;
+};
diff --git a/crates/web-sys/webidls/available/File.webidl b/crates/web-sys/webidls/available/File.webidl
new file mode 100644
index 00000000..c291a5b6
--- /dev/null
+++ b/crates/web-sys/webidls/available/File.webidl
@@ -0,0 +1,55 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/FileAPI/#file
+ */
+
+interface nsIFile;
+
+[Constructor(sequence<BlobPart> fileBits,
+             USVString fileName, optional FilePropertyBag options),
+ Exposed=(Window,Worker)]
+interface File : Blob {
+  readonly attribute DOMString name;
+
+  [GetterThrows]
+  readonly attribute long long lastModified;
+};
+
+dictionary FilePropertyBag {
+  DOMString type = "";
+  long long lastModified;
+};
+
+dictionary ChromeFilePropertyBag : FilePropertyBag {
+  DOMString name = "";
+  boolean existenceCheck = true;
+};
+
+// Mozilla extensions
+partial interface File {
+  [BinaryName="relativePath", Func="mozilla::dom::DOMPrefs::WebkitBlinkDirectoryPickerEnabled"]
+  readonly attribute USVString webkitRelativePath;
+
+  [GetterThrows, ChromeOnly, NeedsCallerType]
+  readonly attribute DOMString mozFullPath;
+};
+
+// Mozilla extensions
+// These 2 methods can be used only in these conditions:
+// - the main-thread
+// - parent process OR file process OR, only for testing, with pref
+//   `dom.file.createInChild' set to true.
+[Exposed=(Window)]
+partial interface File {
+  [ChromeOnly, Throws, NeedsCallerType]
+  static Promise<File> createFromNsIFile(nsIFile file,
+                                         optional ChromeFilePropertyBag options);
+
+  [ChromeOnly, Throws, NeedsCallerType]
+  static Promise<File> createFromFileName(USVString fileName,
+                                          optional ChromeFilePropertyBag options);
+};
diff --git a/crates/web-sys/webidls/available/FileList.webidl b/crates/web-sys/webidls/available/FileList.webidl
new file mode 100644
index 00000000..5e459034
--- /dev/null
+++ b/crates/web-sys/webidls/available/FileList.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2006/webapi/FileAPI/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=(Window,Worker)]
+interface FileList {
+  getter File? item(unsigned long index);
+  readonly attribute unsigned long length;
+};
diff --git a/crates/web-sys/webidls/available/FileReader.webidl b/crates/web-sys/webidls/available/FileReader.webidl
new file mode 100644
index 00000000..1e79ba09
--- /dev/null
+++ b/crates/web-sys/webidls/available/FileReader.webidl
@@ -0,0 +1,50 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/FileAPI/#APIASynch
+ *
+ * Copyright © 2013 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Constructor,
+ Exposed=(Window,Worker,System)]
+interface FileReader : EventTarget {
+  // async read methods
+  [Throws]
+  void readAsArrayBuffer(Blob blob);
+  [Throws]
+  void readAsBinaryString(Blob filedata);
+  [Throws]
+  void readAsText(Blob blob, optional DOMString label);
+  [Throws]
+  void readAsDataURL(Blob blob);
+
+  void abort();
+
+  // states
+  const unsigned short EMPTY = 0;
+  const unsigned short LOADING = 1;
+  const unsigned short DONE = 2;
+
+
+  readonly attribute unsigned short readyState;
+
+  // File or Blob data
+  // bug 858217: readonly attribute (DOMString or ArrayBuffer)? result;
+  [Throws]
+  readonly attribute any result;
+
+  readonly attribute DOMException? error;
+
+  // event handler attributes
+  attribute EventHandler onloadstart;
+  attribute EventHandler onprogress;
+  attribute EventHandler onload;
+  attribute EventHandler onabort;
+  attribute EventHandler onerror;
+  attribute EventHandler onloadend;
+};
diff --git a/crates/web-sys/webidls/available/FileReaderSync.webidl b/crates/web-sys/webidls/available/FileReaderSync.webidl
new file mode 100644
index 00000000..6628794f
--- /dev/null
+++ b/crates/web-sys/webidls/available/FileReaderSync.webidl
@@ -0,0 +1,27 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2006/webapi/FileAPI/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Constructor,
+ Exposed=(DedicatedWorker,SharedWorker)]
+interface FileReaderSync {
+
+  // Synchronously return strings
+
+  [Throws]
+  ArrayBuffer readAsArrayBuffer(Blob blob);
+  [Throws]
+  DOMString readAsBinaryString(Blob blob);
+  [Throws]
+  DOMString readAsText(Blob blob, optional DOMString encoding);
+  [Throws]
+  DOMString readAsDataURL(Blob blob);
+};
diff --git a/crates/web-sys/webidls/available/FileSystem.webidl b/crates/web-sys/webidls/available/FileSystem.webidl
new file mode 100644
index 00000000..06b88c5c
--- /dev/null
+++ b/crates/web-sys/webidls/available/FileSystem.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+
+dictionary FileSystemFlags {
+    boolean create = false;
+    boolean exclusive = false;
+};
+
+callback interface FileSystemEntryCallback {
+    void handleEvent(FileSystemEntry entry);
+};
+
+callback interface VoidCallback {
+    void handleEvent();
+};
+
+callback interface ErrorCallback {
+    void handleEvent(DOMException err);
+};
+
+interface FileSystem {
+    readonly    attribute USVString name;
+    readonly    attribute FileSystemDirectoryEntry root;
+};
diff --git a/crates/web-sys/webidls/available/FileSystemDirectoryEntry.webidl b/crates/web-sys/webidls/available/FileSystemDirectoryEntry.webidl
new file mode 100644
index 00000000..f972d216
--- /dev/null
+++ b/crates/web-sys/webidls/available/FileSystemDirectoryEntry.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+interface FileSystemDirectoryEntry : FileSystemEntry {
+    FileSystemDirectoryReader createReader();
+
+    void getFile(optional USVString? path,
+                 optional FileSystemFlags options,
+                 optional FileSystemEntryCallback successCallback,
+                 optional ErrorCallback errorCallback);
+
+    void getDirectory(optional USVString? path,
+                      optional FileSystemFlags options,
+                      optional FileSystemEntryCallback successCallback,
+                      optional ErrorCallback errorCallback);
+};
diff --git a/crates/web-sys/webidls/available/FileSystemDirectoryReader.webidl b/crates/web-sys/webidls/available/FileSystemDirectoryReader.webidl
new file mode 100644
index 00000000..3be94830
--- /dev/null
+++ b/crates/web-sys/webidls/available/FileSystemDirectoryReader.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+callback interface FileSystemEntriesCallback {
+    void handleEvent(sequence<FileSystemEntry> entries);
+};
+
+interface FileSystemDirectoryReader {
+
+    // readEntries can be called just once. The second time it returns no data.
+
+    [Throws]
+    void readEntries(FileSystemEntriesCallback successCallback,
+                     optional ErrorCallback errorCallback);
+};
diff --git a/crates/web-sys/webidls/available/FileSystemEntry.webidl b/crates/web-sys/webidls/available/FileSystemEntry.webidl
new file mode 100644
index 00000000..af112282
--- /dev/null
+++ b/crates/web-sys/webidls/available/FileSystemEntry.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+interface FileSystemEntry {
+    readonly attribute boolean isFile;
+    readonly attribute boolean isDirectory;
+
+    [GetterThrows]
+    readonly attribute USVString name;
+
+    [GetterThrows]
+    readonly attribute USVString fullPath;
+
+    readonly attribute FileSystem filesystem;
+
+    void getParent(optional FileSystemEntryCallback successCallback,
+                   optional ErrorCallback errorCallback);
+};
diff --git a/crates/web-sys/webidls/available/FileSystemFileEntry.webidl b/crates/web-sys/webidls/available/FileSystemFileEntry.webidl
new file mode 100644
index 00000000..3f141e54
--- /dev/null
+++ b/crates/web-sys/webidls/available/FileSystemFileEntry.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+callback interface FileCallback {
+    void handleEvent(File file);
+};
+
+interface FileSystemFileEntry : FileSystemEntry {
+    [BinaryName="GetFile"]
+    void file (FileCallback successCallback,
+               optional ErrorCallback errorCallback);
+};
diff --git a/crates/web-sys/webidls/available/Flex.webidl b/crates/web-sys/webidls/available/Flex.webidl
new file mode 100644
index 00000000..58c71363
--- /dev/null
+++ b/crates/web-sys/webidls/available/Flex.webidl
@@ -0,0 +1,54 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/**
+ * These objects support visualization of flex containers by the
+ * dev tools.
+ */
+
+[ChromeOnly]
+interface Flex
+{
+  sequence<FlexLine> getLines();
+};
+
+/**
+ * Lines with items that have been shrunk are shrinking; with items
+ * that have grown are growing, and all others are unchanged.
+ */
+enum FlexLineGrowthState { "unchanged", "shrinking", "growing" };
+
+[ChromeOnly]
+interface FlexLine
+{
+  readonly attribute FlexLineGrowthState growthState;
+  readonly attribute double crossStart;
+  readonly attribute double crossSize;
+
+  // firstBaselineOffset measures from flex-start edge.
+  readonly attribute double firstBaselineOffset;
+
+  // lastBaselineOffset measures from flex-end edge.
+  readonly attribute double lastBaselineOffset;
+
+  /**
+   * getItems() returns FlexItems only for the Elements in this Flex
+   * container -- ignoring struts and abs-pos Elements.
+   */
+  sequence<FlexItem> getItems();
+};
+
+[ChromeOnly]
+interface FlexItem
+{
+  readonly attribute Node? node;
+  readonly attribute double mainBaseSize;
+  readonly attribute double mainDeltaSize;
+  readonly attribute double mainMinSize;
+  readonly attribute double mainMaxSize;
+  readonly attribute double crossMinSize;
+  readonly attribute double crossMaxSize;
+};
diff --git a/crates/web-sys/webidls/available/FocusEvent.webidl b/crates/web-sys/webidls/available/FocusEvent.webidl
new file mode 100644
index 00000000..52a2f1fd
--- /dev/null
+++ b/crates/web-sys/webidls/available/FocusEvent.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface please see
+ * http://dev.w3.org/2006/webapi/DOM-Level-3-Events/html/DOM3-Events.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Constructor(DOMString typeArg, optional FocusEventInit focusEventInitDict)]
+interface FocusEvent : UIEvent {
+  // Introduced in DOM Level 3:
+  readonly attribute EventTarget?   relatedTarget;
+};
+
+dictionary FocusEventInit : UIEventInit {
+    EventTarget? relatedTarget = null;
+};
diff --git a/crates/web-sys/webidls/available/FontFace.webidl b/crates/web-sys/webidls/available/FontFace.webidl
new file mode 100644
index 00000000..5705f5d8
--- /dev/null
+++ b/crates/web-sys/webidls/available/FontFace.webidl
@@ -0,0 +1,52 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/csswg/css-font-loading/#fontface-interface
+ *
+ * Copyright © 2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+typedef (ArrayBuffer or ArrayBufferView) BinaryData;
+
+dictionary FontFaceDescriptors {
+  DOMString style = "normal";
+  DOMString weight = "normal";
+  DOMString stretch = "normal";
+  DOMString unicodeRange = "U+0-10FFFF";
+  DOMString variant = "normal";
+  DOMString featureSettings = "normal";
+  DOMString variationSettings = "normal";
+  DOMString display = "auto";
+};
+
+enum FontFaceLoadStatus { "unloaded", "loading", "loaded", "error" };
+
+// Bug 1072107 is for exposing this in workers.
+// [Exposed=(Window,Worker)]
+[Constructor(DOMString family,
+             (DOMString or BinaryData) source,
+             optional FontFaceDescriptors descriptors),
+ Pref="layout.css.font-loading-api.enabled"]
+interface FontFace {
+  [SetterThrows] attribute DOMString family;
+  [SetterThrows] attribute DOMString style;
+  [SetterThrows] attribute DOMString weight;
+  [SetterThrows] attribute DOMString stretch;
+  [SetterThrows] attribute DOMString unicodeRange;
+  [SetterThrows] attribute DOMString variant;
+  [SetterThrows] attribute DOMString featureSettings;
+  [SetterThrows, Pref="layout.css.font-variations.enabled"] attribute DOMString variationSettings;
+  [SetterThrows, Pref="layout.css.font-display.enabled"] attribute DOMString display;
+
+  readonly attribute FontFaceLoadStatus status;
+
+  [Throws]
+  Promise<FontFace> load();
+
+  [Throws]
+  readonly attribute Promise<FontFace> loaded;
+};
diff --git a/crates/web-sys/webidls/available/FontFaceSet.webidl b/crates/web-sys/webidls/available/FontFaceSet.webidl
new file mode 100644
index 00000000..7f58fbe5
--- /dev/null
+++ b/crates/web-sys/webidls/available/FontFaceSet.webidl
@@ -0,0 +1,64 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/csswg/css-font-loading/#FontFaceSet-interface
+ *
+ * Copyright © 2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+// To implement FontFaceSet's iterator until we can use setlike.
+dictionary FontFaceSetIteratorResult
+{
+  required any value;
+  required boolean done;
+};
+
+// To implement FontFaceSet's iterator until we can use setlike.
+[NoInterfaceObject]
+interface FontFaceSetIterator {
+  [Throws] FontFaceSetIteratorResult next();
+};
+
+callback FontFaceSetForEachCallback = void (FontFace value, FontFace key, FontFaceSet set);
+
+enum FontFaceSetLoadStatus { "loading", "loaded" };
+
+// Bug 1072762 is for the FontFaceSet constructor.
+// [Constructor(sequence<FontFace> initialFaces)]
+[Pref="layout.css.font-loading-api.enabled"]
+interface FontFaceSet : EventTarget {
+
+  // Emulate setlike behavior until we can use that directly.
+  readonly attribute unsigned long size;
+  [Throws] void add(FontFace font);
+  boolean has(FontFace font);
+  boolean delete(FontFace font);
+  void clear();
+  [NewObject] FontFaceSetIterator entries();
+  // Iterator keys();
+  [NewObject, Alias=keys, Alias="@@iterator"] FontFaceSetIterator values();
+  [Throws] void forEach(FontFaceSetForEachCallback cb, optional any thisArg);
+
+  // -- events for when loading state changes
+  attribute EventHandler onloading;
+  attribute EventHandler onloadingdone;
+  attribute EventHandler onloadingerror;
+
+  // check and start loads if appropriate
+  // and fulfill promise when all loads complete
+  [NewObject] Promise<sequence<FontFace>> load(DOMString font, optional DOMString text = " ");
+
+  // return whether all fonts in the fontlist are loaded
+  // (does not initiate load if not available)
+  [Throws] boolean check(DOMString font, optional DOMString text = " ");
+
+  // async notification that font loading and layout operations are done
+  [Throws] readonly attribute Promise<void> ready;
+
+  // loading state, "loading" while one or more fonts loading, "loaded" otherwise
+  readonly attribute FontFaceSetLoadStatus status;
+};
diff --git a/crates/web-sys/webidls/available/FontFaceSetLoadEvent.webidl b/crates/web-sys/webidls/available/FontFaceSetLoadEvent.webidl
new file mode 100644
index 00000000..fee0f306
--- /dev/null
+++ b/crates/web-sys/webidls/available/FontFaceSetLoadEvent.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/csswg/css-font-loading/#FontFaceSet-interface
+ *
+ * Copyright © 2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary FontFaceSetLoadEventInit : EventInit {
+  sequence<FontFace> fontfaces = [];
+};
+
+[Constructor(DOMString type, optional FontFaceSetLoadEventInit eventInitDict),
+ Pref="layout.css.font-loading-api.enabled"]
+interface FontFaceSetLoadEvent : Event {
+  [Cached, Constant, Frozen] readonly attribute sequence<FontFace> fontfaces;
+};
diff --git a/crates/web-sys/webidls/available/FontFaceSource.webidl b/crates/web-sys/webidls/available/FontFaceSource.webidl
new file mode 100644
index 00000000..96e1c6d7
--- /dev/null
+++ b/crates/web-sys/webidls/available/FontFaceSource.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/csswg/css-font-loading/#font-face-source
+ *
+ * Copyright © 2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[NoInterfaceObject]
+interface FontFaceSource {
+
+  [Pref="layout.css.font-loading-api.enabled"]
+  readonly attribute FontFaceSet fonts;
+};
diff --git a/crates/web-sys/webidls/available/FormData.webidl b/crates/web-sys/webidls/available/FormData.webidl
new file mode 100644
index 00000000..16f780d5
--- /dev/null
+++ b/crates/web-sys/webidls/available/FormData.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://xhr.spec.whatwg.org
+ */
+
+typedef (Blob or Directory or USVString) FormDataEntryValue;
+
+[Constructor(optional HTMLFormElement form),
+ Exposed=(Window,Worker)]
+interface FormData {
+  [Throws]
+  void append(USVString name, Blob value, optional USVString filename);
+  [Throws]
+  void append(USVString name, USVString value);
+  void delete(USVString name);
+  FormDataEntryValue? get(USVString name);
+  sequence<FormDataEntryValue> getAll(USVString name);
+  boolean has(USVString name);
+  [Throws]
+  void set(USVString name, Blob value, optional USVString filename);
+  [Throws]
+  void set(USVString name, USVString value);
+  iterable<USVString, FormDataEntryValue>;
+};
diff --git a/crates/web-sys/webidls/available/FrameLoader.webidl b/crates/web-sys/webidls/available/FrameLoader.webidl
new file mode 100644
index 00000000..44584502
--- /dev/null
+++ b/crates/web-sys/webidls/available/FrameLoader.webidl
@@ -0,0 +1,219 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+interface LoadContext;
+interface TabParent;
+interface URI;
+interface nsIDocShell;
+interface nsIPrintSettings;
+interface nsIWebBrowserPersistDocumentReceiver;
+interface nsIWebProgressListener;
+
+[ChromeOnly]
+interface FrameLoader {
+  /**
+   * Get the docshell from the frame loader.
+   */
+  [GetterThrows]
+  readonly attribute nsIDocShell? docShell;
+
+  /**
+   * Get this frame loader's TabParent, if it has a remote frame.  Otherwise,
+   * returns null.
+   */
+  readonly attribute TabParent? tabParent;
+
+  /**
+   * Get an nsILoadContext for the top-level docshell. For remote
+   * frames, a shim is returned that contains private browsing and app
+   * information.
+   */
+  readonly attribute LoadContext loadContext;
+
+  /**
+   * Get the ParentSHistory for the nsFrameLoader. May return null if this
+   * frameloader is not for a toplevel frame.
+   */
+  readonly attribute ParentSHistory? parentSHistory;
+
+  /**
+   * Adds a blocking promise for the current cross process navigation.
+   * This method can only be called while the "BrowserWillChangeProcess" event
+   * is being fired.
+   */
+  [Throws]
+  void addProcessChangeBlockingPromise(Promise<any> aPromise);
+
+  /**
+   * Find out whether the loader's frame is at too great a depth in
+   * the frame tree.  This can be used to decide what operations may
+   * or may not be allowed on the loader's docshell.
+   */
+  [Pure]
+  readonly attribute boolean depthTooGreat;
+
+  /**
+   * Activate remote frame.
+   * Throws an exception with non-remote frames.
+   */
+  [Throws]
+  void activateRemoteFrame();
+
+  /**
+   * Deactivate remote frame.
+   * Throws an exception with non-remote frames.
+   */
+  [Throws]
+  void deactivateRemoteFrame();
+
+  /**
+   * @see nsIDOMWindowUtils sendMouseEvent.
+   */
+  [Throws]
+  void sendCrossProcessMouseEvent(DOMString aType,
+                                  float aX,
+                                  float aY,
+                                  long aButton,
+                                  long aClickCount,
+                                  long aModifiers,
+                                  optional boolean aIgnoreRootScrollFrame = false);
+
+  /**
+   * Activate event forwarding from client (remote frame) to parent.
+   */
+  [Throws]
+  void activateFrameEvent(DOMString aType, boolean capture);
+
+  // Note, when frameloaders are swapped, also messageManagers are swapped.
+  readonly attribute MessageSender? messageManager;
+
+  /**
+   * Request that the next time a remote layer transaction has been
+   * received by the Compositor, a MozAfterRemoteFrame event be sent
+   * to the window.
+   */
+  void requestNotifyAfterRemotePaint();
+
+  /**
+   * Close the window through the ownerElement.
+   */
+  [Throws]
+  void requestFrameLoaderClose();
+
+  /**
+   * Force a remote browser to recompute its dimension and screen position.
+   */
+  [Throws]
+  void requestUpdatePosition();
+
+  /**
+   * Print the current document.
+   *
+   * @param aOuterWindowID the ID of the outer window to print
+   * @param aPrintSettings optional print settings to use; printSilent can be
+   *                       set to prevent prompting.
+   * @param aProgressListener optional print progress listener.
+   */
+  [Throws]
+  void print(unsigned long long aOuterWindowID,
+             nsIPrintSettings aPrintSettings,
+             optional nsIWebProgressListener? aProgressListener = null);
+
+  /**
+   * If false, then the subdocument is not clipped to its CSS viewport, and the
+   * subdocument's viewport scrollbar(s) are not rendered.
+   * Defaults to true.
+   */
+  attribute boolean clipSubdocument;
+
+  /**
+   * If false, then the subdocument's scroll coordinates will not be clamped
+   * to their scroll boundaries.
+   * Defaults to true.
+   */
+  attribute boolean clampScrollPosition;
+
+  /**
+   * The element which owns this frame loader.
+   *
+   * For example, if this is a frame loader for an <iframe>, this attribute
+   * returns the iframe element.
+   */
+  [Pure]
+  readonly attribute Element? ownerElement;
+
+
+  /**
+   * Cached childID of the ContentParent owning the TabParent in this frame
+   * loader. This can be used to obtain the childID after the TabParent died.
+   */
+  [Pure]
+  readonly attribute unsigned long long childID;
+
+  /**
+   * Find out whether the owner content really is a mozbrowser. <xul:browser>
+   * is not considered to be a mozbrowser frame.
+   */
+  [Pure]
+  readonly attribute boolean ownerIsMozBrowserFrame;
+
+  /**
+   * The last known width of the frame. Reading this property will not trigger
+   * a reflow, and therefore may not reflect the current state of things. It
+   * should only be used in asynchronous APIs where values are not guaranteed
+   * to be up-to-date when received.
+   */
+  [Pure]
+  readonly attribute unsigned long lazyWidth;
+
+  /**
+   * The last known height of the frame. Reading this property will not trigger
+   * a reflow, and therefore may not reflect the current state of things. It
+   * should only be used in asynchronous APIs where values are not guaranteed
+   * to be up-to-date when received.
+   */
+  [Pure]
+  readonly attribute unsigned long lazyHeight;
+
+  /**
+   * Is `true` if the frameloader is dead (destroy has been called on it)
+   */
+  [Pure]
+  readonly attribute boolean isDead;
+};
+
+/**
+ * Interface for objects which represent a document that can be
+ * serialized with nsIWebBrowserPersist.  This interface is
+ * asynchronous because the actual document can be in another process
+ * (e.g., if this object is a FrameLoader for an out-of-process
+ * frame).
+ *
+ * XXXbz This method should really just return a Promise...
+ *
+ * @see nsIWebBrowserPersistDocumentReceiver
+ * @see nsIWebBrowserPersistDocument
+ * @see nsIWebBrowserPersist
+ *
+ * @param aOuterWindowID
+ *        The outer window ID of the subframe we'd like to persist.
+ *        If set at 0, WebBrowserPersistable will attempt to persist
+ *        the top-level document. If the outer window ID is for a subframe
+ *        that does not exist, or is not held beneath the WebBrowserPersistable,
+ *        aRecv's onError method will be called with NS_ERROR_NO_CONTENT.
+ * @param aRecv
+ *        The nsIWebBrowserPersistDocumentReceiver is a callback that
+ *        will be fired once the document is ready for persisting.
+ */
+[NoInterfaceObject]
+interface WebBrowserPersistable
+{
+  [Throws]
+  void startPersistence(unsigned long long aOuterWindowID,
+                        nsIWebBrowserPersistDocumentReceiver aRecv);
+};
+
+FrameLoader implements WebBrowserPersistable;
diff --git a/crates/web-sys/webidls/available/Function.webidl b/crates/web-sys/webidls/available/Function.webidl
new file mode 100644
index 00000000..a873a871
--- /dev/null
+++ b/crates/web-sys/webidls/available/Function.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#functiocn
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+callback Function = any(any... arguments);
+
+callback VoidFunction = void ();
diff --git a/crates/web-sys/webidls/available/FuzzingFunctions.webidl b/crates/web-sys/webidls/available/FuzzingFunctions.webidl
new file mode 100644
index 00000000..268db554
--- /dev/null
+++ b/crates/web-sys/webidls/available/FuzzingFunctions.webidl
@@ -0,0 +1,30 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/*
+ * Various functions useful for automated fuzzing that are enabled
+ * only in --enable-fuzzing builds, because they may be dangerous to
+ * enable on untrusted pages.
+*/
+
+[Pref="fuzzing.enabled"]
+interface FuzzingFunctions {
+  /**
+   * Synchronously perform a garbage collection.
+   */
+  static void garbageCollect();
+
+  /**
+   * Synchronously perform a cycle collection.
+   */
+  static void cycleCollect();
+
+  /**
+   * Enable accessibility.
+   */
+  [Throws]
+  static void enableAccessibility();
+};
diff --git a/crates/web-sys/webidls/available/GainNode.webidl b/crates/web-sys/webidls/available/GainNode.webidl
new file mode 100644
index 00000000..04bba87c
--- /dev/null
+++ b/crates/web-sys/webidls/available/GainNode.webidl
@@ -0,0 +1,27 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary GainOptions : AudioNodeOptions {
+             float gain = 1.0;
+};
+
+[Pref="dom.webaudio.enabled",
+ Constructor(BaseAudioContext context, optional GainOptions options)]
+interface GainNode : AudioNode {
+
+    readonly attribute AudioParam gain;
+
+};
+
+// Mozilla extension
+GainNode implements AudioNodePassThrough;
+
diff --git a/crates/web-sys/webidls/available/Gamepad.webidl b/crates/web-sys/webidls/available/Gamepad.webidl
new file mode 100644
index 00000000..480f9469
--- /dev/null
+++ b/crates/web-sys/webidls/available/Gamepad.webidl
@@ -0,0 +1,99 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/gamepad/
+ * https://w3c.github.io/gamepad/extensions.html
+ * https://w3c.github.io/webvr/spec/1.1/#interface-gamepad
+ */
+
+[Pref="dom.gamepad.enabled"]
+interface GamepadButton {
+  readonly    attribute boolean pressed;
+  readonly    attribute boolean touched;
+  readonly    attribute double  value;
+};
+
+enum GamepadHand {
+  "",
+  "left",
+  "right"
+};
+
+enum GamepadMappingType {
+  "",
+  "standard"
+};
+
+[Pref="dom.gamepad.enabled"]
+interface Gamepad {
+  /**
+   * An identifier, unique per type of device.
+   */
+  readonly attribute DOMString id;
+
+  /**
+   * The game port index for the device. Unique per device
+   * attached to this system.
+   */
+  readonly attribute unsigned long index;
+
+  /**
+   * The mapping in use for this device. The empty string
+   * indicates that no mapping is in use.
+   */
+  readonly attribute GamepadMappingType mapping;
+
+  /**
+   * The hand in use for this device. The empty string
+   * indicates that unknown, both hands, or not applicable
+   */
+  [Pref="dom.gamepad.extensions.enabled"]
+  readonly attribute GamepadHand hand;
+
+  /**
+   * The displayId in use for as an association point in the VRDisplay API
+   * to identify which VRDisplay that the gamepad is associated with.
+   */
+  [Pref="dom.vr.enabled"]
+  readonly attribute unsigned long displayId;
+
+  /**
+   * true if this gamepad is currently connected to the system.
+   */
+  readonly attribute boolean connected;
+
+  /**
+   * The current state of all buttons on the device, an
+   * array of GamepadButton.
+   */
+  [Pure, Cached, Frozen]
+  readonly attribute sequence<GamepadButton> buttons;
+
+  /**
+   * The current position of all axes on the device, an
+   * array of doubles.
+   */
+  [Pure, Cached, Frozen]
+  readonly attribute sequence<double> axes;
+
+  /**
+   * Timestamp from when the data of this device was last updated.
+   */
+  readonly attribute DOMHighResTimeStamp timestamp;
+
+  /**
+   * The current pose of the device, a GamepadPose.
+   */
+  [Pref="dom.gamepad.extensions.enabled"]
+  readonly attribute GamepadPose? pose;
+
+  /**
+   * The current haptic actuator of the device, an array of
+   * GamepadHapticActuator.
+   */
+  [Constant, Cached, Frozen, Pref="dom.gamepad.extensions.enabled"]
+  readonly attribute sequence<GamepadHapticActuator> hapticActuators;
+};
diff --git a/crates/web-sys/webidls/available/GamepadAxisMoveEvent.webidl b/crates/web-sys/webidls/available/GamepadAxisMoveEvent.webidl
new file mode 100644
index 00000000..7699674b
--- /dev/null
+++ b/crates/web-sys/webidls/available/GamepadAxisMoveEvent.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Pref="dom.gamepad.non_standard_events.enabled",
+ Constructor(DOMString type, optional GamepadAxisMoveEventInit eventInitDict)]
+interface GamepadAxisMoveEvent : GamepadEvent
+{
+  readonly attribute unsigned long axis;
+  readonly attribute double value;
+};
+
+dictionary GamepadAxisMoveEventInit : GamepadEventInit
+{
+  unsigned long axis = 0;
+  double value = 0;
+};
diff --git a/crates/web-sys/webidls/available/GamepadButtonEvent.webidl b/crates/web-sys/webidls/available/GamepadButtonEvent.webidl
new file mode 100644
index 00000000..b8a9e086
--- /dev/null
+++ b/crates/web-sys/webidls/available/GamepadButtonEvent.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Pref="dom.gamepad.non_standard_events.enabled",
+ Constructor(DOMString type, optional GamepadButtonEventInit eventInitDict)]
+interface GamepadButtonEvent : GamepadEvent
+{
+  readonly attribute unsigned long button;
+};
+
+dictionary GamepadButtonEventInit : GamepadEventInit
+{
+  unsigned long button = 0;
+};
diff --git a/crates/web-sys/webidls/available/GamepadEvent.webidl b/crates/web-sys/webidls/available/GamepadEvent.webidl
new file mode 100644
index 00000000..f4c3092a
--- /dev/null
+++ b/crates/web-sys/webidls/available/GamepadEvent.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Pref="dom.gamepad.enabled",
+ Constructor(DOMString type, optional GamepadEventInit eventInitDict)]
+interface GamepadEvent : Event
+{
+  readonly attribute Gamepad? gamepad;
+};
+
+dictionary GamepadEventInit : EventInit
+{
+  Gamepad? gamepad = null;
+};
diff --git a/crates/web-sys/webidls/available/GamepadHapticActuator.webidl b/crates/web-sys/webidls/available/GamepadHapticActuator.webidl
new file mode 100644
index 00000000..9255debe
--- /dev/null
+++ b/crates/web-sys/webidls/available/GamepadHapticActuator.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/gamepad/extensions.html#gamepadhapticactuator-interface
+ */
+
+enum GamepadHapticActuatorType {
+  "vibration"
+};
+
+[Pref="dom.gamepad.extensions.enabled",
+  HeaderFile="mozilla/dom/GamepadHapticActuator.h"]
+interface GamepadHapticActuator
+{
+  readonly attribute GamepadHapticActuatorType type;
+  [Throws, NewObject]
+  Promise<boolean> pulse(double value, double duration);
+};
diff --git a/crates/web-sys/webidls/available/GamepadPose.webidl b/crates/web-sys/webidls/available/GamepadPose.webidl
new file mode 100644
index 00000000..4bc20869
--- /dev/null
+++ b/crates/web-sys/webidls/available/GamepadPose.webidl
@@ -0,0 +1,30 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/gamepad/extensions.html#gamepadpose-interface
+ */
+
+[Pref="dom.gamepad.extensions.enabled"]
+interface GamepadPose
+{
+  readonly attribute boolean hasOrientation;
+  readonly attribute boolean hasPosition;
+
+  /**
+   * position, linearVelocity, and linearAcceleration are 3-component vectors.
+   * position is relative to a sitting space. Transforming this point with
+   * VRStageParameters.sittingToStandingTransform converts this to standing space.
+   */
+  [Constant, Throws] readonly attribute Float32Array? position;
+  [Constant, Throws] readonly attribute Float32Array? linearVelocity;
+  [Constant, Throws] readonly attribute Float32Array? linearAcceleration;
+
+  /* orientation is a 4-entry array representing the components of a quaternion. */
+  [Constant, Throws] readonly attribute Float32Array? orientation;
+  /* angularVelocity and angularAcceleration are the components of 3-dimensional vectors. */
+  [Constant, Throws] readonly attribute Float32Array? angularVelocity;
+  [Constant, Throws] readonly attribute Float32Array? angularAcceleration;
+};
diff --git a/crates/web-sys/webidls/available/GamepadServiceTest.webidl b/crates/web-sys/webidls/available/GamepadServiceTest.webidl
new file mode 100644
index 00000000..4831ae3c
--- /dev/null
+++ b/crates/web-sys/webidls/available/GamepadServiceTest.webidl
@@ -0,0 +1,45 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+[Pref="dom.gamepad.test.enabled"]
+interface GamepadServiceTest
+{
+  readonly attribute GamepadMappingType noMapping;
+  readonly attribute GamepadMappingType standardMapping;
+  readonly attribute GamepadHand noHand;
+  readonly attribute GamepadHand leftHand;
+  readonly attribute GamepadHand rightHand;
+
+  [Throws]
+  Promise<unsigned long> addGamepad(DOMString id,
+                                    GamepadMappingType mapping,
+                                    GamepadHand hand,
+                                    unsigned long numButtons,
+                                    unsigned long numAxes,
+                                    unsigned long numHaptics);
+
+  void removeGamepad(unsigned long index);
+
+  void newButtonEvent(unsigned long index,
+                      unsigned long button,
+                      boolean pressed,
+                      boolean touched);
+
+  void newButtonValueEvent(unsigned long index,
+                           unsigned long button,
+                           boolean pressed,
+                           boolean touched,
+                           double value);
+
+  void newAxisMoveEvent(unsigned long index,
+                        unsigned long axis,
+                        double value);
+  void newPoseMove(unsigned long index,
+                   Float32Array? orient,
+                   Float32Array? pos,
+                   Float32Array? angVelocity,
+                   Float32Array? angAcceleration,
+                   Float32Array? linVelocity,
+                   Float32Array? linAcceleration);
+};
\ No newline at end of file
diff --git a/crates/web-sys/webidls/available/Geolocation.webidl b/crates/web-sys/webidls/available/Geolocation.webidl
new file mode 100644
index 00000000..79324005
--- /dev/null
+++ b/crates/web-sys/webidls/available/Geolocation.webidl
@@ -0,0 +1,36 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/geolocation-API
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary PositionOptions {
+  boolean enableHighAccuracy = false;
+  [Clamp] unsigned long timeout = 0x7fffffff;
+  [Clamp] unsigned long maximumAge = 0;
+};
+
+[NoInterfaceObject]
+interface Geolocation {
+  [Throws, NeedsCallerType]
+  void getCurrentPosition(PositionCallback successCallback,
+                          optional PositionErrorCallback? errorCallback = null,
+                          optional PositionOptions options);
+
+  [Throws, NeedsCallerType]
+  long watchPosition(PositionCallback successCallback,
+                     optional PositionErrorCallback? errorCallback = null,
+                     optional PositionOptions options);
+
+  void clearWatch(long watchId);
+};
+
+callback PositionCallback = void (Position position);
+
+callback PositionErrorCallback = void (PositionError positionError);
diff --git a/crates/web-sys/webidls/available/GeometryUtils.webidl b/crates/web-sys/webidls/available/GeometryUtils.webidl
new file mode 100644
index 00000000..53a24a78
--- /dev/null
+++ b/crates/web-sys/webidls/available/GeometryUtils.webidl
@@ -0,0 +1,38 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/csswg/cssom-view/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum CSSBoxType { "margin", "border", "padding", "content" };
+dictionary BoxQuadOptions {
+  CSSBoxType box = "border";
+  GeometryNode relativeTo;
+};
+
+dictionary ConvertCoordinateOptions {
+  CSSBoxType fromBox = "border";
+  CSSBoxType toBox = "border";
+};
+
+[NoInterfaceObject]
+interface GeometryUtils {
+  [Throws, Func="nsINode::HasBoxQuadsSupport", NeedsCallerType]
+  sequence<DOMQuad> getBoxQuads(optional BoxQuadOptions options);
+  [Throws, Pref="layout.css.convertFromNode.enabled", NeedsCallerType]
+  DOMQuad convertQuadFromNode(DOMQuad quad, GeometryNode from, optional ConvertCoordinateOptions options);
+  [Throws, Pref="layout.css.convertFromNode.enabled", NeedsCallerType]
+  DOMQuad convertRectFromNode(DOMRectReadOnly rect, GeometryNode from, optional ConvertCoordinateOptions options);
+  [Throws, Pref="layout.css.convertFromNode.enabled", NeedsCallerType]
+  DOMPoint convertPointFromNode(DOMPointInit point, GeometryNode from, optional ConvertCoordinateOptions options);
+};
+
+// PseudoElement implements GeometryUtils;
+
+typedef (Text or Element /* or PseudoElement */ or Document) GeometryNode;
diff --git a/crates/web-sys/webidls/available/GetUserMediaRequest.webidl b/crates/web-sys/webidls/available/GetUserMediaRequest.webidl
new file mode 100644
index 00000000..7ccbcc9f
--- /dev/null
+++ b/crates/web-sys/webidls/available/GetUserMediaRequest.webidl
@@ -0,0 +1,26 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This is an internal IDL file
+ */
+
+// for gUM request start (getUserMedia:request) notification,
+// rawID and mediaSource won't be set.
+// for gUM request stop (recording-device-stopped) notification due to page reload,
+// only windowID will be set.
+// for gUM request stop (recording-device-stopped) notification due to track stop,
+// only windowID, rawID and mediaSource will be set
+
+[NoInterfaceObject]
+interface GetUserMediaRequest {
+  readonly attribute unsigned long long windowID;
+  readonly attribute unsigned long long innerWindowID;
+  readonly attribute DOMString callID;
+  readonly attribute DOMString rawID;
+  readonly attribute DOMString mediaSource;
+  MediaStreamConstraints getConstraints();
+  readonly attribute boolean isSecure;
+  readonly attribute boolean isHandlingUserInput;
+};
diff --git a/crates/web-sys/webidls/available/Grid.webidl b/crates/web-sys/webidls/available/Grid.webidl
new file mode 100644
index 00000000..0b5dbf23
--- /dev/null
+++ b/crates/web-sys/webidls/available/Grid.webidl
@@ -0,0 +1,127 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/* These objects support visualization of a css-grid by the dev tools. */
+
+/**
+ * Explicit and implicit types apply to tracks, lines, and areas.
+ * https://drafts.csswg.org/css-grid/#explicit-grids
+ * https://drafts.csswg.org/css-grid/#implicit-grids
+ */
+enum GridDeclaration { "explicit", "implicit" };
+
+/**
+ * Tracks expanded from auto-fill are repeat , auto-fits with elements are
+ * also repeat, auto-fits with no elements are removed, other tracks are static.
+ */
+enum GridTrackState { "static", "repeat", "removed" };
+
+[ChromeOnly]
+interface Grid
+{
+  readonly attribute GridDimension rows;
+  readonly attribute GridDimension cols;
+  [Cached, Constant]
+  readonly attribute sequence<GridArea> areas;
+};
+
+[ChromeOnly]
+interface GridDimension
+{
+  readonly attribute GridLines lines;
+  readonly attribute GridTracks tracks;
+};
+
+[ChromeOnly]
+interface GridLines
+{
+  readonly attribute unsigned long length;
+
+  /**
+   * This accessor method allows array-like access to lines.
+   * @param index A 0-indexed value.
+   */
+  getter GridLine? item(unsigned long index);
+};
+
+[ChromeOnly]
+interface GridLine
+{
+  /**
+   * Names include both explicit names and implicit names, which will be
+   * assigned if the line contributes to a named area.
+   * https://drafts.csswg.org/css-grid/#implicit-named-lines
+   */
+  [Cached, Constant]
+  readonly attribute sequence<DOMString> names;
+
+  readonly attribute double start;
+
+  /**
+   * Breadth is the gap between the start of this line and the start of the
+   * next track in flow direction. It primarily is set by use of the -gap
+   * properties.
+   * https://drafts.csswg.org/css-grid/#gutters
+   */
+  readonly attribute double breadth;
+
+  readonly attribute GridDeclaration type;
+
+  /**
+   * Number is the 1-indexed index of the line in flow order. The
+   * first explicit line has number 1, and numbers increment by 1 for
+   * each line after that. Lines before the first explicit line
+   * have number 0, which is not a valid addressable line number, and
+   * should be filtered out by callers.
+   */
+  readonly attribute unsigned long number;
+
+  /**
+   * NegativeNumber is the 1-indexed index of the line in reverse
+   * flow order. The last explicit line has negativeNumber -1, and
+   * negativeNumbers decrement by 1 for each line before that.
+   * Lines after the last explicit line have negativeNumber 0, which
+   * is not a valid addressable line number, and should be filtered
+   * out by callers.
+   */
+  readonly attribute long negativeNumber;
+};
+
+[ChromeOnly]
+interface GridTracks
+{
+  readonly attribute unsigned long length;
+
+  /**
+   * This accessor method allows array-like access to tracks.
+   * @param index A 0-indexed value.
+   */
+  getter GridTrack? item(unsigned long index);
+};
+
+[ChromeOnly]
+interface GridTrack
+{
+  readonly attribute double start;
+  readonly attribute double breadth;
+  readonly attribute GridDeclaration type;
+  readonly attribute GridTrackState state;
+};
+
+[ChromeOnly]
+interface GridArea
+{
+  readonly attribute DOMString name;
+  readonly attribute GridDeclaration type;
+
+  /**
+   * These values are 1-indexed line numbers bounding the area.
+   */
+  readonly attribute unsigned long rowStart;
+  readonly attribute unsigned long rowEnd;
+  readonly attribute unsigned long columnStart;
+  readonly attribute unsigned long columnEnd;
+};
diff --git a/crates/web-sys/webidls/available/GroupedHistoryEvent.webidl b/crates/web-sys/webidls/available/GroupedHistoryEvent.webidl
new file mode 100644
index 00000000..d999a1ec
--- /dev/null
+++ b/crates/web-sys/webidls/available/GroupedHistoryEvent.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[ChromeOnly,
+ Constructor(DOMString type, optional GroupedHistoryEventInit eventInitDict)]
+interface GroupedHistoryEvent : Event
+{
+  readonly attribute Element? otherBrowser;
+};
+
+dictionary GroupedHistoryEventInit : EventInit
+{
+  Element? otherBrowser = null;
+};
diff --git a/crates/web-sys/webidls/available/HTMLAllCollection.webidl b/crates/web-sys/webidls/available/HTMLAllCollection.webidl
new file mode 100644
index 00000000..b3521388
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLAllCollection.webidl
@@ -0,0 +1,14 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* Emulates undefined through Codegen.py. */
+[LegacyUnenumerableNamedProperties]
+interface HTMLAllCollection {
+  readonly attribute unsigned long length;
+  getter Node? (unsigned long index);
+  Node? item(unsigned long index);
+  (Node or HTMLCollection)? item(DOMString name);
+  legacycaller (Node or HTMLCollection)? (DOMString name);
+  getter (Node or HTMLCollection)? namedItem(DOMString name);
+};
diff --git a/crates/web-sys/webidls/available/HTMLAnchorElement.webidl b/crates/web-sys/webidls/available/HTMLAnchorElement.webidl
new file mode 100644
index 00000000..fe1c1a71
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLAnchorElement.webidl
@@ -0,0 +1,52 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-a-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-a-element
+[HTMLConstructor]
+interface HTMLAnchorElement : HTMLElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString target;
+           [CEReactions, SetterThrows]
+           attribute DOMString download;
+           [CEReactions, SetterThrows]
+           attribute DOMString ping;
+           [CEReactions, SetterThrows]
+           attribute DOMString rel;
+           [CEReactions, SetterThrows]
+           attribute DOMString referrerPolicy;
+           [PutForwards=value]
+  readonly attribute DOMTokenList relList;
+           [CEReactions, SetterThrows]
+           attribute DOMString hreflang;
+           [CEReactions, SetterThrows]
+           attribute DOMString type;
+
+           [CEReactions, Throws]
+           attribute DOMString text;
+};
+
+HTMLAnchorElement implements HTMLHyperlinkElementUtils;
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLAnchorElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString coords;
+           [CEReactions, SetterThrows]
+           attribute DOMString charset;
+           [CEReactions, SetterThrows]
+           attribute DOMString name;
+           [CEReactions, SetterThrows]
+           attribute DOMString rev;
+           [CEReactions, SetterThrows]
+           attribute DOMString shape;
+};
diff --git a/crates/web-sys/webidls/available/HTMLAreaElement.webidl b/crates/web-sys/webidls/available/HTMLAreaElement.webidl
new file mode 100644
index 00000000..997535a9
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLAreaElement.webidl
@@ -0,0 +1,44 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-area-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ &
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-area-element
+[HTMLConstructor]
+interface HTMLAreaElement : HTMLElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString alt;
+           [CEReactions, SetterThrows]
+           attribute DOMString coords;
+           [CEReactions, SetterThrows]
+           attribute DOMString shape;
+           [CEReactions, SetterThrows]
+           attribute DOMString target;
+           [CEReactions, SetterThrows]
+           attribute DOMString download;
+           [CEReactions, SetterThrows]
+           attribute DOMString ping;
+           [CEReactions, SetterThrows]
+           attribute DOMString rel;
+           [CEReactions, SetterThrows]
+           attribute DOMString referrerPolicy;
+           [PutForwards=value]
+  readonly attribute DOMTokenList relList;
+};
+
+HTMLAreaElement implements HTMLHyperlinkElementUtils;
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLAreaElement {
+           [CEReactions, SetterThrows]
+           attribute boolean noHref;
+};
diff --git a/crates/web-sys/webidls/available/HTMLAudioElement.webidl b/crates/web-sys/webidls/available/HTMLAudioElement.webidl
new file mode 100644
index 00000000..72566983
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLAudioElement.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-audio-element
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[HTMLConstructor, NamedConstructor=Audio(optional DOMString src)]
+interface HTMLAudioElement : HTMLMediaElement {};
+
diff --git a/crates/web-sys/webidls/available/HTMLBRElement.webidl b/crates/web-sys/webidls/available/HTMLBRElement.webidl
new file mode 100644
index 00000000..b0b0f80e
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLBRElement.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-br-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-br-element
+[HTMLConstructor]
+interface HTMLBRElement : HTMLElement {};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLBRElement {
+             [CEReactions, SetterThrows]
+             attribute DOMString clear;
+};
+
diff --git a/crates/web-sys/webidls/available/HTMLBaseElement.webidl b/crates/web-sys/webidls/available/HTMLBaseElement.webidl
new file mode 100644
index 00000000..ed86f8c7
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLBaseElement.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-base-element
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-base-element
+[HTMLConstructor]
+interface HTMLBaseElement : HTMLElement {
+           [CEReactions, SetterThrows, Pure]
+           attribute DOMString href;
+           [CEReactions, SetterThrows, Pure]
+           attribute DOMString target;
+};
+
diff --git a/crates/web-sys/webidls/available/HTMLBodyElement.webidl b/crates/web-sys/webidls/available/HTMLBodyElement.webidl
new file mode 100644
index 00000000..f89c287d
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLBodyElement.webidl
@@ -0,0 +1,33 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[HTMLConstructor]
+interface HTMLBodyElement : HTMLElement {
+};
+
+partial interface HTMLBodyElement {
+  [CEReactions, TreatNullAs=EmptyString, SetterThrows]
+  attribute DOMString text;
+  [CEReactions, TreatNullAs=EmptyString, SetterThrows]
+  attribute DOMString link;
+  [CEReactions, TreatNullAs=EmptyString, SetterThrows]
+  attribute DOMString vLink;
+  [CEReactions, TreatNullAs=EmptyString, SetterThrows]
+  attribute DOMString aLink;
+  [CEReactions, TreatNullAs=EmptyString, SetterThrows]
+  attribute DOMString bgColor;
+  [CEReactions, SetterThrows]
+  attribute DOMString background;
+};
+
+HTMLBodyElement implements WindowEventHandlers;
diff --git a/crates/web-sys/webidls/available/HTMLButtonElement.webidl b/crates/web-sys/webidls/available/HTMLButtonElement.webidl
new file mode 100644
index 00000000..9ea7d908
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLButtonElement.webidl
@@ -0,0 +1,48 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-button-element
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-button-element
+[HTMLConstructor]
+interface HTMLButtonElement : HTMLElement {
+  [CEReactions, SetterThrows, Pure]
+           attribute boolean autofocus;
+  [CEReactions, SetterThrows, Pure]
+           attribute boolean disabled;
+  [Pure]
+  readonly attribute HTMLFormElement? form;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString formAction;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString formEnctype;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString formMethod;
+  [CEReactions, SetterThrows, Pure]
+           attribute boolean formNoValidate;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString formTarget;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString name;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString type;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString value;
+
+  readonly attribute boolean willValidate;
+  readonly attribute ValidityState validity;
+  [Throws]
+  readonly attribute DOMString validationMessage;
+  boolean checkValidity();
+  boolean reportValidity();
+  void setCustomValidity(DOMString error);
+
+  readonly attribute NodeList labels;
+};
diff --git a/crates/web-sys/webidls/available/HTMLCanvasElement.webidl b/crates/web-sys/webidls/available/HTMLCanvasElement.webidl
new file mode 100644
index 00000000..b92a5314
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLCanvasElement.webidl
@@ -0,0 +1,71 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-canvas-element
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+interface nsISupports;
+interface Variant;
+
+[HTMLConstructor]
+interface HTMLCanvasElement : HTMLElement {
+  [CEReactions, Pure, SetterThrows]
+           attribute unsigned long width;
+  [CEReactions, Pure, SetterThrows]
+           attribute unsigned long height;
+
+  [Throws]
+  nsISupports? getContext(DOMString contextId, optional any contextOptions = null);
+
+  [Throws, NeedsSubjectPrincipal]
+  DOMString toDataURL(optional DOMString type = "",
+                      optional any encoderOptions);
+  [Throws, NeedsSubjectPrincipal]
+  void toBlob(BlobCallback _callback,
+              optional DOMString type = "",
+              optional any encoderOptions);
+};
+
+// Mozilla specific bits
+partial interface HTMLCanvasElement {
+  [Pure, SetterThrows]
+           attribute boolean mozOpaque;
+  [Throws, NeedsSubjectPrincipal]
+  File mozGetAsFile(DOMString name, optional DOMString? type = null);
+  // A Mozilla-only extension to get a canvas context backed by double-buffered
+  // shared memory. Only privileged callers can call this.
+  [ChromeOnly, Throws]
+  nsISupports? MozGetIPCContext(DOMString contextId);
+
+           attribute PrintCallback? mozPrintCallback;
+
+  [Throws, Pref="canvas.capturestream.enabled", NeedsSubjectPrincipal]
+  CanvasCaptureMediaStream captureStream(optional double frameRate);
+};
+
+// For OffscreenCanvas
+// Reference: https://wiki.whatwg.org/wiki/OffscreenCanvas
+partial interface HTMLCanvasElement {
+  [Pref="gfx.offscreencanvas.enabled", Throws]
+  OffscreenCanvas transferControlToOffscreen();
+};
+
+[ChromeOnly]
+interface MozCanvasPrintState
+{
+  // A canvas rendering context.
+  readonly attribute nsISupports context;
+
+  // To be called when rendering to the context is done.
+  void done();
+};
+
+callback PrintCallback = void(MozCanvasPrintState ctx);
+
+callback BlobCallback = void(Blob? blob);
diff --git a/crates/web-sys/webidls/available/HTMLCollection.webidl b/crates/web-sys/webidls/available/HTMLCollection.webidl
new file mode 100644
index 00000000..f7f020c0
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLCollection.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/2012/WD-dom-20120105/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[LegacyUnenumerableNamedProperties]
+interface HTMLCollection {
+  readonly attribute unsigned long length;
+  getter Element? item(unsigned long index);
+  getter Element? namedItem(DOMString name);
+};
diff --git a/crates/web-sys/webidls/available/HTMLDListElement.webidl b/crates/web-sys/webidls/available/HTMLDListElement.webidl
new file mode 100644
index 00000000..4cf1c218
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLDListElement.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-dl-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-dl-element
+[HTMLConstructor]
+interface HTMLDListElement : HTMLElement {
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLDListElement {
+           [CEReactions, SetterThrows]
+           attribute boolean compact;
+};
diff --git a/crates/web-sys/webidls/available/HTMLDataElement.webidl b/crates/web-sys/webidls/available/HTMLDataElement.webidl
new file mode 100644
index 00000000..d2453787
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLDataElement.webidl
@@ -0,0 +1,14 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/multipage/text-level-semantics.html#the-data-element
+ */
+
+[HTMLConstructor]
+interface HTMLDataElement : HTMLElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString value;
+};
diff --git a/crates/web-sys/webidls/available/HTMLDataListElement.webidl b/crates/web-sys/webidls/available/HTMLDataListElement.webidl
new file mode 100644
index 00000000..4c38fddf
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLDataListElement.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[HTMLConstructor]
+interface HTMLDataListElement : HTMLElement {
+  readonly attribute HTMLCollection options;
+};
diff --git a/crates/web-sys/webidls/available/HTMLDetailsElement.webidl b/crates/web-sys/webidls/available/HTMLDetailsElement.webidl
new file mode 100644
index 00000000..04df82e3
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLDetailsElement.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://html.spec.whatwg.org/multipage/forms.html#the-details-element
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[HTMLConstructor]
+interface HTMLDetailsElement : HTMLElement {
+  [CEReactions, SetterThrows]
+  attribute boolean open;
+};
diff --git a/crates/web-sys/webidls/available/HTMLDialogElement.webidl b/crates/web-sys/webidls/available/HTMLDialogElement.webidl
new file mode 100644
index 00000000..e9117c9c
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLDialogElement.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://html.spec.whatwg.org/multipage/forms.html#the-dialog-element
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Pref="dom.dialog_element.enabled", HTMLConstructor]
+interface HTMLDialogElement : HTMLElement {
+  [CEReactions, SetterThrows]
+  attribute boolean open;
+  attribute DOMString returnValue;
+  [CEReactions]
+  void show();
+  [CEReactions, Throws]
+  void showModal();
+  [CEReactions]
+  void close(optional DOMString returnValue);
+};
diff --git a/crates/web-sys/webidls/available/HTMLDirectoryElement.webidl b/crates/web-sys/webidls/available/HTMLDirectoryElement.webidl
new file mode 100644
index 00000000..65becbb6
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLDirectoryElement.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+[HTMLConstructor]
+interface HTMLDirectoryElement : HTMLElement {
+           [CEReactions, SetterThrows, Pure]
+           attribute boolean compact;
+};
+
diff --git a/crates/web-sys/webidls/available/HTMLDivElement.webidl b/crates/web-sys/webidls/available/HTMLDivElement.webidl
new file mode 100644
index 00000000..2b762c6f
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLDivElement.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[HTMLConstructor]
+interface HTMLDivElement : HTMLElement {};
+
+partial interface HTMLDivElement {
+  [CEReactions, SetterThrows]
+           attribute DOMString align;
+};
diff --git a/crates/web-sys/webidls/available/HTMLDocument.webidl b/crates/web-sys/webidls/available/HTMLDocument.webidl
new file mode 100644
index 00000000..dc384b51
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLDocument.webidl
@@ -0,0 +1,76 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[OverrideBuiltins]
+interface HTMLDocument : Document {
+           [SetterThrows]
+           attribute DOMString domain;
+           [Throws]
+           attribute DOMString cookie;
+  // DOM tree accessors
+  [Throws]
+  getter object (DOMString name);
+
+  // dynamic markup insertion
+  [CEReactions, Throws]
+  Document open(optional DOMString type, optional DOMString replace = ""); // type is ignored
+  [CEReactions, Throws]
+  WindowProxy? open(DOMString url, DOMString name, DOMString features, optional boolean replace = false);
+  [CEReactions, Throws]
+  void close();
+  [CEReactions, Throws]
+  void write(DOMString... text);
+  [CEReactions, Throws]
+  void writeln(DOMString... text);
+
+  [CEReactions, SetterThrows, SetterNeedsSubjectPrincipal]
+           attribute DOMString designMode;
+  [CEReactions, Throws, NeedsSubjectPrincipal]
+  boolean execCommand(DOMString commandId, optional boolean showUI = false,
+                      optional DOMString value = "");
+  [Throws, NeedsSubjectPrincipal]
+  boolean queryCommandEnabled(DOMString commandId);
+  [Throws]
+  boolean queryCommandIndeterm(DOMString commandId);
+  [Throws]
+  boolean queryCommandState(DOMString commandId);
+  [NeedsCallerType]
+  boolean queryCommandSupported(DOMString commandId);
+  [Throws]
+  DOMString queryCommandValue(DOMString commandId);
+
+  [CEReactions, TreatNullAs=EmptyString] attribute DOMString fgColor;
+  [CEReactions, TreatNullAs=EmptyString] attribute DOMString linkColor;
+  [CEReactions, TreatNullAs=EmptyString] attribute DOMString vlinkColor;
+  [CEReactions, TreatNullAs=EmptyString] attribute DOMString alinkColor;
+  [CEReactions, TreatNullAs=EmptyString] attribute DOMString bgColor;
+
+  void clear();
+
+  readonly attribute HTMLAllCollection all;
+
+  // @deprecated These are old Netscape 4 methods. Do not use,
+  //             the implementation is no-op.
+  // XXXbz do we actually need these anymore?
+  void                      captureEvents();
+  void                      releaseEvents();
+};
+
+partial interface HTMLDocument {
+  /*
+   * Number of nodes that have been blocked by
+   * the Safebrowsing API to prevent tracking.
+   */
+  [ChromeOnly, Pure]
+  readonly attribute long blockedTrackingNodeCount;
+
+  /*
+   * List of nodes that have been blocked by
+   * the Safebrowsing API to prevent tracking.
+   */
+  [ChromeOnly, Pure]
+  readonly attribute NodeList blockedTrackingNodes;
+};
diff --git a/crates/web-sys/webidls/available/HTMLElement.webidl b/crates/web-sys/webidls/available/HTMLElement.webidl
new file mode 100644
index 00000000..09742a32
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLElement.webidl
@@ -0,0 +1,100 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/ and
+ * http://dev.w3.org/csswg/cssom-view/
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[HTMLConstructor]
+interface HTMLElement : Element {
+  // metadata attributes
+  [CEReactions]
+           attribute DOMString title;
+  [CEReactions]
+           attribute DOMString lang;
+  //         attribute boolean translate;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString dir;
+  [Constant]
+  readonly attribute DOMStringMap dataset;
+
+  [CEReactions, GetterThrows, Pure, TreatNullAs=EmptyString]
+           attribute DOMString innerText;
+
+  // user interaction
+  [CEReactions, SetterThrows, Pure]
+           attribute boolean hidden;
+  [NeedsCallerType]
+  void click();
+  [CEReactions, SetterThrows, Pure]
+           attribute long tabIndex;
+  [Throws]
+  void focus();
+  [Throws]
+  void blur();
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString accessKey;
+  [Pure]
+  readonly attribute DOMString accessKeyLabel;
+  [CEReactions, SetterThrows, Pure]
+           attribute boolean draggable;
+  //[PutForwards=value] readonly attribute DOMTokenList dropzone;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString contentEditable;
+  [Pure]
+  readonly attribute boolean isContentEditable;
+  [Pure]
+  readonly attribute HTMLMenuElement? contextMenu;
+  //[SetterThrows]
+  //         attribute HTMLMenuElement? contextMenu;
+  [CEReactions, SetterThrows, Pure]
+           attribute boolean spellcheck;
+
+  // command API
+  //readonly attribute DOMString? commandType;
+  //readonly attribute DOMString? commandLabel;
+  //readonly attribute DOMString? commandIcon;
+  //readonly attribute boolean? commandHidden;
+  //readonly attribute boolean? commandDisabled;
+  //readonly attribute boolean? commandChecked;
+
+  // styling
+  [PutForwards=cssText, Constant]
+  readonly attribute CSSStyleDeclaration style;
+};
+
+// http://dev.w3.org/csswg/cssom-view/#extensions-to-the-htmlelement-interface
+partial interface HTMLElement {
+  // CSSOM things are not [Pure] because they can flush
+  readonly attribute Element? offsetParent;
+  readonly attribute long offsetTop;
+  readonly attribute long offsetLeft;
+  readonly attribute long offsetWidth;
+  readonly attribute long offsetHeight;
+};
+
+[NoInterfaceObject]
+interface TouchEventHandlers {
+  [Func="nsGenericHTMLElement::TouchEventsEnabled"]
+           attribute EventHandler ontouchstart;
+  [Func="nsGenericHTMLElement::TouchEventsEnabled"]
+           attribute EventHandler ontouchend;
+  [Func="nsGenericHTMLElement::TouchEventsEnabled"]
+           attribute EventHandler ontouchmove;
+  [Func="nsGenericHTMLElement::TouchEventsEnabled"]
+           attribute EventHandler ontouchcancel;
+};
+
+HTMLElement implements GlobalEventHandlers;
+HTMLElement implements DocumentAndElementEventHandlers;
+HTMLElement implements TouchEventHandlers;
+HTMLElement implements OnErrorEventHandlerForNodes;
+
+interface HTMLUnknownElement : HTMLElement {};
diff --git a/crates/web-sys/webidls/available/HTMLEmbedElement.webidl b/crates/web-sys/webidls/available/HTMLEmbedElement.webidl
new file mode 100644
index 00000000..bb6b5c0e
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLEmbedElement.webidl
@@ -0,0 +1,44 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-embed-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#HTMLEmbedElement-partial
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-embed-element
+[HTMLConstructor, NeedResolve]
+interface HTMLEmbedElement : HTMLElement {
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString src;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString type;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString width;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString height;
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#HTMLEmbedElement-partial
+partial interface HTMLEmbedElement {
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString align;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString name;
+};
+
+partial interface HTMLEmbedElement {
+  // GetSVGDocument
+  [NeedsSubjectPrincipal]
+  Document? getSVGDocument();
+};
+
+HTMLEmbedElement implements MozImageLoadingContent;
+HTMLEmbedElement implements MozFrameLoaderOwner;
+HTMLEmbedElement implements MozObjectLoadingContent;
diff --git a/crates/web-sys/webidls/available/HTMLFieldSetElement.webidl b/crates/web-sys/webidls/available/HTMLFieldSetElement.webidl
new file mode 100644
index 00000000..23f14e91
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLFieldSetElement.webidl
@@ -0,0 +1,35 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-fieldset-element
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[HTMLConstructor]
+interface HTMLFieldSetElement : HTMLElement {
+  [CEReactions, SetterThrows]
+           attribute boolean disabled;
+  readonly attribute HTMLFormElement? form;
+  [CEReactions, SetterThrows]
+           attribute DOMString name;
+
+  readonly attribute DOMString type;
+
+  readonly attribute HTMLCollection elements;
+
+  readonly attribute boolean willValidate;
+  readonly attribute ValidityState validity;
+  [Throws]
+  readonly attribute DOMString validationMessage;
+
+  boolean checkValidity();
+  boolean reportValidity();
+
+  void setCustomValidity(DOMString error);
+};
diff --git a/crates/web-sys/webidls/available/HTMLFontElement.webidl b/crates/web-sys/webidls/available/HTMLFontElement.webidl
new file mode 100644
index 00000000..8db6d324
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLFontElement.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[HTMLConstructor]
+interface HTMLFontElement : HTMLElement {
+  [CEReactions, TreatNullAs=EmptyString, SetterThrows] attribute DOMString color;
+  [CEReactions, SetterThrows]                          attribute DOMString face;
+  [CEReactions, SetterThrows]                          attribute DOMString size;
+};
diff --git a/crates/web-sys/webidls/available/HTMLFormControlsCollection.webidl b/crates/web-sys/webidls/available/HTMLFormControlsCollection.webidl
new file mode 100644
index 00000000..eb2d83d4
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLFormControlsCollection.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#htmlformcontrolscollection
+ *
+ * © Copyright 2004-2013 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+interface HTMLFormControlsCollection : HTMLCollection {
+  // inherits length and item()
+  /* legacycaller */ getter (RadioNodeList or Element)? namedItem(DOMString name); // shadows inherited namedItem()
+};
diff --git a/crates/web-sys/webidls/available/HTMLFormElement.webidl b/crates/web-sys/webidls/available/HTMLFormElement.webidl
new file mode 100644
index 00000000..86b6c243
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLFormElement.webidl
@@ -0,0 +1,50 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#htmlformelement
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[OverrideBuiltins, LegacyUnenumerableNamedProperties, HTMLConstructor]
+interface HTMLFormElement : HTMLElement {
+           [CEReactions, Pure, SetterThrows]
+           attribute DOMString acceptCharset;
+           [CEReactions, Pure, SetterThrows]
+           attribute DOMString action;
+           [CEReactions, Pure, SetterThrows]
+           attribute DOMString autocomplete;
+           [CEReactions, Pure, SetterThrows]
+           attribute DOMString enctype;
+           [CEReactions, Pure, SetterThrows]
+           attribute DOMString encoding;
+           [CEReactions, Pure, SetterThrows]
+           attribute DOMString method;
+           [CEReactions, Pure, SetterThrows]
+           attribute DOMString name;
+           [CEReactions, Pure, SetterThrows]
+           attribute boolean noValidate;
+           [CEReactions, Pure, SetterThrows]
+           attribute DOMString target;
+
+  [Constant]
+  readonly attribute HTMLCollection elements;
+  [Pure]
+  readonly attribute long length;
+
+  getter Element (unsigned long index);
+  // TODO this should be: getter (RadioNodeList or HTMLInputElement or HTMLImageElement) (DOMString name);
+  getter nsISupports (DOMString name);
+
+  [Throws]
+  void submit();
+  [CEReactions]
+  void reset();
+  boolean checkValidity();
+  boolean reportValidity();
+};
diff --git a/crates/web-sys/webidls/available/HTMLFrameElement.webidl b/crates/web-sys/webidls/available/HTMLFrameElement.webidl
new file mode 100644
index 00000000..2d712caf
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLFrameElement.webidl
@@ -0,0 +1,38 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#htmlframeelement
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#htmlframeelement
+[HTMLConstructor]
+interface HTMLFrameElement : HTMLElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString name;
+           [CEReactions, SetterThrows]
+           attribute DOMString scrolling;
+           [CEReactions, SetterNeedsSubjectPrincipal=NonSystem, SetterThrows]
+           attribute DOMString src;
+           [CEReactions, SetterThrows]
+           attribute DOMString frameBorder;
+           [CEReactions, SetterThrows]
+           attribute DOMString longDesc;
+           [CEReactions, SetterThrows]
+           attribute boolean noResize;
+  [NeedsSubjectPrincipal]
+  readonly attribute Document? contentDocument;
+  readonly attribute WindowProxy? contentWindow;
+
+  [CEReactions, TreatNullAs=EmptyString, SetterThrows]
+  attribute DOMString marginHeight;
+  [CEReactions, TreatNullAs=EmptyString, SetterThrows]
+  attribute DOMString marginWidth;
+};
+
+HTMLFrameElement implements MozFrameLoaderOwner;
diff --git a/crates/web-sys/webidls/available/HTMLFrameSetElement.webidl b/crates/web-sys/webidls/available/HTMLFrameSetElement.webidl
new file mode 100644
index 00000000..afc4465d
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLFrameSetElement.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[HTMLConstructor]
+interface HTMLFrameSetElement : HTMLElement {
+  [CEReactions, SetterThrows]
+  attribute DOMString cols;
+  [CEReactions, SetterThrows]
+  attribute DOMString rows;
+};
+
+HTMLFrameSetElement implements WindowEventHandlers;
diff --git a/crates/web-sys/webidls/available/HTMLHRElement.webidl b/crates/web-sys/webidls/available/HTMLHRElement.webidl
new file mode 100644
index 00000000..24ba3112
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLHRElement.webidl
@@ -0,0 +1,31 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-hr-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-hr-element
+[HTMLConstructor]
+interface HTMLHRElement : HTMLElement {
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLHRElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString align;
+           [CEReactions, SetterThrows]
+           attribute DOMString color;
+           [CEReactions, SetterThrows]
+           attribute boolean noShade;
+           [CEReactions, SetterThrows]
+           attribute DOMString size;
+           [CEReactions, SetterThrows]
+           attribute DOMString width;
+};
diff --git a/crates/web-sys/webidls/available/HTMLHeadElement.webidl b/crates/web-sys/webidls/available/HTMLHeadElement.webidl
new file mode 100644
index 00000000..b649712a
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLHeadElement.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-head-element
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-head-element
+[HTMLConstructor]
+interface HTMLHeadElement : HTMLElement {};
+
diff --git a/crates/web-sys/webidls/available/HTMLHeadingElement.webidl b/crates/web-sys/webidls/available/HTMLHeadingElement.webidl
new file mode 100644
index 00000000..a39e24cf
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLHeadingElement.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-h1,-h2,-h3,-h4,-h5,-and-h6-elements
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-h1,-h2,-h3,-h4,-h5,-and-h6-elements
+[HTMLConstructor]
+interface HTMLHeadingElement : HTMLElement {
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLHeadingElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString align;
+};
diff --git a/crates/web-sys/webidls/available/HTMLHtmlElement.webidl b/crates/web-sys/webidls/available/HTMLHtmlElement.webidl
new file mode 100644
index 00000000..5b2a9a92
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLHtmlElement.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-html-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-html-element
+[HTMLConstructor]
+interface HTMLHtmlElement : HTMLElement {};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLHtmlElement {
+           [CEReactions, SetterThrows, Pure]
+           attribute DOMString version;
+};
diff --git a/crates/web-sys/webidls/available/HTMLHyperlinkElementUtils.webidl b/crates/web-sys/webidls/available/HTMLHyperlinkElementUtils.webidl
new file mode 100644
index 00000000..ae53fd75
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLHyperlinkElementUtils.webidl
@@ -0,0 +1,43 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://html.spec.whatwg.org/multipage/semantics.html#htmlhyperlinkelementutils
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[NoInterfaceObject]
+interface HTMLHyperlinkElementUtils {
+  // Bug 824857: no support for stringifier attributes yet.
+  //  stringifier attribute USVString href;
+
+  // Bug 824857 should remove this.
+  stringifier;
+
+  [CEReactions, SetterThrows]
+           attribute USVString href;
+
+  readonly attribute USVString origin;
+  [CEReactions]
+           attribute USVString protocol;
+  [CEReactions]
+           attribute USVString username;
+  [CEReactions]
+           attribute USVString password;
+  [CEReactions]
+           attribute USVString host;
+  [CEReactions]
+           attribute USVString hostname;
+  [CEReactions]
+           attribute USVString port;
+  [CEReactions]
+           attribute USVString pathname;
+  [CEReactions]
+           attribute USVString search;
+  [CEReactions]
+           attribute USVString hash;
+};
diff --git a/crates/web-sys/webidls/available/HTMLIFrameElement.webidl b/crates/web-sys/webidls/available/HTMLIFrameElement.webidl
new file mode 100644
index 00000000..5801de76
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLIFrameElement.webidl
@@ -0,0 +1,69 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-iframe-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[HTMLConstructor]
+interface HTMLIFrameElement : HTMLElement {
+  [CEReactions, SetterNeedsSubjectPrincipal=NonSystem, SetterThrows, Pure]
+           attribute DOMString src;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString srcdoc;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString name;
+  [PutForwards=value] readonly attribute DOMTokenList sandbox;
+           // attribute boolean seamless;
+  [CEReactions, SetterThrows, Pure]
+           attribute boolean allowFullscreen;
+  [CEReactions, SetterThrows, Pure]
+           attribute boolean allowPaymentRequest;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString width;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString height;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString referrerPolicy;
+  [NeedsSubjectPrincipal]
+  readonly attribute Document? contentDocument;
+  readonly attribute WindowProxy? contentWindow;
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLIFrameElement {
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString align;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString scrolling;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString frameBorder;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString longDesc;
+
+  [CEReactions, TreatNullAs=EmptyString, SetterThrows, Pure]
+           attribute DOMString marginHeight;
+  [CEReactions, TreatNullAs=EmptyString, SetterThrows, Pure]
+           attribute DOMString marginWidth;
+};
+
+partial interface HTMLIFrameElement {
+  // GetSVGDocument
+  [NeedsSubjectPrincipal]
+  Document? getSVGDocument();
+};
+
+partial interface HTMLIFrameElement {
+  // nsIDOMMozBrowserFrame
+  [ChromeOnly,SetterThrows]
+           attribute boolean mozbrowser;
+};
+
+HTMLIFrameElement implements MozFrameLoaderOwner;
+HTMLIFrameElement implements BrowserElement;
diff --git a/crates/web-sys/webidls/available/HTMLImageElement.webidl b/crates/web-sys/webidls/available/HTMLImageElement.webidl
new file mode 100644
index 00000000..42664c65
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLImageElement.webidl
@@ -0,0 +1,129 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#htmlimageelement
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+interface imgINotificationObserver;
+interface imgIRequest;
+interface URI;
+interface nsIStreamListener;
+
+[HTMLConstructor,
+ NamedConstructor=Image(optional unsigned long width, optional unsigned long height)]
+interface HTMLImageElement : HTMLElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString alt;
+           [CEReactions, SetterNeedsSubjectPrincipal=NonSystem, SetterThrows]
+           attribute DOMString src;
+           [CEReactions, SetterNeedsSubjectPrincipal=NonSystem, SetterThrows]
+           attribute DOMString srcset;
+           [CEReactions, SetterThrows]
+           attribute DOMString? crossOrigin;
+           [CEReactions, SetterThrows]
+           attribute DOMString useMap;
+           [CEReactions, SetterThrows]
+           attribute DOMString referrerPolicy;
+           [CEReactions, SetterThrows]
+           attribute boolean isMap;
+           [CEReactions, SetterThrows]
+           attribute unsigned long width;
+           [CEReactions, SetterThrows]
+           attribute unsigned long height;
+  readonly attribute unsigned long naturalWidth;
+  readonly attribute unsigned long naturalHeight;
+  readonly attribute boolean complete;
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLImageElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString name;
+           [CEReactions, SetterThrows]
+           attribute DOMString align;
+           [CEReactions, SetterThrows]
+           attribute unsigned long hspace;
+           [CEReactions, SetterThrows]
+           attribute unsigned long vspace;
+           [CEReactions, SetterThrows]
+           attribute DOMString longDesc;
+
+  [CEReactions, TreatNullAs=EmptyString,SetterThrows] attribute DOMString border;
+};
+
+// [Update me: not in whatwg spec yet]
+// http://picture.responsiveimages.org/#the-img-element
+partial interface HTMLImageElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString sizes;
+  readonly attribute DOMString currentSrc;
+};
+
+// Mozilla extensions.
+partial interface HTMLImageElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString lowsrc;
+
+  // These attributes are offsets from the closest view (to mimic
+  // NS4's "offset-from-layer" behavior).
+  readonly attribute long x;
+  readonly attribute long y;
+};
+
+[NoInterfaceObject]
+interface MozImageLoadingContent {
+  // Mirrored chrome-only nsIImageLoadingContent methods.  Please make sure
+  // to update this list if nsIImageLoadingContent changes.
+  [ChromeOnly]
+  const long UNKNOWN_REQUEST = -1;
+  [ChromeOnly]
+  const long CURRENT_REQUEST = 0;
+  [ChromeOnly]
+  const long PENDING_REQUEST = 1;
+
+  [ChromeOnly]
+  attribute boolean loadingEnabled;
+  [ChromeOnly]
+  readonly attribute short imageBlockingStatus;
+  /**
+   * Same as addNativeObserver but intended for scripted observers or observers
+   * from another or without a document.
+   */
+  [ChromeOnly]
+  void addObserver(imgINotificationObserver aObserver);
+  /**
+   * Same as removeNativeObserver but intended for scripted observers or
+   * observers from another or without a document.
+   */
+  [ChromeOnly]
+  void removeObserver(imgINotificationObserver aObserver);
+  [ChromeOnly,Throws]
+  imgIRequest? getRequest(long aRequestType);
+  [ChromeOnly,Throws]
+  long getRequestType(imgIRequest aRequest);
+  [ChromeOnly,Throws]
+  readonly attribute URI? currentURI;
+  // Gets the final URI of the current request, if available.
+  // Otherwise, returns null.
+  [ChromeOnly]
+  readonly attribute URI? currentRequestFinalURI;
+  /**
+   * forceReload forces reloading of the image pointed to by currentURI
+   *
+   * @param aNotify request should notify
+   * @throws NS_ERROR_NOT_AVAILABLE if there is no current URI to reload
+   */
+  [ChromeOnly,Throws]
+  void forceReload(optional boolean aNotify = true);
+  [ChromeOnly]
+  void forceImageState(boolean aForce, unsigned long long aState);
+};
+
+HTMLImageElement implements MozImageLoadingContent;
diff --git a/crates/web-sys/webidls/available/HTMLInputElement.webidl b/crates/web-sys/webidls/available/HTMLInputElement.webidl
new file mode 100644
index 00000000..c5f4ab8a
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLInputElement.webidl
@@ -0,0 +1,285 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-input-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+enum SelectionMode {
+  "select",
+  "start",
+  "end",
+  "preserve",
+};
+
+interface XULControllers;
+
+[HTMLConstructor]
+interface HTMLInputElement : HTMLElement {
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString accept;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString alt;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString autocomplete;
+  [CEReactions, Pure, SetterThrows]
+           attribute boolean autofocus;
+  [CEReactions, Pure, SetterThrows]
+           attribute boolean defaultChecked;
+  [Pure]
+           attribute boolean checked;
+           // Bug 850337 - attribute DOMString dirName;
+  [CEReactions, Pure, SetterThrows]
+           attribute boolean disabled;
+  readonly attribute HTMLFormElement? form;
+  [Pure]
+           attribute FileList? files;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString formAction;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString formEnctype;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString formMethod;
+  [CEReactions, Pure, SetterThrows]
+           attribute boolean formNoValidate;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString formTarget;
+  [CEReactions, Pure, SetterThrows]
+           attribute unsigned long height;
+  [Pure]
+           attribute boolean indeterminate;
+  [CEReactions, Pure, SetterThrows, Pref="dom.forms.inputmode"]
+           attribute DOMString inputMode;
+  [Pure]
+  readonly attribute HTMLElement? list;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString max;
+  [CEReactions, Pure, SetterThrows]
+           attribute long maxLength;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString min;
+  [CEReactions, Pure, SetterThrows]
+           attribute long minLength;
+  [CEReactions, Pure, SetterThrows]
+           attribute boolean multiple;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString name;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString pattern;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString placeholder;
+  [CEReactions, Pure, SetterThrows]
+           attribute boolean readOnly;
+  [CEReactions, Pure, SetterThrows]
+           attribute boolean required;
+  [CEReactions, Pure, SetterThrows]
+           attribute unsigned long size;
+  [CEReactions, Pure, SetterNeedsSubjectPrincipal=NonSystem, SetterThrows]
+           attribute DOMString src;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString step;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString type;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString defaultValue;
+  [CEReactions, Pure, TreatNullAs=EmptyString, SetterThrows, NeedsCallerType]
+           attribute DOMString value;
+  [Throws, Func="HTMLInputElement::ValueAsDateEnabled"]
+           attribute Date? valueAsDate;
+  [Pure, SetterThrows]
+           attribute unrestricted double valueAsNumber;
+  [CEReactions, SetterThrows]
+           attribute unsigned long width;
+
+  [Throws]
+  void stepUp(optional long n = 1);
+  [Throws]
+  void stepDown(optional long n = 1);
+
+  [Pure]
+  readonly attribute boolean willValidate;
+  [Pure]
+  readonly attribute ValidityState validity;
+  [Throws]
+  readonly attribute DOMString validationMessage;
+  boolean checkValidity();
+  boolean reportValidity();
+  void setCustomValidity(DOMString error);
+
+  readonly attribute NodeList? labels;
+
+  void select();
+
+  [Throws]
+           attribute unsigned long? selectionStart;
+  [Throws]
+           attribute unsigned long? selectionEnd;
+  [Throws]
+           attribute DOMString? selectionDirection;
+  [Throws]
+  void setRangeText(DOMString replacement);
+  [Throws]
+  void setRangeText(DOMString replacement, unsigned long start,
+    unsigned long end, optional SelectionMode selectionMode = "preserve");
+  [Throws]
+  void setSelectionRange(unsigned long start, unsigned long end, optional DOMString direction);
+
+  // also has obsolete members
+};
+
+partial interface HTMLInputElement {
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString align;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString useMap;
+};
+
+// Mozilla extensions
+
+partial interface HTMLInputElement {
+  [GetterThrows, ChromeOnly]
+  readonly attribute XULControllers        controllers;
+  // Binaryname because we have a FragmentOrElement function named "TextLength()".
+  [NeedsCallerType, BinaryName="inputTextLength"]
+  readonly attribute long                  textLength;
+
+  [Throws, ChromeOnly]
+  sequence<DOMString> mozGetFileNameArray();
+
+  [ChromeOnly, Throws]
+  void mozSetFileNameArray(sequence<DOMString> fileNames);
+
+  [ChromeOnly]
+  void mozSetFileArray(sequence<File> files);
+
+  // This method is meant to use for testing only.
+  [ChromeOnly, Throws]
+  void mozSetDirectory(DOMString directoryPath);
+
+  // This method is meant to use for testing only.
+  [ChromeOnly]
+  void mozSetDndFilesAndDirectories(sequence<(File or Directory)> list);
+
+  // Number controls (<input type=number>) have an anonymous text control
+  // (<input type=text>) in the anonymous shadow tree that they contain. On
+  // such an anonymous text control this property provides access to the
+  // number control that owns the text control. This is useful, for example,
+  // in code that looks at the currently focused element to make decisions
+  // about which IME to bring up. Such code needs to be able to check for any
+  // owning number control since it probably wants to bring up a number pad
+  // instead of the standard keyboard, even when the anonymous text control has
+  // focus.
+  [ChromeOnly]
+  readonly attribute HTMLInputElement? ownerNumberControl;
+
+  boolean mozIsTextField(boolean aExcludePassword);
+
+  [ChromeOnly]
+  // This function will return null if @autocomplete is not defined for the
+  // current @type
+  AutocompleteInfo? getAutocompleteInfo();
+};
+
+[NoInterfaceObject]
+interface MozEditableElement {
+  [Pure, ChromeOnly]
+  readonly attribute nsIEditor? editor;
+
+  // This is similar to set .value on nsIDOMInput/TextAreaElements, but handling
+  // of the value change is closer to the normal user input, so 'change' event
+  // for example will be dispatched when focusing out the element.
+  [Func="IsChromeOrXBL", NeedsSubjectPrincipal]
+  void setUserInput(DOMString input);
+};
+
+HTMLInputElement implements MozEditableElement;
+
+partial interface HTMLInputElement {
+  [Pref="dom.input.dirpicker", SetterThrows]
+  attribute boolean allowdirs;
+
+  [Pref="dom.input.dirpicker"]
+  readonly attribute boolean isFilesAndDirectoriesSupported;
+
+  [Throws, Pref="dom.input.dirpicker"]
+  Promise<sequence<(File or Directory)>> getFilesAndDirectories();
+
+  [Throws, Pref="dom.input.dirpicker"]
+  Promise<sequence<File>> getFiles(optional boolean recursiveFlag = false);
+
+  [Throws, Pref="dom.input.dirpicker"]
+  void chooseDirectory();
+};
+
+HTMLInputElement implements MozImageLoadingContent;
+
+// Webkit/Blink
+partial interface HTMLInputElement {
+  [Pref="dom.webkitBlink.filesystem.enabled", Frozen, Cached, Pure]
+  readonly attribute sequence<FileSystemEntry> webkitEntries;
+
+  [Pref="dom.webkitBlink.dirPicker.enabled", BinaryName="WebkitDirectoryAttr", SetterThrows]
+          attribute boolean webkitdirectory;
+};
+
+dictionary DateTimeValue {
+  long hour;
+  long minute;
+  long year;
+  long month;
+  long day;
+};
+
+partial interface HTMLInputElement {
+  [Pref="dom.forms.datetime", ChromeOnly]
+  DateTimeValue getDateTimeInputBoxValue();
+
+  [Pref="dom.forms.datetime", ChromeOnly]
+  void updateDateTimeInputBox(optional DateTimeValue value);
+
+  [Pref="dom.forms.datetime", ChromeOnly]
+  void setDateTimePickerState(boolean open);
+
+  [Pref="dom.forms.datetime", ChromeOnly,
+   BinaryName="getMinimumAsDouble"]
+  double getMinimum();
+
+  [Pref="dom.forms.datetime", ChromeOnly,
+   BinaryName="getMaximumAsDouble"]
+  double getMaximum();
+
+  [Pref="dom.forms.datetime", Func="IsChromeOrXBL"]
+  void openDateTimePicker(optional DateTimeValue initialValue);
+
+  [Pref="dom.forms.datetime", Func="IsChromeOrXBL"]
+  void updateDateTimePicker(optional DateTimeValue value);
+
+  [Pref="dom.forms.datetime", Func="IsChromeOrXBL"]
+  void closeDateTimePicker();
+
+  [Pref="dom.forms.datetime", Func="IsChromeOrXBL"]
+  void setFocusState(boolean aIsFocused);
+
+  [Pref="dom.forms.datetime", Func="IsChromeOrXBL"]
+  void updateValidityState();
+
+  [Pref="dom.forms.datetime", Func="IsChromeOrXBL",
+   BinaryName="getStepAsDouble"]
+  double getStep();
+
+  [Pref="dom.forms.datetime", Func="IsChromeOrXBL",
+   BinaryName="getStepBaseAsDouble"]
+  double getStepBase();
+};
+
+partial interface HTMLInputElement {
+  [ChromeOnly]
+  attribute DOMString previewValue;
+};
diff --git a/crates/web-sys/webidls/available/HTMLLIElement.webidl b/crates/web-sys/webidls/available/HTMLLIElement.webidl
new file mode 100644
index 00000000..3f104d09
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLLIElement.webidl
@@ -0,0 +1,26 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-li-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-li-element
+[HTMLConstructor]
+interface HTMLLIElement : HTMLElement {
+           [CEReactions, SetterThrows, Pure]
+           attribute long value;
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLLIElement {
+           [CEReactions, SetterThrows, Pure]
+           attribute DOMString type;
+};
diff --git a/crates/web-sys/webidls/available/HTMLLabelElement.webidl b/crates/web-sys/webidls/available/HTMLLabelElement.webidl
new file mode 100644
index 00000000..4b624dfa
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLLabelElement.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[HTMLConstructor]
+interface HTMLLabelElement : HTMLElement {
+  readonly attribute HTMLFormElement? form;
+  [CEReactions]
+           attribute DOMString htmlFor;
+  readonly attribute HTMLElement? control;
+};
diff --git a/crates/web-sys/webidls/available/HTMLLegendElement.webidl b/crates/web-sys/webidls/available/HTMLLegendElement.webidl
new file mode 100644
index 00000000..6f03ecf1
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLLegendElement.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-legend-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-legend-element
+[HTMLConstructor]
+interface HTMLLegendElement : HTMLElement {
+  readonly attribute HTMLFormElement? form;
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLLegendElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString align;
+};
diff --git a/crates/web-sys/webidls/available/HTMLLinkElement.webidl b/crates/web-sys/webidls/available/HTMLLinkElement.webidl
new file mode 100644
index 00000000..0fc7890d
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLLinkElement.webidl
@@ -0,0 +1,59 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-link-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-link-element
+[HTMLConstructor]
+interface HTMLLinkElement : HTMLElement {
+  [Pure]
+           attribute boolean disabled;
+  [CEReactions, SetterNeedsSubjectPrincipal=NonSystem, SetterThrows, Pure]
+           attribute DOMString href;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString? crossOrigin;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString rel;
+  [PutForwards=value]
+  readonly attribute DOMTokenList relList;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString media;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString hreflang;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString type;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString referrerPolicy;
+  [PutForwards=value] readonly attribute DOMTokenList sizes;
+};
+HTMLLinkElement implements LinkStyle;
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLLinkElement {
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString charset;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString rev;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString target;
+};
+
+// https://w3c.github.io/webappsec/specs/subresourceintegrity/#htmllinkelement-1
+partial interface HTMLLinkElement {
+  [CEReactions, SetterThrows]
+  attribute DOMString integrity;
+};
+
+//https://w3c.github.io/preload/
+partial interface HTMLLinkElement {
+  [SetterThrows, Pure]
+           attribute DOMString as;
+};
diff --git a/crates/web-sys/webidls/available/HTMLMapElement.webidl b/crates/web-sys/webidls/available/HTMLMapElement.webidl
new file mode 100644
index 00000000..199c7087
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLMapElement.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-map-element
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-map-element
+[HTMLConstructor]
+interface HTMLMapElement : HTMLElement {
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString name;
+  [Constant]
+  readonly attribute HTMLCollection areas;
+  // Not supported yet.
+  //readonly attribute HTMLCollection images;
+};
diff --git a/crates/web-sys/webidls/available/HTMLMediaElement.webidl b/crates/web-sys/webidls/available/HTMLMediaElement.webidl
new file mode 100644
index 00000000..c33737e9
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLMediaElement.webidl
@@ -0,0 +1,221 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#media-elements
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+interface HTMLMediaElement : HTMLElement {
+
+  // error state
+  readonly attribute MediaError? error;
+
+  // network state
+  [CEReactions, SetterNeedsSubjectPrincipal=NonSystem, SetterThrows]
+           attribute DOMString src;
+  readonly attribute DOMString currentSrc;
+
+  [CEReactions, SetterThrows]
+           attribute DOMString? crossOrigin;
+  const unsigned short NETWORK_EMPTY = 0;
+  const unsigned short NETWORK_IDLE = 1;
+  const unsigned short NETWORK_LOADING = 2;
+  const unsigned short NETWORK_NO_SOURCE = 3;
+  readonly attribute unsigned short networkState;
+  [CEReactions, SetterThrows]
+           attribute DOMString preload;
+  [NewObject]
+  readonly attribute TimeRanges buffered;
+  void load();
+  DOMString canPlayType(DOMString type);
+
+  // ready state
+  const unsigned short HAVE_NOTHING = 0;
+  const unsigned short HAVE_METADATA = 1;
+  const unsigned short HAVE_CURRENT_DATA = 2;
+  const unsigned short HAVE_FUTURE_DATA = 3;
+  const unsigned short HAVE_ENOUGH_DATA = 4;
+  readonly attribute unsigned short readyState;
+  readonly attribute boolean seeking;
+
+  // playback state
+  [SetterThrows]
+           attribute double currentTime;
+  [Throws]
+  void fastSeek(double time);
+  readonly attribute unrestricted double duration;
+  [ChromeOnly]
+  readonly attribute boolean isEncrypted;
+  // TODO: Bug 847376 - readonly attribute any startDate;
+  readonly attribute boolean paused;
+  [SetterThrows]
+           attribute double defaultPlaybackRate;
+  [SetterThrows]
+           attribute double playbackRate;
+  [NewObject]
+  readonly attribute TimeRanges played;
+  [NewObject]
+  readonly attribute TimeRanges seekable;
+  readonly attribute boolean ended;
+  [CEReactions, SetterThrows]
+           attribute boolean autoplay;
+  [CEReactions, SetterThrows]
+           attribute boolean loop;
+  [Throws]
+  Promise<void> play();
+  [Throws]
+  void pause();
+
+  // TODO: Bug 847377 - mediaGroup and MediaController
+  // media controller
+  //         attribute DOMString mediaGroup;
+  //         attribute MediaController? controller;
+
+  // controls
+  [CEReactions, SetterThrows]
+           attribute boolean controls;
+  [SetterThrows]
+           attribute double volume;
+           attribute boolean muted;
+  [CEReactions, SetterThrows]
+           attribute boolean defaultMuted;
+
+  // TODO: Bug 847379
+  // tracks
+  [Pref="media.track.enabled"]
+  readonly attribute AudioTrackList audioTracks;
+  [Pref="media.track.enabled"]
+  readonly attribute VideoTrackList videoTracks;
+  readonly attribute TextTrackList? textTracks;
+  TextTrack addTextTrack(TextTrackKind kind,
+                         optional DOMString label = "",
+                         optional DOMString language = "");
+};
+
+// Mozilla extensions:
+partial interface HTMLMediaElement {
+  [Func="HasDebuggerOrTabsPrivilege"]
+  readonly attribute MediaSource? mozMediaSourceObject;
+  [Func="HasDebuggerOrTabsPrivilege"]
+  readonly attribute DOMString mozDebugReaderData;
+  [Func="HasDebuggerOrTabsPrivilege", NewObject]
+  Promise<DOMString> mozRequestDebugInfo();
+
+  [Func="HasDebuggerOrTabsPrivilege", NewObject]
+  static void mozEnableDebugLog();
+  [Func="HasDebuggerOrTabsPrivilege", NewObject]
+  Promise<DOMString> mozRequestDebugLog();
+
+  [Pref="media.test.dumpDebugInfo"]
+  Promise<void> mozDumpDebugInfo();
+
+  attribute MediaStream? srcObject;
+
+  attribute boolean mozPreservesPitch;
+
+  // NB: for internal use with the video controls:
+  [Func="IsChromeOrXBL"] attribute boolean mozAllowCasting;
+  [Func="IsChromeOrXBL"] attribute boolean mozIsCasting;
+
+  // Mozilla extension: stream capture
+  [Throws]
+  MediaStream mozCaptureStream();
+  [Throws]
+  MediaStream mozCaptureStreamUntilEnded();
+  readonly attribute boolean mozAudioCaptured;
+
+  // Mozilla extension: return embedded metadata from the stream as a
+  // JSObject with key:value pairs for each tag. This can be used by
+  // player interfaces to display the song title, artist, etc.
+  [Throws]
+  object? mozGetMetadata();
+
+  // Mozilla extension: provides access to the fragment end time if
+  // the media element has a fragment URI for the currentSrc, otherwise
+  // it is equal to the media duration.
+  readonly attribute double mozFragmentEnd;
+
+  [ChromeOnly]
+  void reportCanPlayTelemetry();
+};
+
+// Encrypted Media Extensions
+partial interface HTMLMediaElement {
+  readonly attribute MediaKeys? mediaKeys;
+
+  // void, not any: https://www.w3.org/Bugs/Public/show_bug.cgi?id=26457
+  [NewObject]
+  Promise<void> setMediaKeys(MediaKeys? mediaKeys);
+
+  attribute EventHandler onencrypted;
+
+  attribute EventHandler onwaitingforkey;
+};
+
+// This is just for testing
+partial interface HTMLMediaElement {
+  [Pref="media.useAudioChannelService.testing"]
+  readonly attribute double computedVolume;
+  [Pref="media.useAudioChannelService.testing"]
+  readonly attribute boolean computedMuted;
+  [Pref="media.useAudioChannelService.testing"]
+  readonly attribute unsigned long computedSuspended;
+};
+
+/*
+ * HTMLMediaElement::seekToNextFrame() is a Mozilla experimental feature.
+ *
+ * The SeekToNextFrame() method provides a way to access a video element's video
+ * frames one by one without going through the realtime playback. So, it lets
+ * authors use "frame" as unit to access the video element's underlying data,
+ * instead of "time".
+ *
+ * The SeekToNextFrame() is a kind of seek operation, so normally, once it is
+ * invoked, a "seeking" event is dispatched. However, if the media source has no
+ * video data or is not seekable, the operation is ignored without filing the
+ * "seeking" event.
+ *
+ * Once the SeekToNextFrame() is done, a "seeked" event should always be filed
+ * and a "ended" event might also be filed depends on where the media element's
+ * position before seeking was. There are two cases:
+ * Assume the media source has n+1 video frames where n is a non-negative
+ * integers and the frame sequence is indexed from zero.
+ * (1) If the currentTime is at anywhere smaller than the n-th frame's beginning
+ *     time, say the currentTime is now pointing to a position which is smaller
+ *     than the x-th frame's beginning time and larger or equal to the (x-1)-th
+ *     frame's beginning time, where x belongs to [1, n], then the
+ *     SeekToNextFrame() operation seeks the media to the x-th frame, sets the
+ *     media's currentTime to the x-th frame's beginning time and dispatches a
+ *     "seeked" event.
+ * (2) Otherwise, if the currentTime is larger or equal to the n-th frame's
+ *     beginning time, then the SeekToNextFrame() operation sets the media's
+ *     currentTime to the duration of the media source and dispatches a "seeked"
+ *     event and an "ended" event.
+ */
+partial interface HTMLMediaElement {
+  [Throws, Pref="media.seekToNextFrame.enabled"]
+  Promise<void> seekToNextFrame();
+};
+
+/*
+ * This is an API for simulating visibility changes to help debug and write
+ * tests about suspend-video-decoding.
+ *
+ * - SetVisible() is for simulating visibility changes.
+ * - HasSuspendTaint() is for querying that the element's decoder cannot suspend
+ *   video decoding because it has been tainted by an operation, such as
+ *   drawImage().
+ */
+partial interface HTMLMediaElement {
+  [Pref="media.test.video-suspend"]
+  void setVisible(boolean aVisible);
+
+  [Pref="media.test.video-suspend"]
+  boolean hasSuspendTaint();
+};
diff --git a/crates/web-sys/webidls/available/HTMLMenuElement.webidl b/crates/web-sys/webidls/available/HTMLMenuElement.webidl
new file mode 100644
index 00000000..1194226c
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLMenuElement.webidl
@@ -0,0 +1,60 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-menu-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+interface MenuBuilder;
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-menu-element
+[HTMLConstructor]
+interface HTMLMenuElement : HTMLElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString type;
+           [CEReactions, SetterThrows]
+           attribute DOMString label;
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLMenuElement {
+           [CEReactions, SetterThrows]
+           attribute boolean compact;
+};
+
+// Mozilla specific stuff
+partial interface HTMLMenuElement {
+  /**
+   * Creates and dispatches a trusted event named "show".
+   * The event is not cancelable and does not bubble.
+   * See http://www.whatwg.org/specs/web-apps/current-work/multipage/interactive-elements.html#context-menus
+   */
+  [ChromeOnly]
+  void sendShowEvent();
+
+  /**
+   * Creates a native menu builder. The builder type is dependent on menu type.
+   * Currently, it returns the @mozilla.org/content/html-menu-builder;1
+   * component. Toolbar menus are not yet supported (the method returns null).
+   */
+  [ChromeOnly]
+  MenuBuilder? createBuilder();
+
+  /*
+   * Builds a menu by iterating over menu children.
+   * See http://www.whatwg.org/specs/web-apps/current-work/multipage/interactive-elements.html#building-menus-and-toolbars
+   * The caller can use a native builder by calling createBuilder() or provide
+   * a custom builder that implements the nsIMenuBuilder interface.
+   * A custom builder can be used for example to build native context menus
+   * that are not defined using <menupopup>.
+   */
+  [ChromeOnly]
+  void build(MenuBuilder aBuilder);
+};
diff --git a/crates/web-sys/webidls/available/HTMLMenuItemElement.webidl b/crates/web-sys/webidls/available/HTMLMenuItemElement.webidl
new file mode 100644
index 00000000..648188e2
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLMenuItemElement.webidl
@@ -0,0 +1,37 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-menuitem-element
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-menuitem-element
+[HTMLConstructor]
+interface HTMLMenuItemElement : HTMLElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString type;
+           [CEReactions, SetterThrows]
+           attribute DOMString label;
+           [CEReactions, SetterThrows]
+           attribute DOMString icon;
+           [CEReactions, SetterThrows]
+           attribute boolean disabled;
+           [CEReactions]
+           attribute boolean checked;
+           [CEReactions, SetterThrows]
+           attribute DOMString radiogroup;
+
+           // This should be 'default' but in the IDL implementation
+           // this has been renamed 'defaultChecked'.
+           [CEReactions, SetterThrows]
+           attribute boolean defaultChecked;
+
+           // Currently not implemented.
+//  readonly attribute HTMLElement? command;
+};
diff --git a/crates/web-sys/webidls/available/HTMLMetaElement.webidl b/crates/web-sys/webidls/available/HTMLMetaElement.webidl
new file mode 100644
index 00000000..30014a95
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLMetaElement.webidl
@@ -0,0 +1,29 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-meta-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-meta-element
+[HTMLConstructor]
+interface HTMLMetaElement : HTMLElement {
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString name;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString httpEquiv;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString content;
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLMetaElement {
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString scheme;
+};
diff --git a/crates/web-sys/webidls/available/HTMLMeterElement.webidl b/crates/web-sys/webidls/available/HTMLMeterElement.webidl
new file mode 100644
index 00000000..5db5b660
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLMeterElement.webidl
@@ -0,0 +1,30 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-meter-element	
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-meter-element
+[HTMLConstructor]
+interface HTMLMeterElement : HTMLElement {
+           [CEReactions, SetterThrows]
+           attribute double value;
+           [CEReactions, SetterThrows]
+           attribute double min;
+           [CEReactions, SetterThrows]
+           attribute double max;
+           [CEReactions, SetterThrows]
+           attribute double low;
+           [CEReactions, SetterThrows]
+           attribute double high;
+           [CEReactions, SetterThrows]
+           attribute double optimum;
+           readonly attribute NodeList labels;
+};
diff --git a/crates/web-sys/webidls/available/HTMLModElement.webidl b/crates/web-sys/webidls/available/HTMLModElement.webidl
new file mode 100644
index 00000000..8ed8b994
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLModElement.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#attributes-common-to-ins-and-del-elements
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#attributes-common-to-ins-and-del-elements
+[HTMLConstructor]
+interface HTMLModElement : HTMLElement {
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString cite;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString dateTime;
+};
diff --git a/crates/web-sys/webidls/available/HTMLOListElement.webidl b/crates/web-sys/webidls/available/HTMLOListElement.webidl
new file mode 100644
index 00000000..93084c22
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLOListElement.webidl
@@ -0,0 +1,30 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-ol-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-ol-element
+[HTMLConstructor]
+interface HTMLOListElement : HTMLElement {
+           [CEReactions, SetterThrows]
+           attribute boolean reversed;
+           [CEReactions, SetterThrows]
+           attribute long start;
+           [CEReactions, SetterThrows]
+           attribute DOMString type;
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLOListElement {
+           [CEReactions, SetterThrows]
+           attribute boolean compact;
+};
diff --git a/crates/web-sys/webidls/available/HTMLObjectElement.webidl b/crates/web-sys/webidls/available/HTMLObjectElement.webidl
new file mode 100644
index 00000000..b5bcddc8
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLObjectElement.webidl
@@ -0,0 +1,231 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-object-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#HTMLObjectElement-partial
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-object-element
+[HTMLConstructor, NeedResolve]
+interface HTMLObjectElement : HTMLElement {
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString data;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString type;
+  [CEReactions, Pure, SetterThrows]
+           attribute boolean typeMustMatch;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString name;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString useMap;
+  [Pure]
+  readonly attribute HTMLFormElement? form;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString width;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString height;
+  // Not pure: can trigger about:blank instantiation
+  [NeedsSubjectPrincipal]
+  readonly attribute Document? contentDocument;
+  // Not pure: can trigger about:blank instantiation
+  [NeedsSubjectPrincipal]
+  readonly attribute WindowProxy? contentWindow;
+
+  readonly attribute boolean willValidate;
+  readonly attribute ValidityState validity;
+  [Throws]
+  readonly attribute DOMString validationMessage;
+  boolean checkValidity();
+  boolean reportValidity();
+  void setCustomValidity(DOMString error);
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#HTMLObjectElement-partial
+partial interface HTMLObjectElement {
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString align;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString archive;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString code;
+  [CEReactions, Pure, SetterThrows]
+           attribute boolean declare;
+  [CEReactions, Pure, SetterThrows]
+           attribute unsigned long hspace;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString standby;
+  [CEReactions, Pure, SetterThrows]
+           attribute unsigned long vspace;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString codeBase;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString codeType;
+
+  [CEReactions, TreatNullAs=EmptyString, Pure, SetterThrows]
+           attribute DOMString border;
+};
+
+partial interface HTMLObjectElement {
+  // GetSVGDocument
+  [NeedsSubjectPrincipal]
+  Document? getSVGDocument();
+};
+
+[NoInterfaceObject]
+interface MozObjectLoadingContent {
+  // Mirrored chrome-only scriptable nsIObjectLoadingContent methods.  Please
+  // make sure to update this list if nsIObjectLoadingContent changes.  Also,
+  // make sure everything on here is [ChromeOnly].
+  [ChromeOnly]
+  const unsigned long TYPE_LOADING     = 0;
+  [ChromeOnly]
+  const unsigned long TYPE_IMAGE       = 1;
+  [ChromeOnly]
+  const unsigned long TYPE_PLUGIN      = 2;
+  [ChromeOnly]
+  const unsigned long TYPE_FAKE_PLUGIN = 3;
+  [ChromeOnly]
+  const unsigned long TYPE_DOCUMENT    = 4;
+  [ChromeOnly]
+  const unsigned long TYPE_NULL        = 5;
+
+  // The content type is not supported (e.g. plugin not installed)
+  [ChromeOnly]
+  const unsigned long PLUGIN_UNSUPPORTED          = 0;
+  // Showing alternate content
+  [ChromeOnly]
+  const unsigned long PLUGIN_ALTERNATE            = 1;
+  // The plugin exists, but is disabled
+  [ChromeOnly]
+  const unsigned long PLUGIN_DISABLED             = 2;
+  // The plugin is blocklisted and disabled
+  [ChromeOnly]
+  const unsigned long PLUGIN_BLOCKLISTED          = 3;
+  // The plugin is considered outdated, but not disabled
+  [ChromeOnly]
+  const unsigned long PLUGIN_OUTDATED             = 4;
+  // The plugin has crashed
+  [ChromeOnly]
+  const unsigned long PLUGIN_CRASHED              = 5;
+  // Suppressed by security policy
+  [ChromeOnly]
+  const unsigned long PLUGIN_SUPPRESSED           = 6;
+  // Blocked by content policy
+  [ChromeOnly]
+  const unsigned long PLUGIN_USER_DISABLED        = 7;
+  /// ** All values >= PLUGIN_CLICK_TO_PLAY are plugin placeholder types that
+  ///    would be replaced by a real plugin if activated (playPlugin())
+  /// ** Furthermore, values >= PLUGIN_CLICK_TO_PLAY and
+  ///    <= PLUGIN_VULNERABLE_NO_UPDATE are click-to-play types.
+  // The plugin is disabled until the user clicks on it
+  [ChromeOnly]
+  const unsigned long PLUGIN_CLICK_TO_PLAY        = 8;
+  // The plugin is vulnerable (update available)
+  [ChromeOnly]
+  const unsigned long PLUGIN_VULNERABLE_UPDATABLE = 9;
+  // The plugin is vulnerable (no update available)
+  [ChromeOnly]
+  const unsigned long PLUGIN_VULNERABLE_NO_UPDATE = 10;
+
+  /**
+   * The actual mime type (the one we got back from the network
+   * request) for the element.
+   */
+  [ChromeOnly]
+  readonly attribute DOMString actualType;
+
+  /**
+   * Gets the type of the content that's currently loaded. See
+   * the constants above for the list of possible values.
+   */
+  [ChromeOnly]
+  readonly attribute unsigned long displayedType;
+
+  /**
+   * Gets the content type that corresponds to the give MIME type.  See the
+   * constants above for the list of possible values.  If nothing else fits,
+   * TYPE_NULL will be returned.
+   */
+  [ChromeOnly]
+  unsigned long getContentTypeForMIMEType(DOMString aMimeType);
+
+
+  [ChromeOnly]
+  sequence<MozPluginParameter> getPluginAttributes();
+
+  [ChromeOnly]
+  sequence<MozPluginParameter> getPluginParameters();
+
+  /**
+   * This method will play a plugin that has been stopped by the click-to-play
+   * feature.
+   */
+  [ChromeOnly, Throws, NeedsCallerType]
+  void playPlugin();
+
+  /**
+   * Forces a re-evaluation and reload of the tag, optionally invalidating its
+   * click-to-play state.  This can be used when the MIME type that provides a
+   * type has changed, for instance, to force the tag to re-evalulate the
+   * handler to use.
+   */
+  [ChromeOnly, Throws]
+  void reload(boolean aClearActivation);
+
+  /**
+   * This attribute will return true if the current content type has been
+   * activated, either explicitly or by passing checks that would have it be
+   * click-to-play.
+   */
+  [ChromeOnly]
+  readonly attribute boolean activated;
+
+  /**
+   * The URL of the data/src loaded in the object. This may be null (i.e.
+   * an <embed> with no src).
+   */
+  [ChromeOnly]
+  readonly attribute URI? srcURI;
+
+  [ChromeOnly]
+  readonly attribute unsigned long defaultFallbackType;
+
+  [ChromeOnly]
+  readonly attribute unsigned long pluginFallbackType;
+
+  /**
+   * If this object currently owns a running plugin, regardless of whether or
+   * not one is pending spawn/despawn.
+   */
+  [ChromeOnly]
+  readonly attribute boolean hasRunningPlugin;
+
+  /**
+   * Disable the use of fake plugins and reload the tag if necessary
+   */
+  [ChromeOnly, Throws]
+  void skipFakePlugins();
+
+  [ChromeOnly, Throws, NeedsCallerType]
+  readonly attribute unsigned long runID;
+};
+
+/**
+ * Name:Value pair type used for passing parameters to NPAPI or javascript
+ * plugins.
+ */
+dictionary MozPluginParameter {
+  DOMString name = "";
+  DOMString value = "";
+};
+
+HTMLObjectElement implements MozImageLoadingContent;
+HTMLObjectElement implements MozFrameLoaderOwner;
+HTMLObjectElement implements MozObjectLoadingContent;
diff --git a/crates/web-sys/webidls/available/HTMLOptGroupElement.webidl b/crates/web-sys/webidls/available/HTMLOptGroupElement.webidl
new file mode 100644
index 00000000..d46fb869
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLOptGroupElement.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-optgroup-element
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[HTMLConstructor]
+interface HTMLOptGroupElement : HTMLElement {
+           [CEReactions, SetterThrows]
+           attribute boolean disabled;
+           [CEReactions, SetterThrows]
+           attribute DOMString label;
+};
diff --git a/crates/web-sys/webidls/available/HTMLOptionElement.webidl b/crates/web-sys/webidls/available/HTMLOptionElement.webidl
new file mode 100644
index 00000000..415f6fdd
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLOptionElement.webidl
@@ -0,0 +1,30 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-option-element
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[HTMLConstructor, NamedConstructor=Option(optional DOMString text = "", optional DOMString value, optional boolean defaultSelected = false, optional boolean selected = false)]
+interface HTMLOptionElement : HTMLElement {
+  [CEReactions, SetterThrows]
+  attribute boolean disabled;
+  readonly attribute HTMLFormElement? form;
+  [CEReactions, SetterThrows]
+  attribute DOMString label;
+  [CEReactions, SetterThrows]
+  attribute boolean defaultSelected;
+  attribute boolean selected;
+  [CEReactions, SetterThrows]
+  attribute DOMString value;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString text;
+  readonly attribute long index;
+};
diff --git a/crates/web-sys/webidls/available/HTMLOptionsCollection.webidl b/crates/web-sys/webidls/available/HTMLOptionsCollection.webidl
new file mode 100644
index 00000000..9e2cc06a
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLOptionsCollection.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/2012/WD-html5-20120329/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface HTMLOptionsCollection : HTMLCollection {
+  [CEReactions, SetterThrows]
+  attribute unsigned long length;
+  [CEReactions, Throws]
+  setter void (unsigned long index, HTMLOptionElement? option);
+  [CEReactions, Throws]
+  void add((HTMLOptionElement or HTMLOptGroupElement) element, optional (HTMLElement or long)? before = null);
+  [CEReactions, Throws]
+  void remove(long index);
+  [Throws]
+  attribute long selectedIndex;
+};
diff --git a/crates/web-sys/webidls/available/HTMLOutputElement.webidl b/crates/web-sys/webidls/available/HTMLOutputElement.webidl
new file mode 100644
index 00000000..61590153
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLOutputElement.webidl
@@ -0,0 +1,39 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-output-element
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-output-element
+[HTMLConstructor]
+interface HTMLOutputElement : HTMLElement {
+  [PutForwards=value, Constant]
+  readonly attribute DOMTokenList htmlFor;
+  readonly attribute HTMLFormElement? form;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString name;
+
+  [Constant]
+  readonly attribute DOMString type;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString defaultValue;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString value;
+
+  readonly attribute boolean willValidate;
+  readonly attribute ValidityState validity;
+  [Throws]
+  readonly attribute DOMString validationMessage;
+  boolean checkValidity();
+  boolean reportValidity();
+  void setCustomValidity(DOMString error);
+
+  readonly attribute NodeList labels;
+};
diff --git a/crates/web-sys/webidls/available/HTMLParagraphElement.webidl b/crates/web-sys/webidls/available/HTMLParagraphElement.webidl
new file mode 100644
index 00000000..289af4c9
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLParagraphElement.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-p-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-p-element
+[HTMLConstructor]
+interface HTMLParagraphElement : HTMLElement {
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLParagraphElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString align;
+};
diff --git a/crates/web-sys/webidls/available/HTMLParamElement.webidl b/crates/web-sys/webidls/available/HTMLParamElement.webidl
new file mode 100644
index 00000000..cf6b5a35
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLParamElement.webidl
@@ -0,0 +1,30 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-param-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-param-element
+[HTMLConstructor]
+interface HTMLParamElement : HTMLElement {
+           [CEReactions, SetterThrows, Pure]
+           attribute DOMString name;
+           [CEReactions, SetterThrows, Pure]
+           attribute DOMString value;
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLParamElement {
+           [CEReactions, SetterThrows, Pure]
+           attribute DOMString type;
+           [CEReactions, SetterThrows, Pure]
+           attribute DOMString valueType;
+};
diff --git a/crates/web-sys/webidls/available/HTMLPictureElement.webidl b/crates/web-sys/webidls/available/HTMLPictureElement.webidl
new file mode 100644
index 00000000..387eee78
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLPictureElement.webidl
@@ -0,0 +1,9 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[HTMLConstructor]
+interface HTMLPictureElement : HTMLElement {
+};
diff --git a/crates/web-sys/webidls/available/HTMLPreElement.webidl b/crates/web-sys/webidls/available/HTMLPreElement.webidl
new file mode 100644
index 00000000..6929cd53
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLPreElement.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-pre-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-pre-element
+[HTMLConstructor]
+interface HTMLPreElement : HTMLElement {
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLPreElement {
+           [CEReactions, SetterThrows]
+           attribute long width;
+};
diff --git a/crates/web-sys/webidls/available/HTMLProgressElement.webidl b/crates/web-sys/webidls/available/HTMLProgressElement.webidl
new file mode 100644
index 00000000..564b9f2a
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLProgressElement.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-progress-element
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[HTMLConstructor]
+interface HTMLProgressElement : HTMLElement {
+           [CEReactions, SetterThrows]
+           attribute double value;
+           [CEReactions, SetterThrows]
+           attribute double max;
+  readonly attribute double position;
+  readonly attribute NodeList labels;
+};
diff --git a/crates/web-sys/webidls/available/HTMLQuoteElement.webidl b/crates/web-sys/webidls/available/HTMLQuoteElement.webidl
new file mode 100644
index 00000000..c999b147
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLQuoteElement.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-blockquote-element
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-blockquote-element
+[HTMLConstructor]
+interface HTMLQuoteElement : HTMLElement {
+           [CEReactions, SetterThrows, Pure]
+           attribute DOMString cite;
+};
+
diff --git a/crates/web-sys/webidls/available/HTMLScriptElement.webidl b/crates/web-sys/webidls/available/HTMLScriptElement.webidl
new file mode 100644
index 00000000..8a23ec61
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLScriptElement.webidl
@@ -0,0 +1,43 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-script-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ */
+
+[HTMLConstructor]
+interface HTMLScriptElement : HTMLElement {
+  [CEReactions, SetterNeedsSubjectPrincipal=NonSystem, SetterThrows]
+  attribute DOMString src;
+  [CEReactions, SetterThrows]
+  attribute DOMString type;
+  [CEReactions, SetterThrows, Pref="dom.moduleScripts.enabled"]
+  attribute boolean noModule;
+  [CEReactions, SetterThrows]
+  attribute DOMString charset;
+  [CEReactions, SetterThrows]
+  attribute boolean async;
+  [CEReactions, SetterThrows]
+  attribute boolean defer;
+  [CEReactions, SetterThrows]
+  attribute DOMString? crossOrigin;
+  [CEReactions, Throws]
+  attribute DOMString text;
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLScriptElement {
+  [CEReactions, SetterThrows]
+  attribute DOMString event;
+  [CEReactions, SetterThrows]
+  attribute DOMString htmlFor;
+};
+
+// https://w3c.github.io/webappsec/specs/subresourceintegrity/#htmlscriptelement-1
+partial interface HTMLScriptElement {
+  [CEReactions, SetterThrows]
+  attribute DOMString integrity;
+};
diff --git a/crates/web-sys/webidls/available/HTMLSelectElement.webidl b/crates/web-sys/webidls/available/HTMLSelectElement.webidl
new file mode 100644
index 00000000..115b305e
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLSelectElement.webidl
@@ -0,0 +1,75 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/html/#the-select-element
+ */
+
+[HTMLConstructor]
+interface HTMLSelectElement : HTMLElement {
+  [CEReactions, SetterThrows, Pure]
+  attribute boolean autofocus;
+  [CEReactions, SetterThrows, Pure]
+  attribute DOMString autocomplete;
+  [CEReactions, SetterThrows, Pure]
+  attribute boolean disabled;
+  [Pure]
+  readonly attribute HTMLFormElement? form;
+  [CEReactions, SetterThrows, Pure]
+  attribute boolean multiple;
+  [CEReactions, SetterThrows, Pure]
+  attribute DOMString name;
+  [CEReactions, SetterThrows, Pure]
+  attribute boolean required;
+  [CEReactions, SetterThrows, Pure]
+  attribute unsigned long size;
+
+  [Pure]
+  readonly attribute DOMString type;
+
+  [Constant]
+  readonly attribute HTMLOptionsCollection options;
+  [CEReactions, SetterThrows, Pure]
+  attribute unsigned long length;
+  getter Element? item(unsigned long index);
+  HTMLOptionElement? namedItem(DOMString name);
+  [CEReactions, Throws]
+  void add((HTMLOptionElement or HTMLOptGroupElement) element, optional (HTMLElement or long)? before = null);
+  [CEReactions]
+  void remove(long index);
+  [CEReactions, Throws]
+  setter void (unsigned long index, HTMLOptionElement? option);
+
+  readonly attribute HTMLCollection selectedOptions;
+  [SetterThrows, Pure]
+  attribute long selectedIndex;
+  [Pure]
+  attribute DOMString value;
+
+  readonly attribute boolean willValidate;
+  readonly attribute ValidityState validity;
+  [Throws]
+  readonly attribute DOMString validationMessage;
+  boolean checkValidity();
+  boolean reportValidity();
+  void setCustomValidity(DOMString error);
+
+  readonly attribute NodeList labels;
+
+  // https://www.w3.org/Bugs/Public/show_bug.cgi?id=20720
+  [CEReactions]
+  void remove();
+};
+
+// Chrome only interface
+
+partial interface HTMLSelectElement {
+  [ChromeOnly]
+  attribute boolean openInParentProcess;
+  [ChromeOnly]
+  AutocompleteInfo getAutocompleteInfo();
+  [ChromeOnly]
+  attribute DOMString previewValue;
+};
diff --git a/crates/web-sys/webidls/available/HTMLSlotElement.webidl b/crates/web-sys/webidls/available/HTMLSlotElement.webidl
new file mode 100644
index 00000000..c4a4f6b1
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLSlotElement.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://html.spec.whatwg.org/multipage/forms.html#the-dialog-element
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Func="nsDocument::IsShadowDOMEnabled", Exposed=Window, HTMLConstructor]
+interface HTMLSlotElement : HTMLElement {
+  [CEReactions, SetterThrows] attribute DOMString name;
+  sequence<Node> assignedNodes(optional AssignedNodesOptions options);
+};
+
+dictionary AssignedNodesOptions {
+  boolean flatten = false;
+};
diff --git a/crates/web-sys/webidls/available/HTMLSourceElement.webidl b/crates/web-sys/webidls/available/HTMLSourceElement.webidl
new file mode 100644
index 00000000..8cd2ed07
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLSourceElement.webidl
@@ -0,0 +1,29 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-source-element
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[HTMLConstructor]
+interface HTMLSourceElement : HTMLElement {
+           [CEReactions, SetterNeedsSubjectPrincipal=NonSystem, SetterThrows]
+           attribute DOMString src;
+           [CEReactions, SetterThrows]
+           attribute DOMString type;
+};
+
+partial interface HTMLSourceElement {
+           [CEReactions, SetterNeedsSubjectPrincipal=NonSystem, SetterThrows]
+           attribute DOMString srcset;
+           [CEReactions, SetterThrows]
+           attribute DOMString sizes;
+           [CEReactions, SetterThrows]
+           attribute DOMString media;
+};
diff --git a/crates/web-sys/webidls/available/HTMLSpanElement.webidl b/crates/web-sys/webidls/available/HTMLSpanElement.webidl
new file mode 100644
index 00000000..6f65cdfb
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLSpanElement.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-span-element
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-span-element
+[HTMLConstructor]
+interface HTMLSpanElement : HTMLElement {};
diff --git a/crates/web-sys/webidls/available/HTMLStyleElement.webidl b/crates/web-sys/webidls/available/HTMLStyleElement.webidl
new file mode 100644
index 00000000..c0c8b985
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLStyleElement.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-style-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ */
+
+[HTMLConstructor]
+interface HTMLStyleElement : HTMLElement {
+           [Pure]
+           attribute boolean disabled;
+           [CEReactions, SetterThrows, Pure]
+           attribute DOMString media;
+           [CEReactions, SetterThrows, Pure]
+           attribute DOMString type;
+};
+HTMLStyleElement implements LinkStyle;
+
diff --git a/crates/web-sys/webidls/available/HTMLTableCaptionElement.webidl b/crates/web-sys/webidls/available/HTMLTableCaptionElement.webidl
new file mode 100644
index 00000000..48c9d354
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLTableCaptionElement.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[HTMLConstructor]
+interface HTMLTableCaptionElement : HTMLElement {};
+
+partial interface HTMLTableCaptionElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString align;
+};
diff --git a/crates/web-sys/webidls/available/HTMLTableCellElement.webidl b/crates/web-sys/webidls/available/HTMLTableCellElement.webidl
new file mode 100644
index 00000000..aff94914
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLTableCellElement.webidl
@@ -0,0 +1,53 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[HTMLConstructor]
+interface HTMLTableCellElement : HTMLElement {
+           [CEReactions, SetterThrows]
+           attribute unsigned long colSpan;
+           [CEReactions, SetterThrows]
+           attribute unsigned long rowSpan;
+  //[PutForwards=value] readonly attribute DOMTokenList headers;
+           [CEReactions, SetterThrows]
+           attribute DOMString headers;
+  readonly attribute long cellIndex;
+
+  // Mozilla-specific extensions
+           [CEReactions, SetterThrows]
+           attribute DOMString abbr;
+           [CEReactions, SetterThrows]
+           attribute DOMString scope;
+};
+
+partial interface HTMLTableCellElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString align;
+           [CEReactions, SetterThrows]
+           attribute DOMString axis;
+           [CEReactions, SetterThrows]
+           attribute DOMString height;
+           [CEReactions, SetterThrows]
+           attribute DOMString width;
+
+           [CEReactions, SetterThrows]
+           attribute DOMString ch;
+           [CEReactions, SetterThrows]
+           attribute DOMString chOff;
+           [CEReactions, SetterThrows]
+           attribute boolean noWrap;
+           [CEReactions, SetterThrows]
+           attribute DOMString vAlign;
+
+  [CEReactions, TreatNullAs=EmptyString, SetterThrows]
+           attribute DOMString bgColor;
+};
diff --git a/crates/web-sys/webidls/available/HTMLTableColElement.webidl b/crates/web-sys/webidls/available/HTMLTableColElement.webidl
new file mode 100644
index 00000000..02be4590
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLTableColElement.webidl
@@ -0,0 +1,31 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[HTMLConstructor]
+interface HTMLTableColElement : HTMLElement {
+           [CEReactions, SetterThrows]
+           attribute unsigned long span;
+};
+
+partial interface HTMLTableColElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString align;
+           [CEReactions, SetterThrows]
+           attribute DOMString ch;
+           [CEReactions, SetterThrows]
+           attribute DOMString chOff;
+           [CEReactions, SetterThrows]
+           attribute DOMString vAlign;
+           [CEReactions, SetterThrows]
+           attribute DOMString width;
+};
diff --git a/crates/web-sys/webidls/available/HTMLTableElement.webidl b/crates/web-sys/webidls/available/HTMLTableElement.webidl
new file mode 100644
index 00000000..f81e0004
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLTableElement.webidl
@@ -0,0 +1,62 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[HTMLConstructor]
+interface HTMLTableElement : HTMLElement {
+           [CEReactions, SetterThrows]
+           attribute HTMLTableCaptionElement? caption;
+  HTMLElement createCaption();
+  [CEReactions]
+  void deleteCaption();
+           [CEReactions, SetterThrows]
+           attribute HTMLTableSectionElement? tHead;
+  HTMLElement createTHead();
+  [CEReactions]
+  void deleteTHead();
+           [CEReactions, SetterThrows]
+           attribute HTMLTableSectionElement? tFoot;
+  HTMLElement createTFoot();
+  [CEReactions]
+  void deleteTFoot();
+  readonly attribute HTMLCollection tBodies;
+  HTMLElement createTBody();
+  readonly attribute HTMLCollection rows;
+  [Throws]
+  HTMLElement insertRow(optional long index = -1);
+  [CEReactions, Throws]
+  void deleteRow(long index);
+  //         attribute boolean sortable;
+  //void stopSorting();
+};
+
+partial interface HTMLTableElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString align;
+           [CEReactions, SetterThrows]
+           attribute DOMString border;
+           [CEReactions, SetterThrows]
+           attribute DOMString frame;
+           [CEReactions, SetterThrows]
+           attribute DOMString rules;
+           [CEReactions, SetterThrows]
+           attribute DOMString summary;
+           [CEReactions, SetterThrows]
+           attribute DOMString width;
+
+  [CEReactions, TreatNullAs=EmptyString, SetterThrows]
+           attribute DOMString bgColor;
+  [CEReactions, TreatNullAs=EmptyString, SetterThrows]
+           attribute DOMString cellPadding;
+  [CEReactions, TreatNullAs=EmptyString, SetterThrows]
+           attribute DOMString cellSpacing;
+};
diff --git a/crates/web-sys/webidls/available/HTMLTableRowElement.webidl b/crates/web-sys/webidls/available/HTMLTableRowElement.webidl
new file mode 100644
index 00000000..9a204f9a
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLTableRowElement.webidl
@@ -0,0 +1,37 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[HTMLConstructor]
+interface HTMLTableRowElement : HTMLElement {
+  readonly attribute long rowIndex;
+  readonly attribute long sectionRowIndex;
+  readonly attribute HTMLCollection cells;
+  [Throws]
+  HTMLElement insertCell(optional long index = -1);
+  [CEReactions, Throws]
+  void deleteCell(long index);
+};
+
+partial interface HTMLTableRowElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString align;
+           [CEReactions, SetterThrows]
+           attribute DOMString ch;
+           [CEReactions, SetterThrows]
+           attribute DOMString chOff;
+           [CEReactions, SetterThrows]
+           attribute DOMString vAlign;
+
+  [CEReactions, TreatNullAs=EmptyString, SetterThrows]
+           attribute DOMString bgColor;
+};
diff --git a/crates/web-sys/webidls/available/HTMLTableSectionElement.webidl b/crates/web-sys/webidls/available/HTMLTableSectionElement.webidl
new file mode 100644
index 00000000..a71682fc
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLTableSectionElement.webidl
@@ -0,0 +1,32 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[HTMLConstructor]
+interface HTMLTableSectionElement : HTMLElement {
+  readonly attribute HTMLCollection rows;
+  [Throws]
+  HTMLElement insertRow(optional long index = -1);
+  [CEReactions, Throws]
+  void deleteRow(long index);
+};
+
+partial interface HTMLTableSectionElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString align;
+           [CEReactions, SetterThrows]
+           attribute DOMString ch;
+           [CEReactions, SetterThrows]
+           attribute DOMString chOff;
+           [CEReactions, SetterThrows]
+           attribute DOMString vAlign;
+};
diff --git a/crates/web-sys/webidls/available/HTMLTemplateElement.webidl b/crates/web-sys/webidls/available/HTMLTemplateElement.webidl
new file mode 100644
index 00000000..f77eeaa4
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLTemplateElement.webidl
@@ -0,0 +1,16 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/templates/index.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[HTMLConstructor]
+interface HTMLTemplateElement : HTMLElement {
+    readonly attribute DocumentFragment content;
+};
+
diff --git a/crates/web-sys/webidls/available/HTMLTextAreaElement.webidl b/crates/web-sys/webidls/available/HTMLTextAreaElement.webidl
new file mode 100644
index 00000000..026007e1
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLTextAreaElement.webidl
@@ -0,0 +1,93 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-textarea-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+interface nsIEditor;
+interface XULControllers;
+
+[HTMLConstructor]
+interface HTMLTextAreaElement : HTMLElement {
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString autocomplete;
+  [CEReactions, SetterThrows, Pure]
+           attribute boolean autofocus;
+  [CEReactions, SetterThrows, Pure]
+           attribute unsigned long cols;
+           // attribute DOMString dirName;
+  [CEReactions, SetterThrows, Pure]
+           attribute boolean disabled;
+  [Pure]
+  readonly attribute HTMLFormElement? form;
+           // attribute DOMString inputMode;
+  [CEReactions, SetterThrows, Pure]
+           attribute long maxLength;
+  [CEReactions, SetterThrows, Pure]
+           attribute long minLength;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString name;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString placeholder;
+  [CEReactions, SetterThrows, Pure]
+           attribute boolean readOnly;
+  [CEReactions, SetterThrows, Pure]
+           attribute boolean required;
+  [CEReactions, SetterThrows, Pure]
+           attribute unsigned long rows;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString wrap;
+
+  [Constant]
+  readonly attribute DOMString type;
+  [CEReactions, Throws, Pure]
+           attribute DOMString defaultValue;
+  [CEReactions, SetterThrows, TreatNullAs=EmptyString] attribute DOMString value;
+  readonly attribute unsigned long textLength;
+
+  readonly attribute boolean willValidate;
+  readonly attribute ValidityState validity;
+  [Throws]
+  readonly attribute DOMString validationMessage;
+  boolean checkValidity();
+  boolean reportValidity();
+  void setCustomValidity(DOMString error);
+
+  readonly attribute NodeList labels;
+
+  void select();
+  [Throws]
+           attribute unsigned long? selectionStart;
+  [Throws]
+           attribute unsigned long? selectionEnd;
+  [Throws]
+           attribute DOMString? selectionDirection;
+  [Throws]
+  void setRangeText(DOMString replacement);
+  [Throws]
+  void setRangeText(DOMString replacement, unsigned long start,
+    unsigned long end, optional SelectionMode selectionMode = "preserve");
+  [Throws]
+  void setSelectionRange(unsigned long start, unsigned long end, optional DOMString direction);
+};
+
+partial interface HTMLTextAreaElement {
+  // Chrome-only Mozilla extensions
+
+  [Throws, ChromeOnly]
+  readonly attribute XULControllers controllers;
+};
+
+HTMLTextAreaElement implements MozEditableElement;
+
+partial interface HTMLTextAreaElement {
+  [ChromeOnly]
+  attribute DOMString previewValue;
+};
diff --git a/crates/web-sys/webidls/available/HTMLTimeElement.webidl b/crates/web-sys/webidls/available/HTMLTimeElement.webidl
new file mode 100644
index 00000000..35c06fef
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLTimeElement.webidl
@@ -0,0 +1,14 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/multipage/text-level-semantics.html#the-time-element
+ */
+
+[HTMLConstructor]
+interface HTMLTimeElement : HTMLElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString dateTime;
+};
diff --git a/crates/web-sys/webidls/available/HTMLTitleElement.webidl b/crates/web-sys/webidls/available/HTMLTitleElement.webidl
new file mode 100644
index 00000000..bbce70bb
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLTitleElement.webidl
@@ -0,0 +1,14 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-title-element
+ */
+
+[HTMLConstructor]
+interface HTMLTitleElement : HTMLElement {
+           [CEReactions, Throws]
+           attribute DOMString text;
+};
diff --git a/crates/web-sys/webidls/available/HTMLTrackElement.webidl b/crates/web-sys/webidls/available/HTMLTrackElement.webidl
new file mode 100644
index 00000000..cbb70db2
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLTrackElement.webidl
@@ -0,0 +1,30 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-track-element
+ */
+
+[HTMLConstructor]
+interface HTMLTrackElement : HTMLElement {
+  [CEReactions, SetterThrows, Pure]
+  attribute DOMString kind;
+  [CEReactions, SetterThrows, Pure]
+  attribute DOMString src;
+  [CEReactions, SetterThrows, Pure]
+  attribute DOMString srclang;
+  [CEReactions, SetterThrows, Pure]
+  attribute DOMString label;
+  [CEReactions, SetterThrows, Pure]
+  attribute boolean default;
+
+  const unsigned short NONE = 0;
+  const unsigned short LOADING = 1;
+  const unsigned short LOADED = 2;
+  const unsigned short ERROR = 3;
+  readonly attribute unsigned short readyState;
+
+  readonly attribute TextTrack? track;
+};
diff --git a/crates/web-sys/webidls/available/HTMLUListElement.webidl b/crates/web-sys/webidls/available/HTMLUListElement.webidl
new file mode 100644
index 00000000..72543749
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLUListElement.webidl
@@ -0,0 +1,26 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-ul-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-ul-element
+[HTMLConstructor]
+interface HTMLUListElement : HTMLElement {
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLUListElement {
+           [CEReactions, SetterThrows]
+           attribute boolean compact;
+           [CEReactions, SetterThrows]
+           attribute DOMString type;
+};
diff --git a/crates/web-sys/webidls/available/HTMLVideoElement.webidl b/crates/web-sys/webidls/available/HTMLVideoElement.webidl
new file mode 100644
index 00000000..53c612f5
--- /dev/null
+++ b/crates/web-sys/webidls/available/HTMLVideoElement.webidl
@@ -0,0 +1,62 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-video-element
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[HTMLConstructor]
+interface HTMLVideoElement : HTMLMediaElement {
+  [CEReactions, SetterThrows]
+           attribute unsigned long width;
+  [CEReactions, SetterThrows]
+           attribute unsigned long height;
+  readonly attribute unsigned long videoWidth;
+  readonly attribute unsigned long videoHeight;
+  [CEReactions, SetterThrows]
+           attribute DOMString poster;
+};
+
+partial interface HTMLVideoElement {
+  // A count of the number of video frames that have demuxed from the media
+  // resource. If we were playing perfectly, we'd be able to paint this many
+  // frames.
+  readonly attribute unsigned long mozParsedFrames;
+
+  // A count of the number of frames that have been decoded. We may drop
+  // frames if the decode is taking too much time.
+  readonly attribute unsigned long mozDecodedFrames;
+
+  // A count of the number of frames that have been presented to the rendering
+  // pipeline. We may drop frames if they arrive late at the renderer.
+  readonly attribute unsigned long mozPresentedFrames;
+
+  // Number of presented frames which were painted on screen.
+  readonly attribute unsigned long mozPaintedFrames;
+
+  // Time which the last painted video frame was late by, in seconds.
+  readonly attribute double mozFrameDelay;
+
+  // True if the video has an audio track available.
+  readonly attribute boolean mozHasAudio;
+
+  // Attributes for builtin video controls to lock screen orientation.
+  // True if video controls should lock orientation when fullscreen.
+  [Pref="media.videocontrols.lock-video-orientation", Func="IsChromeOrXBL"]
+    readonly attribute boolean mozOrientationLockEnabled;
+  // True if screen orientation is locked by video controls.
+  [Pref="media.videocontrols.lock-video-orientation", Func="IsChromeOrXBL"]
+    attribute boolean mozIsOrientationLocked;
+};
+
+// https://dvcs.w3.org/hg/html-media/raw-file/default/media-source/media-source.html#idl-def-HTMLVideoElement
+partial interface HTMLVideoElement {
+  [Func="mozilla::dom::MediaSource::Enabled", NewObject]
+  VideoPlaybackQuality getVideoPlaybackQuality();
+};
diff --git a/crates/web-sys/webidls/available/HashChangeEvent.webidl b/crates/web-sys/webidls/available/HashChangeEvent.webidl
new file mode 100644
index 00000000..6e8be455
--- /dev/null
+++ b/crates/web-sys/webidls/available/HashChangeEvent.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Constructor(DOMString type, optional HashChangeEventInit eventInitDict), LegacyEventInit]
+interface HashChangeEvent : Event
+{
+  readonly attribute DOMString oldURL;
+  readonly attribute DOMString newURL;
+
+  void initHashChangeEvent(DOMString typeArg,
+                           optional boolean canBubbleArg = false,
+                           optional boolean cancelableArg = false,
+                           optional DOMString oldURLArg = "",
+                           optional DOMString newURLArg = "");
+};
+
+dictionary HashChangeEventInit : EventInit
+{
+  DOMString oldURL = "";
+  DOMString newURL = "";
+};
diff --git a/crates/web-sys/webidls/available/Headers.webidl b/crates/web-sys/webidls/available/Headers.webidl
new file mode 100644
index 00000000..eef552a7
--- /dev/null
+++ b/crates/web-sys/webidls/available/Headers.webidl
@@ -0,0 +1,34 @@
+/* -*- Mode: IDL; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://fetch.spec.whatwg.org/#headers-class
+ */
+
+typedef (Headers or sequence<sequence<ByteString>> or record<ByteString, ByteString>) HeadersInit;
+
+enum HeadersGuardEnum {
+  "none",
+  "request",
+  "request-no-cors",
+  "response",
+  "immutable"
+};
+
+[Constructor(optional HeadersInit init),
+ Exposed=(Window,Worker)]
+interface Headers {
+  [Throws] void append(ByteString name, ByteString value);
+  [Throws] void delete(ByteString name);
+  [Throws] ByteString? get(ByteString name);
+  [Throws] boolean has(ByteString name);
+  [Throws] void set(ByteString name, ByteString value);
+  iterable<ByteString, ByteString>;
+
+  // Used to test different guard states from mochitest.
+  // Note: Must be set prior to populating headers or will throw.
+  [ChromeOnly, SetterThrows] attribute HeadersGuardEnum guard;
+};
diff --git a/crates/web-sys/webidls/available/HiddenPluginEvent.webidl b/crates/web-sys/webidls/available/HiddenPluginEvent.webidl
new file mode 100644
index 00000000..1ba09acb
--- /dev/null
+++ b/crates/web-sys/webidls/available/HiddenPluginEvent.webidl
@@ -0,0 +1,12 @@
+interface PluginTag;
+
+[Constructor(DOMString type, optional HiddenPluginEventInit eventInit), ChromeOnly]
+interface HiddenPluginEvent : Event
+{
+  readonly attribute PluginTag? tag;
+};
+
+dictionary HiddenPluginEventInit : EventInit
+{
+  PluginTag? tag = null;
+};
diff --git a/crates/web-sys/webidls/available/History.webidl b/crates/web-sys/webidls/available/History.webidl
new file mode 100644
index 00000000..fef86801
--- /dev/null
+++ b/crates/web-sys/webidls/available/History.webidl
@@ -0,0 +1,33 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-history-interface
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+enum ScrollRestoration { "auto", "manual" };
+
+interface History {
+  [Throws]
+  readonly attribute unsigned long length;
+  [Throws]
+  attribute ScrollRestoration scrollRestoration;
+  [Throws]
+  readonly attribute any state;
+  [Throws]
+  void go(optional long delta = 0);
+  [Throws]
+  void back();
+  [Throws]
+  void forward();
+  [Throws]
+  void pushState(any data, DOMString title, optional DOMString? url = null);
+  [Throws]
+  void replaceState(any data, DOMString title, optional DOMString? url = null);
+};
diff --git a/crates/web-sys/webidls/available/IDBCursor.webidl b/crates/web-sys/webidls/available/IDBCursor.webidl
new file mode 100644
index 00000000..159f9ba8
--- /dev/null
+++ b/crates/web-sys/webidls/available/IDBCursor.webidl
@@ -0,0 +1,49 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/IndexedDB/raw-file/tip/Overview.html#idl-def-IDBCursorDirection
+ */
+
+enum IDBCursorDirection {
+    "next",
+    "nextunique",
+    "prev",
+    "prevunique"
+};
+
+[Exposed=(Window,Worker,System)]
+interface IDBCursor {
+    readonly    attribute (IDBObjectStore or IDBIndex) source;
+
+    readonly    attribute IDBCursorDirection           direction;
+
+    [Throws]
+    readonly    attribute any                          key;
+
+    [Throws]
+    readonly    attribute any                          primaryKey;
+
+    [Throws]
+    IDBRequest update (any value);
+
+    [Throws]
+    void       advance ([EnforceRange] unsigned long count);
+
+    [Throws]
+    void       continue (optional any key);
+
+    [Throws]
+    void       continuePrimaryKey(any key, any primaryKey);
+
+    [Throws]
+    IDBRequest delete ();
+};
+
+[Exposed=(Window,Worker,System)]
+interface IDBCursorWithValue : IDBCursor {
+    [Throws]
+    readonly    attribute any value;
+};
diff --git a/crates/web-sys/webidls/available/IDBDatabase.webidl b/crates/web-sys/webidls/available/IDBDatabase.webidl
new file mode 100644
index 00000000..19ecaa41
--- /dev/null
+++ b/crates/web-sys/webidls/available/IDBDatabase.webidl
@@ -0,0 +1,48 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/IndexedDB/raw-file/tip/Overview.html#idl-def-IDBObjectStoreParameters
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=(Window,Worker,System)]
+interface IDBDatabase : EventTarget {
+    readonly    attribute DOMString          name;
+    readonly    attribute unsigned long long version;
+
+    readonly    attribute DOMStringList      objectStoreNames;
+
+    [Throws]
+    IDBObjectStore createObjectStore (DOMString name, optional IDBObjectStoreParameters optionalParameters);
+
+    [Throws]
+    void           deleteObjectStore (DOMString name);
+
+    [Throws]
+    IDBTransaction transaction ((DOMString or sequence<DOMString>) storeNames,
+                                optional IDBTransactionMode mode = "readonly");
+
+    void           close ();
+
+                attribute EventHandler       onabort;
+                attribute EventHandler       onclose;
+                attribute EventHandler       onerror;
+                attribute EventHandler       onversionchange;
+};
+
+partial interface IDBDatabase {
+    [Func="mozilla::dom::IndexedDatabaseManager::ExperimentalFeaturesEnabled"]
+    readonly    attribute StorageType        storage;
+
+    [Exposed=Window, Throws, UseCounter]
+    IDBRequest createMutableFile (DOMString name, optional DOMString type);
+
+    // this is deprecated due to renaming in the spec
+    [Exposed=Window, Throws, UseCounter]
+    IDBRequest mozCreateFileHandle (DOMString name, optional DOMString type); // now createMutableFile
+};
diff --git a/crates/web-sys/webidls/available/IDBFactory.webidl b/crates/web-sys/webidls/available/IDBFactory.webidl
new file mode 100644
index 00000000..0599af5e
--- /dev/null
+++ b/crates/web-sys/webidls/available/IDBFactory.webidl
@@ -0,0 +1,65 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/IndexedDB/raw-file/tip/Overview.html#idl-def-IDBFactory
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface Principal;
+
+dictionary IDBOpenDBOptions
+{
+  [EnforceRange] unsigned long long version;
+  StorageType storage;
+};
+
+/**
+ * Interface that defines the indexedDB property on a window.  See
+ * http://dvcs.w3.org/hg/IndexedDB/raw-file/tip/Overview.html#idl-def-IDBFactory
+ * for more information.
+ */
+[Exposed=(Window,Worker,System)]
+interface IDBFactory {
+  [Throws, NeedsCallerType]
+  IDBOpenDBRequest
+  open(DOMString name,
+       [EnforceRange] unsigned long long version);
+
+  [Throws, NeedsCallerType]
+  IDBOpenDBRequest
+  open(DOMString name,
+       optional IDBOpenDBOptions options);
+
+  [Throws, NeedsCallerType]
+  IDBOpenDBRequest
+  deleteDatabase(DOMString name,
+                 optional IDBOpenDBOptions options);
+
+  [Throws]
+  short
+  cmp(any first,
+      any second);
+
+  [Throws, ChromeOnly, NeedsCallerType]
+  IDBOpenDBRequest
+  openForPrincipal(Principal principal,
+                   DOMString name,
+                   [EnforceRange] unsigned long long version);
+
+  [Throws, ChromeOnly, NeedsCallerType]
+  IDBOpenDBRequest
+  openForPrincipal(Principal principal,
+                   DOMString name,
+                   optional IDBOpenDBOptions options);
+
+  [Throws, ChromeOnly, NeedsCallerType]
+  IDBOpenDBRequest
+  deleteForPrincipal(Principal principal,
+                     DOMString name,
+                     optional IDBOpenDBOptions options);
+};
diff --git a/crates/web-sys/webidls/available/IDBFileHandle.webidl b/crates/web-sys/webidls/available/IDBFileHandle.webidl
new file mode 100644
index 00000000..e312742c
--- /dev/null
+++ b/crates/web-sys/webidls/available/IDBFileHandle.webidl
@@ -0,0 +1,43 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtaone at http://mozilla.org/MPL/2.0/. */
+
+dictionary IDBFileMetadataParameters
+{
+  boolean size = true;
+  boolean lastModified = true;
+};
+
+[Exposed=(Window,System)]
+interface IDBFileHandle : EventTarget
+{
+  readonly attribute IDBMutableFile? mutableFile;
+  // this is deprecated due to renaming in the spec
+  readonly attribute IDBMutableFile? fileHandle; // now mutableFile
+  readonly attribute FileMode mode;
+  readonly attribute boolean active;
+  attribute unsigned long long? location;
+
+  [Throws]
+  IDBFileRequest? getMetadata(optional IDBFileMetadataParameters parameters);
+  [Throws]
+  IDBFileRequest? readAsArrayBuffer(unsigned long long size);
+  [Throws]
+  IDBFileRequest? readAsText(unsigned long long size,
+                             optional DOMString? encoding = null);
+
+  [Throws]
+  IDBFileRequest? write((DOMString or ArrayBuffer or ArrayBufferView or Blob) value);
+  [Throws]
+  IDBFileRequest? append((DOMString or ArrayBuffer or ArrayBufferView or Blob) value);
+  [Throws]
+  IDBFileRequest? truncate(optional unsigned long long size);
+  [Throws]
+  IDBFileRequest? flush();
+  [Throws]
+  void abort();
+
+  attribute EventHandler oncomplete;
+  attribute EventHandler onabort;
+  attribute EventHandler onerror;
+};
diff --git a/crates/web-sys/webidls/available/IDBFileRequest.webidl b/crates/web-sys/webidls/available/IDBFileRequest.webidl
new file mode 100644
index 00000000..fc3a8c5b
--- /dev/null
+++ b/crates/web-sys/webidls/available/IDBFileRequest.webidl
@@ -0,0 +1,14 @@
+/* -*- Mode: IDL; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+[Exposed=(Window,System)]
+interface IDBFileRequest : DOMRequest {
+  readonly attribute IDBFileHandle? fileHandle;
+  // this is deprecated due to renaming in the spec
+  readonly attribute IDBFileHandle? lockedFile; // now fileHandle
+
+  attribute EventHandler onprogress;
+};
diff --git a/crates/web-sys/webidls/available/IDBIndex.webidl b/crates/web-sys/webidls/available/IDBIndex.webidl
new file mode 100644
index 00000000..0e436650
--- /dev/null
+++ b/crates/web-sys/webidls/available/IDBIndex.webidl
@@ -0,0 +1,71 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/IndexedDB/raw-file/tip/Overview.html#idl-def-IDBIndexParameters
+ */
+
+dictionary IDBIndexParameters {
+    boolean unique = false;
+    boolean multiEntry = false;
+    // <null>:   Not locale-aware, uses normal JS sorting.
+    // <string>: Always sorted based on the rules of the specified
+    //           locale (e.g. "en-US", etc.).
+    // "auto":   Sorted by the platform default, may change based on
+    //           user agent options.
+    DOMString? locale = null;
+};
+
+[Exposed=(Window,Worker,System)]
+interface IDBIndex {
+    [SetterThrows]
+    attribute DOMString name;
+
+    readonly    attribute IDBObjectStore objectStore;
+
+    [Throws]
+    readonly    attribute any            keyPath;
+
+    readonly    attribute boolean        multiEntry;
+    readonly    attribute boolean        unique;
+
+    // <null>:   Not locale-aware, uses normal JS sorting.
+    // <string>: Sorted based on the rules of the specified locale.
+    //           Note: never returns "auto", only the current locale.
+    [Func="mozilla::dom::IndexedDatabaseManager::ExperimentalFeaturesEnabled"]
+    readonly attribute DOMString? locale;
+
+    [Func="mozilla::dom::IndexedDatabaseManager::ExperimentalFeaturesEnabled"]
+    readonly attribute boolean isAutoLocale;
+
+    [Throws]
+    IDBRequest openCursor (optional any range, optional IDBCursorDirection direction = "next");
+
+    [Throws]
+    IDBRequest openKeyCursor (optional any range, optional IDBCursorDirection direction = "next");
+
+    [Throws]
+    IDBRequest get (any key);
+
+    [Throws]
+    IDBRequest getKey (any key);
+
+    [Throws]
+    IDBRequest count (optional any key);
+};
+
+partial interface IDBIndex {
+    [Throws]
+    IDBRequest mozGetAll (optional any key, [EnforceRange] optional unsigned long limit);
+
+    [Throws]
+    IDBRequest mozGetAllKeys (optional any key, [EnforceRange] optional unsigned long limit);
+
+    [Throws]
+    IDBRequest getAll (optional any key, [EnforceRange] optional unsigned long limit);
+
+    [Throws]
+    IDBRequest getAllKeys (optional any key, [EnforceRange] optional unsigned long limit);
+};
diff --git a/crates/web-sys/webidls/available/IDBKeyRange.webidl b/crates/web-sys/webidls/available/IDBKeyRange.webidl
new file mode 100644
index 00000000..1caba761
--- /dev/null
+++ b/crates/web-sys/webidls/available/IDBKeyRange.webidl
@@ -0,0 +1,41 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+/*
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/IndexedDB/raw-file/tip/Overview.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=(Window,Worker,System)]
+interface IDBKeyRange {
+  [Throws]
+  readonly attribute any     lower;
+  [Throws]
+  readonly attribute any     upper;
+  [Constant]
+  readonly attribute boolean lowerOpen;
+  [Constant]
+  readonly attribute boolean upperOpen;
+  [Throws]
+  boolean includes(any key);
+
+
+  [NewObject, Throws]
+  static IDBKeyRange only (any value);
+  [NewObject, Throws]
+  static IDBKeyRange lowerBound (any lower, optional boolean open = false);
+  [NewObject, Throws]
+  static IDBKeyRange upperBound (any upper, optional boolean open = false);
+  [NewObject, Throws]
+  static IDBKeyRange bound (any lower, any upper, optional boolean lowerOpen = false, optional boolean upperOpen = false);
+};
+
+[Exposed=(Window,Worker,System),
+ Func="mozilla::dom::IndexedDatabaseManager::ExperimentalFeaturesEnabled"]
+interface IDBLocaleAwareKeyRange : IDBKeyRange {
+  [NewObject, Throws]
+  static IDBLocaleAwareKeyRange bound (any lower, any upper, optional boolean lowerOpen = false, optional boolean upperOpen = false);
+};
diff --git a/crates/web-sys/webidls/available/IDBMutableFile.webidl b/crates/web-sys/webidls/available/IDBMutableFile.webidl
new file mode 100644
index 00000000..4883cb22
--- /dev/null
+++ b/crates/web-sys/webidls/available/IDBMutableFile.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+[Exposed=(Window,System)]
+interface IDBMutableFile : EventTarget {
+  readonly attribute DOMString name;
+  readonly attribute DOMString type;
+
+  readonly attribute IDBDatabase database;
+
+  [Throws, UseCounter]
+  IDBFileHandle open(optional FileMode mode = "readonly");
+
+  [Throws, UseCounter]
+  DOMRequest getFile();
+
+  attribute EventHandler onabort;
+  attribute EventHandler onerror;
+};
diff --git a/crates/web-sys/webidls/available/IDBObjectStore.webidl b/crates/web-sys/webidls/available/IDBObjectStore.webidl
new file mode 100644
index 00000000..a06ac889
--- /dev/null
+++ b/crates/web-sys/webidls/available/IDBObjectStore.webidl
@@ -0,0 +1,74 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/IndexedDB/raw-file/tip/Overview.html#idl-def-IDBObjectStore
+ */
+
+dictionary IDBObjectStoreParameters {
+    (DOMString or sequence<DOMString>)? keyPath = null;
+    boolean                             autoIncrement = false;
+};
+
+[Exposed=(Window,Worker,System)]
+interface IDBObjectStore {
+    [SetterThrows]
+    attribute DOMString name;
+
+    [Throws]
+    readonly    attribute any            keyPath;
+
+    readonly    attribute DOMStringList  indexNames;
+    readonly    attribute IDBTransaction transaction;
+    readonly    attribute boolean        autoIncrement;
+
+    [Throws]
+    IDBRequest put (any value, optional any key);
+
+    [Throws]
+    IDBRequest add (any value, optional any key);
+
+    [Throws]
+    IDBRequest delete (any key);
+
+    [Throws]
+    IDBRequest get (any key);
+
+    [Throws]
+    IDBRequest getKey (any key);
+
+    [Throws]
+    IDBRequest clear ();
+
+    [Throws]
+    IDBRequest openCursor (optional any range, optional IDBCursorDirection direction = "next");
+
+    [Throws]
+    IDBIndex   createIndex (DOMString name, (DOMString or sequence<DOMString>) keyPath, optional IDBIndexParameters optionalParameters);
+
+    [Throws]
+    IDBIndex   index (DOMString name);
+
+    [Throws]
+    void       deleteIndex (DOMString indexName);
+
+    [Throws]
+    IDBRequest count (optional any key);
+};
+
+partial interface IDBObjectStore {
+    // Success fires IDBTransactionEvent, result == array of values for given keys
+    [Throws]
+    IDBRequest mozGetAll (optional any key, [EnforceRange] optional unsigned long limit);
+
+    [Throws]
+    IDBRequest getAll (optional any key, [EnforceRange] optional unsigned long limit);
+
+    [Throws]
+    IDBRequest getAllKeys (optional any key, [EnforceRange] optional unsigned long limit);
+
+    [Throws]
+    IDBRequest openKeyCursor (optional any range, optional IDBCursorDirection direction = "next");
+};
diff --git a/crates/web-sys/webidls/available/IDBOpenDBRequest.webidl b/crates/web-sys/webidls/available/IDBOpenDBRequest.webidl
new file mode 100644
index 00000000..ba0ebf83
--- /dev/null
+++ b/crates/web-sys/webidls/available/IDBOpenDBRequest.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/IndexedDB/raw-file/tip/Overview.html#idl-def-IDBOpenDBRequest
+ */
+
+[Exposed=(Window,Worker,System)]
+interface IDBOpenDBRequest : IDBRequest {
+                attribute EventHandler onblocked;
+
+                attribute EventHandler onupgradeneeded;
+};
diff --git a/crates/web-sys/webidls/available/IDBRequest.webidl b/crates/web-sys/webidls/available/IDBRequest.webidl
new file mode 100644
index 00000000..c23bf9fe
--- /dev/null
+++ b/crates/web-sys/webidls/available/IDBRequest.webidl
@@ -0,0 +1,31 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/IndexedDB/raw-file/tip/Overview.html#idl-def-IDBRequest
+ * https://dvcs.w3.org/hg/IndexedDB/raw-file/tip/Overview.html#idl-def-IDBRequestReadyState
+ */
+
+enum IDBRequestReadyState {
+    "pending",
+    "done"
+};
+
+[Exposed=(Window,Worker,System)]
+interface IDBRequest : EventTarget {
+    [Throws]
+    readonly    attribute any                  result;
+
+    [Throws]
+    readonly    attribute DOMException?        error;
+
+    readonly    attribute (IDBObjectStore or IDBIndex or IDBCursor)? source;
+    readonly    attribute IDBTransaction?      transaction;
+    readonly    attribute IDBRequestReadyState readyState;
+
+                attribute EventHandler         onsuccess;
+
+                attribute EventHandler         onerror;
+};
diff --git a/crates/web-sys/webidls/available/IDBTransaction.webidl b/crates/web-sys/webidls/available/IDBTransaction.webidl
new file mode 100644
index 00000000..336eaf2b
--- /dev/null
+++ b/crates/web-sys/webidls/available/IDBTransaction.webidl
@@ -0,0 +1,44 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/IndexedDB/raw-file/tip/Overview.html#idl-def-IDBTransaction
+ * https://dvcs.w3.org/hg/IndexedDB/raw-file/tip/Overview.html#idl-def-IDBTransactionMode
+ */
+
+enum IDBTransactionMode {
+    "readonly",
+    "readwrite",
+    // The "readwriteflush" mode is only available when the
+    // |IndexedDatabaseManager::ExperimentalFeaturesEnabled()| function returns
+    // true. This mode is not yet part of the standard.
+    "readwriteflush",
+    "cleanup",
+    "versionchange"
+};
+
+[Exposed=(Window,Worker,System)]
+interface IDBTransaction : EventTarget {
+    [Throws]
+    readonly    attribute IDBTransactionMode mode;
+    readonly    attribute IDBDatabase        db;
+
+    readonly    attribute DOMException?      error;
+
+    [Throws]
+    IDBObjectStore objectStore (DOMString name);
+
+    [Throws]
+    void           abort();
+
+                attribute EventHandler       onabort;
+                attribute EventHandler       oncomplete;
+                attribute EventHandler       onerror;
+};
+
+// This seems to be custom
+partial interface IDBTransaction {
+    readonly    attribute DOMStringList objectStoreNames;
+};
diff --git a/crates/web-sys/webidls/available/IDBVersionChangeEvent.webidl b/crates/web-sys/webidls/available/IDBVersionChangeEvent.webidl
new file mode 100644
index 00000000..1c938500
--- /dev/null
+++ b/crates/web-sys/webidls/available/IDBVersionChangeEvent.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/IndexedDB/raw-file/tip/Overview.html#idl-def-IDBVersionChangeEvent
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary IDBVersionChangeEventInit : EventInit {
+    unsigned long long  oldVersion = 0;
+    unsigned long long? newVersion = null;
+};
+
+[Constructor(DOMString type, optional IDBVersionChangeEventInit eventInitDict),
+ Exposed=(Window,Worker,System)]
+interface IDBVersionChangeEvent : Event {
+    readonly    attribute unsigned long long  oldVersion;
+    readonly    attribute unsigned long long? newVersion;
+};
+
diff --git a/crates/web-sys/webidls/available/IIRFilterNode.webidl b/crates/web-sys/webidls/available/IIRFilterNode.webidl
new file mode 100644
index 00000000..8a005794
--- /dev/null
+++ b/crates/web-sys/webidls/available/IIRFilterNode.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is https://www.w3.org/TR/webaudio
+ *
+ * Copyright © 2016 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary IIRFilterOptions : AudioNodeOptions {
+    required sequence<double> feedforward;
+    required sequence<double> feedback;
+};
+
+[Pref="dom.webaudio.enabled",
+Constructor(BaseAudioContext context, IIRFilterOptions options)]
+interface IIRFilterNode : AudioNode {
+    void getFrequencyResponse(Float32Array frequencyHz, Float32Array magResponse, Float32Array phaseResponse);
+};
+
+// Mozilla extension
+IIRFilterNode implements AudioNodePassThrough;
diff --git a/crates/web-sys/webidls/available/IdleDeadline.webidl b/crates/web-sys/webidls/available/IdleDeadline.webidl
new file mode 100644
index 00000000..903122ab
--- /dev/null
+++ b/crates/web-sys/webidls/available/IdleDeadline.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is:
+ * https://w3c.github.io/requestidlecallback/
+ */
+
+[Exposed=(Window,System),
+ Func="nsGlobalWindowInner::IsRequestIdleCallbackEnabled"]
+interface IdleDeadline {
+  DOMHighResTimeStamp timeRemaining();
+  readonly attribute boolean didTimeout;
+};
diff --git a/crates/web-sys/webidls/available/ImageBitmap.webidl b/crates/web-sys/webidls/available/ImageBitmap.webidl
new file mode 100644
index 00000000..40948a2e
--- /dev/null
+++ b/crates/web-sys/webidls/available/ImageBitmap.webidl
@@ -0,0 +1,412 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://html.spec.whatwg.org/multipage/webappapis.html#images
+ *
+ * The origin of the extended IDL file is
+ * http://w3c.github.io/mediacapture-worker/#imagebitmap-extensions
+ */
+
+// Extensions
+// Bug 1141979 - [FoxEye] Extend ImageBitmap with interfaces to access its
+// underlying image data
+//
+// Note:
+// Our overload resolution implementation doesn't deal with a union as the
+// distinguishing argument which means we cannot overload functions via union
+// types, a.k.a. we cannot overload createImageBitmap() via ImageBitmapSource
+// and BufferSource. Here, we work around this issue by adding the BufferSource
+// into ImageBitmapSource.
+
+typedef (HTMLImageElement or
+         HTMLVideoElement or
+         HTMLCanvasElement or
+         Blob or
+         ImageData or
+         CanvasRenderingContext2D or
+         ImageBitmap or
+         BufferSource) ImageBitmapSource;
+
+[Exposed=(Window,Worker)]
+interface ImageBitmap {
+  [Constant]
+  readonly attribute unsigned long width;
+  [Constant]
+  readonly attribute unsigned long height;
+};
+
+// It's crucial that there be a way to explicitly dispose of ImageBitmaps
+// since they refer to potentially large graphics resources. Some uses
+// of this API proposal will result in repeated allocations of ImageBitmaps,
+// and garbage collection will not reliably reclaim them quickly enough.
+// Here we reuse close(), which also exists on another Transferable type,
+// MessagePort. Potentially, all Transferable types should inherit from a
+// new interface type "Closeable".
+partial interface ImageBitmap {
+  // Dispose of all graphical resources associated with this ImageBitmap.
+  void close();
+};
+
+// ImageBitmap-extensions
+// Bug 1141979 - [FoxEye] Extend ImageBitmap with interfaces to access its
+// underlying image data
+
+/*
+ * An image or a video frame is conceptually a two-dimensional array of data and
+ * each element in the array is called a pixel. The pixels are usually stored in
+ * a one-dimensional array and could be arranged in a variety of image formats.
+ * Developers need to know how the pixels are formatted so that they are able to
+ * process them.
+ *
+ * The image format describes how pixels in an image are arranged. A single
+ * pixel has at least one, but usually multiple pixel values. The range of a
+ * pixel value varies, which means different image formats use different data
+ * types to store a single pixel value.
+ *
+ * The most frequently used data type is 8-bit unsigned integer whose range is
+ * from 0 to 255, others could be 16-bit integer or 32-bit floating points and
+ * so forth. The number of pixel values of a single pixel is called the number
+ * of channels of the image format. Multiple pixel values of a pixel are used
+ * together to describe the captured property which could be color or depth
+ * information. For example, if the data is a color image in RGB color space,
+ * then it is a three-channel image format and a pixel is described by R, G and
+ * B three pixel values with range from 0 to 255. As another example, if the
+ * data is a gray image, then it is a single-channel image format with 8-bit
+ * unsigned integer data type and the pixel value describes the gray scale. For
+ * depth data, it is a single channel image format too, but the data type is
+ * 16-bit unsigned integer and the pixel value is the depth level.
+ *
+ * For those image formats whose pixels contain multiple pixel values, the pixel
+ * values might be arranged in one of the following ways:
+ * 1) Planar pixel layout:
+ *    each channel has its pixel values stored consecutively in separated
+ *    buffers (a.k.a. planes) and then all channel buffers are stored
+ *    consecutively in memory.
+ *    (Ex: RRRRRR......GGGGGG......BBBBBB......)
+ * 2) Interleaving pixel layout:
+ *    each pixel has its pixel values from all channels stored together and
+ *    interleaves all channels.
+ *    (Ex: RGBRGBRGBRGBRGB......)
+ */
+
+
+/*
+ * The ImageBitmap extensions use this enumeration to negotiate the image format
+ * while 1) accessing the underlying data of an ImageBitmap and
+ *       2) creating a new ImageBitmap.
+ *
+ * For each format in this enumeration, we use a 2x2 small image (4 pixels) as
+ * example to illustrate the pixel layout.
+ *
+ * 2x2 image:   +--------+--------+
+ *              | pixel1 | pixel2 |
+ *              +--------+--------+
+ *              | pixel3 | pixel4 |
+ *              +--------+--------+
+ *
+ */
+enum ImageBitmapFormat {
+  /*
+   * Channel order: R, G, B, A
+   * Channel size: full rgba-chennels
+   * Pixel layout: interleaving rgba-channels
+   * Pixel layout illustration:
+   *   [Plane1]: R1 G1 B1 A1 R2 G2 B2 A2 R3 G3 B3 A3 R4 G4 B4 A4
+   * Data type: 8-bit unsigned integer
+   */
+  "RGBA32",
+
+  /*
+   * Channel order: B, G, R, A
+   * Channel size: full bgra-channels
+   * Pixel layout: interleaving bgra-channels
+   * Pixel layout illustration:
+   *   [Plane1]: B1 G1 R1 A1 B2 G2 R2 A2 B3 G3 R3 A3 B4 G4 R4 A4
+   * Data type: 8-bit unsigned integer
+   */
+  "BGRA32",
+
+  /*
+   * Channel order: R, G, B
+   * Channel size: full rgb-channels
+   * Pixel layout: interleaving rgb-channels
+   * Pixel layout illustration:
+   *   [Plane1]: R1 G1 B1 R2 G2 B2 R3 G3 B3 R4 G4 B4
+   * Data type: 8-bit unsigned integer
+   */
+  "RGB24",
+
+  /*
+   * Channel order: B, G, R
+   * Channel size: full bgr-channels
+   * Pixel layout: interleaving bgr-channels
+   * Pixel layout illustration:
+   *   [Plane1]: B1 G1 R1 B2 G2 R2 B3 G3 R3 B4 G4 R4
+   * Data type: 8-bit unsigned integer
+   */
+  "BGR24",
+
+  /*
+   * Channel order: GRAY
+   * Channel size: full gray-channel
+   * Pixel layout: planar gray-channel
+   * Pixel layout illustration:
+   *   [Plane1]: GRAY1 GRAY2 GRAY3 GRAY4
+   * Data type: 8-bit unsigned integer
+   */
+  "GRAY8",
+
+  /*
+   * Channel order: Y, U, V
+   * Channel size: full yuv-channels
+   * Pixel layout: planar yuv-channels
+   * Pixel layout illustration:
+   *   [Plane1]: Y1 Y2 Y3 Y4
+   *   [Plane2]: U1 U2 U3 U4
+   *   [Plane3]: V1 V2 V3 V4
+   * Data type: 8-bit unsigned integer
+   */
+  "YUV444P",
+
+  /*
+   * Channel order: Y, U, V
+   * Channel size: full y-channel, half uv-channels
+   * Pixel layout: planar yuv-channels
+   * Pixel layout illustration:
+   *   [Plane1]: Y1 Y2 Y3 Y4
+   *   [Plane2]: U1 U3
+   *   [Plane3]: V1 V3
+   * Data type: 8-bit unsigned integer
+   */
+  "YUV422P",
+
+  /*
+   * Channel order: Y, U, V
+   * Channel size: full y-channel, quarter uv-channels
+   * Pixel layout: planar yuv-channels
+   * Pixel layout illustration:
+   *   [Plane1]: Y1 Y2 Y3 Y4
+   *   [Plane2]: U1
+   *   [Plane3]: V1
+   * Data type: 8-bit unsigned integer
+   */
+  "YUV420P",
+
+  /*
+   * Channel order: Y, U, V
+   * Channel size: full y-channel, quarter uv-channels
+   * Pixel layout: planar y-channel, interleaving uv-channels
+   * Pixel layout illustration:
+   *   [Plane1]: Y1 Y2 Y3 Y4
+   *   [Plane2]: U1 V1
+   * Data type: 8-bit unsigned integer
+   */
+  "YUV420SP_NV12",
+
+  /*
+   * Channel order: Y, V, U
+   * Channel size: full y-channel, quarter vu-channels
+   * Pixel layout: planar y-channel, interleaving vu-channels
+   * Pixel layout illustration:
+   *   [Plane1]: Y1 Y2 Y3 Y4
+   *   [Plane2]: V1 U1
+   * Data type: 8-bit unsigned integer
+   */
+  "YUV420SP_NV21",
+
+  /*
+   * Channel order: H, S, V
+   * Channel size: full hsv-channels
+   * Pixel layout: interleaving hsv-channels
+   * Pixel layout illustration:
+   *   [Plane1]: H1 S1 V1 H2 S2 V2 H3 S3 V3
+   * Data type: 32-bit floating point value
+   */
+  "HSV",
+
+  /*
+   * Channel order: l, a, b
+   * Channel size: full lab-channels
+   * Pixel layout: interleaving lab-channels
+   * Pixel layout illustration:
+   *   [Plane1]: l1 a1 b1 l2 a2 b2 l3 a3 b3
+   * Data type: 32-bit floating point value
+   */
+  "Lab",
+
+  /*
+   * Channel order: DEPTH
+   * Channel size: full depth-channel
+   * Pixel layout: planar depth-channel
+   * Pixel layout illustration:
+   *   [Plane1]: DEPTH1 DEPTH2 DEPTH3 DEPTH4
+   * Data type: 16-bit unsigned integer
+   */
+  "DEPTH",
+};
+
+enum ChannelPixelLayoutDataType {
+  "uint8",
+  "int8",
+  "uint16",
+  "int16",
+  "uint32",
+  "int32",
+  "float32",
+  "float64"
+};
+
+/*
+ * Two concepts, ImagePixelLayout and ChannelPixelLayout, together generalize
+ * the variety of pixel layouts among image formats.
+ *
+ * The ChannelPixelLayout represents the pixel layout of a single channel in a
+ * certain image format and the ImagePixelLayout is just the collection of
+ * ChannelPixelLayouts. So, the ChannelPixelLayout is defined as a dictionary
+ * type with properties to describe the layout and the ImagePixelLayout is just
+ * an alias name to a sequence of ChannelPixelLayout objects.
+ *
+ * Since an image format is composed of at least one channel, an
+ * ImagePixelLayout object contains at least one ChannelPixelLayout object.
+ *
+ * Although an image or a video frame is a two-dimensional structure, its data
+ * is usually stored in a one-dimensional array in the row-major way and the
+ * ChannelPixelLayout objects use the following properties to describe the
+ * layout of pixel values in the buffer.
+ *
+ * 1) offset:
+ *    denotes the beginning position of the channel's data relative to the
+ *    beginning position of the one-dimensional array.
+ * 2) width & height:
+ *    denote the width and height of the channel respectively. Each channel in
+ *    an image format may have different height and width.
+ * 3) data type:
+ *    denotes the format used to store one single pixel value.
+ * 4) stride:
+ *    the number of bytes between the beginning two consecutive rows in memory.
+ *    (The total bytes of each row plus the padding bytes of each raw.)
+ * 5) skip value:
+ *    the value is zero for the planar pixel layout, and a positive integer for
+ *    the interleaving pixel layout. (Describes how many bytes there are between
+ *    two adjacent pixel values in this channel.)
+ */
+
+/*
+ * Example1: RGBA image, width = 620, height = 480, stride = 2560
+ *
+ * chanel_r: offset = 0, width = 620, height = 480, data type = uint8, stride = 2560, skip = 3
+ * chanel_g: offset = 1, width = 620, height = 480, data type = uint8, stride = 2560, skip = 3
+ * chanel_b: offset = 2, width = 620, height = 480, data type = uint8, stride = 2560, skip = 3
+ * chanel_a: offset = 3, width = 620, height = 480, data type = uint8, stride = 2560, skip = 3
+ *
+ *         <---------------------------- stride ---------------------------->
+ *         <---------------------- width x 4 ---------------------->
+ * [index] 01234   8   12  16  20  24  28                           2479    2559
+ *         |||||---|---|---|---|---|---|----------------------------|-------|
+ * [data]  RGBARGBARGBARGBARGBAR___R___R...                         A%%%%%%%%
+ * [data]  RGBARGBARGBARGBARGBAR___R___R...                         A%%%%%%%%
+ * [data]  RGBARGBARGBARGBARGBAR___R___R...                         A%%%%%%%%
+ *              ^^^
+ *              r-skip
+ */
+
+/*
+ * Example2: YUV420P image, width = 620, height = 480, stride = 640
+ *
+ * chanel_y: offset = 0, width = 620, height = 480, stride = 640, skip = 0
+ * chanel_u: offset = 307200, width = 310, height = 240, data type = uint8, stride = 320, skip = 0
+ * chanel_v: offset = 384000, width = 310, height = 240, data type = uint8, stride = 320, skip = 0
+ *
+ *         <--------------------------- y-stride --------------------------->
+ *         <----------------------- y-width ----------------------->
+ * [index] 012345                                                  619      639
+ *         ||||||--------------------------------------------------|--------|
+ * [data]  YYYYYYYYYYYYYYYYYYYYYYYYYYYYY...                        Y%%%%%%%%%
+ * [data]  YYYYYYYYYYYYYYYYYYYYYYYYYYYYY...                        Y%%%%%%%%%
+ * [data]  YYYYYYYYYYYYYYYYYYYYYYYYYYYYY...                        Y%%%%%%%%%
+ * [data]  ......
+ *         <-------- u-stride ---------->
+ *         <----- u-width ----->
+ * [index] 307200              307509   307519
+ *         |-------------------|--------|
+ * [data]  UUUUUUUUUU...       U%%%%%%%%%
+ * [data]  UUUUUUUUUU...       U%%%%%%%%%
+ * [data]  UUUUUUUUUU...       U%%%%%%%%%
+ * [data]  ......
+ *         <-------- v-stride ---------->
+ *         <- --- v-width ----->
+ * [index] 384000              384309   384319
+ *         |-------------------|--------|
+ * [data]  VVVVVVVVVV...       V%%%%%%%%%
+ * [data]  VVVVVVVVVV...       V%%%%%%%%%
+ * [data]  VVVVVVVVVV...       V%%%%%%%%%
+ * [data]  ......
+ */
+
+/*
+ * Example3: YUV420SP_NV12 image, width = 620, height = 480, stride = 640
+ *
+ * chanel_y: offset = 0, width = 620, height = 480, stride = 640, skip = 0
+ * chanel_u: offset = 307200, width = 310, height = 240, data type = uint8, stride = 640, skip = 1
+ * chanel_v: offset = 307201, width = 310, height = 240, data type = uint8, stride = 640, skip = 1
+ *
+ *         <--------------------------- y-stride -------------------------->
+ *         <----------------------- y-width ---------------------->
+ * [index] 012345                                                 619      639
+ *         ||||||-------------------------------------------------|--------|
+ * [data]  YYYYYYYYYYYYYYYYYYYYYYYYYYYYY...                       Y%%%%%%%%%
+ * [data]  YYYYYYYYYYYYYYYYYYYYYYYYYYYYY...                       Y%%%%%%%%%
+ * [data]  YYYYYYYYYYYYYYYYYYYYYYYYYYYYY...                       Y%%%%%%%%%
+ * [data]  ......
+ *         <--------------------- u-stride / v-stride -------------------->
+ *         <------------------ u-width + v-width ----------------->
+ * [index] 307200(u-offset)                                       307819  307839
+ *         |------------------------------------------------------|-------|
+ * [index] |307201(v-offset)                                      |307820 |
+ *         ||-----------------------------------------------------||------|
+ * [data]  UVUVUVUVUVUVUVUVUVUVUVUVUVUVUV...                      UV%%%%%%%
+ * [data]  UVUVUVUVUVUVUVUVUVUVUVUVUVUVUV...                      UV%%%%%%%
+ * [data]  UVUVUVUVUVUVUVUVUVUVUVUVUVUVUV...                      UV%%%%%%%
+ *          ^            ^
+ *         u-skip        v-skip
+ */
+
+/*
+ * Example4: DEPTH image, width = 640, height = 480, stride = 1280
+ *
+ * chanel_d: offset = 0, width = 640, height = 480, data type = uint16, stride = 1280, skip = 0
+ *
+ * note: each DEPTH value uses two bytes
+ *
+ *         <----------------------- d-stride ---------------------->
+ *         <----------------------- d-width ----------------------->
+ * [index] 02468                                                   1278
+ *         |||||---------------------------------------------------|
+ * [data]  DDDDDDDDDDDDDDDDDDDDDDDDDDDDD...                        D
+ * [data]  DDDDDDDDDDDDDDDDDDDDDDDDDDDDD...                        D
+ * [data]  DDDDDDDDDDDDDDDDDDDDDDDDDDDDD...                        D
+ * [data]  ......
+ */
+
+dictionary ChannelPixelLayout {
+    required unsigned long              offset;
+    required unsigned long              width;
+    required unsigned long              height;
+    required ChannelPixelLayoutDataType dataType;
+    required unsigned long              stride;
+    required unsigned long              skip;
+};
+
+typedef sequence<ChannelPixelLayout> ImagePixelLayout;
+
+partial interface ImageBitmap {
+    [Throws, Func="mozilla::dom::DOMPrefs::ImageBitmapExtensionsEnabled"]
+    ImageBitmapFormat               findOptimalFormat (optional sequence<ImageBitmapFormat> aPossibleFormats);
+    [Throws, Func="mozilla::dom::DOMPrefs::ImageBitmapExtensionsEnabled"]
+    long                            mappedDataLength (ImageBitmapFormat aFormat);
+    [Throws, Func="mozilla::dom::DOMPrefs::ImageBitmapExtensionsEnabled"]
+    Promise<ImagePixelLayout> mapDataInto (ImageBitmapFormat aFormat, BufferSource aBuffer, long aOffset);
+};
diff --git a/crates/web-sys/webidls/available/ImageBitmapRenderingContext.webidl b/crates/web-sys/webidls/available/ImageBitmapRenderingContext.webidl
new file mode 100644
index 00000000..b94447cd
--- /dev/null
+++ b/crates/web-sys/webidls/available/ImageBitmapRenderingContext.webidl
@@ -0,0 +1,40 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://wiki.whatwg.org/wiki/OffscreenCanvas
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// The new ImageBitmapRenderingContext is a canvas rendering context
+// which only provides the functionality to replace the canvas's
+// contents with the given ImageBitmap. Its context id (the first argument
+// to getContext) is "bitmaprenderer".
+[Exposed=(Window,Worker)]
+interface ImageBitmapRenderingContext {
+  // Displays the given ImageBitmap in the canvas associated with this
+  // rendering context. Ownership of the ImageBitmap is transferred to
+  // the canvas. The caller may not use its reference to the ImageBitmap
+  // after making this call. (This semantic is crucial to enable prompt
+  // reclamation of expensive graphics resources, rather than relying on
+  // garbage collection to do so.)
+  //
+  // The ImageBitmap conceptually replaces the canvas's bitmap, but
+  // it does not change the canvas's intrinsic width or height.
+  //
+  // The ImageBitmap, when displayed, is clipped to the rectangle
+  // defined by the canvas's instrinsic width and height. Pixels that
+  // would be covered by the canvas's bitmap which are not covered by
+  // the supplied ImageBitmap are rendered transparent black. Any CSS
+  // styles affecting the display of the canvas are applied as usual.
+  void transferFromImageBitmap(ImageBitmap bitmap);
+
+  // Deprecated version of transferFromImageBitmap
+  [Deprecated="ImageBitmapRenderingContext_TransferImageBitmap"]
+  void transferImageBitmap(ImageBitmap bitmap);
+};
diff --git a/crates/web-sys/webidls/available/ImageCapture.webidl b/crates/web-sys/webidls/available/ImageCapture.webidl
new file mode 100644
index 00000000..22f33033
--- /dev/null
+++ b/crates/web-sys/webidls/available/ImageCapture.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/dap/raw-file/default/media-stream-capture/ImageCapture.html
+ *
+ * Copyright © 2012-2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved.
+ * W3C liability, trademark and document use rules apply.
+ */
+
+[Pref="dom.imagecapture.enabled", Constructor(VideoStreamTrack track)]
+interface ImageCapture : EventTarget {
+  // readonly attribute PhotoSettingsOptions photoSettingsOptions;
+  readonly attribute VideoStreamTrack videoStreamTrack;
+  attribute EventHandler onphoto;
+  attribute EventHandler onerror;
+  // attribute EventHandler onphotosettingschange;
+  // attribute EventHandler onframegrab;
+
+  // [Throws]
+  // void setOptions (PhotoSettings? photoSettings);
+  [Throws]
+  void takePhoto();
+  // [Throws]
+  // void getFrame();
+};
diff --git a/crates/web-sys/webidls/available/ImageCaptureErrorEvent.webidl b/crates/web-sys/webidls/available/ImageCaptureErrorEvent.webidl
new file mode 100644
index 00000000..b7300aa3
--- /dev/null
+++ b/crates/web-sys/webidls/available/ImageCaptureErrorEvent.webidl
@@ -0,0 +1,32 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/dap/raw-file/default/media-stream-capture/ImageCapture.html
+ *
+ * Copyright © 2012-2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved.
+ * W3C liability, trademark and document use rules apply.
+ */
+
+[Pref="dom.imagecapture.enabled",
+Constructor(DOMString type, optional ImageCaptureErrorEventInit imageCaptureErrorInitDict)]
+interface ImageCaptureErrorEvent : Event {
+  readonly attribute ImageCaptureError? imageCaptureError;
+};
+
+dictionary ImageCaptureErrorEventInit : EventInit {
+  ImageCaptureError? imageCaptureError = null;
+};
+
+[NoInterfaceObject]
+interface ImageCaptureError {
+  const unsigned short FRAME_GRAB_ERROR = 1;
+  const unsigned short SETTINGS_ERROR = 2;
+  const unsigned short PHOTO_ERROR = 3;
+  const unsigned short ERROR_UNKNOWN = 4;
+  readonly attribute unsigned short code;
+  readonly attribute DOMString message;
+};
+
diff --git a/crates/web-sys/webidls/available/ImageData.webidl b/crates/web-sys/webidls/available/ImageData.webidl
new file mode 100644
index 00000000..f6000bd0
--- /dev/null
+++ b/crates/web-sys/webidls/available/ImageData.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html#imagedata
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and Opera Software ASA.
+ * You are granted a license to use, reproduce and create derivative works of this document.
+ */
+
+[Constructor(unsigned long sw, unsigned long sh),
+ Constructor(Uint8ClampedArray data, unsigned long sw, optional unsigned long sh),
+ Exposed=(Window,Worker)]
+interface ImageData {
+ [Constant]
+ readonly attribute unsigned long width;
+ [Constant]
+ readonly attribute unsigned long height;
+ [Constant, StoreInSlot]
+ readonly attribute Uint8ClampedArray data;
+};
diff --git a/crates/web-sys/webidls/available/ImageDocument.webidl b/crates/web-sys/webidls/available/ImageDocument.webidl
new file mode 100644
index 00000000..571e345d
--- /dev/null
+++ b/crates/web-sys/webidls/available/ImageDocument.webidl
@@ -0,0 +1,41 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is:
+ * dom/html/public/nsIImageDocument.idl
+ */
+
+interface imgIRequest;
+
+[ChromeOnly, OverrideBuiltins]
+interface ImageDocument : HTMLDocument {
+  /* Whether the image is overflowing visible area. */
+  readonly attribute boolean imageIsOverflowing;
+
+  /* Whether the image has been resized to fit visible area. */
+  readonly attribute boolean imageIsResized;
+
+  /* The image request being displayed in the content area */
+  [Throws]
+  readonly attribute imgIRequest? imageRequest;
+
+  /* Resize the image to fit visible area. */
+  void shrinkToFit();
+
+  /* Restore image original size. */
+  void restoreImage();
+
+  /* Restore the image, trying to keep a certain pixel in the same position.
+   * The coordinate system is that of the shrunken image.
+   */
+  void restoreImageTo(long x, long y);
+
+  /* A helper method for switching between states.
+   * The switching logic is as follows. If the image has been resized
+   * restore image original size, otherwise if the image is overflowing
+   * current visible area resize the image to fit the area.
+   */
+  void toggleImageSize();
+};
diff --git a/crates/web-sys/webidls/available/InputEvent.webidl b/crates/web-sys/webidls/available/InputEvent.webidl
new file mode 100644
index 00000000..805b0510
--- /dev/null
+++ b/crates/web-sys/webidls/available/InputEvent.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Constructor(DOMString type, optional InputEventInit eventInitDict)]
+interface InputEvent : UIEvent
+{
+  readonly attribute boolean       isComposing;
+};
+
+dictionary InputEventInit : UIEventInit
+{
+  boolean isComposing = false;
+};
diff --git a/crates/web-sys/webidls/available/InstallTrigger.webidl b/crates/web-sys/webidls/available/InstallTrigger.webidl
new file mode 100644
index 00000000..68f48ddc
--- /dev/null
+++ b/crates/web-sys/webidls/available/InstallTrigger.webidl
@@ -0,0 +1,90 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+
+/**
+ * A callback function that webpages can implement to be notified when triggered
+ * installs complete.
+ */
+callback InstallTriggerCallback = void(DOMString url, short status);
+
+dictionary InstallTriggerData {
+  DOMString URL;
+  DOMString? IconURL;
+  DOMString? Hash;
+};
+
+/**
+ * The interface for the InstallTrigger object available to all websites.
+ */
+[ChromeOnly,
+ JSImplementation="@mozilla.org/addons/installtrigger;1"]
+interface InstallTriggerImpl {
+  /**
+   * Retained for backwards compatibility.
+   */
+  const unsigned short SKIN = 1;
+  const unsigned short LOCALE = 2;
+  const unsigned short CONTENT = 4;
+  const unsigned short PACKAGE = 7;
+
+  /**
+   * Tests if installation is enabled.
+   */
+  boolean enabled();
+
+  /**
+   * Tests if installation is enabled.
+   *
+   * @deprecated Use "enabled" in the future.
+   */
+  boolean updateEnabled();
+
+  /**
+   * Starts a new installation of a set of add-ons.
+   *
+   * @param  aArgs
+   *         The add-ons to install. This should be a JS object, each property
+   *         is the name of an add-on to be installed. The value of the
+   *         property should either be a string URL, or an object with the
+   *         following properties:
+   *          * URL for the add-on's URL
+   *          * IconURL for an icon for the add-on
+   *          * Hash for a hash of the add-on
+   * @param  aCallback
+   *         A callback to call as each installation succeeds or fails
+   * @return true if the installations were successfully started
+   */
+  boolean install(record<DOMString, (DOMString or InstallTriggerData)> installs,
+                  optional InstallTriggerCallback callback);
+
+  /**
+   * Starts installing a new add-on.
+   *
+   * @deprecated use "install" in the future.
+   *
+   * @param  aType
+   *         Unused, retained for backwards compatibility
+   * @param  aUrl
+   *         The URL of the add-on
+   * @param  aSkin
+   *         Unused, retained for backwards compatibility
+   * @return true if the installation was successfully started
+   */
+  boolean installChrome(unsigned short type, DOMString url, DOMString skin);
+
+  /**
+   * Starts installing a new add-on.
+   *
+   * @deprecated use "install" in the future.
+   *
+   * @param  aUrl
+   *         The URL of the add-on
+   * @param  aFlags
+   *         Unused, retained for backwards compatibility
+   * @return true if the installation was successfully started
+   */
+  boolean startSoftwareUpdate(DOMString url, optional unsigned short flags);
+};
diff --git a/crates/web-sys/webidls/available/IntersectionObserver.webidl b/crates/web-sys/webidls/available/IntersectionObserver.webidl
new file mode 100644
index 00000000..8c66394b
--- /dev/null
+++ b/crates/web-sys/webidls/available/IntersectionObserver.webidl
@@ -0,0 +1,62 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://wicg.github.io/IntersectionObserver/
+ */
+
+[ProbablyShortLivingWrapper, Pref="dom.IntersectionObserver.enabled"]
+interface IntersectionObserverEntry {
+  [Constant]
+  readonly attribute DOMHighResTimeStamp time;
+  [Constant]
+  readonly attribute DOMRectReadOnly? rootBounds;
+  [Constant]
+  readonly attribute DOMRectReadOnly boundingClientRect;
+  [Constant]
+  readonly attribute DOMRectReadOnly intersectionRect;
+  [Constant]
+  readonly attribute boolean isIntersecting;
+  [Constant]
+  readonly attribute double intersectionRatio;
+  [Constant]
+  readonly attribute Element target;
+};
+
+[Constructor(IntersectionCallback intersectionCallback,
+             optional IntersectionObserverInit options),
+ Pref="dom.IntersectionObserver.enabled"]
+interface IntersectionObserver {
+  [Constant]
+  readonly attribute Element? root;
+  [Constant]
+  readonly attribute DOMString rootMargin;
+  [Constant,Cached]
+  readonly attribute sequence<double> thresholds;
+  void observe(Element target);
+  void unobserve(Element target);
+  void disconnect();
+  sequence<IntersectionObserverEntry> takeRecords();
+
+  [ChromeOnly]
+  readonly attribute IntersectionCallback intersectionCallback;
+};
+
+callback IntersectionCallback =
+  void (sequence<IntersectionObserverEntry> entries, IntersectionObserver observer);
+
+dictionary IntersectionObserverEntryInit {
+  required DOMHighResTimeStamp time;
+  required DOMRectInit rootBounds;
+  required DOMRectInit boundingClientRect;
+  required DOMRectInit intersectionRect;
+  required Element target;
+};
+
+dictionary IntersectionObserverInit {
+  Element?  root = null;
+  DOMString rootMargin = "0px";
+  (double or sequence<double>) threshold = 0;
+};
diff --git a/crates/web-sys/webidls/available/IntlUtils.webidl b/crates/web-sys/webidls/available/IntlUtils.webidl
new file mode 100644
index 00000000..c70e0f95
--- /dev/null
+++ b/crates/web-sys/webidls/available/IntlUtils.webidl
@@ -0,0 +1,73 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+dictionary DisplayNameOptions {
+  DOMString style;
+  sequence<DOMString> keys;
+};
+
+dictionary DisplayNameResult {
+  DOMString locale;
+  DOMString style;
+  record<DOMString, DOMString> values;
+};
+
+dictionary LocaleInfo {
+  DOMString locale;
+  DOMString direction;
+};
+
+/**
+ * The IntlUtils interface provides helper functions for localization.
+ */
+[NoInterfaceObject]
+interface IntlUtils {
+  /**
+   * Helper function to retrieve the localized values for a list of requested
+   * keys.
+   *
+   * The function takes two arguments - locales which is a list of locale
+   * strings and options which is an object with two optional properties:
+   *
+   *   keys:
+   *     an Array of string values that are paths to individual terms
+   *
+   *   style:
+   *     a String with a value "long", "short" or "narrow"
+   *
+   * It returns an object with properties:
+   *
+   *   locale:
+   *     a negotiated locale string
+   *
+   *   style:
+   *     negotiated style
+   *
+   *   values:
+   *     a key-value pair list of requested keys and corresponding translated
+   *     values
+   *
+   */
+  [Throws]
+  DisplayNameResult getDisplayNames(sequence<DOMString> locales,
+                                    optional DisplayNameOptions options);
+
+  /**
+   * Helper function to retrieve useful information about a locale.
+   *
+   * The function takes one argument - locales which is a list of locale
+   * strings.
+   *
+   * It returns an object with properties:
+   *
+   *   locale:
+   *     a negotiated locale string
+   *
+   *   direction:
+   *     text direction, "ltr" or "rtl"
+   *
+   */
+  [Throws]
+  LocaleInfo getLocaleInfo(sequence<DOMString> locales);
+};
diff --git a/crates/web-sys/webidls/available/IterableIterator.webidl b/crates/web-sys/webidls/available/IterableIterator.webidl
new file mode 100644
index 00000000..633b67b1
--- /dev/null
+++ b/crates/web-sys/webidls/available/IterableIterator.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+dictionary IterableKeyOrValueResult {
+  any value;
+  boolean done = false;
+};
+
+dictionary IterableKeyAndValueResult {
+  sequence<any> value = [];
+  boolean done = false;
+};
diff --git a/crates/web-sys/webidls/available/KeyAlgorithm.webidl b/crates/web-sys/webidls/available/KeyAlgorithm.webidl
new file mode 100644
index 00000000..260b1e62
--- /dev/null
+++ b/crates/web-sys/webidls/available/KeyAlgorithm.webidl
@@ -0,0 +1,37 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/WebCryptoAPI/
+ */
+
+dictionary KeyAlgorithm {
+  required DOMString name;
+};
+
+dictionary AesKeyAlgorithm : KeyAlgorithm {
+  required unsigned short length;
+};
+
+dictionary EcKeyAlgorithm : KeyAlgorithm {
+  required DOMString namedCurve;
+};
+
+dictionary HmacKeyAlgorithm : KeyAlgorithm {
+  required KeyAlgorithm hash;
+  required unsigned long length;
+};
+
+dictionary RsaHashedKeyAlgorithm : KeyAlgorithm {
+  required unsigned short modulusLength;
+  required Uint8Array publicExponent;
+  required KeyAlgorithm hash;
+};
+
+dictionary DhKeyAlgorithm : KeyAlgorithm {
+  required Uint8Array prime;
+  required Uint8Array generator;
+};
+
diff --git a/crates/web-sys/webidls/available/KeyEvent.webidl b/crates/web-sys/webidls/available/KeyEvent.webidl
new file mode 100644
index 00000000..6fd66afc
--- /dev/null
+++ b/crates/web-sys/webidls/available/KeyEvent.webidl
@@ -0,0 +1,243 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+// http://www.w3.org/TR/1999/WD-DOM-Level-2-19990923/events.html#Events-KeyEvent
+interface KeyEvent
+{
+  const unsigned long DOM_VK_CANCEL         = 0x03;
+  const unsigned long DOM_VK_HELP           = 0x06;
+  const unsigned long DOM_VK_BACK_SPACE     = 0x08;
+  const unsigned long DOM_VK_TAB            = 0x09;
+  const unsigned long DOM_VK_CLEAR          = 0x0C;
+  const unsigned long DOM_VK_RETURN         = 0x0D;
+  // DOM_VK_ENTER has been never used for representing native key events.
+  // Therefore, it's removed for preventing developers being confused.
+  // const unsigned long DOM_VK_ENTER          = 0x0E;
+  const unsigned long DOM_VK_SHIFT          = 0x10;
+  const unsigned long DOM_VK_CONTROL        = 0x11;
+  const unsigned long DOM_VK_ALT            = 0x12;
+  const unsigned long DOM_VK_PAUSE          = 0x13;
+  const unsigned long DOM_VK_CAPS_LOCK      = 0x14;
+  const unsigned long DOM_VK_KANA           = 0x15;
+  const unsigned long DOM_VK_HANGUL         = 0x15;
+  const unsigned long DOM_VK_EISU           = 0x16; // Japanese Mac keyboard only
+  const unsigned long DOM_VK_JUNJA          = 0x17;
+  const unsigned long DOM_VK_FINAL          = 0x18;
+  const unsigned long DOM_VK_HANJA          = 0x19;
+  const unsigned long DOM_VK_KANJI          = 0x19;
+  const unsigned long DOM_VK_ESCAPE         = 0x1B;
+  const unsigned long DOM_VK_CONVERT        = 0x1C;
+  const unsigned long DOM_VK_NONCONVERT     = 0x1D;
+  const unsigned long DOM_VK_ACCEPT         = 0x1E;
+  const unsigned long DOM_VK_MODECHANGE     = 0x1F;
+  const unsigned long DOM_VK_SPACE          = 0x20;
+  const unsigned long DOM_VK_PAGE_UP        = 0x21;
+  const unsigned long DOM_VK_PAGE_DOWN      = 0x22;
+  const unsigned long DOM_VK_END            = 0x23;
+  const unsigned long DOM_VK_HOME           = 0x24;
+  const unsigned long DOM_VK_LEFT           = 0x25;
+  const unsigned long DOM_VK_UP             = 0x26;
+  const unsigned long DOM_VK_RIGHT          = 0x27;
+  const unsigned long DOM_VK_DOWN           = 0x28;
+  const unsigned long DOM_VK_SELECT         = 0x29;
+  const unsigned long DOM_VK_PRINT          = 0x2A;
+  const unsigned long DOM_VK_EXECUTE        = 0x2B;
+  const unsigned long DOM_VK_PRINTSCREEN    = 0x2C;
+  const unsigned long DOM_VK_INSERT         = 0x2D;
+  const unsigned long DOM_VK_DELETE         = 0x2E;
+
+  // DOM_VK_0 - DOM_VK_9 match their ascii values
+  const unsigned long DOM_VK_0              = 0x30;
+  const unsigned long DOM_VK_1              = 0x31;
+  const unsigned long DOM_VK_2              = 0x32;
+  const unsigned long DOM_VK_3              = 0x33;
+  const unsigned long DOM_VK_4              = 0x34;
+  const unsigned long DOM_VK_5              = 0x35;
+  const unsigned long DOM_VK_6              = 0x36;
+  const unsigned long DOM_VK_7              = 0x37;
+  const unsigned long DOM_VK_8              = 0x38;
+  const unsigned long DOM_VK_9              = 0x39;
+
+  const unsigned long DOM_VK_COLON          = 0x3A;
+  const unsigned long DOM_VK_SEMICOLON      = 0x3B;
+  const unsigned long DOM_VK_LESS_THAN      = 0x3C;
+  const unsigned long DOM_VK_EQUALS         = 0x3D;
+  const unsigned long DOM_VK_GREATER_THAN   = 0x3E;
+  const unsigned long DOM_VK_QUESTION_MARK  = 0x3F;
+  const unsigned long DOM_VK_AT             = 0x40;
+
+  // DOM_VK_A - DOM_VK_Z match their ascii values
+  const unsigned long DOM_VK_A              = 0x41;
+  const unsigned long DOM_VK_B              = 0x42;
+  const unsigned long DOM_VK_C              = 0x43;
+  const unsigned long DOM_VK_D              = 0x44;
+  const unsigned long DOM_VK_E              = 0x45;
+  const unsigned long DOM_VK_F              = 0x46;
+  const unsigned long DOM_VK_G              = 0x47;
+  const unsigned long DOM_VK_H              = 0x48;
+  const unsigned long DOM_VK_I              = 0x49;
+  const unsigned long DOM_VK_J              = 0x4A;
+  const unsigned long DOM_VK_K              = 0x4B;
+  const unsigned long DOM_VK_L              = 0x4C;
+  const unsigned long DOM_VK_M              = 0x4D;
+  const unsigned long DOM_VK_N              = 0x4E;
+  const unsigned long DOM_VK_O              = 0x4F;
+  const unsigned long DOM_VK_P              = 0x50;
+  const unsigned long DOM_VK_Q              = 0x51;
+  const unsigned long DOM_VK_R              = 0x52;
+  const unsigned long DOM_VK_S              = 0x53;
+  const unsigned long DOM_VK_T              = 0x54;
+  const unsigned long DOM_VK_U              = 0x55;
+  const unsigned long DOM_VK_V              = 0x56;
+  const unsigned long DOM_VK_W              = 0x57;
+  const unsigned long DOM_VK_X              = 0x58;
+  const unsigned long DOM_VK_Y              = 0x59;
+  const unsigned long DOM_VK_Z              = 0x5A;
+
+  const unsigned long DOM_VK_WIN            = 0x5B;
+  const unsigned long DOM_VK_CONTEXT_MENU   = 0x5D;
+  const unsigned long DOM_VK_SLEEP          = 0x5F;
+
+  // Numpad keys
+  const unsigned long DOM_VK_NUMPAD0        = 0x60;
+  const unsigned long DOM_VK_NUMPAD1        = 0x61;
+  const unsigned long DOM_VK_NUMPAD2        = 0x62;
+  const unsigned long DOM_VK_NUMPAD3        = 0x63;
+  const unsigned long DOM_VK_NUMPAD4        = 0x64;
+  const unsigned long DOM_VK_NUMPAD5        = 0x65;
+  const unsigned long DOM_VK_NUMPAD6        = 0x66;
+  const unsigned long DOM_VK_NUMPAD7        = 0x67;
+  const unsigned long DOM_VK_NUMPAD8        = 0x68;
+  const unsigned long DOM_VK_NUMPAD9        = 0x69;
+  const unsigned long DOM_VK_MULTIPLY       = 0x6A;
+  const unsigned long DOM_VK_ADD            = 0x6B;
+  const unsigned long DOM_VK_SEPARATOR      = 0x6C;
+  const unsigned long DOM_VK_SUBTRACT       = 0x6D;
+  const unsigned long DOM_VK_DECIMAL        = 0x6E;
+  const unsigned long DOM_VK_DIVIDE         = 0x6F;
+
+  const unsigned long DOM_VK_F1             = 0x70;
+  const unsigned long DOM_VK_F2             = 0x71;
+  const unsigned long DOM_VK_F3             = 0x72;
+  const unsigned long DOM_VK_F4             = 0x73;
+  const unsigned long DOM_VK_F5             = 0x74;
+  const unsigned long DOM_VK_F6             = 0x75;
+  const unsigned long DOM_VK_F7             = 0x76;
+  const unsigned long DOM_VK_F8             = 0x77;
+  const unsigned long DOM_VK_F9             = 0x78;
+  const unsigned long DOM_VK_F10            = 0x79;
+  const unsigned long DOM_VK_F11            = 0x7A;
+  const unsigned long DOM_VK_F12            = 0x7B;
+  const unsigned long DOM_VK_F13            = 0x7C;
+  const unsigned long DOM_VK_F14            = 0x7D;
+  const unsigned long DOM_VK_F15            = 0x7E;
+  const unsigned long DOM_VK_F16            = 0x7F;
+  const unsigned long DOM_VK_F17            = 0x80;
+  const unsigned long DOM_VK_F18            = 0x81;
+  const unsigned long DOM_VK_F19            = 0x82;
+  const unsigned long DOM_VK_F20            = 0x83;
+  const unsigned long DOM_VK_F21            = 0x84;
+  const unsigned long DOM_VK_F22            = 0x85;
+  const unsigned long DOM_VK_F23            = 0x86;
+  const unsigned long DOM_VK_F24            = 0x87;
+
+  const unsigned long DOM_VK_NUM_LOCK       = 0x90;
+  const unsigned long DOM_VK_SCROLL_LOCK    = 0x91;
+
+  // OEM specific virtual keyCode of Windows should pass through DOM keyCode
+  // for compatibility with the other web browsers on Windows.
+  const unsigned long DOM_VK_WIN_OEM_FJ_JISHO   = 0x92;
+  const unsigned long DOM_VK_WIN_OEM_FJ_MASSHOU = 0x93;
+  const unsigned long DOM_VK_WIN_OEM_FJ_TOUROKU = 0x94;
+  const unsigned long DOM_VK_WIN_OEM_FJ_LOYA    = 0x95;
+  const unsigned long DOM_VK_WIN_OEM_FJ_ROYA    = 0x96;
+
+  const unsigned long DOM_VK_CIRCUMFLEX     = 0xA0;
+  const unsigned long DOM_VK_EXCLAMATION    = 0xA1;
+  const unsigned long DOM_VK_DOUBLE_QUOTE   = 0xA2;
+  const unsigned long DOM_VK_HASH           = 0xA3;
+  const unsigned long DOM_VK_DOLLAR         = 0xA4;
+  const unsigned long DOM_VK_PERCENT        = 0xA5;
+  const unsigned long DOM_VK_AMPERSAND      = 0xA6;
+  const unsigned long DOM_VK_UNDERSCORE     = 0xA7;
+  const unsigned long DOM_VK_OPEN_PAREN     = 0xA8;
+  const unsigned long DOM_VK_CLOSE_PAREN    = 0xA9;
+  const unsigned long DOM_VK_ASTERISK       = 0xAA;
+  const unsigned long DOM_VK_PLUS           = 0xAB;
+  const unsigned long DOM_VK_PIPE           = 0xAC;
+  const unsigned long DOM_VK_HYPHEN_MINUS   = 0xAD;
+
+  const unsigned long DOM_VK_OPEN_CURLY_BRACKET  = 0xAE;
+  const unsigned long DOM_VK_CLOSE_CURLY_BRACKET = 0xAF;
+
+  const unsigned long DOM_VK_TILDE          = 0xB0;
+
+  const unsigned long DOM_VK_VOLUME_MUTE    = 0xB5;
+  const unsigned long DOM_VK_VOLUME_DOWN    = 0xB6;
+  const unsigned long DOM_VK_VOLUME_UP      = 0xB7;
+
+  const unsigned long DOM_VK_COMMA          = 0xBC;
+  const unsigned long DOM_VK_PERIOD         = 0xBE;
+  const unsigned long DOM_VK_SLASH          = 0xBF;
+  const unsigned long DOM_VK_BACK_QUOTE     = 0xC0;
+  const unsigned long DOM_VK_OPEN_BRACKET   = 0xDB; // square bracket
+  const unsigned long DOM_VK_BACK_SLASH     = 0xDC;
+  const unsigned long DOM_VK_CLOSE_BRACKET  = 0xDD; // square bracket
+  const unsigned long DOM_VK_QUOTE          = 0xDE; // Apostrophe
+
+  const unsigned long DOM_VK_META           = 0xE0;
+  const unsigned long DOM_VK_ALTGR          = 0xE1;
+
+  // OEM specific virtual keyCode of Windows should pass through DOM keyCode
+  // for compatibility with the other web browsers on Windows.
+  const unsigned long DOM_VK_WIN_ICO_HELP    = 0xE3;
+  const unsigned long DOM_VK_WIN_ICO_00      = 0xE4;
+
+  // IME processed key.
+  const unsigned long DOM_VK_PROCESSKEY      = 0xE5;
+
+  // OEM specific virtual keyCode of Windows should pass through DOM keyCode
+  // for compatibility with the other web browsers on Windows.
+  const unsigned long DOM_VK_WIN_ICO_CLEAR   = 0xE6;
+  const unsigned long DOM_VK_WIN_OEM_RESET   = 0xE9;
+  const unsigned long DOM_VK_WIN_OEM_JUMP    = 0xEA;
+  const unsigned long DOM_VK_WIN_OEM_PA1     = 0xEB;
+  const unsigned long DOM_VK_WIN_OEM_PA2     = 0xEC;
+  const unsigned long DOM_VK_WIN_OEM_PA3     = 0xED;
+  const unsigned long DOM_VK_WIN_OEM_WSCTRL  = 0xEE;
+  const unsigned long DOM_VK_WIN_OEM_CUSEL   = 0xEF;
+  const unsigned long DOM_VK_WIN_OEM_ATTN    = 0xF0;
+  const unsigned long DOM_VK_WIN_OEM_FINISH  = 0xF1;
+  const unsigned long DOM_VK_WIN_OEM_COPY    = 0xF2;
+  const unsigned long DOM_VK_WIN_OEM_AUTO    = 0xF3;
+  const unsigned long DOM_VK_WIN_OEM_ENLW    = 0xF4;
+  const unsigned long DOM_VK_WIN_OEM_BACKTAB = 0xF5;
+
+  // Following keys are not used on most keyboards.  However, for compatibility
+  // with other browsers on Windows, we should define them.
+  const unsigned long DOM_VK_ATTN           = 0xF6;
+  const unsigned long DOM_VK_CRSEL          = 0xF7;
+  const unsigned long DOM_VK_EXSEL          = 0xF8;
+  const unsigned long DOM_VK_EREOF          = 0xF9;
+  const unsigned long DOM_VK_PLAY           = 0xFA;
+  const unsigned long DOM_VK_ZOOM           = 0xFB;
+  const unsigned long DOM_VK_PA1            = 0xFD;
+
+  // OEM specific virtual keyCode of Windows should pass through DOM keyCode
+  // for compatibility with the other web browsers on Windows.
+  const unsigned long DOM_VK_WIN_OEM_CLEAR  = 0xFE;
+
+  void initKeyEvent(DOMString type,
+                    optional boolean canBubble = false,
+                    optional boolean cancelable = false,
+                    optional Window? view = null,
+                    optional boolean ctrlKey = false,
+                    optional boolean altKey = false,
+                    optional boolean shiftKey = false,
+                    optional boolean metaKey = false,
+                    optional unsigned long keyCode = 0,
+                    optional unsigned long charCode = 0);
+};
diff --git a/crates/web-sys/webidls/available/KeyIdsInitData.webidl b/crates/web-sys/webidls/available/KeyIdsInitData.webidl
new file mode 100644
index 00000000..108a5572
--- /dev/null
+++ b/crates/web-sys/webidls/available/KeyIdsInitData.webidl
@@ -0,0 +1,11 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+// "KeyIds" EME init data format definition/parser, as defined by
+// https://w3c.github.io/encrypted-media/format-registry/initdata/keyids.html
+dictionary KeyIdsInitData {
+  required sequence<DOMString> kids;
+};
diff --git a/crates/web-sys/webidls/available/KeyboardEvent.webidl b/crates/web-sys/webidls/available/KeyboardEvent.webidl
new file mode 100644
index 00000000..28e35c74
--- /dev/null
+++ b/crates/web-sys/webidls/available/KeyboardEvent.webidl
@@ -0,0 +1,71 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Constructor(DOMString typeArg, optional KeyboardEventInit keyboardEventInitDict)]
+interface KeyboardEvent : UIEvent
+{
+  readonly attribute unsigned long    charCode;
+  [NeedsCallerType]
+  readonly attribute unsigned long    keyCode;
+
+  [NeedsCallerType]
+  readonly attribute boolean          altKey;
+  [NeedsCallerType]
+  readonly attribute boolean          ctrlKey;
+  [NeedsCallerType]
+  readonly attribute boolean          shiftKey;
+  readonly attribute boolean          metaKey;
+
+  [NeedsCallerType]
+  boolean getModifierState(DOMString key);
+
+  const unsigned long DOM_KEY_LOCATION_STANDARD = 0x00;
+  const unsigned long DOM_KEY_LOCATION_LEFT     = 0x01;
+  const unsigned long DOM_KEY_LOCATION_RIGHT    = 0x02;
+  const unsigned long DOM_KEY_LOCATION_NUMPAD   = 0x03;
+
+  readonly attribute unsigned long location;
+  readonly attribute boolean       repeat;
+  readonly attribute boolean       isComposing;
+
+  readonly attribute DOMString key;
+  [NeedsCallerType]
+  readonly attribute DOMString code;
+
+  [Throws]
+  void initKeyboardEvent(DOMString typeArg,
+                         optional boolean bubblesArg = false,
+                         optional boolean cancelableArg = false,
+                         optional Window? viewArg = null,
+                         optional DOMString keyArg = "",
+                         optional unsigned long locationArg = 0,
+                         optional boolean ctrlKey = false,
+                         optional boolean altKey = false,
+                         optional boolean shiftKey = false,
+                         optional boolean metaKey = false);
+
+  // This returns the initialized dictionary for generating a
+  // same-type keyboard event
+  [Cached, ChromeOnly, Constant]
+  readonly attribute KeyboardEventInit initDict;
+};
+
+dictionary KeyboardEventInit : EventModifierInit
+{
+  DOMString      key           = "";
+  DOMString      code          = "";
+  unsigned long  location      = 0;
+  boolean        repeat        = false;
+  boolean        isComposing   = false;
+
+  // legacy attributes
+  unsigned long  charCode      = 0;
+  unsigned long  keyCode       = 0;
+  unsigned long  which         = 0;
+};
+
+// Mozilla extensions
+KeyboardEvent implements KeyEvent;
diff --git a/crates/web-sys/webidls/available/KeyframeAnimationOptions.webidl b/crates/web-sys/webidls/available/KeyframeAnimationOptions.webidl
new file mode 100644
index 00000000..047f46ed
--- /dev/null
+++ b/crates/web-sys/webidls/available/KeyframeAnimationOptions.webidl
@@ -0,0 +1,14 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/fxtf/web-animations/#the-animatable-interface
+ *
+ * Copyright © 2014 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+// This typedef is off in its own file, because of bug 995352.
+typedef (unrestricted double or KeyframeAnimationOptions) UnrestrictedDoubleOrKeyframeAnimationOptions;
diff --git a/crates/web-sys/webidls/available/KeyframeEffect.webidl b/crates/web-sys/webidls/available/KeyframeEffect.webidl
new file mode 100644
index 00000000..f6d9203f
--- /dev/null
+++ b/crates/web-sys/webidls/available/KeyframeEffect.webidl
@@ -0,0 +1,57 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/web-animations/#the-keyframeeffect-interfaces
+ *
+ * Copyright © 2015 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum IterationCompositeOperation {
+  "replace",
+  "accumulate"
+};
+
+dictionary KeyframeEffectOptions : EffectTiming {
+  IterationCompositeOperation iterationComposite = "replace";
+  CompositeOperation          composite = "replace";
+};
+
+// KeyframeEffect should run in the caller's compartment to do custom
+// processing on the `keyframes` object.
+[Func="nsDocument::IsWebAnimationsEnabled",
+ RunConstructorInCallerCompartment,
+ Constructor ((Element or CSSPseudoElement)? target,
+              object? keyframes,
+              optional (unrestricted double or KeyframeEffectOptions) options),
+ Constructor (KeyframeEffect source)]
+interface KeyframeEffect : AnimationEffect {
+  attribute (Element or CSSPseudoElement)?  target;
+  [NeedsCallerType]
+  attribute IterationCompositeOperation     iterationComposite;
+  attribute CompositeOperation              composite;
+  [Throws] sequence<object> getKeyframes ();
+  [Throws] void             setKeyframes (object? keyframes);
+};
+
+// Non-standard extensions
+dictionary AnimationPropertyValueDetails {
+  required double             offset;
+           DOMString          value;
+           DOMString          easing;
+  required CompositeOperation composite;
+};
+
+dictionary AnimationPropertyDetails {
+  required DOMString                               property;
+  required boolean                                 runningOnCompositor;
+           DOMString                               warning;
+  required sequence<AnimationPropertyValueDetails> values;
+};
+
+partial interface KeyframeEffect {
+  [ChromeOnly, Throws] sequence<AnimationPropertyDetails> getProperties();
+};
diff --git a/crates/web-sys/webidls/available/L10nUtils.webidl b/crates/web-sys/webidls/available/L10nUtils.webidl
new file mode 100644
index 00000000..9e3e2f59
--- /dev/null
+++ b/crates/web-sys/webidls/available/L10nUtils.webidl
@@ -0,0 +1,38 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/**
+ * The following dictionaries are for Mozilla use only. They allow startup
+ * localization runtime to work around the performance cost of Stylo having
+ * to resolve XBL bindings in order to localize DOM in JS.
+ *
+ * Instead, we use `Node.localize` method which handles scanning for localizable
+ * elements and applies the result translations without having to create
+ * JS reflections for them.
+ *
+ * For details on the implementation of the API, see `Node.webidl`.
+ */
+dictionary L10nElement {
+  required DOMString namespaceURI;
+  required DOMString localName;
+  required DOMString l10nId; // value of data-l10n-id
+  DOMString? type = null;
+  DOMString? l10nAttrs = null; // value of data-l10n-attrs
+  object? l10nArgs = null; // json value of data-l10n-args attribute
+};
+
+dictionary AttributeNameValue {
+  required DOMString name;
+  required DOMString value;
+};
+
+dictionary L10nValue {
+  DOMString? value = null;
+  sequence<AttributeNameValue>? attributes = null;
+};
+
+callback L10nCallback =
+  Promise<sequence<L10nValue>> (sequence<L10nElement> l10nElements);
diff --git a/crates/web-sys/webidls/available/LegacyQueryInterface.webidl b/crates/web-sys/webidls/available/LegacyQueryInterface.webidl
new file mode 100644
index 00000000..fe1ebd1e
--- /dev/null
+++ b/crates/web-sys/webidls/available/LegacyQueryInterface.webidl
@@ -0,0 +1,30 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+interface nsISupports;
+interface IID;
+
+[NoInterfaceObject,
+ // Need Exposed here, because this is a mixin onto things like Event
+ // that are exposed in workers.
+ Exposed=(Window,Worker,System)]
+interface LegacyQueryInterface {
+  // Legacy QueryInterface, only exposed to chrome code on the main thread.
+  [Exposed=(Window,System), ChromeOnly]
+  nsISupports QueryInterface(IID iid);
+};
+
+BoxObject implements LegacyQueryInterface;
+DOMParser implements LegacyQueryInterface;
+Document implements LegacyQueryInterface;
+DocumentFragment implements LegacyQueryInterface;
+Element implements LegacyQueryInterface;
+Event implements LegacyQueryInterface;
+Selection implements LegacyQueryInterface;
+TreeColumns implements LegacyQueryInterface;
+TreeContentView implements LegacyQueryInterface;
+Window implements LegacyQueryInterface;
+XMLHttpRequest implements LegacyQueryInterface;
diff --git a/crates/web-sys/webidls/available/LinkStyle.webidl b/crates/web-sys/webidls/available/LinkStyle.webidl
new file mode 100644
index 00000000..db0bc031
--- /dev/null
+++ b/crates/web-sys/webidls/available/LinkStyle.webidl
@@ -0,0 +1,14 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/csswg/cssom/#the-linkstyle-interface
+ */
+
+[NoInterfaceObject]
+interface LinkStyle {
+      readonly attribute StyleSheet? sheet;
+};
+
diff --git a/crates/web-sys/webidls/available/ListBoxObject.webidl b/crates/web-sys/webidls/available/ListBoxObject.webidl
new file mode 100644
index 00000000..b433760a
--- /dev/null
+++ b/crates/web-sys/webidls/available/ListBoxObject.webidl
@@ -0,0 +1,22 @@
+
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[NoInterfaceObject]
+interface ListBoxObject : BoxObject {
+
+  long getRowCount();
+  long getRowHeight();
+  long getNumberOfVisibleRows();
+  long getIndexOfFirstVisibleRow();
+
+  void ensureIndexIsVisible(long rowIndex);
+  void scrollToIndex(long rowIndex);
+  void scrollByLines(long numLines);
+
+  Element? getItemAtIndex(long index);
+  long getIndexOfItem(Element item);
+};
diff --git a/crates/web-sys/webidls/available/LocalMediaStream.webidl b/crates/web-sys/webidls/available/LocalMediaStream.webidl
new file mode 100644
index 00000000..1ef7474a
--- /dev/null
+++ b/crates/web-sys/webidls/available/LocalMediaStream.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origins of this IDL file are
+ * http://dev.w3.org/2011/webrtc/editor/getusermedia.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface LocalMediaStream : MediaStream {
+    void stop();
+};
diff --git a/crates/web-sys/webidls/available/Location.webidl b/crates/web-sys/webidls/available/Location.webidl
new file mode 100644
index 00000000..7381f6d1
--- /dev/null
+++ b/crates/web-sys/webidls/available/Location.webidl
@@ -0,0 +1,53 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-location-interface
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Unforgeable, NonOrdinaryGetPrototypeOf]
+interface Location {
+  // Bug 824857: no support for stringifier attributes yet.
+  //  stringifier attribute USVString href;
+
+  // Bug 824857 should remove this.
+  [Throws, NeedsSubjectPrincipal]
+  stringifier;
+
+  [Throws, CrossOriginWritable, GetterNeedsSubjectPrincipal]
+           attribute USVString href;
+  [Throws, NeedsSubjectPrincipal]
+  readonly attribute USVString origin;
+  [Throws, NeedsSubjectPrincipal]
+           attribute USVString protocol;
+  [Throws, NeedsSubjectPrincipal]
+           attribute USVString host;
+  [Throws, NeedsSubjectPrincipal]
+           attribute USVString hostname;
+  [Throws, NeedsSubjectPrincipal]
+           attribute USVString port;
+  [Throws, NeedsSubjectPrincipal]
+           attribute USVString pathname;
+  [Throws, NeedsSubjectPrincipal]
+           attribute USVString search;
+  [Throws, NeedsSubjectPrincipal]
+           attribute USVString hash;
+
+  [Throws, NeedsSubjectPrincipal]
+  void assign(USVString url);
+
+  [Throws, CrossOriginCallable, NeedsSubjectPrincipal]
+  void replace(USVString url);
+
+  // XXXbz there is no forceget argument in the spec!  See bug 1037721.
+  [Throws, NeedsSubjectPrincipal]
+  void reload(optional boolean forceget = false);
+
+  // Bug 1085214 [SameObject] readonly attribute USVString[] ancestorOrigins;
+};
diff --git a/crates/web-sys/webidls/available/MIDIAccess.webidl b/crates/web-sys/webidls/available/MIDIAccess.webidl
new file mode 100644
index 00000000..97c8be42
--- /dev/null
+++ b/crates/web-sys/webidls/available/MIDIAccess.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-midi-api/
+ */
+
+[SecureContext, Pref="dom.webmidi.enabled"]
+interface MIDIAccess : EventTarget {
+  readonly attribute MIDIInputMap  inputs;
+  readonly attribute MIDIOutputMap outputs;
+           attribute EventHandler  onstatechange;
+  readonly attribute boolean       sysexEnabled;
+};
diff --git a/crates/web-sys/webidls/available/MIDIConnectionEvent.webidl b/crates/web-sys/webidls/available/MIDIConnectionEvent.webidl
new file mode 100644
index 00000000..48231957
--- /dev/null
+++ b/crates/web-sys/webidls/available/MIDIConnectionEvent.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-midi-api/
+ */
+
+[Constructor(DOMString type, optional MIDIConnectionEventInit eventInitDict),
+ SecureContext,
+ Pref="dom.webmidi.enabled"]
+interface MIDIConnectionEvent : Event
+{
+  readonly attribute MIDIPort? port;
+};
+
+dictionary MIDIConnectionEventInit : EventInit
+{
+  MIDIPort? port = null;
+};
diff --git a/crates/web-sys/webidls/available/MIDIInput.webidl b/crates/web-sys/webidls/available/MIDIInput.webidl
new file mode 100644
index 00000000..9cfc4fea
--- /dev/null
+++ b/crates/web-sys/webidls/available/MIDIInput.webidl
@@ -0,0 +1,14 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-midi-api/
+ */
+
+[SecureContext, Pref="dom.webmidi.enabled"]
+interface MIDIInput : MIDIPort {
+  attribute EventHandler onmidimessage;
+};
+
diff --git a/crates/web-sys/webidls/available/MIDIInputMap.webidl b/crates/web-sys/webidls/available/MIDIInputMap.webidl
new file mode 100644
index 00000000..19154ed8
--- /dev/null
+++ b/crates/web-sys/webidls/available/MIDIInputMap.webidl
@@ -0,0 +1,13 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-midi-api/
+ */
+
+[SecureContext, Pref="dom.webmidi.enabled"]
+interface MIDIInputMap {
+  readonly maplike<DOMString, MIDIInput>;
+};
diff --git a/crates/web-sys/webidls/available/MIDIMessageEvent.webidl b/crates/web-sys/webidls/available/MIDIMessageEvent.webidl
new file mode 100644
index 00000000..f9d55dba
--- /dev/null
+++ b/crates/web-sys/webidls/available/MIDIMessageEvent.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-midi-api/
+ */
+
+[Constructor(DOMString type, optional MIDIMessageEventInit eventInitDict),
+ SecureContext,
+ Pref="dom.webmidi.enabled"]
+interface MIDIMessageEvent : Event
+{
+  [Throws]
+  readonly attribute Uint8Array  data;
+};
+
+dictionary MIDIMessageEventInit : EventInit
+{
+  Uint8Array  data;
+};
diff --git a/crates/web-sys/webidls/available/MIDIOptions.webidl b/crates/web-sys/webidls/available/MIDIOptions.webidl
new file mode 100644
index 00000000..314ebec5
--- /dev/null
+++ b/crates/web-sys/webidls/available/MIDIOptions.webidl
@@ -0,0 +1,13 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-midi-api/
+ */
+
+dictionary MIDIOptions {
+  boolean sysex = false;
+  boolean software = false;
+};
diff --git a/crates/web-sys/webidls/available/MIDIOutput.webidl b/crates/web-sys/webidls/available/MIDIOutput.webidl
new file mode 100644
index 00000000..d3c5a46b
--- /dev/null
+++ b/crates/web-sys/webidls/available/MIDIOutput.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-midi-api/
+ */
+
+[SecureContext, Pref="dom.webmidi.enabled"]
+interface MIDIOutput : MIDIPort {
+  [Throws]
+  void send(sequence<octet> data, optional DOMHighResTimeStamp timestamp);
+  void clear();
+};
diff --git a/crates/web-sys/webidls/available/MIDIOutputMap.webidl b/crates/web-sys/webidls/available/MIDIOutputMap.webidl
new file mode 100644
index 00000000..64ac6da3
--- /dev/null
+++ b/crates/web-sys/webidls/available/MIDIOutputMap.webidl
@@ -0,0 +1,13 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-midi-api/
+ */
+
+[SecureContext, Pref="dom.webmidi.enabled"]
+interface MIDIOutputMap {
+  readonly maplike<DOMString, MIDIOutput>;
+};
diff --git a/crates/web-sys/webidls/available/MIDIPort.webidl b/crates/web-sys/webidls/available/MIDIPort.webidl
new file mode 100644
index 00000000..65274ebb
--- /dev/null
+++ b/crates/web-sys/webidls/available/MIDIPort.webidl
@@ -0,0 +1,39 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-midi-api/
+ */
+
+enum MIDIPortType {
+  "input",
+  "output"
+};
+
+enum MIDIPortDeviceState {
+  "disconnected",
+  "connected"
+};
+
+enum MIDIPortConnectionState {
+  "open",
+  "closed",
+  "pending"
+};
+
+[SecureContext, Pref="dom.webmidi.enabled"]
+interface MIDIPort : EventTarget {
+  readonly attribute DOMString    id;
+  readonly attribute DOMString?   manufacturer;
+  readonly attribute DOMString?   name;
+  readonly attribute DOMString?   version;
+  readonly attribute MIDIPortType type;
+  readonly attribute MIDIPortDeviceState state;
+  readonly attribute MIDIPortConnectionState connection;
+           attribute EventHandler onstatechange;
+  Promise<MIDIPort> open();
+  Promise<MIDIPort> close();
+};
+
diff --git a/crates/web-sys/webidls/available/MediaCapabilities.webidl b/crates/web-sys/webidls/available/MediaCapabilities.webidl
new file mode 100644
index 00000000..636f5605
--- /dev/null
+++ b/crates/web-sys/webidls/available/MediaCapabilities.webidl
@@ -0,0 +1,70 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://wicg.github.io/media-capabilities/
+ *
+ * Copyright © 2018 the Contributors to the Media Capabilities Specification
+ */
+
+dictionary MediaConfiguration {
+  VideoConfiguration video;
+  AudioConfiguration audio;
+};
+
+dictionary MediaDecodingConfiguration : MediaConfiguration {
+  required MediaDecodingType type;
+};
+
+dictionary MediaEncodingConfiguration : MediaConfiguration {
+  required MediaEncodingType type;
+};
+
+enum MediaDecodingType {
+  "file",
+  "media-source",
+};
+
+enum MediaEncodingType {
+  "record",
+  "transmission"
+};
+
+// all members are specified as required in the spec.
+// We enforce that requirement in the MediaCapabilities code instead
+// See https://github.com/heycam/webidl/issues/76
+dictionary VideoConfiguration {
+  DOMString contentType;
+  unsigned long width;
+  unsigned long height;
+  unsigned long long bitrate;
+  DOMString framerate;
+};
+
+// contentType member is specified as required in the spec.
+// We enforce that requirement in the MediaCapabilities code instead
+// See https://github.com/heycam/webidl/issues/76
+dictionary AudioConfiguration {
+  DOMString contentType;
+  DOMString channels;
+  unsigned long long bitrate;
+  unsigned long samplerate;
+};
+
+[Exposed=(Window, Worker), Func="mozilla::dom::MediaCapabilities::Enabled",
+ HeaderFile="mozilla/dom/MediaCapabilities.h"]
+interface MediaCapabilitiesInfo {
+  readonly attribute boolean supported;
+  readonly attribute boolean smooth;
+  readonly attribute boolean powerEfficient;
+};
+
+[Exposed=(Window, Worker), Func="mozilla::dom::MediaCapabilities::Enabled"]
+interface MediaCapabilities {
+  [NewObject]
+  Promise<MediaCapabilitiesInfo> decodingInfo(MediaDecodingConfiguration configuration);
+  [NewObject]
+  Promise<MediaCapabilitiesInfo> encodingInfo(MediaEncodingConfiguration configuration);
+};
diff --git a/crates/web-sys/webidls/available/MediaDeviceInfo.webidl b/crates/web-sys/webidls/available/MediaDeviceInfo.webidl
new file mode 100644
index 00000000..023cd82f
--- /dev/null
+++ b/crates/web-sys/webidls/available/MediaDeviceInfo.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2011/webrtc/editor/getusermedia.html
+ */
+
+enum MediaDeviceKind {
+  "audioinput",
+  "audiooutput",
+  "videoinput"
+};
+
+[Func="Navigator::HasUserMediaSupport"]
+interface MediaDeviceInfo {
+  readonly attribute DOMString       deviceId;
+  readonly attribute MediaDeviceKind kind;
+  readonly attribute DOMString       label;
+  readonly attribute DOMString       groupId;
+
+  [Default] object toJSON();
+};
diff --git a/crates/web-sys/webidls/available/MediaDevices.webidl b/crates/web-sys/webidls/available/MediaDevices.webidl
new file mode 100644
index 00000000..a71aa05c
--- /dev/null
+++ b/crates/web-sys/webidls/available/MediaDevices.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2011/webrtc/editor/getusermedia.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Func="Navigator::HasUserMediaSupport"]
+interface MediaDevices : EventTarget {
+  [Pref="media.ondevicechange.enabled"]
+  attribute EventHandler ondevicechange;
+  MediaTrackSupportedConstraints getSupportedConstraints();
+
+  [Throws, NeedsCallerType]
+  Promise<sequence<MediaDeviceInfo>> enumerateDevices();
+
+  [Throws, NeedsCallerType]
+  Promise<MediaStream> getUserMedia(optional MediaStreamConstraints constraints);
+};
diff --git a/crates/web-sys/webidls/available/MediaElementAudioSourceNode.webidl b/crates/web-sys/webidls/available/MediaElementAudioSourceNode.webidl
new file mode 100644
index 00000000..37de3253
--- /dev/null
+++ b/crates/web-sys/webidls/available/MediaElementAudioSourceNode.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary MediaElementAudioSourceOptions {
+    required HTMLMediaElement mediaElement;
+};
+
+[Pref="dom.webaudio.enabled",
+ Constructor(AudioContext context, MediaElementAudioSourceOptions options)]
+interface MediaElementAudioSourceNode : AudioNode {
+
+};
+
+// Mozilla extensions
+MediaElementAudioSourceNode implements AudioNodePassThrough;
+
diff --git a/crates/web-sys/webidls/available/MediaEncryptedEvent.webidl b/crates/web-sys/webidls/available/MediaEncryptedEvent.webidl
new file mode 100644
index 00000000..113d3e62
--- /dev/null
+++ b/crates/web-sys/webidls/available/MediaEncryptedEvent.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/html-media/raw-file/default/encrypted-media/encrypted-media.html
+ *
+ * Copyright © 2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved.
+ * W3C liability, trademark and document use rules apply.
+ */
+
+[Constructor(DOMString type, optional MediaKeyNeededEventInit eventInitDict)]
+interface MediaEncryptedEvent : Event {
+  readonly attribute DOMString initDataType;
+  [Throws]
+  readonly attribute ArrayBuffer? initData;
+};
+
+dictionary MediaKeyNeededEventInit : EventInit {
+  DOMString initDataType = "";
+  ArrayBuffer? initData = null;
+};
diff --git a/crates/web-sys/webidls/available/MediaError.webidl b/crates/web-sys/webidls/available/MediaError.webidl
new file mode 100644
index 00000000..bd1ed4e3
--- /dev/null
+++ b/crates/web-sys/webidls/available/MediaError.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/html/#mediaerror
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+interface MediaError {
+  // Keep these constants in sync with the ones defined in HTMLMediaElement.h
+  const unsigned short MEDIA_ERR_ABORTED = 1;
+  const unsigned short MEDIA_ERR_NETWORK = 2;
+  const unsigned short MEDIA_ERR_DECODE = 3;
+  const unsigned short MEDIA_ERR_SRC_NOT_SUPPORTED = 4;
+
+  [Constant]
+  readonly attribute unsigned short code;
+  readonly attribute DOMString message;
+};
diff --git a/crates/web-sys/webidls/available/MediaKeyError.webidl b/crates/web-sys/webidls/available/MediaKeyError.webidl
new file mode 100644
index 00000000..e9fcd2d7
--- /dev/null
+++ b/crates/web-sys/webidls/available/MediaKeyError.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/html-media/raw-file/default/encrypted-media/encrypted-media.html
+ *
+ * Copyright © 2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved.
+ * W3C liability, trademark and document use rules apply.
+ */
+
+// According to the spec, "The future of error events and MediaKeyError
+// is uncertain."
+// https://www.w3.org/Bugs/Public/show_bug.cgi?id=21798
+interface MediaKeyError : Event {
+  readonly attribute unsigned long systemCode;
+};
diff --git a/crates/web-sys/webidls/available/MediaKeyMessageEvent.webidl b/crates/web-sys/webidls/available/MediaKeyMessageEvent.webidl
new file mode 100644
index 00000000..eabef221
--- /dev/null
+++ b/crates/web-sys/webidls/available/MediaKeyMessageEvent.webidl
@@ -0,0 +1,30 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/html-media/raw-file/default/encrypted-media/encrypted-media.html
+ *
+ * Copyright © 2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved.
+ * W3C liability, trademark and document use rules apply.
+ */
+
+enum MediaKeyMessageType {
+  "license-request",
+  "license-renewal",
+  "license-release",
+  "individualization-request"
+};
+
+[Constructor(DOMString type, MediaKeyMessageEventInit eventInitDict)]
+interface MediaKeyMessageEvent : Event {
+  readonly attribute MediaKeyMessageType messageType;
+  [Throws]
+  readonly attribute ArrayBuffer message;
+};
+
+dictionary MediaKeyMessageEventInit : EventInit {
+  required MediaKeyMessageType messageType;
+  required ArrayBuffer message;
+};
diff --git a/crates/web-sys/webidls/available/MediaKeySession.webidl b/crates/web-sys/webidls/available/MediaKeySession.webidl
new file mode 100644
index 00000000..342483fb
--- /dev/null
+++ b/crates/web-sys/webidls/available/MediaKeySession.webidl
@@ -0,0 +1,45 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/html-media/raw-file/default/encrypted-media/encrypted-media.html
+ *
+ * Copyright © 2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved.
+ * W3C liability, trademark and document use rules apply.
+ */
+
+interface MediaKeySession : EventTarget {
+  // error state
+  readonly attribute MediaKeyError? error;
+
+  // session properties
+  readonly attribute DOMString sessionId;
+
+  readonly attribute unrestricted double expiration;
+
+  readonly attribute Promise<void> closed;
+
+  readonly attribute MediaKeyStatusMap keyStatuses;
+
+  attribute EventHandler onkeystatuseschange;
+
+  attribute EventHandler onmessage;
+
+  [NewObject]
+  Promise<void> generateRequest(DOMString initDataType, BufferSource initData);
+
+  [NewObject]
+  Promise<boolean> load(DOMString sessionId);
+
+  // session operations
+  [NewObject]
+  Promise<void> update(BufferSource response);
+
+  [NewObject]
+  Promise<void> close();
+
+  [NewObject]
+  Promise<void> remove();
+};
diff --git a/crates/web-sys/webidls/available/MediaKeyStatusMap.webidl b/crates/web-sys/webidls/available/MediaKeyStatusMap.webidl
new file mode 100644
index 00000000..648adaf4
--- /dev/null
+++ b/crates/web-sys/webidls/available/MediaKeyStatusMap.webidl
@@ -0,0 +1,29 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/html-media/raw-file/default/encrypted-media/encrypted-media.html
+ *
+ * Copyright © 2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved.
+ * W3C liability, trademark and document use rules apply.
+ */
+
+enum MediaKeyStatus {
+  "usable",
+  "expired",
+  "released",
+  "output-restricted",
+  "output-downscaled",
+  "status-pending",
+  "internal-error"
+};
+
+interface MediaKeyStatusMap {
+  iterable<ArrayBuffer,MediaKeyStatus>;
+  readonly attribute unsigned long size;
+  boolean has (BufferSource keyId);
+  [Throws]
+  any get (BufferSource keyId);
+};
diff --git a/crates/web-sys/webidls/available/MediaKeySystemAccess.webidl b/crates/web-sys/webidls/available/MediaKeySystemAccess.webidl
new file mode 100644
index 00000000..38bcd578
--- /dev/null
+++ b/crates/web-sys/webidls/available/MediaKeySystemAccess.webidl
@@ -0,0 +1,40 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/html-media/raw-file/default/encrypted-media/encrypted-media.html
+ *
+ * Copyright © 2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved.
+ * W3C liability, trademark and document use rules apply.
+ */
+
+enum MediaKeysRequirement {
+  "required",
+  "optional",
+  "not-allowed"
+};
+
+dictionary MediaKeySystemMediaCapability {
+   DOMString contentType = "";
+   DOMString robustness = "";
+};
+
+dictionary MediaKeySystemConfiguration {
+  DOMString                               label = "";
+  sequence<DOMString>                     initDataTypes = [];
+  sequence<MediaKeySystemMediaCapability> audioCapabilities = [];
+  sequence<MediaKeySystemMediaCapability> videoCapabilities = [];
+  MediaKeysRequirement                    distinctiveIdentifier = "optional";
+  MediaKeysRequirement                    persistentState = "optional";
+  sequence<DOMString>                     sessionTypes;
+};
+
+interface MediaKeySystemAccess {
+  readonly    attribute DOMString keySystem;
+  [NewObject]
+  MediaKeySystemConfiguration getConfiguration();
+  [NewObject]
+  Promise<MediaKeys> createMediaKeys();
+};
diff --git a/crates/web-sys/webidls/available/MediaKeys.webidl b/crates/web-sys/webidls/available/MediaKeys.webidl
new file mode 100644
index 00000000..aab679ee
--- /dev/null
+++ b/crates/web-sys/webidls/available/MediaKeys.webidl
@@ -0,0 +1,37 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/html-media/raw-file/default/encrypted-media/encrypted-media.html
+ *
+ * Copyright © 2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved.
+ * W3C liability, trademark and document use rules apply.
+ */
+
+// Note: "persistent-usage-record" session type is unsupported yet, as
+// it's marked as "at risk" in the spec, and Chrome doesn't support it. 
+enum MediaKeySessionType {
+  "temporary",
+  "persistent-license",
+  // persistent-usage-record,
+};
+
+// https://github.com/WICG/media-capabilities/blob/master/eme-extension-policy-check.md
+dictionary MediaKeysPolicy {
+  DOMString minHdcpVersion = "";
+};
+
+interface MediaKeys {
+  readonly attribute DOMString keySystem;
+
+  [NewObject, Throws]
+  MediaKeySession createSession(optional MediaKeySessionType sessionType = "temporary");
+
+  [NewObject]
+  Promise<void> setServerCertificate(BufferSource serverCertificate);
+
+  [Pref="media.eme.hdcp-policy-check.enabled", NewObject]
+  Promise<MediaKeyStatus> getStatusForPolicy(optional MediaKeysPolicy policy);
+};
diff --git a/crates/web-sys/webidls/available/MediaKeysRequestStatus.webidl b/crates/web-sys/webidls/available/MediaKeysRequestStatus.webidl
new file mode 100644
index 00000000..737372f6
--- /dev/null
+++ b/crates/web-sys/webidls/available/MediaKeysRequestStatus.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+enum MediaKeySystemStatus {
+  "available",
+  "api-disabled",
+  "cdm-disabled",
+  "cdm-not-supported",
+  "cdm-not-installed",
+  "cdm-created",
+};
+
+/* Note: This dictionary and enum is only used by Gecko to convey messages
+ * to chrome JS code. It is not exposed to the web.
+ */
+
+dictionary RequestMediaKeySystemAccessNotification {
+  required DOMString keySystem;
+  required MediaKeySystemStatus status;
+};
diff --git a/crates/web-sys/webidls/available/MediaList.webidl b/crates/web-sys/webidls/available/MediaList.webidl
new file mode 100644
index 00000000..89f2f0f9
--- /dev/null
+++ b/crates/web-sys/webidls/available/MediaList.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// http://dev.w3.org/csswg/cssom/#the-medialist-interface
+
+interface MediaList {
+  // Bug 824857: no support for stringifier attributes yet.
+  //   [TreatNullAs=EmptyString]
+  // stringifier attribute DOMString        mediaText;
+
+  // Bug 824857 should remove this.
+  stringifier;
+
+  [TreatNullAs=EmptyString]
+           attribute DOMString        mediaText;
+
+  readonly attribute unsigned long    length;
+  getter DOMString?  item(unsigned long index);
+  [Throws]
+  void               deleteMedium(DOMString oldMedium);
+  [Throws]
+  void               appendMedium(DOMString newMedium);
+};
diff --git a/crates/web-sys/webidls/available/MediaQueryList.webidl b/crates/web-sys/webidls/available/MediaQueryList.webidl
new file mode 100644
index 00000000..af641a26
--- /dev/null
+++ b/crates/web-sys/webidls/available/MediaQueryList.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/cssom-view/#mediaquerylist
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface MediaQueryList : EventTarget {
+  readonly attribute DOMString media;
+  readonly attribute boolean matches;
+
+  [Throws]
+  void addListener(EventListener? listener);
+
+  [Throws]
+  void removeListener(EventListener? listener);
+
+           attribute EventHandler onchange;
+};
diff --git a/crates/web-sys/webidls/available/MediaQueryListEvent.webidl b/crates/web-sys/webidls/available/MediaQueryListEvent.webidl
new file mode 100644
index 00000000..5e53e973
--- /dev/null
+++ b/crates/web-sys/webidls/available/MediaQueryListEvent.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * https://drafts.csswg.org/cssom-view/#mediaquerylistevent
+ */
+
+[Constructor(DOMString type, optional MediaQueryListEventInit eventInitDict)]
+interface MediaQueryListEvent : Event {
+  readonly attribute DOMString media;
+  readonly attribute boolean matches;
+};
+
+dictionary MediaQueryListEventInit : EventInit {
+  DOMString media = "";
+  boolean matches = false;
+};
diff --git a/crates/web-sys/webidls/available/MediaRecorder.webidl b/crates/web-sys/webidls/available/MediaRecorder.webidl
new file mode 100644
index 00000000..65d1893e
--- /dev/null
+++ b/crates/web-sys/webidls/available/MediaRecorder.webidl
@@ -0,0 +1,59 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/dap/raw-file/default/media-stream-capture/MediaRecorder.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum RecordingState { "inactive", "recording", "paused" };
+
+[Constructor(MediaStream stream, optional MediaRecorderOptions options),
+ Constructor(AudioNode node, optional unsigned long output = 0,
+             optional MediaRecorderOptions options)]
+interface MediaRecorder : EventTarget {
+
+  readonly attribute MediaStream stream;
+
+  readonly attribute RecordingState state;
+
+  readonly attribute DOMString mimeType;
+
+  attribute EventHandler ondataavailable;
+
+  attribute EventHandler onerror;
+
+  attribute EventHandler onstart;
+
+  attribute EventHandler onstop;
+
+  attribute EventHandler onwarning;
+
+  [Throws]
+  void start(optional long timeSlice);
+
+  [Throws]
+  void stop();
+
+  [Throws]
+  void pause();
+
+  [Throws]
+  void resume();
+
+  [Throws]
+  void requestData();
+
+  static boolean isTypeSupported(DOMString type);
+};
+
+dictionary MediaRecorderOptions {
+  DOMString mimeType = ""; // Default encoding mimeType.
+  unsigned long audioBitsPerSecond;
+  unsigned long videoBitsPerSecond;
+  unsigned long bitsPerSecond;
+};
diff --git a/crates/web-sys/webidls/available/MediaRecorderErrorEvent.webidl b/crates/web-sys/webidls/available/MediaRecorderErrorEvent.webidl
new file mode 100644
index 00000000..61932972
--- /dev/null
+++ b/crates/web-sys/webidls/available/MediaRecorderErrorEvent.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/mediacapture-record/
+ *
+ * Copyright © 2017 W3C® (MIT, ERCIM, Keio, Beihang). W3C liability, trademark
+ * and document use rules apply.
+ */
+
+dictionary MediaRecorderErrorEventInit : EventInit {
+  required DOMException error;
+};
+
+[Exposed=Window,
+  Constructor(DOMString type, MediaRecorderErrorEventInit eventInitDict)]
+interface MediaRecorderErrorEvent : Event {
+  [SameObject] readonly attribute DOMException error;
+};
\ No newline at end of file
diff --git a/crates/web-sys/webidls/available/MediaSource.webidl b/crates/web-sys/webidls/available/MediaSource.webidl
new file mode 100644
index 00000000..63691e09
--- /dev/null
+++ b/crates/web-sys/webidls/available/MediaSource.webidl
@@ -0,0 +1,47 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/html-media/raw-file/default/media-source/media-source.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum MediaSourceReadyState {
+  "closed",
+  "open",
+  "ended"
+};
+
+enum MediaSourceEndOfStreamError {
+  "network",
+  "decode"
+};
+
+[Constructor, Func="mozilla::dom::MediaSource::Enabled"]
+interface MediaSource : EventTarget {
+  readonly attribute SourceBufferList sourceBuffers;
+  readonly attribute SourceBufferList activeSourceBuffers;
+  readonly attribute MediaSourceReadyState readyState;
+  [SetterThrows]
+  attribute unrestricted double duration;
+  attribute EventHandler onsourceopen;
+  attribute EventHandler onsourceended;
+  attribute EventHandler onsourceclosed;
+  [NewObject, Throws]
+  SourceBuffer addSourceBuffer(DOMString type);
+  [Throws]
+  void removeSourceBuffer(SourceBuffer sourceBuffer);
+  [Throws]
+  void endOfStream(optional MediaSourceEndOfStreamError error);
+  [Throws]
+  void setLiveSeekableRange(double start, double end);
+  [Throws]
+  void clearLiveSeekableRange();
+  static boolean isTypeSupported(DOMString type);
+  [ChromeOnly]
+  readonly attribute DOMString mozDebugReaderData;
+};
diff --git a/crates/web-sys/webidls/available/MediaStream.webidl b/crates/web-sys/webidls/available/MediaStream.webidl
new file mode 100644
index 00000000..71d24527
--- /dev/null
+++ b/crates/web-sys/webidls/available/MediaStream.webidl
@@ -0,0 +1,51 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origins of this IDL file are
+ * http://dev.w3.org/2011/webrtc/editor/getusermedia.html
+ *
+ * Copyright � 2012 W3C� (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+// These dictionaries need to be in a separate file from their
+// MediaTrackConstraints* counterparts due to a webidl compiler limitation.
+
+dictionary MediaStreamConstraints {
+    (boolean or MediaTrackConstraints) audio = false;
+    (boolean or MediaTrackConstraints) video = false;
+    boolean picture = false; // Mozilla legacy
+    boolean fake;       // For testing purpose. Generates frames of solid
+                        // colors if video is enabled, and sound of 1Khz sine
+                        // wave if audio is enabled.
+    DOMString? peerIdentity = null;
+};
+
+[Exposed=Window,
+ Constructor,
+ Constructor (MediaStream stream),
+ Constructor (sequence<MediaStreamTrack> tracks)]
+interface MediaStream : EventTarget {
+    readonly    attribute DOMString    id;
+    sequence<AudioStreamTrack> getAudioTracks ();
+    sequence<VideoStreamTrack> getVideoTracks ();
+    sequence<MediaStreamTrack> getTracks ();
+    MediaStreamTrack?          getTrackById (DOMString trackId);
+    void                       addTrack (MediaStreamTrack track);
+    void                       removeTrack (MediaStreamTrack track);
+    MediaStream                clone ();
+    readonly    attribute boolean      active;
+                attribute EventHandler onaddtrack;
+                attribute EventHandler onremovetrack;
+    readonly attribute double currentTime;
+
+    [ChromeOnly, Throws]
+    static Promise<long> countUnderlyingStreams();
+
+    // Webrtc allows the remote side to name a stream whatever it wants, and we
+    // need to surface this to content.
+    [ChromeOnly]
+    void assignId(DOMString id);
+};
diff --git a/crates/web-sys/webidls/available/MediaStreamAudioDestinationNode.webidl b/crates/web-sys/webidls/available/MediaStreamAudioDestinationNode.webidl
new file mode 100644
index 00000000..9776ab99
--- /dev/null
+++ b/crates/web-sys/webidls/available/MediaStreamAudioDestinationNode.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="dom.webaudio.enabled",
+ Constructor(AudioContext context, optional AudioNodeOptions options)]
+interface MediaStreamAudioDestinationNode : AudioNode {
+    readonly attribute MediaStream stream;
+};
diff --git a/crates/web-sys/webidls/available/MediaStreamAudioSourceNode.webidl b/crates/web-sys/webidls/available/MediaStreamAudioSourceNode.webidl
new file mode 100644
index 00000000..06727a5d
--- /dev/null
+++ b/crates/web-sys/webidls/available/MediaStreamAudioSourceNode.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary MediaStreamAudioSourceOptions {
+    required MediaStream mediaStream;
+};
+
+[Pref="dom.webaudio.enabled",
+ Constructor(AudioContext context, MediaStreamAudioSourceOptions options)]
+interface MediaStreamAudioSourceNode : AudioNode {
+
+};
+
+// Mozilla extensions
+MediaStreamAudioSourceNode implements AudioNodePassThrough;
+
diff --git a/crates/web-sys/webidls/available/MediaStreamError.webidl b/crates/web-sys/webidls/available/MediaStreamError.webidl
new file mode 100644
index 00000000..54c8f579
--- /dev/null
+++ b/crates/web-sys/webidls/available/MediaStreamError.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://w3c.github.io/mediacapture-main/getusermedia.html#idl-def-MediaStreamError
+ */
+
+// The future of MediaStreamError is uncertain.
+// https://www.w3.org/Bugs/Public/show_bug.cgi?id=26776
+
+// TODO: This is an 'exception', not an interface, by virtue of needing to be
+// passed as a promise rejection-reason. Revisit if DOMException grows a customArg
+
+[ExceptionClass, NoInterfaceObject]
+interface MediaStreamError {
+  readonly attribute DOMString  name;
+  readonly attribute DOMString? message;
+  readonly attribute DOMString? constraint;
+};
diff --git a/crates/web-sys/webidls/available/MediaStreamEvent.webidl b/crates/web-sys/webidls/available/MediaStreamEvent.webidl
new file mode 100644
index 00000000..56bac3a8
--- /dev/null
+++ b/crates/web-sys/webidls/available/MediaStreamEvent.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2011/webrtc/editor/webrtc.html#mediastreamevent
+ */
+
+dictionary MediaStreamEventInit : EventInit {
+    MediaStream? stream = null;
+};
+
+[Pref="media.peerconnection.enabled",
+ Constructor(DOMString type, optional MediaStreamEventInit eventInitDict)]
+interface MediaStreamEvent : Event {
+  readonly attribute MediaStream? stream;
+};
diff --git a/crates/web-sys/webidls/available/MediaStreamTrack.webidl b/crates/web-sys/webidls/available/MediaStreamTrack.webidl
new file mode 100644
index 00000000..09f28d84
--- /dev/null
+++ b/crates/web-sys/webidls/available/MediaStreamTrack.webidl
@@ -0,0 +1,101 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2011/webrtc/editor/getusermedia.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+// These two enums are in the spec even though they're not used directly in the
+// API due to https://www.w3.org/Bugs/Public/show_bug.cgi?id=19936
+// Their binding code is used in the implementation.
+
+enum VideoFacingModeEnum {
+    "user",
+    "environment",
+    "left",
+    "right"
+};
+
+enum MediaSourceEnum {
+    "camera",
+    "screen",
+    "application",
+    "window",
+    "browser",
+    "microphone",
+    "audioCapture",
+    "other"
+    // If values are added, adjust n_values in Histograms.json (2 places)
+};
+
+typedef (long or ConstrainLongRange) ConstrainLong;
+typedef (double or ConstrainDoubleRange) ConstrainDouble;
+typedef (boolean or ConstrainBooleanParameters) ConstrainBoolean;
+typedef (DOMString or sequence<DOMString> or ConstrainDOMStringParameters) ConstrainDOMString;
+
+// Note: When adding new constraints, remember to update the SelectSettings()
+// function in MediaManager.cpp to make OverconstrainedError's constraint work!
+
+dictionary MediaTrackConstraintSet {
+    ConstrainLong width;
+    ConstrainLong height;
+    ConstrainDouble frameRate;
+    ConstrainDOMString facingMode;
+    DOMString mediaSource = "camera";
+    long long browserWindow;
+    boolean scrollWithPage;
+    ConstrainDOMString deviceId;
+    ConstrainLong viewportOffsetX;
+    ConstrainLong viewportOffsetY;
+    ConstrainLong viewportWidth;
+    ConstrainLong viewportHeight;
+    ConstrainBoolean echoCancellation;
+    ConstrainBoolean noiseSuppression;
+    ConstrainBoolean autoGainControl;
+    ConstrainLong channelCount;
+
+    // Deprecated with warnings:
+    ConstrainBoolean mozNoiseSuppression;
+    ConstrainBoolean mozAutoGainControl;
+};
+
+dictionary MediaTrackConstraints : MediaTrackConstraintSet {
+    sequence<MediaTrackConstraintSet> advanced;
+};
+
+enum MediaStreamTrackState {
+    "live",
+    "ended"
+};
+
+[Exposed=Window]
+interface MediaStreamTrack : EventTarget {
+    readonly    attribute DOMString             kind;
+    readonly    attribute DOMString             id;
+    [NeedsCallerType]
+    readonly    attribute DOMString             label;
+                attribute boolean               enabled;
+    readonly    attribute boolean               muted;
+                attribute EventHandler          onmute;
+                attribute EventHandler          onunmute;
+    readonly    attribute MediaStreamTrackState readyState;
+                attribute EventHandler          onended;
+    MediaStreamTrack       clone ();
+    void                   stop ();
+//  MediaTrackCapabilities getCapabilities ();
+    MediaTrackConstraints  getConstraints ();
+    [NeedsCallerType]
+    MediaTrackSettings     getSettings ();
+
+    [Throws, NeedsCallerType]
+    Promise<void>          applyConstraints (optional MediaTrackConstraints constraints);
+//              attribute EventHandler          onoverconstrained;
+
+    [ChromeOnly]
+    void mutedChanged(boolean muted);
+};
diff --git a/crates/web-sys/webidls/available/MediaStreamTrackEvent.webidl b/crates/web-sys/webidls/available/MediaStreamTrackEvent.webidl
new file mode 100644
index 00000000..538adf2f
--- /dev/null
+++ b/crates/web-sys/webidls/available/MediaStreamTrackEvent.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2011/webrtc/editor/webrtc.html#mediastreamevent
+ */
+
+dictionary MediaStreamTrackEventInit : EventInit {
+    required MediaStreamTrack track;
+};
+
+[Exposed=Window,
+ Constructor (DOMString type, MediaStreamTrackEventInit eventInitDict)]
+interface MediaStreamTrackEvent : Event {
+    [SameObject]
+    readonly        attribute MediaStreamTrack track;
+};
diff --git a/crates/web-sys/webidls/available/MediaTrackConstraintSet.webidl b/crates/web-sys/webidls/available/MediaTrackConstraintSet.webidl
new file mode 100644
index 00000000..63bc6bac
--- /dev/null
+++ b/crates/web-sys/webidls/available/MediaTrackConstraintSet.webidl
@@ -0,0 +1,38 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2011/webrtc/editor/getusermedia.html
+ */
+
+// These dictionaries need to be in a separate file from their use in unions
+// in MediaSreamTrack.webidl due to a webidl compiler limitation:
+//
+// TypeError: Dictionary contains a union that contains a dictionary in the same
+// WebIDL file.  This won't compile.  Move the inner dictionary to a different file.
+
+dictionary ConstrainLongRange {
+    long min;
+    long max;
+    long exact;
+    long ideal;
+};
+
+dictionary ConstrainDoubleRange {
+    double min;
+    double max;
+    double exact;
+    double ideal;
+};
+
+dictionary ConstrainBooleanParameters {
+    boolean exact;
+    boolean ideal;
+};
+
+dictionary ConstrainDOMStringParameters {
+    (DOMString or sequence<DOMString>) exact;
+    (DOMString or sequence<DOMString>) ideal;
+};
diff --git a/crates/web-sys/webidls/available/MediaTrackSettings.webidl b/crates/web-sys/webidls/available/MediaTrackSettings.webidl
new file mode 100644
index 00000000..977e0f01
--- /dev/null
+++ b/crates/web-sys/webidls/available/MediaTrackSettings.webidl
@@ -0,0 +1,37 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://w3c.github.io/mediacapture-main/getusermedia.html
+ */
+
+dictionary MediaTrackSettings {
+    long      width;
+    long      height;
+    double    frameRate;
+    DOMString facingMode;
+    DOMString deviceId;
+    boolean echoCancellation;
+    boolean noiseSuppression;
+    boolean autoGainControl;
+    long      channelCount;
+
+    // Mozilla-specific extensions:
+
+    // http://fluffy.github.io/w3c-screen-share/#screen-based-video-constraints
+    // OBE by http://w3c.github.io/mediacapture-screen-share
+
+    DOMString mediaSource;
+
+    // Experimental https://bugzilla.mozilla.org/show_bug.cgi?id=1131568#c3
+    //              https://bugzilla.mozilla.org/show_bug.cgi?id=1193075
+
+    long long browserWindow;
+    boolean scrollWithPage;
+    long viewportOffsetX;
+    long viewportOffsetY;
+    long viewportWidth;
+    long viewportHeight;
+};
diff --git a/crates/web-sys/webidls/available/MediaTrackSupportedConstraints.webidl b/crates/web-sys/webidls/available/MediaTrackSupportedConstraints.webidl
new file mode 100644
index 00000000..ac2d4b83
--- /dev/null
+++ b/crates/web-sys/webidls/available/MediaTrackSupportedConstraints.webidl
@@ -0,0 +1,43 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2011/webrtc/editor/getusermedia.html
+ */
+
+dictionary MediaTrackSupportedConstraints {
+    boolean width = true;
+    boolean height = true;
+    boolean aspectRatio;        // to be supported
+    boolean frameRate = true;
+    boolean facingMode = true;
+    boolean volume;             // to be supported
+    boolean sampleRate;         // to be supported
+    boolean sampleSize;         // to be supported
+    boolean echoCancellation = true;
+    boolean noiseSuppression = true;
+    boolean autoGainControl = true;
+    boolean latency;            // to be supported
+    boolean channelCount = true;
+    boolean deviceId = true;
+    boolean groupId;            // to be supported
+
+    // Mozilla-specific extensions:
+
+    // http://fluffy.github.io/w3c-screen-share/#screen-based-video-constraints
+    // OBE by http://w3c.github.io/mediacapture-screen-share
+
+    boolean mediaSource = true;
+
+    // Experimental https://bugzilla.mozilla.org/show_bug.cgi?id=1131568#c3
+    //              https://bugzilla.mozilla.org/show_bug.cgi?id=1193075
+
+    boolean browserWindow = true;
+    boolean scrollWithPage = true;
+    boolean viewportOffsetX = true;
+    boolean viewportOffsetY = true;
+    boolean viewportWidth = true;
+    boolean viewportHeight = true;
+};
diff --git a/crates/web-sys/webidls/available/MenuBoxObject.webidl b/crates/web-sys/webidls/available/MenuBoxObject.webidl
new file mode 100644
index 00000000..449cadc5
--- /dev/null
+++ b/crates/web-sys/webidls/available/MenuBoxObject.webidl
@@ -0,0 +1,19 @@
+
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Func="IsChromeOrXBL"]
+interface MenuBoxObject : BoxObject {
+
+  void openMenu(boolean openFlag);
+
+  attribute Element? activeChild;
+
+  boolean handleKeyPress(KeyboardEvent keyEvent);
+
+  readonly attribute boolean openedWithKey;
+
+};
diff --git a/crates/web-sys/webidls/available/MessageChannel.webidl b/crates/web-sys/webidls/available/MessageChannel.webidl
new file mode 100644
index 00000000..1e2ca4a1
--- /dev/null
+++ b/crates/web-sys/webidls/available/MessageChannel.webidl
@@ -0,0 +1,14 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface, please see
+ * http://www.whatwg.org/specs/web-apps/current-work/#channel-messaging
+ */
+
+[Constructor, Exposed=(Window,Worker,System)]
+interface MessageChannel {
+  readonly attribute MessagePort port1;
+  readonly attribute MessagePort port2;
+};
diff --git a/crates/web-sys/webidls/available/MessageEvent.webidl b/crates/web-sys/webidls/available/MessageEvent.webidl
new file mode 100644
index 00000000..7d78c20e
--- /dev/null
+++ b/crates/web-sys/webidls/available/MessageEvent.webidl
@@ -0,0 +1,64 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface, please see
+ * https://html.spec.whatwg.org/#messageevent
+ */
+
+[Constructor(DOMString type, optional MessageEventInit eventInitDict),
+ Exposed=(Window,Worker,System)]
+interface MessageEvent : Event {
+  /**
+   * Custom data associated with this event.
+   */
+  [GetterThrows]
+  readonly attribute any data;
+
+  /**
+   * The origin of the site from which this event originated, which is the
+   * scheme, ":", and if the URI has a host, "//" followed by the
+   * host, and if the port is not the default for the given scheme,
+   * ":" followed by that port.  This value does not have a trailing slash.
+   */
+  readonly attribute USVString origin;
+
+  /**
+   * The last event ID string of the event source, for server-sent DOM events; this
+   * value is the empty string for cross-origin messaging.
+   */
+  readonly attribute DOMString lastEventId;
+
+  /**
+   * The window or port which originated this event.
+   */
+  readonly attribute MessageEventSource? source;
+
+  [Pure, Cached, Frozen]
+  readonly attribute sequence<MessagePort> ports;
+
+  /**
+   * Initializes this event with the given data, in a manner analogous to
+   * the similarly-named method on the Event interface, also setting the
+   * data, origin, source, and lastEventId attributes of this appropriately.
+   */
+  void initMessageEvent(DOMString type,
+                        optional boolean bubbles = false,
+                        optional boolean cancelable = false,
+                        optional any data = null,
+                        optional DOMString origin = "",
+                        optional DOMString lastEventId = "",
+                        optional MessageEventSource? source = null,
+                        optional sequence<MessagePort> ports = []);
+};
+
+dictionary MessageEventInit : EventInit {
+  any data = null;
+  DOMString origin = "";
+  DOMString lastEventId = "";
+  MessageEventSource? source = null;
+  sequence<MessagePort> ports = [];
+};
+
+typedef (WindowProxy or MessagePort or ServiceWorker) MessageEventSource;
diff --git a/crates/web-sys/webidls/available/MessagePort.webidl b/crates/web-sys/webidls/available/MessagePort.webidl
new file mode 100644
index 00000000..f8b3de62
--- /dev/null
+++ b/crates/web-sys/webidls/available/MessagePort.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface, please see
+ * http://www.whatwg.org/specs/web-apps/current-work/#channel-messaging
+ */
+
+[Exposed=(Window,Worker,AudioWorklet,System)]
+interface MessagePort : EventTarget {
+  [Throws]
+  void postMessage(any message, optional sequence<object> transferable = []);
+
+  void start();
+  void close();
+
+  // event handlers
+  attribute EventHandler onmessage;
+  attribute EventHandler onmessageerror;
+};
+// MessagePort implements Transferable;
diff --git a/crates/web-sys/webidls/available/MimeType.webidl b/crates/web-sys/webidls/available/MimeType.webidl
new file mode 100644
index 00000000..a33d3164
--- /dev/null
+++ b/crates/web-sys/webidls/available/MimeType.webidl
@@ -0,0 +1,12 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+interface MimeType {
+  readonly attribute DOMString description;
+  readonly attribute Plugin? enabledPlugin;
+  readonly attribute DOMString suffixes;
+  readonly attribute DOMString type;
+};
diff --git a/crates/web-sys/webidls/available/MimeTypeArray.webidl b/crates/web-sys/webidls/available/MimeTypeArray.webidl
new file mode 100644
index 00000000..ca553552
--- /dev/null
+++ b/crates/web-sys/webidls/available/MimeTypeArray.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[LegacyUnenumerableNamedProperties]
+interface MimeTypeArray {
+  [NeedsCallerType]
+  readonly attribute unsigned long length;
+
+  [NeedsCallerType]
+  getter MimeType? item(unsigned long index);
+  [NeedsCallerType]
+  getter MimeType? namedItem(DOMString name);
+};
diff --git a/crates/web-sys/webidls/available/MouseEvent.webidl b/crates/web-sys/webidls/available/MouseEvent.webidl
new file mode 100644
index 00000000..712e0b90
--- /dev/null
+++ b/crates/web-sys/webidls/available/MouseEvent.webidl
@@ -0,0 +1,115 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface please see
+ * http://dev.w3.org/2006/webapi/DOM-Level-3-Events/html/DOM3-Events.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Constructor(DOMString typeArg, optional MouseEventInit mouseEventInitDict)]
+interface MouseEvent : UIEvent {
+  [NeedsCallerType]
+  readonly attribute long           screenX;
+  [NeedsCallerType]
+  readonly attribute long           screenY;
+  readonly attribute long           clientX;
+  readonly attribute long           clientY;
+  [BinaryName="clientX"]
+  readonly attribute long           x;
+  [BinaryName="clientY"]
+  readonly attribute long           y;
+  readonly attribute long           offsetX;
+  readonly attribute long           offsetY;
+  readonly attribute boolean        ctrlKey;
+  readonly attribute boolean        shiftKey;
+  readonly attribute boolean        altKey;
+  readonly attribute boolean        metaKey;
+  readonly attribute short          button;
+  readonly attribute unsigned short buttons;
+  readonly attribute EventTarget?   relatedTarget;
+  readonly attribute DOMString?     region;
+
+  // Pointer Lock
+  readonly attribute long           movementX;
+  readonly attribute long           movementY;
+
+  // Deprecated in DOM Level 3:
+void initMouseEvent(DOMString typeArg,
+                    optional boolean canBubbleArg = false,
+                    optional boolean cancelableArg = false,
+                    optional Window? viewArg = null,
+                    optional long detailArg = 0,
+                    optional long screenXArg = 0,
+                    optional long screenYArg = 0,
+                    optional long clientXArg = 0,
+                    optional long clientYArg = 0,
+                    optional boolean ctrlKeyArg = false,
+                    optional boolean altKeyArg = false,
+                    optional boolean shiftKeyArg = false,
+                    optional boolean metaKeyArg = false,
+                    optional short buttonArg = 0,
+                    optional EventTarget? relatedTargetArg = null);
+  // Introduced in DOM Level 3:
+  boolean                           getModifierState(DOMString keyArg);
+};
+
+// Suggested initMouseEvent replacement initializer:
+dictionary MouseEventInit : EventModifierInit {
+  // Attributes for MouseEvent:
+  long           screenX       = 0;
+  long           screenY       = 0;
+  long           clientX       = 0;
+  long           clientY       = 0;
+  short          button        = 0;
+  // Note: "buttons" was not previously initializable through initMouseEvent!
+  unsigned short buttons       = 0;
+  EventTarget?   relatedTarget = null;
+
+  // Pointer Lock
+  long           movementX = 0;
+  long           movementY = 0;
+};
+
+// Mozilla extensions
+partial interface MouseEvent
+{
+  // Finger or touch pressure event value
+  // ranges between 0.0 and 1.0
+  readonly attribute float mozPressure;
+
+  const unsigned short    MOZ_SOURCE_UNKNOWN    = 0;
+  const unsigned short    MOZ_SOURCE_MOUSE      = 1;
+  const unsigned short    MOZ_SOURCE_PEN        = 2;
+  const unsigned short    MOZ_SOURCE_ERASER     = 3;
+  const unsigned short    MOZ_SOURCE_CURSOR     = 4;
+  const unsigned short    MOZ_SOURCE_TOUCH      = 5;
+  const unsigned short    MOZ_SOURCE_KEYBOARD   = 6;
+
+  readonly attribute unsigned short mozInputSource;
+
+  void initNSMouseEvent(DOMString typeArg,
+                        optional boolean canBubbleArg = false,
+                        optional boolean cancelableArg = false,
+                        optional Window? viewArg = null,
+                        optional long detailArg = 0,
+                        optional long screenXArg = 0,
+                        optional long screenYArg = 0,
+                        optional long clientXArg = 0,
+                        optional long clientYArg = 0,
+                        optional boolean ctrlKeyArg = false,
+                        optional boolean altKeyArg = false,
+                        optional boolean shiftKeyArg = false,
+                        optional boolean metaKeyArg = false,
+                        optional short buttonArg = 0,
+                        optional EventTarget? relatedTargetArg = null,
+                        optional float pressure = 0,
+                        optional unsigned short inputSourceArg = 0);
+  [ChromeOnly]
+  readonly attribute boolean hitCluster; // True when touch occurs in a cluster of links
+
+};
+
diff --git a/crates/web-sys/webidls/available/MouseScrollEvent.webidl b/crates/web-sys/webidls/available/MouseScrollEvent.webidl
new file mode 100644
index 00000000..c1e52bd8
--- /dev/null
+++ b/crates/web-sys/webidls/available/MouseScrollEvent.webidl
@@ -0,0 +1,30 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+interface MouseScrollEvent : MouseEvent
+{
+  const long HORIZONTAL_AXIS = 1;
+  const long VERTICAL_AXIS = 2;
+
+  readonly attribute long axis;
+
+  void initMouseScrollEvent(DOMString type,
+                            optional boolean canBubble = false,
+                            optional boolean cancelable = false,
+                            optional Window? view = null,
+                            optional long detail = 0,
+                            optional long screenX = 0,
+                            optional long screenY = 0,
+                            optional long clientX = 0,
+                            optional long clientY = 0,
+                            optional boolean ctrlKey = false,
+                            optional boolean altKey = false,
+                            optional boolean shiftKey = false,
+                            optional boolean metaKey = false,
+                            optional short button = 0,
+                            optional EventTarget? relatedTarget = null,
+                            optional long axis = 0);
+};
diff --git a/crates/web-sys/webidls/available/MozApplicationEvent.webidl b/crates/web-sys/webidls/available/MozApplicationEvent.webidl
new file mode 100644
index 00000000..e46fdca0
--- /dev/null
+++ b/crates/web-sys/webidls/available/MozApplicationEvent.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Constructor(DOMString type, optional MozApplicationEventInit eventInitDict), ChromeOnly]
+interface MozApplicationEvent : Event
+{
+  readonly attribute DOMApplication? application;
+};
+
+dictionary MozApplicationEventInit : EventInit
+{
+  DOMApplication? application = null;
+};
diff --git a/crates/web-sys/webidls/available/MutationEvent.webidl b/crates/web-sys/webidls/available/MutationEvent.webidl
new file mode 100644
index 00000000..85ad597f
--- /dev/null
+++ b/crates/web-sys/webidls/available/MutationEvent.webidl
@@ -0,0 +1,35 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2006/webapi/DOM-Level-3-Events/html/DOM3-Events.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+interface MutationEvent : Event
+{
+  const unsigned short MODIFICATION = 1;
+  const unsigned short ADDITION     = 2;
+  const unsigned short REMOVAL      = 3;
+  [ChromeOnly]
+  const unsigned short SMIL         = 4;
+
+  readonly attribute Node?          relatedNode;
+  readonly attribute DOMString      prevValue;
+  readonly attribute DOMString      newValue;
+  readonly attribute DOMString      attrName;
+  readonly attribute unsigned short attrChange;
+
+  [Throws]
+  void initMutationEvent(DOMString type,
+                         optional boolean canBubble = false,
+                         optional boolean cancelable = false,
+                         optional Node? relatedNode = null,
+                         optional DOMString prevValue = "",
+                         optional DOMString newValue = "",
+                         optional DOMString attrName = "",
+                         optional unsigned short attrChange = 0);
+};
diff --git a/crates/web-sys/webidls/available/MutationObserver.webidl b/crates/web-sys/webidls/available/MutationObserver.webidl
new file mode 100644
index 00000000..c179a645
--- /dev/null
+++ b/crates/web-sys/webidls/available/MutationObserver.webidl
@@ -0,0 +1,74 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dom.spec.whatwg.org
+ */
+
+[ProbablyShortLivingWrapper]
+interface MutationRecord {
+  [Constant]
+  readonly attribute DOMString type;
+  // .target is not nullable per the spec, but in order to prevent crashes,
+  // if there are GC/CC bugs in Gecko, we let the property to be null.
+  [Constant]
+  readonly attribute Node? target;
+  [Constant]
+  readonly attribute NodeList addedNodes;
+  [Constant]
+  readonly attribute NodeList removedNodes;
+  [Constant]
+  readonly attribute Node? previousSibling;
+  [Constant]
+  readonly attribute Node? nextSibling;
+  [Constant]
+  readonly attribute DOMString? attributeName;
+  [Constant]
+  readonly attribute DOMString? attributeNamespace;
+  [Constant]
+  readonly attribute DOMString? oldValue;
+  [Constant,Cached,ChromeOnly]
+  readonly attribute sequence<Animation> addedAnimations;
+  [Constant,Cached,ChromeOnly]
+  readonly attribute sequence<Animation> changedAnimations;
+  [Constant,Cached,ChromeOnly]
+  readonly attribute sequence<Animation> removedAnimations;
+};
+
+[Constructor(MutationCallback mutationCallback)]
+interface MutationObserver {
+  [Throws]
+  void observe(Node target, optional MutationObserverInit options);
+  void disconnect();
+  sequence<MutationRecord> takeRecords();
+
+  [ChromeOnly, Throws]
+  sequence<MutationObservingInfo?> getObservingInfo();
+  [ChromeOnly]
+  readonly attribute MutationCallback mutationCallback;
+  [ChromeOnly]
+  attribute boolean mergeAttributeRecords;
+};
+
+callback MutationCallback = void (sequence<MutationRecord> mutations, MutationObserver observer);
+
+dictionary MutationObserverInit {
+  boolean childList = false;
+  boolean attributes;
+  boolean characterData;
+  boolean subtree = false;
+  boolean attributeOldValue;
+  boolean characterDataOldValue;
+  [ChromeOnly]
+  boolean nativeAnonymousChildList = false;
+  [ChromeOnly]
+  boolean animations = false;
+  sequence<DOMString> attributeFilter;
+};
+
+dictionary MutationObservingInfo : MutationObserverInit
+{
+  Node? observedNode = null;
+};
diff --git a/crates/web-sys/webidls/available/NamedNodeMap.webidl b/crates/web-sys/webidls/available/NamedNodeMap.webidl
new file mode 100644
index 00000000..88e2ff51
--- /dev/null
+++ b/crates/web-sys/webidls/available/NamedNodeMap.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+[LegacyUnenumerableNamedProperties]
+interface NamedNodeMap {
+  getter Attr? getNamedItem(DOMString name);
+  [CEReactions, Throws, BinaryName="setNamedItemNS"]
+  Attr? setNamedItem(Attr arg);
+  [CEReactions, Throws]
+  Attr removeNamedItem(DOMString name);
+
+  getter Attr? item(unsigned long index);
+  readonly attribute unsigned long length;
+
+  Attr? getNamedItemNS(DOMString? namespaceURI, DOMString localName);
+  [CEReactions, Throws]
+  Attr? setNamedItemNS(Attr arg);
+  [CEReactions, Throws]
+  Attr removeNamedItemNS(DOMString? namespaceURI, DOMString localName);
+};
diff --git a/crates/web-sys/webidls/available/NativeOSFileInternals.webidl b/crates/web-sys/webidls/available/NativeOSFileInternals.webidl
new file mode 100644
index 00000000..934b6ae1
--- /dev/null
+++ b/crates/web-sys/webidls/available/NativeOSFileInternals.webidl
@@ -0,0 +1,58 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtaone at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * Options for nsINativeOSFileInternals::Read
+ */
+dictionary NativeOSFileReadOptions
+{
+  /**
+   * If specified, convert the raw bytes to a String
+   * with the specified encoding. Otherwise, return
+   * the raw bytes as a TypedArray.
+   */
+  DOMString? encoding;
+
+  /**
+   * If specified, limit the number of bytes to read.
+   */
+  unsigned long long? bytes;
+};
+
+/**
+ * Options for nsINativeOSFileInternals::WriteAtomic
+ */
+dictionary NativeOSFileWriteAtomicOptions
+{
+  /**
+   * If specified, specify the number of bytes to write.
+   * NOTE: This takes (and should take) a uint64 here but the actual
+   * value is limited to int32. This needs to be fixed, see Bug 1063635.
+   */
+  unsigned long long? bytes;
+
+  /**
+   * If specified, write all data to a temporary file in the
+   * |tmpPath|. Else, write to the given path directly.
+   */
+  DOMString? tmpPath = null;
+
+  /**
+   * If specified and true, a failure will occur if the file
+   * already exists in the given path.
+   */
+  boolean noOverwrite = false;
+
+  /**
+   * If specified and true, this will sync any buffered data
+   * for the file to disk. This might be slower, but safer.
+   */
+  boolean flush = false;
+
+  /**
+   * If specified, this will backup the destination file as
+   * specified.
+   */
+  DOMString? backupTo = null;
+};
diff --git a/crates/web-sys/webidls/available/Navigator.webidl b/crates/web-sys/webidls/available/Navigator.webidl
new file mode 100644
index 00000000..6546609e
--- /dev/null
+++ b/crates/web-sys/webidls/available/Navigator.webidl
@@ -0,0 +1,333 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-navigator-object
+ * http://www.w3.org/TR/tracking-dnt/
+ * http://www.w3.org/TR/geolocation-API/#geolocation_interface
+ * http://www.w3.org/TR/battery-status/#navigatorbattery-interface
+ * http://www.w3.org/TR/vibration/#vibration-interface
+ * http://www.w3.org/2012/sysapps/runtime/#extension-to-the-navigator-interface-1
+ * https://dvcs.w3.org/hg/gamepad/raw-file/default/gamepad.html#navigator-interface-extension
+ * http://www.w3.org/TR/beacon/#sec-beacon-method
+ * https://html.spec.whatwg.org/#navigatorconcurrenthardware
+ * http://wicg.github.io/netinfo/#extensions-to-the-navigator-interface
+ * https://w3c.github.io/webappsec-credential-management/#framework-credential-management
+ * https://w3c.github.io/webdriver/webdriver-spec.html#interface
+ * https://wicg.github.io/media-capabilities/#idl-index
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-navigator-object
+[HeaderFile="Navigator.h"]
+interface Navigator {
+  // objects implementing this interface also implement the interfaces given below
+};
+Navigator implements NavigatorID;
+Navigator implements NavigatorLanguage;
+Navigator implements NavigatorOnLine;
+Navigator implements NavigatorContentUtils;
+Navigator implements NavigatorStorageUtils;
+Navigator implements NavigatorConcurrentHardware;
+Navigator implements NavigatorStorage;
+Navigator implements NavigatorAutomationInformation;
+
+[NoInterfaceObject, Exposed=(Window,Worker)]
+interface NavigatorID {
+  // WebKit/Blink/Trident/Presto support this (hardcoded "Mozilla").
+  [Constant, Cached, Throws]
+  readonly attribute DOMString appCodeName; // constant "Mozilla"
+  [Constant, Cached, NeedsCallerType]
+  readonly attribute DOMString appName;
+  [Constant, Cached, Throws, NeedsCallerType]
+  readonly attribute DOMString appVersion;
+  [Constant, Cached, Throws, NeedsCallerType]
+  readonly attribute DOMString platform;
+  [Pure, Cached, Throws, NeedsCallerType]
+  readonly attribute DOMString userAgent;
+  [Constant, Cached]
+  readonly attribute DOMString product; // constant "Gecko"
+
+  // Everyone but WebKit/Blink supports this.  See bug 679971.
+  [Exposed=Window]
+  boolean taintEnabled(); // constant false
+};
+
+[NoInterfaceObject, Exposed=(Window,Worker)]
+interface NavigatorLanguage {
+
+  // These two attributes are cached because this interface is also implemented
+  // by Workernavigator and this way we don't have to go back to the
+  // main-thread from the worker thread anytime we need to retrieve them. They
+  // are updated when pref intl.accept_languages is changed.
+
+  [Pure, Cached]
+  readonly attribute DOMString? language;
+  [Pure, Cached, Frozen]
+  readonly attribute sequence<DOMString> languages;
+};
+
+[NoInterfaceObject, Exposed=(Window,Worker)]
+interface NavigatorOnLine {
+  readonly attribute boolean onLine;
+};
+
+[NoInterfaceObject]
+interface NavigatorContentUtils {
+  // content handler registration
+  [Throws, Func="nsGlobalWindowInner::RegisterProtocolHandlerAllowedForContext"]
+  void registerProtocolHandler(DOMString scheme, DOMString url, DOMString title);
+  [Pref="dom.registerContentHandler.enabled", Throws]
+  void registerContentHandler(DOMString mimeType, DOMString url, DOMString title);
+  // NOT IMPLEMENTED
+  //DOMString isProtocolHandlerRegistered(DOMString scheme, DOMString url);
+  //DOMString isContentHandlerRegistered(DOMString mimeType, DOMString url);
+  //void unregisterProtocolHandler(DOMString scheme, DOMString url);
+  //void unregisterContentHandler(DOMString mimeType, DOMString url);
+};
+
+[SecureContext, NoInterfaceObject, Exposed=(Window,Worker)]
+interface NavigatorStorage {
+  [Func="mozilla::dom::DOMPrefs::StorageManagerEnabled"]
+  readonly attribute StorageManager storage;
+};
+
+[NoInterfaceObject]
+interface NavigatorStorageUtils {
+  // NOT IMPLEMENTED
+  //void yieldForStorageUpdates();
+};
+
+partial interface Navigator {
+  [Throws]
+  readonly attribute Permissions permissions;
+};
+
+// Things that definitely need to be in the spec and and are not for some
+// reason.  See https://www.w3.org/Bugs/Public/show_bug.cgi?id=22406
+partial interface Navigator {
+  [Throws]
+  readonly attribute MimeTypeArray mimeTypes;
+  [Throws]
+  readonly attribute PluginArray plugins;
+};
+
+// http://www.w3.org/TR/tracking-dnt/ sort of
+partial interface Navigator {
+  readonly attribute DOMString doNotTrack;
+};
+
+// http://www.w3.org/TR/geolocation-API/#geolocation_interface
+[NoInterfaceObject]
+interface NavigatorGeolocation {
+  [Throws, Pref="geo.enabled"]
+  readonly attribute Geolocation geolocation;
+};
+Navigator implements NavigatorGeolocation;
+
+// http://www.w3.org/TR/battery-status/#navigatorbattery-interface
+partial interface Navigator {
+  // ChromeOnly to prevent web content from fingerprinting users' batteries.
+  [Throws, ChromeOnly, Pref="dom.battery.enabled"]
+  Promise<BatteryManager> getBattery();
+};
+
+// http://www.w3.org/TR/vibration/#vibration-interface
+partial interface Navigator {
+    // We don't support sequences in unions yet
+    //boolean vibrate ((unsigned long or sequence<unsigned long>) pattern);
+    boolean vibrate(unsigned long duration);
+    boolean vibrate(sequence<unsigned long> pattern);
+};
+
+// http://www.w3.org/TR/pointerevents/#extensions-to-the-navigator-interface
+partial interface Navigator {
+    [Pref="dom.w3c_pointer_events.enabled"]
+    readonly attribute long maxTouchPoints;
+};
+
+// https://wicg.github.io/media-capabilities/#idl-index
+[Exposed=Window]
+partial interface Navigator {
+  [SameObject, Func="mozilla::dom::MediaCapabilities::Enabled"]
+  readonly attribute MediaCapabilities mediaCapabilities;
+};
+
+// Mozilla-specific extensions
+
+// Chrome-only interface for Vibration API permission handling.
+partial interface Navigator {
+    /* Set permission state to device vibration.
+     * @param permitted permission state (true for allowing vibration)
+     * @param persistent make the permission session-persistent
+     */
+    [ChromeOnly]
+    void setVibrationPermission(boolean permitted,
+                                optional boolean persistent = true);
+};
+
+callback interface MozIdleObserver {
+  // Time is in seconds and is read only when idle observers are added
+  // and removed.
+  readonly attribute unsigned long time;
+  void onidle();
+  void onactive();
+};
+
+partial interface Navigator {
+  [Throws, Constant, Cached, NeedsCallerType]
+  readonly attribute DOMString oscpu;
+  // WebKit/Blink support this; Trident/Presto do not.
+  readonly attribute DOMString vendor;
+  // WebKit/Blink supports this (hardcoded ""); Trident/Presto do not.
+  readonly attribute DOMString vendorSub;
+  // WebKit/Blink supports this (hardcoded "20030107"); Trident/Presto don't
+  readonly attribute DOMString productSub;
+  // WebKit/Blink/Trident/Presto support this.
+  readonly attribute boolean cookieEnabled;
+  [Throws, Constant, Cached, NeedsCallerType]
+  readonly attribute DOMString buildID;
+
+  // WebKit/Blink/Trident/Presto support this.
+  [Affects=Nothing, DependsOn=Nothing]
+  boolean javaEnabled();
+
+  /**
+   * Navigator requests to add an idle observer to the existing window.
+   */
+  [Throws, ChromeOnly]
+  void addIdleObserver(MozIdleObserver aIdleObserver);
+
+  /**
+   * Navigator requests to remove an idle observer from the existing window.
+   */
+  [Throws, ChromeOnly]
+  void removeIdleObserver(MozIdleObserver aIdleObserver);
+};
+
+// NetworkInformation
+partial interface Navigator {
+  [Throws, Pref="dom.netinfo.enabled"]
+  readonly attribute NetworkInformation connection;
+};
+
+// https://dvcs.w3.org/hg/gamepad/raw-file/default/gamepad.html#navigator-interface-extension
+partial interface Navigator {
+  [Throws, Pref="dom.gamepad.enabled"]
+  sequence<Gamepad?> getGamepads();
+};
+partial interface Navigator {
+  [Pref="dom.gamepad.test.enabled"]
+  GamepadServiceTest requestGamepadServiceTest();
+};
+
+partial interface Navigator {
+  [Throws, Pref="dom.vr.enabled"]
+  Promise<sequence<VRDisplay>> getVRDisplays();
+  // TODO: Use FrozenArray once available. (Bug 1236777)
+  [Frozen, Cached, Pure, Pref="dom.vr.enabled"]
+  readonly attribute sequence<VRDisplay> activeVRDisplays;
+  [ChromeOnly, Pref="dom.vr.enabled"]
+  readonly attribute boolean isWebVRContentDetected;
+  [ChromeOnly, Pref="dom.vr.enabled"]
+  readonly attribute boolean isWebVRContentPresenting;
+  [ChromeOnly, Pref="dom.vr.enabled"]
+  void requestVRPresentation(VRDisplay display);
+};
+partial interface Navigator {
+  [Pref="dom.vr.test.enabled"]
+  VRServiceTest requestVRServiceTest();
+};
+
+// http://webaudio.github.io/web-midi-api/#requestmidiaccess
+partial interface Navigator {
+  [Throws, Pref="dom.webmidi.enabled"]
+  Promise<MIDIAccess> requestMIDIAccess(optional MIDIOptions options);
+};
+
+callback NavigatorUserMediaSuccessCallback = void (MediaStream stream);
+callback NavigatorUserMediaErrorCallback = void (MediaStreamError error);
+
+partial interface Navigator {
+  [Throws, Func="Navigator::HasUserMediaSupport"]
+  readonly attribute MediaDevices mediaDevices;
+
+  // Deprecated. Use mediaDevices.getUserMedia instead.
+  [Deprecated="NavigatorGetUserMedia", Throws,
+   Func="Navigator::HasUserMediaSupport",
+   NeedsCallerType]
+  void mozGetUserMedia(MediaStreamConstraints constraints,
+                       NavigatorUserMediaSuccessCallback successCallback,
+                       NavigatorUserMediaErrorCallback errorCallback);
+};
+
+// nsINavigatorUserMedia
+callback MozGetUserMediaDevicesSuccessCallback = void (nsIVariant? devices);
+partial interface Navigator {
+  [Throws, ChromeOnly]
+  void mozGetUserMediaDevices(MediaStreamConstraints constraints,
+                              MozGetUserMediaDevicesSuccessCallback onsuccess,
+                              NavigatorUserMediaErrorCallback onerror,
+                              // The originating innerWindowID is needed to
+                              // avoid calling the callbacks if the window has
+                              // navigated away. It is optional only as legacy.
+                              optional unsigned long long innerWindowID = 0,
+                              // The callID is needed in case of multiple
+                              // concurrent requests to find the right one.
+                              // It is optional only as legacy.
+                              // TODO: Rewrite to not need this method anymore,
+                              // now that devices are enumerated earlier.
+                              optional DOMString callID = "");
+};
+
+// Service Workers/Navigation Controllers
+partial interface Navigator {
+  [Func="ServiceWorkerContainer::IsEnabled", SameObject]
+  readonly attribute ServiceWorkerContainer serviceWorker;
+};
+
+partial interface Navigator {
+  [Throws, Pref="beacon.enabled"]
+  boolean sendBeacon(DOMString url,
+                     optional BodyInit? data = null);
+};
+
+partial interface Navigator {
+  [Throws, Pref="dom.presentation.enabled", SameObject]
+  readonly attribute Presentation? presentation;
+};
+
+partial interface Navigator {
+  [NewObject, Func="mozilla::dom::TCPSocket::ShouldTCPSocketExist"]
+  readonly attribute LegacyMozTCPSocket mozTCPSocket;
+};
+
+partial interface Navigator {
+  [NewObject]
+  Promise<MediaKeySystemAccess>
+  requestMediaKeySystemAccess(DOMString keySystem,
+                              sequence<MediaKeySystemConfiguration> supportedConfigurations);
+};
+
+[NoInterfaceObject, Exposed=(Window,Worker)]
+interface NavigatorConcurrentHardware {
+  readonly attribute unsigned long long hardwareConcurrency;
+};
+
+// https://w3c.github.io/webappsec-credential-management/#framework-credential-management
+partial interface Navigator {
+  [Pref="security.webauth.webauthn", SecureContext, SameObject]
+  readonly attribute CredentialsContainer credentials;
+};
+
+// https://w3c.github.io/webdriver/webdriver-spec.html#interface
+[NoInterfaceObject]
+interface NavigatorAutomationInformation {
+  [Pref="dom.webdriver.enabled"]
+  readonly attribute boolean webdriver;
+};
diff --git a/crates/web-sys/webidls/available/NetDashboard.webidl b/crates/web-sys/webidls/available/NetDashboard.webidl
new file mode 100644
index 00000000..0d9128a6
--- /dev/null
+++ b/crates/web-sys/webidls/available/NetDashboard.webidl
@@ -0,0 +1,96 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// This file defines dictionaries used by about:networking page.
+
+dictionary SocketElement {
+  DOMString host = "";
+  unsigned long port = 0;
+  boolean active = false;
+  boolean tcp = false;
+  double sent = 0;
+  double received = 0;
+};
+
+dictionary SocketsDict {
+  sequence<SocketElement> sockets;
+  double sent = 0;
+  double received = 0;
+};
+
+dictionary HttpConnInfo {
+  unsigned long rtt = 0;
+  unsigned long ttl = 0;
+  DOMString protocolVersion = "";
+};
+
+dictionary HalfOpenInfoDict {
+  boolean speculative = false;
+};
+
+dictionary HttpConnectionElement {
+  DOMString host = "";
+  unsigned long port = 0;
+  boolean spdy = false;
+  boolean ssl = false;
+  sequence<HttpConnInfo> active;
+  sequence<HttpConnInfo> idle;
+  sequence<HalfOpenInfoDict> halfOpens;
+};
+
+dictionary HttpConnDict {
+  sequence<HttpConnectionElement> connections;
+};
+
+dictionary WebSocketElement {
+  DOMString hostport = "";
+  unsigned long msgsent = 0;
+  unsigned long msgreceived = 0;
+  double sentsize = 0;
+  double receivedsize = 0;
+  boolean encrypted = false;
+};
+
+dictionary WebSocketDict {
+  sequence<WebSocketElement> websockets;
+};
+
+dictionary DnsCacheEntry {
+  DOMString hostname = "";
+  sequence<DOMString> hostaddr;
+  DOMString family = "";
+  double expiration = 0;
+  boolean trr = false;
+};
+
+dictionary DNSCacheDict {
+  sequence<DnsCacheEntry> entries;
+};
+
+dictionary DNSLookupDict {
+  sequence<DOMString> address;
+  DOMString error = "";
+  boolean answer = false;
+};
+
+dictionary ConnStatusDict {
+  DOMString status = "";
+};
+
+dictionary RcwnPerfStats {
+  unsigned long avgShort = 0;
+  unsigned long avgLong = 0;
+  unsigned long stddevLong = 0;
+};
+
+dictionary RcwnStatus {
+  unsigned long totalNetworkRequests = 0;
+  unsigned long rcwnCacheWonCount = 0;
+  unsigned long rcwnNetWonCount = 0;
+  unsigned long cacheSlowCount = 0;
+  unsigned long cacheNotSlowCount = 0;
+  // Sequence is indexed by CachePerfStats::EDataType
+  sequence<RcwnPerfStats> perfStats;
+};
diff --git a/crates/web-sys/webidls/available/NetworkInformation.webidl b/crates/web-sys/webidls/available/NetworkInformation.webidl
new file mode 100644
index 00000000..f1120b9a
--- /dev/null
+++ b/crates/web-sys/webidls/available/NetworkInformation.webidl
@@ -0,0 +1,26 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is https://w3c.github.io/netinfo/
+ *
+ * Copyright © 2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum ConnectionType {
+    "cellular",
+    "bluetooth",
+    "ethernet",
+    "wifi",
+    "other",
+    "none",
+    "unknown"
+};
+
+[Func="mozilla::dom::DOMPrefs::NetworkInformationEnabled",
+ Exposed=(Window,Worker)]
+interface NetworkInformation : EventTarget {
+    readonly    attribute ConnectionType type;
+                attribute EventHandler   ontypechange;
+};
diff --git a/crates/web-sys/webidls/available/NetworkOptions.webidl b/crates/web-sys/webidls/available/NetworkOptions.webidl
new file mode 100644
index 00000000..b313c932
--- /dev/null
+++ b/crates/web-sys/webidls/available/NetworkOptions.webidl
@@ -0,0 +1,109 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+* License, v. 2.0. If a copy of the MPL was not distributed with this file,
+* You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+* This dictionary holds the parameters sent to the network worker.
+*/
+dictionary NetworkCommandOptions
+{
+  long id = 0;                        // opaque id.
+  DOMString cmd = "";                 // the command name.
+  DOMString ifname;                   // for "removeNetworkRoute", "setDNS",
+                                      //     "setDefaultRouteAndDNS", "removeDefaultRoute"
+                                      //     "addHostRoute", "removeHostRoute"
+                                      //     "removeHostRoutes".
+  DOMString ip;                       // for "removeNetworkRoute", "setWifiTethering".
+  unsigned long prefixLength;         // for "removeNetworkRoute".
+  DOMString domain;                   // for "setDNS"
+  sequence<DOMString> dnses;          // for "setDNS", "setDefaultRouteAndDNS".
+  DOMString gateway;                  // for "addSecondaryRoute", "removeSecondaryRoute".
+  sequence<DOMString> gateways;       // for "setDefaultRouteAndDNS", "removeDefaultRoute".
+  DOMString mode;                     // for "setWifiOperationMode".
+  boolean report;                     // for "setWifiOperationMode".
+  boolean enabled;                    // for "setDhcpServer".
+  DOMString wifictrlinterfacename;    // for "setWifiTethering".
+  DOMString internalIfname;           // for "setWifiTethering".
+  DOMString externalIfname;           // for "setWifiTethering".
+  boolean enable;                     // for "setWifiTethering".
+  DOMString ssid;                     // for "setWifiTethering".
+  DOMString security;                 // for "setWifiTethering".
+  DOMString key;                      // for "setWifiTethering".
+  DOMString prefix;                   // for "setWifiTethering", "setDhcpServer".
+  DOMString link;                     // for "setWifiTethering", "setDhcpServer".
+  sequence<DOMString> interfaceList;  // for "setWifiTethering".
+  DOMString wifiStartIp;              // for "setWifiTethering".
+  DOMString wifiEndIp;                // for "setWifiTethering".
+  DOMString usbStartIp;               // for "setWifiTethering".
+  DOMString usbEndIp;                 // for "setWifiTethering".
+  DOMString dns1;                     // for "setWifiTethering".
+  DOMString dns2;                     // for "setWifiTethering".
+  long long threshold;                // for "setNetworkInterfaceAlarm",
+                                      //     "enableNetworkInterfaceAlarm".
+  DOMString startIp;                  // for "setDhcpServer".
+  DOMString endIp;                    // for "setDhcpServer".
+  DOMString serverIp;                 // for "setDhcpServer".
+  DOMString maskLength;               // for "setDhcpServer".
+  DOMString preInternalIfname;        // for "updateUpStream".
+  DOMString preExternalIfname;        // for "updateUpStream".
+  DOMString curInternalIfname;        // for "updateUpStream".
+  DOMString curExternalIfname;        // for "updateUpStream".
+
+  long ipaddr;                        // for "ifc_configure".
+  long mask;                          // for "ifc_configure".
+  long gateway_long;                  // for "ifc_configure".
+  long dns1_long;                     // for "ifc_configure".
+  long dns2_long;                     // for "ifc_configure".
+
+  long mtu;                           // for "setMtu".
+};
+
+/**
+* This dictionary holds the parameters sent back to NetworkService.js.
+*/
+dictionary NetworkResultOptions
+{
+  long id = 0;                        // opaque id.
+  boolean ret = false;                // for sync command.
+  boolean broadcast = false;          // for netd broadcast message.
+  DOMString topic = "";               // for netd broadcast message.
+  DOMString reason = "";              // for netd broadcast message.
+
+  long resultCode = 0;                // for all commands.
+  DOMString resultReason = "";        // for all commands.
+  boolean error = false;              // for all commands.
+
+  boolean enable = false;             // for "setWifiTethering", "setUSBTethering"
+                                      //     "enableUsbRndis".
+  boolean result = false;             // for "enableUsbRndis".
+  boolean success = false;            // for "setDhcpServer".
+  DOMString curExternalIfname = "";   // for "updateUpStream".
+  DOMString curInternalIfname = "";   // for "updateUpStream".
+
+  DOMString reply = "";               // for "command".
+  DOMString route = "";               // for "ifc_get_default_route".
+  DOMString ipaddr_str = "";          // The following are for the result of
+                                      // dhcp_do_request.
+  DOMString gateway_str = "";
+  DOMString dns1_str = "";
+  DOMString dns2_str = "";
+  DOMString mask_str = "";
+  DOMString server_str = "";
+  DOMString vendor_str = "";
+  long      lease = 0;
+  long      prefixLength = 0;
+  long      mask = 0;
+  long      ipaddr = 0;
+  long      gateway = 0;
+  long      dns1 = 0;
+  long      dns2 = 0;
+  long      server = 0;
+
+  DOMString netId = "";               // for "getNetId".
+
+  sequence<DOMString> interfaceList;  // for "getInterfaceList".
+
+  DOMString flag = "down";            // for "getInterfaceConfig".
+  DOMString macAddr = "";             // for "getInterfaceConfig".
+  DOMString ipAddr = "";              // for "getInterfaceConfig".
+};
diff --git a/crates/web-sys/webidls/available/Node.webidl b/crates/web-sys/webidls/available/Node.webidl
new file mode 100644
index 00000000..db3ded8c
--- /dev/null
+++ b/crates/web-sys/webidls/available/Node.webidl
@@ -0,0 +1,218 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/2012/WD-dom-20120105/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface Principal;
+interface URI;
+
+interface Node : EventTarget {
+  const unsigned short ELEMENT_NODE = 1;
+  const unsigned short ATTRIBUTE_NODE = 2; // historical
+  const unsigned short TEXT_NODE = 3;
+  const unsigned short CDATA_SECTION_NODE = 4; // historical
+  const unsigned short ENTITY_REFERENCE_NODE = 5; // historical
+  const unsigned short ENTITY_NODE = 6; // historical
+  const unsigned short PROCESSING_INSTRUCTION_NODE = 7;
+  const unsigned short COMMENT_NODE = 8;
+  const unsigned short DOCUMENT_NODE = 9;
+  const unsigned short DOCUMENT_TYPE_NODE = 10;
+  const unsigned short DOCUMENT_FRAGMENT_NODE = 11;
+  const unsigned short NOTATION_NODE = 12; // historical
+  [Constant]
+  readonly attribute unsigned short nodeType;
+  [Pure]
+  readonly attribute DOMString nodeName;
+
+  [Pure, Throws, NeedsCallerType, BinaryName="baseURIFromJS"]
+  readonly attribute DOMString? baseURI;
+
+  [Pure, BinaryName=getComposedDoc]
+  readonly attribute boolean isConnected;
+  [Pure]
+  readonly attribute Document? ownerDocument;
+  [Pure]
+  Node getRootNode(optional GetRootNodeOptions options);
+  [Pure]
+  readonly attribute Node? parentNode;
+  [Pure]
+  readonly attribute Element? parentElement;
+  [Pure]
+  boolean hasChildNodes();
+  [SameObject]
+  readonly attribute NodeList childNodes;
+  [Pure]
+  readonly attribute Node? firstChild;
+  [Pure]
+  readonly attribute Node? lastChild;
+  [Pure]
+  readonly attribute Node? previousSibling;
+  [Pure]
+  readonly attribute Node? nextSibling;
+
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString? nodeValue;
+  [CEReactions, SetterThrows, GetterCanOOM,
+   SetterNeedsSubjectPrincipal=NonSystem, Pure]
+           attribute DOMString? textContent;
+  [CEReactions, Throws]
+  Node insertBefore(Node node, Node? child);
+  [CEReactions, Throws]
+  Node appendChild(Node node);
+  [CEReactions, Throws]
+  Node replaceChild(Node node, Node child);
+  [CEReactions, Throws]
+  Node removeChild(Node child);
+  [CEReactions]
+  void normalize();
+
+  [CEReactions, Throws]
+  Node cloneNode(optional boolean deep = false);
+  [Pure]
+  boolean isSameNode(Node? node);
+  [Pure]
+  boolean isEqualNode(Node? node);
+
+  const unsigned short DOCUMENT_POSITION_DISCONNECTED = 0x01;
+  const unsigned short DOCUMENT_POSITION_PRECEDING = 0x02;
+  const unsigned short DOCUMENT_POSITION_FOLLOWING = 0x04;
+  const unsigned short DOCUMENT_POSITION_CONTAINS = 0x08;
+  const unsigned short DOCUMENT_POSITION_CONTAINED_BY = 0x10;
+  const unsigned short DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC = 0x20; // historical
+  [Pure]
+  unsigned short compareDocumentPosition(Node other);
+  [Pure]
+  boolean contains(Node? other);
+
+  [Pure]
+  DOMString? lookupPrefix(DOMString? namespace);
+  [Pure]
+  DOMString? lookupNamespaceURI(DOMString? prefix);
+  [Pure]
+  boolean isDefaultNamespace(DOMString? namespace);
+
+  // Mozilla-specific stuff
+  [ChromeOnly]
+  readonly attribute Principal nodePrincipal;
+  [ChromeOnly]
+  readonly attribute URI? baseURIObject;
+  [ChromeOnly]
+  DOMString generateXPath();
+
+  /**
+   * This method provides a fast-path for the Fluent localization system to
+   * bypass the slowdowns in performance during initial document translation.
+   * The slowdowns are specific to XBL+Stylo.
+   * To learn more, see bug 1441037.
+   *
+   * The API is designed to fit into the DOMLocalization flow with minimal
+   * overhead, which dictates much of its signature.
+   * It takes the following steps:
+   *
+   * 1) The API can be called at any point on any DOM element and it
+   *    synchronously scans the element subtree for all children with
+   *    `data-l10n-id` attribute set.
+   *
+   * 2) Next, the API collects all of the l10n attributes
+   *    (l10n-id, l10n-args and l10n-attrs), and passes them to the
+   *    callback function together with three `Element` properties:
+   *      `name` - name of the element as lowercase
+   *      `namespaceURI` - namespace URI
+   *      `type` - the type prop of the element (used for input sanitization)
+   *
+   * 3) The callback function is responsible for (asynchronously) collecting
+   *    the translations for all l10n id+args pairs, sanitizing them and then
+   *    return them back to this API.
+   *
+   * 4) The API takes the list of elements collected in step (1) and their
+   *    translations and applies all of the translation values onto
+   *    the elements.
+   *
+   * 5) The API returns a list with empty slots for all translated elements
+   *    and references to elements that could not be translated.
+   *
+   * 6) The JS handles the translations of remaining elements.
+   *
+   *
+   * Through the whole cycle, the API uses the same list of elements and
+   * corresponding translations. It means that after step (1), the element
+   * at index 1 will match the l10nData at index 1, translations at index 1
+   * and in the final return list, the element will be also stored at index 1
+   * or the slot will be empty if the translations was applied on the C++ side.
+   *
+   * Note: There are several reasons why the JS callback may pass undefined for
+   *       a given element including missing translation, or the need to
+   *       translate the element using DOM Overlays.
+   *
+   *
+   * Example of use from JS:
+   *
+   * async function translateFragment(frag) {
+   *   let untranslatedElements = await frag.localize(
+   *     async cb(l10nItems) => {                          // 1
+   *       let trans = await getTranslations(l10nItems);   // 2
+   *       return trans;
+   *     }
+   *   );
+   *
+   *   annotateMissingTranslations(untranslatedElements);  // 3
+   * }
+   *
+   * [1] l10nItems == [
+   *       {
+   *         l10nId: "key1",
+   *         l10nArgs: null,
+   *         l10nAttrs: null,
+   *         name: "button"
+   *         namespaceURI: "..."
+   *         type: null
+   *       },
+   *       {
+   *         l10nId: "key2",
+   *         l10nArgs: {unreadCount: 5},
+   *         l10nAttrs: null,
+   *         name: "label"
+   *         namespaceURI: "..."
+   *         type: null
+   *       },
+   *       {
+   *         l10nId: "key3",
+   *         l10nArgs: null,
+   *         l10nAttrs: "title",
+   *         name: "window"
+   *         namespaceURI: "..."
+   *         type: null
+   *       },
+   *     ]
+   * [2] trans == [
+   *       {value: "Key 1", attributes: {accesskey: "K"} },
+   *       undefined,
+   *       {value: null, attributes: {title: "Unread emails: 5"} },
+   *     ]
+   * [3] untranslatedElements == [
+   *       ,
+   *       <label>
+   *       ,
+   *     ]
+   *
+   * For exact dictionary structures, see `L10nUtils.webidl`.
+   */
+  [ChromeOnly, Throws]
+  Promise<void> localize(L10nCallback l10nCallback);
+
+#ifdef ACCESSIBILITY
+  [Func="mozilla::dom::AccessibleNode::IsAOMEnabled", SameObject]
+  readonly attribute AccessibleNode? accessibleNode;
+#endif
+};
+
+dictionary GetRootNodeOptions {
+  boolean composed = false;
+};
diff --git a/crates/web-sys/webidls/available/NodeFilter.webidl b/crates/web-sys/webidls/available/NodeFilter.webidl
new file mode 100644
index 00000000..6da959dc
--- /dev/null
+++ b/crates/web-sys/webidls/available/NodeFilter.webidl
@@ -0,0 +1,32 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dom.spec.whatwg.org/#interface-nodefilter
+ */
+
+callback interface NodeFilter {
+  // Constants for acceptNode()
+  const unsigned short FILTER_ACCEPT = 1;
+  const unsigned short FILTER_REJECT = 2;
+  const unsigned short FILTER_SKIP = 3;
+
+  // Constants for whatToShow
+  const unsigned long SHOW_ALL = 0xFFFFFFFF;
+  const unsigned long SHOW_ELEMENT = 0x1;
+  const unsigned long SHOW_ATTRIBUTE = 0x2; // historical
+  const unsigned long SHOW_TEXT = 0x4;
+  const unsigned long SHOW_CDATA_SECTION = 0x8; // historical
+  const unsigned long SHOW_ENTITY_REFERENCE = 0x10; // historical
+  const unsigned long SHOW_ENTITY = 0x20; // historical
+  const unsigned long SHOW_PROCESSING_INSTRUCTION = 0x40;
+  const unsigned long SHOW_COMMENT = 0x80;
+  const unsigned long SHOW_DOCUMENT = 0x100;
+  const unsigned long SHOW_DOCUMENT_TYPE = 0x200;
+  const unsigned long SHOW_DOCUMENT_FRAGMENT = 0x400;
+  const unsigned long SHOW_NOTATION = 0x800; // historical
+
+  unsigned short acceptNode(Node node);
+};
diff --git a/crates/web-sys/webidls/available/NodeIterator.webidl b/crates/web-sys/webidls/available/NodeIterator.webidl
new file mode 100644
index 00000000..201b382a
--- /dev/null
+++ b/crates/web-sys/webidls/available/NodeIterator.webidl
@@ -0,0 +1,31 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/2012/WD-dom-20120105/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface NodeIterator {
+  [Constant]
+  readonly attribute Node root;
+  [Pure]
+  readonly attribute Node? referenceNode;
+  [Pure]
+  readonly attribute boolean pointerBeforeReferenceNode;
+  [Constant]
+  readonly attribute unsigned long whatToShow;
+  [Constant]
+  readonly attribute NodeFilter? filter;
+
+  [Throws]
+  Node? nextNode();
+  [Throws]
+  Node? previousNode();
+
+  void detach();
+};
diff --git a/crates/web-sys/webidls/available/NodeList.webidl b/crates/web-sys/webidls/available/NodeList.webidl
new file mode 100644
index 00000000..7e794e76
--- /dev/null
+++ b/crates/web-sys/webidls/available/NodeList.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/2012/WD-dom-20120105/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[ProbablyShortLivingWrapper]
+interface NodeList {
+  getter Node? item(unsigned long index);
+  readonly attribute unsigned long length;
+  iterable<Node?>;
+};
diff --git a/crates/web-sys/webidls/available/Notification.webidl b/crates/web-sys/webidls/available/Notification.webidl
new file mode 100644
index 00000000..4c243bab
--- /dev/null
+++ b/crates/web-sys/webidls/available/Notification.webidl
@@ -0,0 +1,97 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://notifications.spec.whatwg.org/
+ *
+ * Copyright:
+ * To the extent possible under law, the editors have waived all copyright and
+ * related or neighboring rights to this work.
+ */
+
+[Constructor(DOMString title, optional NotificationOptions options),
+ Exposed=(Window,Worker),
+ Func="mozilla::dom::Notification::PrefEnabled"]
+interface Notification : EventTarget {
+  [GetterThrows]
+  static readonly attribute NotificationPermission permission;
+
+  [Throws, Func="mozilla::dom::Notification::RequestPermissionEnabledForScope"]
+  static Promise<NotificationPermission> requestPermission(optional NotificationPermissionCallback permissionCallback);
+
+  [Throws, Func="mozilla::dom::Notification::IsGetEnabled"]
+  static Promise<sequence<Notification>> get(optional GetNotificationOptions filter);
+
+  attribute EventHandler onclick;
+
+  attribute EventHandler onshow;
+
+  attribute EventHandler onerror;
+
+  attribute EventHandler onclose;
+
+  [Pure]
+  readonly attribute DOMString title;
+
+  [Pure]
+  readonly attribute NotificationDirection dir;
+
+  [Pure]
+  readonly attribute DOMString? lang;
+
+  [Pure]
+  readonly attribute DOMString? body;
+
+  [Constant]
+  readonly attribute DOMString? tag;
+
+  [Pure]
+  readonly attribute DOMString? icon;
+
+  [Constant, Func="mozilla::dom::DOMPrefs::NotificationRIEnabled"]
+  readonly attribute boolean requireInteraction;
+
+  [Constant]
+  readonly attribute any data;
+
+  void close();
+};
+
+dictionary NotificationOptions {
+  NotificationDirection dir = "auto";
+  DOMString lang = "";
+  DOMString body = "";
+  DOMString tag = "";
+  DOMString icon = "";
+  boolean requireInteraction = false;
+  any data = null;
+  NotificationBehavior mozbehavior = null;
+};
+
+dictionary GetNotificationOptions {
+  DOMString tag = "";
+};
+
+dictionary NotificationBehavior {
+  boolean noscreen = false;
+  boolean noclear = false;
+  boolean showOnlyOnce = false;
+  DOMString soundFile = "";
+  sequence<unsigned long> vibrationPattern;
+};
+
+enum NotificationPermission {
+  "default",
+  "denied",
+  "granted"
+};
+
+callback NotificationPermissionCallback = void (NotificationPermission permission);
+
+enum NotificationDirection {
+  "auto",
+  "ltr",
+  "rtl"
+};
diff --git a/crates/web-sys/webidls/available/NotificationEvent.webidl b/crates/web-sys/webidls/available/NotificationEvent.webidl
new file mode 100644
index 00000000..47a30349
--- /dev/null
+++ b/crates/web-sys/webidls/available/NotificationEvent.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://notifications.spec.whatwg.org/
+ *
+ * Copyright:
+ * To the extent possible under law, the editors have waived all copyright and
+ * related or neighboring rights to this work.
+ */
+
+[Constructor(DOMString type, NotificationEventInit eventInitDict),
+ Exposed=ServiceWorker,Func="mozilla::dom::Notification::PrefEnabled"]
+interface NotificationEvent : ExtendableEvent {
+  readonly attribute Notification notification;
+};
+
+dictionary NotificationEventInit : ExtendableEventInit {
+  required Notification notification;
+};
diff --git a/crates/web-sys/webidls/available/NotifyPaintEvent.webidl b/crates/web-sys/webidls/available/NotifyPaintEvent.webidl
new file mode 100644
index 00000000..0560b8bd
--- /dev/null
+++ b/crates/web-sys/webidls/available/NotifyPaintEvent.webidl
@@ -0,0 +1,37 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/**
+ * The NotifyPaintEvent interface is used for the MozDOMAfterPaint
+ * event, which fires at a window when painting has happened in
+ * that window.
+ */
+[ChromeOnly]
+interface NotifyPaintEvent : Event
+{
+  /**
+   * Get a list of rectangles which are affected. The rectangles are
+   * in CSS pixels relative to the viewport origin.
+   */
+  [ChromeOnly, NeedsCallerType]
+  readonly attribute DOMRectList clientRects;
+
+  /**
+   * Get the bounding box of the rectangles which are affected. The rectangle
+   * is in CSS pixels relative to the viewport origin.
+   */
+  [ChromeOnly, NeedsCallerType]
+  readonly attribute DOMRect boundingClientRect;
+
+  [ChromeOnly, NeedsCallerType]
+  readonly attribute PaintRequestList paintRequests;
+
+  [ChromeOnly, NeedsCallerType]
+  readonly attribute unsigned long long transactionId;
+
+  [ChromeOnly, NeedsCallerType]
+  readonly attribute DOMHighResTimeStamp paintTimeStamp;
+};
diff --git a/crates/web-sys/webidls/available/OfflineAudioCompletionEvent.webidl b/crates/web-sys/webidls/available/OfflineAudioCompletionEvent.webidl
new file mode 100644
index 00000000..03c58b96
--- /dev/null
+++ b/crates/web-sys/webidls/available/OfflineAudioCompletionEvent.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary OfflineAudioCompletionEventInit : EventInit {
+    required AudioBuffer renderedBuffer;
+};
+
+[Constructor(DOMString type, OfflineAudioCompletionEventInit eventInitDict),
+ Pref="dom.webaudio.enabled"]
+interface OfflineAudioCompletionEvent : Event {
+    readonly attribute AudioBuffer renderedBuffer;
+};
diff --git a/crates/web-sys/webidls/available/OfflineAudioContext.webidl b/crates/web-sys/webidls/available/OfflineAudioContext.webidl
new file mode 100644
index 00000000..a2498d6e
--- /dev/null
+++ b/crates/web-sys/webidls/available/OfflineAudioContext.webidl
@@ -0,0 +1,31 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary OfflineAudioContextOptions {
+             unsigned long numberOfChannels = 1;
+    required unsigned long length;
+    required float         sampleRate;
+};
+
+[Constructor (OfflineAudioContextOptions contextOptions),
+Constructor(unsigned long numberOfChannels, unsigned long length, float sampleRate),
+Pref="dom.webaudio.enabled"]
+interface OfflineAudioContext : BaseAudioContext {
+
+    [Throws]
+    Promise<AudioBuffer> startRendering();
+
+    // TODO: Promise<void>        suspend (double suspendTime);
+
+    readonly        attribute unsigned long length;
+                    attribute EventHandler  oncomplete;
+};
diff --git a/crates/web-sys/webidls/available/OfflineResourceList.webidl b/crates/web-sys/webidls/available/OfflineResourceList.webidl
new file mode 100644
index 00000000..a1561e85
--- /dev/null
+++ b/crates/web-sys/webidls/available/OfflineResourceList.webidl
@@ -0,0 +1,123 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+[Pref="browser.cache.offline.enable", Func="nsGlobalWindowInner::OfflineCacheAllowedForContext"]
+interface OfflineResourceList : EventTarget {
+  /**
+   * State of the application cache this object is associated with.
+   */
+
+  /* This object is not associated with an application cache. */
+  const unsigned short UNCACHED = 0;
+
+  /* The application cache is not being updated. */
+  const unsigned short IDLE = 1;
+
+  /* The manifest is being fetched and checked for updates */
+  const unsigned short CHECKING = 2;
+
+  /* Resources are being downloaded to be added to the cache */
+  const unsigned short DOWNLOADING = 3;
+
+  /* There is a new version of the application cache available */
+  const unsigned short UPDATEREADY = 4;
+
+  /* The application cache group is now obsolete. */
+  const unsigned short OBSOLETE = 5;
+
+  [Throws, UseCounter]
+  readonly attribute unsigned short status;
+
+  /**
+   * Begin the application update process on the associated application cache.
+   */
+  [Throws, UseCounter]
+  void update();
+
+  /**
+   * Swap in the newest version of the application cache, or disassociate
+   * from the cache if the cache group is obsolete.
+   */
+  [Throws, UseCounter]
+  void swapCache();
+
+  /* Events */
+  [UseCounter]
+  attribute EventHandler onchecking;
+  [UseCounter]
+  attribute EventHandler onerror;
+  [UseCounter]
+  attribute EventHandler onnoupdate;
+  [UseCounter]
+  attribute EventHandler ondownloading;
+  [UseCounter]
+  attribute EventHandler onprogress;
+  [UseCounter]
+  attribute EventHandler onupdateready;
+  [UseCounter]
+  attribute EventHandler oncached;
+  [UseCounter]
+  attribute EventHandler onobsolete;
+};
+
+// Mozilla extensions.
+partial interface OfflineResourceList {
+  /**
+   * Get the list of dynamically-managed entries.
+   */
+  [Throws]
+  readonly attribute DOMStringList mozItems;
+
+  /**
+   * Check that an entry exists in the list of dynamically-managed entries.
+   *
+   * @param uri
+   *        The resource to check.
+   */
+  [Throws]
+  boolean mozHasItem(DOMString uri);
+
+  /**
+   * Get the number of dynamically-managed entries.
+   * @status DEPRECATED
+   *         Clients should use the "items" attribute.
+   */
+  [Throws]
+  readonly attribute unsigned long mozLength;
+
+  /**
+   * Get the URI of a dynamically-managed entry.
+   * @status DEPRECATED
+   *         Clients should use the "items" attribute.
+   */
+  [Throws]
+  getter DOMString mozItem(unsigned long index);
+
+  /**
+   * We need a "length" to actually be valid Web IDL, given that we have an
+   * indexed getter.
+   */
+  readonly attribute unsigned long length;
+
+  /**
+   * Add an item to the list of dynamically-managed entries.  The resource
+   * will be fetched into the application cache.
+   *
+   * @param uri
+   *        The resource to add.
+   */
+  [Throws]
+  void mozAdd(DOMString uri);
+
+  /**
+   * Remove an item from the list of dynamically-managed entries.  If this
+   * was the last reference to a URI in the application cache, the cache
+   * entry will be removed.
+   *
+   * @param uri
+   *        The resource to remove.
+   */
+  [Throws]
+  void mozRemove(DOMString uri);
+};
diff --git a/crates/web-sys/webidls/available/OffscreenCanvas.webidl b/crates/web-sys/webidls/available/OffscreenCanvas.webidl
new file mode 100644
index 00000000..449277fc
--- /dev/null
+++ b/crates/web-sys/webidls/available/OffscreenCanvas.webidl
@@ -0,0 +1,30 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface, please see
+ * https://wiki.whatwg.org/wiki/OffscreenCanvas
+ */
+
+[Constructor(unsigned long width, unsigned long height),
+ Exposed=(Window,Worker),
+ Func="mozilla::dom::DOMPrefs::OffscreenCanvasEnabled"]
+interface OffscreenCanvas : EventTarget {
+  [Pure, SetterThrows]
+  attribute unsigned long width;
+  [Pure, SetterThrows]
+  attribute unsigned long height;
+
+  [Throws]
+  nsISupports? getContext(DOMString contextId,
+                          optional any contextOptions = null);
+
+  [Throws]
+  ImageBitmap transferToImageBitmap();
+  [Throws]
+  Promise<Blob> toBlob(optional DOMString type = "",
+                       optional any encoderOptions);
+};
+
+// OffscreenCanvas implements Transferable;
diff --git a/crates/web-sys/webidls/available/OscillatorNode.webidl b/crates/web-sys/webidls/available/OscillatorNode.webidl
new file mode 100644
index 00000000..acf75a81
--- /dev/null
+++ b/crates/web-sys/webidls/available/OscillatorNode.webidl
@@ -0,0 +1,42 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum OscillatorType {
+  "sine",
+  "square",
+  "sawtooth",
+  "triangle",
+  "custom"
+};
+
+dictionary OscillatorOptions : AudioNodeOptions {
+             OscillatorType type = "sine";
+             float          frequency = 440;
+             float          detune = 0;
+             PeriodicWave   periodicWave;
+};
+
+[Pref="dom.webaudio.enabled",
+ Constructor(BaseAudioContext context, optional OscillatorOptions options)]
+interface OscillatorNode : AudioScheduledSourceNode {
+
+    [SetterThrows]
+    attribute OscillatorType type;
+
+    readonly attribute AudioParam frequency; // in Hertz
+    readonly attribute AudioParam detune; // in Cents
+
+    void setPeriodicWave(PeriodicWave periodicWave);
+};
+
+// Mozilla extensions
+OscillatorNode implements AudioNodePassThrough;
diff --git a/crates/web-sys/webidls/available/PageTransitionEvent.webidl b/crates/web-sys/webidls/available/PageTransitionEvent.webidl
new file mode 100644
index 00000000..a0749e7f
--- /dev/null
+++ b/crates/web-sys/webidls/available/PageTransitionEvent.webidl
@@ -0,0 +1,32 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/**
+ * The PageTransitionEvent interface is used for the pageshow and
+ * pagehide events, which are generic events that apply to both page
+ * load/unload and saving/restoring a document from session history.
+ */
+
+[Constructor(DOMString type, optional PageTransitionEventInit eventInitDict)]
+interface PageTransitionEvent : Event
+{
+  /**
+   * Set to true if the document has been or will be persisted across
+   * firing of the event.  For example, if a document is being cached in
+   * session history, |persisted| is true for the PageHide event.
+   */
+  readonly attribute boolean persisted;
+
+  // Whether the document is in the middle of a frame swap.
+  [ChromeOnly]
+  readonly attribute boolean inFrameSwap;
+};
+
+dictionary PageTransitionEventInit : EventInit
+{
+  boolean persisted = false;
+  boolean inFrameSwap = false;
+};
diff --git a/crates/web-sys/webidls/available/PaintRequest.webidl b/crates/web-sys/webidls/available/PaintRequest.webidl
new file mode 100644
index 00000000..065be086
--- /dev/null
+++ b/crates/web-sys/webidls/available/PaintRequest.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * These objects are exposed by the MozDOMAfterPaint event. Each one represents
+ * a request to repaint a rectangle that was generated by the browser.
+ */
+interface PaintRequest {
+  /**
+   * The client rect where invalidation was triggered.
+   */
+  readonly attribute DOMRect clientRect;
+
+  /**
+   * The reason for the request, as a string. If an empty string, then we don't know
+   * the reason (this is common). Reasons include "scroll repaint", meaning that we
+   * needed to repaint the rectangle due to scrolling, and "scroll copy", meaning
+   * that we updated the rectangle due to scrolling but instead of painting
+   * manually, we were able to do a copy from another area of the screen.
+   */
+  readonly attribute DOMString reason;
+};
diff --git a/crates/web-sys/webidls/available/PaintRequestList.webidl b/crates/web-sys/webidls/available/PaintRequestList.webidl
new file mode 100644
index 00000000..d14f18a7
--- /dev/null
+++ b/crates/web-sys/webidls/available/PaintRequestList.webidl
@@ -0,0 +1,10 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+interface PaintRequestList {
+  readonly attribute unsigned long length;
+  getter PaintRequest? item(unsigned long index);
+};
diff --git a/crates/web-sys/webidls/available/PaintWorkletGlobalScope.webidl b/crates/web-sys/webidls/available/PaintWorkletGlobalScope.webidl
new file mode 100644
index 00000000..19a1fdd4
--- /dev/null
+++ b/crates/web-sys/webidls/available/PaintWorkletGlobalScope.webidl
@@ -0,0 +1,13 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.css-houdini.org/css-paint-api-1/#paintworkletglobalscope
+ */
+
+[Global=(Worklet,PaintWorklet),Exposed=PaintWorklet]
+interface PaintWorkletGlobalScope : WorkletGlobalScope {
+    void registerPaint(DOMString name, VoidFunction paintCtor);
+};
diff --git a/crates/web-sys/webidls/available/PannerNode.webidl b/crates/web-sys/webidls/available/PannerNode.webidl
new file mode 100644
index 00000000..d562dccd
--- /dev/null
+++ b/crates/web-sys/webidls/available/PannerNode.webidl
@@ -0,0 +1,79 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum PanningModelType {
+  "equalpower",
+  "HRTF"
+};
+
+enum DistanceModelType {
+  "linear",
+  "inverse",
+  "exponential"
+};
+
+dictionary PannerOptions : AudioNodeOptions {
+             PanningModelType  panningModel = "equalpower";
+             DistanceModelType distanceModel = "inverse";
+             float             positionX = 0;
+             float             positionY = 0;
+             float             positionZ = 0;
+             float             orientationX = 1;
+             float             orientationY = 0;
+             float             orientationZ = 0;
+             double            refDistance = 1;
+             double            maxDistance = 10000;
+             double            rolloffFactor = 1;
+             double            coneInnerAngle = 360;
+             double            coneOuterAngle = 360;
+             double            coneOuterGain = 0;
+};
+
+[Pref="dom.webaudio.enabled",
+ Constructor(BaseAudioContext context, optional PannerOptions options)]
+interface PannerNode : AudioNode {
+
+    // Default for stereo is equalpower
+    attribute PanningModelType panningModel;
+
+    // Uses a 3D cartesian coordinate system
+    void setPosition(double x, double y, double z);
+    void setOrientation(double x, double y, double z);
+    [Deprecated="PannerNodeDoppler"]
+    void setVelocity(double x, double y, double z);
+
+    // Cartesian coordinate for position
+    readonly attribute AudioParam positionX;
+    readonly attribute AudioParam positionY;
+    readonly attribute AudioParam positionZ;
+
+    // Cartesian coordinate for orientation
+    readonly attribute AudioParam orientationX;
+    readonly attribute AudioParam orientationY;
+    readonly attribute AudioParam orientationZ;
+
+    // Distance model and attributes
+    attribute DistanceModelType distanceModel;
+    attribute double refDistance;
+    attribute double maxDistance;
+    attribute double rolloffFactor;
+
+    // Directional sound cone
+    attribute double coneInnerAngle;
+    attribute double coneOuterAngle;
+    attribute double coneOuterGain;
+
+};
+
+// Mozilla extension
+PannerNode implements AudioNodePassThrough;
+
diff --git a/crates/web-sys/webidls/available/ParentNode.webidl b/crates/web-sys/webidls/available/ParentNode.webidl
new file mode 100644
index 00000000..aa6ca5db
--- /dev/null
+++ b/crates/web-sys/webidls/available/ParentNode.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dom.spec.whatwg.org/#interface-parentnode
+ */
+
+[NoInterfaceObject]
+interface ParentNode {
+  [Constant]
+  readonly attribute HTMLCollection children;
+  [Pure]
+  readonly attribute Element? firstElementChild;
+  [Pure]
+  readonly attribute Element? lastElementChild;
+  [Pure]
+  readonly attribute unsigned long childElementCount;
+
+  [CEReactions, Throws, Unscopable]
+  void prepend((Node or DOMString)... nodes);
+  [CEReactions, Throws, Unscopable]
+  void append((Node or DOMString)... nodes);
+};
diff --git a/crates/web-sys/webidls/available/ParentSHistory.webidl b/crates/web-sys/webidls/available/ParentSHistory.webidl
new file mode 100644
index 00000000..f892172d
--- /dev/null
+++ b/crates/web-sys/webidls/available/ParentSHistory.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/**
+ * The ParentSHistory interface represents the parent side of a browsing
+ * context's session history. Theoretically this object manages all session
+ * history state for the browsing context.
+ */
+[ChromeOnly]
+interface ParentSHistory {
+  [Pure]
+  readonly attribute long count;
+  [Pure]
+  readonly attribute long index;
+};
diff --git a/crates/web-sys/webidls/available/PaymentAddress.webidl b/crates/web-sys/webidls/available/PaymentAddress.webidl
new file mode 100644
index 00000000..06fffeaf
--- /dev/null
+++ b/crates/web-sys/webidls/available/PaymentAddress.webidl
@@ -0,0 +1,29 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this WebIDL file is
+ *   https://www.w3.org/TR/payment-request/#paymentaddress-interface
+ */
+
+[SecureContext,
+ Func="mozilla::dom::PaymentRequest::PrefEnabled"]
+interface PaymentAddress {
+  [Default] object toJSON();
+
+  readonly attribute DOMString              country;
+  // TODO: Use FrozenArray once available. (Bug 1236777)
+  // readonly attribute FrozenArray<DOMString> addressLine;
+  [Frozen, Cached, Pure]
+  readonly attribute sequence<DOMString>    addressLine;
+  readonly attribute DOMString              region;
+  readonly attribute DOMString              city;
+  readonly attribute DOMString              dependentLocality;
+  readonly attribute DOMString              postalCode;
+  readonly attribute DOMString              sortingCode;
+  readonly attribute DOMString              languageCode;
+  readonly attribute DOMString              organization;
+  readonly attribute DOMString              recipient;
+  readonly attribute DOMString              phone;
+};
diff --git a/crates/web-sys/webidls/available/PaymentMethodChangeEvent.webidl b/crates/web-sys/webidls/available/PaymentMethodChangeEvent.webidl
new file mode 100644
index 00000000..551e6042
--- /dev/null
+++ b/crates/web-sys/webidls/available/PaymentMethodChangeEvent.webidl
@@ -0,0 +1,13 @@
+[Constructor(DOMString type, optional PaymentMethodChangeEventInit eventInitDict),
+ SecureContext,
+ Exposed=Window,
+ Func="mozilla::dom::PaymentRequest::PrefEnabled"]
+interface PaymentMethodChangeEvent : PaymentRequestUpdateEvent {
+    readonly attribute DOMString methodName;
+    readonly attribute object?   methodDetails;
+};
+
+dictionary PaymentMethodChangeEventInit : PaymentRequestUpdateEventInit {
+    required DOMString methodName;
+             object?   methodDetails;
+};
diff --git a/crates/web-sys/webidls/available/PaymentRequest.webidl b/crates/web-sys/webidls/available/PaymentRequest.webidl
new file mode 100644
index 00000000..f1d53447
--- /dev/null
+++ b/crates/web-sys/webidls/available/PaymentRequest.webidl
@@ -0,0 +1,112 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this WebIDL file is
+ *   https://www.w3.org/TR/payment-request/#paymentrequest-interface
+ */
+
+dictionary PaymentMethodData {
+  required DOMString           supportedMethods;
+           object              data;
+};
+
+dictionary PaymentCurrencyAmount {
+  required DOMString currency;
+  required DOMString value;
+           DOMString currencySystem = "urn:iso:std:iso:4217";
+};
+
+enum PaymentItemType {
+  "tax"
+};
+
+dictionary PaymentItem {
+  required DOMString             label;
+  required PaymentCurrencyAmount amount;
+           boolean               pending = false;
+           PaymentItemType       type;
+};
+
+dictionary PaymentShippingOption {
+  required DOMString             id;
+  required DOMString             label;
+  required PaymentCurrencyAmount amount;
+           boolean               selected = false;
+};
+
+dictionary PaymentDetailsModifier {
+  required DOMString             supportedMethods;
+           PaymentItem           total;
+           sequence<PaymentItem> additionalDisplayItems;
+           object                data;
+};
+
+dictionary PaymentDetailsBase {
+  sequence<PaymentItem>            displayItems;
+  sequence<PaymentShippingOption>  shippingOptions;
+  sequence<PaymentDetailsModifier> modifiers;
+};
+
+dictionary PaymentDetailsInit : PaymentDetailsBase {
+           DOMString   id;
+  required PaymentItem total;
+};
+
+dictionary AddressErrors {
+  DOMString addressLine;
+  DOMString city;
+  DOMString country;
+  DOMString dependentLocality;
+  DOMString languageCode;
+  DOMString organization;
+  DOMString phone;
+  DOMString postalCode;
+  DOMString recipient;
+  DOMString region;
+  DOMString regionCode;
+  DOMString sortingCode;
+};
+
+dictionary PaymentDetailsUpdate : PaymentDetailsBase {
+  DOMString     error;
+  AddressErrors shippingAddressErrors;
+  PaymentItem   total;
+};
+
+enum PaymentShippingType {
+  "shipping",
+  "delivery",
+  "pickup"
+};
+
+dictionary PaymentOptions {
+  boolean             requestPayerName = false;
+  boolean             requestPayerEmail = false;
+  boolean             requestPayerPhone = false;
+  boolean             requestShipping = false;
+  PaymentShippingType shippingType = "shipping";
+};
+
+[Constructor(sequence<PaymentMethodData> methodData, PaymentDetailsInit details,
+             optional PaymentOptions options),
+ SecureContext,
+ Func="mozilla::dom::PaymentRequest::PrefEnabled"]
+interface PaymentRequest : EventTarget {
+  [NewObject]
+  Promise<PaymentResponse> show(optional Promise<PaymentDetailsUpdate> detailsPromise);
+  [NewObject]
+  Promise<void>            abort();
+  [NewObject]
+  Promise<boolean>         canMakePayment();
+
+  readonly attribute DOMString            id;
+  readonly attribute PaymentAddress?      shippingAddress;
+  readonly attribute DOMString?           shippingOption;
+  readonly attribute PaymentShippingType? shippingType;
+
+           attribute EventHandler         onshippingaddresschange;
+           attribute EventHandler         onshippingoptionchange;
+           attribute EventHandler         onpaymentmethodchange;
+};
diff --git a/crates/web-sys/webidls/available/PaymentRequestUpdateEvent.webidl b/crates/web-sys/webidls/available/PaymentRequestUpdateEvent.webidl
new file mode 100644
index 00000000..15e7f64e
--- /dev/null
+++ b/crates/web-sys/webidls/available/PaymentRequestUpdateEvent.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this WebIDL file is
+ *   https://www.w3.org/TR/payment-request/#paymentrequestupdateevent-interface
+ */
+
+[Constructor(DOMString type,
+             optional PaymentRequestUpdateEventInit eventInitDict),
+ SecureContext,
+ Func="mozilla::dom::PaymentRequest::PrefEnabled"]
+interface PaymentRequestUpdateEvent : Event {
+  [Throws]
+  void updateWith(Promise<PaymentDetailsUpdate> detailsPromise);
+};
+
+dictionary PaymentRequestUpdateEventInit : EventInit {
+};
diff --git a/crates/web-sys/webidls/available/PaymentResponse.webidl b/crates/web-sys/webidls/available/PaymentResponse.webidl
new file mode 100644
index 00000000..112699b0
--- /dev/null
+++ b/crates/web-sys/webidls/available/PaymentResponse.webidl
@@ -0,0 +1,32 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this WebIDL file is
+ *   https://www.w3.org/TR/payment-request/#paymentresponse-interface
+ */
+
+enum PaymentComplete {
+  "success",
+  "fail",
+  "unknown"
+};
+
+[SecureContext,
+ Func="mozilla::dom::PaymentRequest::PrefEnabled"]
+interface PaymentResponse {
+  [Default] object toJSON();
+
+  readonly attribute DOMString       requestId;
+  readonly attribute DOMString       methodName;
+  readonly attribute object          details;
+  readonly attribute PaymentAddress? shippingAddress;
+  readonly attribute DOMString?      shippingOption;
+  readonly attribute DOMString?      payerName;
+  readonly attribute DOMString?      payerEmail;
+  readonly attribute DOMString?      payerPhone;
+
+  [NewObject]
+  Promise<void> complete(optional PaymentComplete result = "unknown");
+};
diff --git a/crates/web-sys/webidls/available/PeerConnectionImpl.webidl b/crates/web-sys/webidls/available/PeerConnectionImpl.webidl
new file mode 100644
index 00000000..bbef2175
--- /dev/null
+++ b/crates/web-sys/webidls/available/PeerConnectionImpl.webidl
@@ -0,0 +1,133 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * PeerConnection.js' interface to the C++ PeerConnectionImpl.
+ *
+ * Do not confuse with RTCPeerConnection. This interface is purely for
+ * communication between the PeerConnection JS DOM binding and the C++
+ * implementation in SIPCC.
+ *
+ * See media/webrtc/signaling/include/PeerConnectionImpl.h
+ *
+ */
+
+interface nsISupports;
+
+/* Must be created first. Observer events will be dispatched on the thread provided */
+[ChromeOnly, Constructor]
+interface PeerConnectionImpl  {
+  /* Must be called first. Observer events dispatched on the thread provided */
+  [Throws]
+  void initialize(PeerConnectionObserver observer, Window window,
+                  RTCConfiguration iceServers,
+                  nsISupports thread);
+
+  /* JSEP calls */
+  [Throws]
+  void createOffer(optional RTCOfferOptions options);
+  [Throws]
+  void createAnswer();
+  [Throws]
+  void setLocalDescription(long action, DOMString sdp);
+  [Throws]
+  void setRemoteDescription(long action, DOMString sdp);
+
+  /* Stats call, calls either |onGetStatsSuccess| or |onGetStatsError| on our
+     observer. (see the |PeerConnectionObserver| interface) */
+  [Throws]
+  void getStats(MediaStreamTrack? selector);
+
+  /* Adds the tracks created by GetUserMedia */
+  [Throws]
+  TransceiverImpl createTransceiverImpl(DOMString kind,
+                                        MediaStreamTrack? track);
+  [Throws]
+  boolean checkNegotiationNeeded();
+  [Throws]
+  void insertDTMF(TransceiverImpl transceiver, DOMString tones,
+                  optional unsigned long duration = 100,
+                  optional unsigned long interToneGap = 70);
+  [Throws]
+  DOMString getDTMFToneBuffer(RTCRtpSender sender);
+  [Throws]
+  sequence<RTCRtpSourceEntry> getRtpSources(MediaStreamTrack track,
+                                            DOMHighResTimeStamp rtpSourceNow);
+  DOMHighResTimeStamp getNowInRtpSourceReferenceTime();
+
+  [Throws]
+  void replaceTrackNoRenegotiation(TransceiverImpl transceiverImpl,
+                                   MediaStreamTrack? withTrack);
+  [Throws]
+  void closeStreams();
+
+  [Throws]
+  void addRIDExtension(MediaStreamTrack recvTrack, unsigned short extensionId);
+  [Throws]
+  void addRIDFilter(MediaStreamTrack recvTrack, DOMString rid);
+
+  // Inserts CSRC data for the RtpSourceObserver for testing
+  [Throws]
+  void insertAudioLevelForContributingSource(MediaStreamTrack recvTrack,
+                                             unsigned long source,
+                                             DOMHighResTimeStamp timestamp,
+                                             boolean hasLevel,
+                                             byte level);
+
+  [Throws]
+  void enablePacketDump(unsigned long level,
+                        mozPacketDumpType type,
+                        boolean sending);
+
+  [Throws]
+  void disablePacketDump(unsigned long level,
+                         mozPacketDumpType type,
+                         boolean sending);
+
+  /* As the ICE candidates roll in this one should be called each time
+   * in order to keep the candidate list up-to-date for the next SDP-related
+   * call PeerConnectionImpl does not parse ICE candidates, just sticks them
+   * into the SDP.
+   */
+  [Throws]
+  void addIceCandidate(DOMString candidate, DOMString mid, unsigned short level);
+
+  /* Puts the SIPCC engine back to 'kIdle', shuts down threads, deletes state */
+  [Throws]
+  void close();
+
+  /* Notify DOM window if this plugin crash is ours. */
+  boolean pluginCrash(unsigned long long pluginId, DOMString name);
+
+  /* Attributes */
+  /* This provides the implementation with the certificate it uses to
+   * authenticate itself.  The JS side must set this before calling
+   * createOffer/createAnswer or retrieving the value of fingerprint.  This has
+   * to be delayed because generating the certificate takes some time. */
+  attribute RTCCertificate certificate;
+  [Constant]
+  readonly attribute DOMString fingerprint;
+  readonly attribute DOMString localDescription;
+  readonly attribute DOMString currentLocalDescription;
+  readonly attribute DOMString pendingLocalDescription;
+  readonly attribute DOMString remoteDescription;
+  readonly attribute DOMString currentRemoteDescription;
+  readonly attribute DOMString pendingRemoteDescription;
+
+  readonly attribute PCImplIceConnectionState iceConnectionState;
+  readonly attribute PCImplIceGatheringState iceGatheringState;
+  readonly attribute PCImplSignalingState signalingState;
+  attribute DOMString id;
+
+  [SetterThrows]
+  attribute DOMString peerIdentity;
+  readonly attribute boolean privacyRequested;
+
+  /* Data channels */
+  [Throws]
+  RTCDataChannel createDataChannel(DOMString label, DOMString protocol,
+    unsigned short type, boolean ordered,
+    unsigned short maxTime, unsigned short maxNum,
+    boolean externalNegotiated, unsigned short stream);
+};
diff --git a/crates/web-sys/webidls/available/PeerConnectionImplEnums.webidl b/crates/web-sys/webidls/available/PeerConnectionImplEnums.webidl
new file mode 100644
index 00000000..0add53f0
--- /dev/null
+++ b/crates/web-sys/webidls/available/PeerConnectionImplEnums.webidl
@@ -0,0 +1,36 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This is in a separate file so it can be shared with unittests.
+ */
+
+/* Must be in the same order as comparable fsmdef_states_t in fsmdef_states.h */
+enum PCImplSignalingState {
+  "SignalingInvalid",
+  "SignalingStable",
+  "SignalingHaveLocalOffer",
+  "SignalingHaveRemoteOffer",
+  "SignalingHaveLocalPranswer",
+  "SignalingHaveRemotePranswer",
+  "SignalingClosed",
+};
+
+enum PCImplIceConnectionState {
+    "new",
+    "checking",
+    "connected",
+    "completed",
+    "failed",
+    "disconnected",
+    "closed"
+};
+
+// Deliberately identical to the values specified in webrtc
+enum PCImplIceGatheringState {
+  "new",
+  "gathering",
+  "complete"
+};
+
diff --git a/crates/web-sys/webidls/available/PeerConnectionObserver.webidl b/crates/web-sys/webidls/available/PeerConnectionObserver.webidl
new file mode 100644
index 00000000..ff5f7113
--- /dev/null
+++ b/crates/web-sys/webidls/available/PeerConnectionObserver.webidl
@@ -0,0 +1,50 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+interface nsISupports;
+
+[ChromeOnly,
+ JSImplementation="@mozilla.org/dom/peerconnectionobserver;1",
+ Constructor (RTCPeerConnection domPC)]
+interface PeerConnectionObserver
+{
+  /* JSEP callbacks */
+  void onCreateOfferSuccess(DOMString offer);
+  void onCreateOfferError(unsigned long name, DOMString message);
+  void onCreateAnswerSuccess(DOMString answer);
+  void onCreateAnswerError(unsigned long name, DOMString message);
+  void onSetLocalDescriptionSuccess();
+  void onSetRemoteDescriptionSuccess();
+  void onSetLocalDescriptionError(unsigned long name, DOMString message);
+  void onSetRemoteDescriptionError(unsigned long name, DOMString message);
+  void onAddIceCandidateSuccess();
+  void onAddIceCandidateError(unsigned long name, DOMString message);
+  void onIceCandidate(unsigned short level, DOMString mid, DOMString candidate);
+
+  /* Stats callbacks */
+  void onGetStatsSuccess(optional RTCStatsReportInternal report);
+  void onGetStatsError(unsigned long name, DOMString message);
+
+  /* Data channel callbacks */
+  void notifyDataChannel(RTCDataChannel channel);
+
+  /* Notification of one of several types of state changed */
+  void onStateChange(PCObserverStateType state);
+
+  /* Transceiver management; called when setRemoteDescription causes a
+     transceiver to be created on the C++ side */
+  void onTransceiverNeeded(DOMString kind, TransceiverImpl transceiverImpl);
+
+  /* DTMF callback */
+  void onDTMFToneChange(MediaStreamTrack track, DOMString tone);
+
+  /* Packet dump callback */
+  void onPacket(unsigned long level, mozPacketDumpType type, boolean sending,
+                ArrayBuffer packet);
+
+  /* Transceiver sync */
+  void syncTransceivers();
+};
diff --git a/crates/web-sys/webidls/available/PeerConnectionObserverEnums.webidl b/crates/web-sys/webidls/available/PeerConnectionObserverEnums.webidl
new file mode 100644
index 00000000..abe0e076
--- /dev/null
+++ b/crates/web-sys/webidls/available/PeerConnectionObserverEnums.webidl
@@ -0,0 +1,14 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This is in a separate file so it can be shared with unittests.
+ */
+
+enum PCObserverStateType {
+    "None",
+    "IceConnectionState",
+    "IceGatheringState",
+    "SignalingState"
+};
diff --git a/crates/web-sys/webidls/available/Performance.webidl b/crates/web-sys/webidls/available/Performance.webidl
new file mode 100644
index 00000000..e0d6f286
--- /dev/null
+++ b/crates/web-sys/webidls/available/Performance.webidl
@@ -0,0 +1,67 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://w3c.github.io/hr-time/
+ *
+ * Copyright © 2015 W3C® (MIT, ERCIM, Keio, Beihang).
+ * W3C liability, trademark and document use rules apply.
+ */
+
+typedef sequence <PerformanceEntry> PerformanceEntryList;
+
+[Exposed=(Window,Worker)]
+interface Performance : EventTarget {
+  [DependsOn=DeviceState, Affects=Nothing]
+  DOMHighResTimeStamp now();
+
+  [Constant]
+  readonly attribute DOMHighResTimeStamp timeOrigin;
+};
+
+[Exposed=Window]
+partial interface Performance {
+  [Constant]
+  readonly attribute PerformanceTiming timing;
+  [Constant]
+  readonly attribute PerformanceNavigation navigation;
+
+  [Default] object toJSON();
+};
+
+// http://www.w3.org/TR/performance-timeline/#sec-window.performance-attribute
+[Exposed=(Window,Worker)]
+partial interface Performance {
+  PerformanceEntryList getEntries();
+  PerformanceEntryList getEntriesByType(DOMString entryType);
+  PerformanceEntryList getEntriesByName(DOMString name, optional DOMString
+    entryType);
+};
+
+// http://www.w3.org/TR/resource-timing/#extensions-performance-interface
+[Exposed=(Window,Worker)]
+partial interface Performance {
+  void clearResourceTimings();
+  void setResourceTimingBufferSize(unsigned long maxSize);
+  attribute EventHandler onresourcetimingbufferfull;
+};
+
+// GC microbenchmarks, pref-guarded, not for general use (bug 1125412)
+[Exposed=Window]
+partial interface Performance {
+  [Pref="dom.enable_memory_stats"]
+  readonly attribute object mozMemory;
+};
+
+// http://www.w3.org/TR/user-timing/
+[Exposed=(Window,Worker)]
+partial interface Performance {
+  [Throws]
+  void mark(DOMString markName);
+  void clearMarks(optional DOMString markName);
+  [Throws]
+  void measure(DOMString measureName, optional DOMString startMark, optional DOMString endMark);
+  void clearMeasures(optional DOMString measureName);
+};
diff --git a/crates/web-sys/webidls/available/PerformanceEntry.webidl b/crates/web-sys/webidls/available/PerformanceEntry.webidl
new file mode 100644
index 00000000..459a20a6
--- /dev/null
+++ b/crates/web-sys/webidls/available/PerformanceEntry.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3c-test.org/webperf/specs/PerformanceTimeline/#sec-PerformanceEntry-interface
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=(Window,Worker)]
+interface PerformanceEntry
+{
+  readonly attribute DOMString name;
+  readonly attribute DOMString entryType;
+  readonly attribute DOMHighResTimeStamp startTime;
+  readonly attribute DOMHighResTimeStamp duration;
+
+  [Default] object toJSON();
+};
diff --git a/crates/web-sys/webidls/available/PerformanceEntryEvent.webidl b/crates/web-sys/webidls/available/PerformanceEntryEvent.webidl
new file mode 100644
index 00000000..2cf75c5e
--- /dev/null
+++ b/crates/web-sys/webidls/available/PerformanceEntryEvent.webidl
@@ -0,0 +1,27 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+dictionary PerformanceEntryEventInit : EventInit
+{
+  DOMString name = "";
+  DOMString entryType = "";
+  DOMHighResTimeStamp startTime = 0;
+  DOMHighResTimeStamp duration = 0;
+  double epoch = 0;
+  DOMString origin = "";
+};
+
+[Constructor(DOMString type, optional PerformanceEntryEventInit eventInitDict),
+ ChromeOnly]
+interface PerformanceEntryEvent : Event
+{
+  readonly attribute DOMString name;
+  readonly attribute DOMString entryType;
+  readonly attribute DOMHighResTimeStamp startTime;
+  readonly attribute DOMHighResTimeStamp duration;
+  readonly attribute double epoch;
+  readonly attribute DOMString origin;
+};
diff --git a/crates/web-sys/webidls/available/PerformanceMark.webidl b/crates/web-sys/webidls/available/PerformanceMark.webidl
new file mode 100644
index 00000000..20e9e92c
--- /dev/null
+++ b/crates/web-sys/webidls/available/PerformanceMark.webidl
@@ -0,0 +1,13 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/user-timing/#performancemark
+ */
+
+[Exposed=(Window,Worker)]
+interface PerformanceMark : PerformanceEntry
+{
+};
diff --git a/crates/web-sys/webidls/available/PerformanceMeasure.webidl b/crates/web-sys/webidls/available/PerformanceMeasure.webidl
new file mode 100644
index 00000000..aa4e8cd2
--- /dev/null
+++ b/crates/web-sys/webidls/available/PerformanceMeasure.webidl
@@ -0,0 +1,13 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/user-timing/#performancemeasure
+ */
+
+[Exposed=(Window,Worker)]
+interface PerformanceMeasure : PerformanceEntry
+{
+};
diff --git a/crates/web-sys/webidls/available/PerformanceNavigation.webidl b/crates/web-sys/webidls/available/PerformanceNavigation.webidl
new file mode 100644
index 00000000..b7157bd0
--- /dev/null
+++ b/crates/web-sys/webidls/available/PerformanceNavigation.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/hr-time/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface PerformanceNavigation {
+  const unsigned short TYPE_NAVIGATE = 0;
+  const unsigned short TYPE_RELOAD = 1;
+  const unsigned short TYPE_BACK_FORWARD = 2;
+  const unsigned short TYPE_RESERVED = 255;
+
+  readonly attribute unsigned short type;
+  readonly attribute unsigned short redirectCount;
+
+  [Default] object toJSON();
+};
diff --git a/crates/web-sys/webidls/available/PerformanceNavigationTiming.webidl b/crates/web-sys/webidls/available/PerformanceNavigationTiming.webidl
new file mode 100644
index 00000000..fa7da172
--- /dev/null
+++ b/crates/web-sys/webidls/available/PerformanceNavigationTiming.webidl
@@ -0,0 +1,33 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://www.w3.org/TR/navigation-timing-2/#sec-PerformanceNavigationTiming
+ *
+ * Copyright © 2016 W3C® (MIT, ERCIM, Keio, Beihang).
+ * W3C liability, trademark and document use rules apply.
+ */
+
+enum NavigationType {
+  "navigate",
+  "reload",
+  "back_forward",
+  "prerender"
+};
+
+interface PerformanceNavigationTiming : PerformanceResourceTiming {
+  readonly        attribute DOMHighResTimeStamp unloadEventStart;
+  readonly        attribute DOMHighResTimeStamp unloadEventEnd;
+  readonly        attribute DOMHighResTimeStamp domInteractive;
+  readonly        attribute DOMHighResTimeStamp domContentLoadedEventStart;
+  readonly        attribute DOMHighResTimeStamp domContentLoadedEventEnd;
+  readonly        attribute DOMHighResTimeStamp domComplete;
+  readonly        attribute DOMHighResTimeStamp loadEventStart;
+  readonly        attribute DOMHighResTimeStamp loadEventEnd;
+  readonly        attribute NavigationType      type;
+  readonly        attribute unsigned short      redirectCount;
+
+  [Default] object toJSON();
+};
diff --git a/crates/web-sys/webidls/available/PerformanceObserver.webidl b/crates/web-sys/webidls/available/PerformanceObserver.webidl
new file mode 100644
index 00000000..84ecf649
--- /dev/null
+++ b/crates/web-sys/webidls/available/PerformanceObserver.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/performance-timeline/#the-performanceobserver-interface
+ */
+
+dictionary PerformanceObserverInit {
+  required sequence<DOMString> entryTypes;
+  boolean buffered = false;
+};
+
+callback PerformanceObserverCallback = void (PerformanceObserverEntryList entries,
+                                             PerformanceObserver observer);
+
+[Func="mozilla::dom::DOMPrefs::PerformanceObserverEnabled",
+ Constructor(PerformanceObserverCallback callback),
+ Exposed=(Window,Worker)]
+interface PerformanceObserver {
+    void observe(PerformanceObserverInit options);
+    void disconnect();
+    PerformanceEntryList takeRecords();
+};
diff --git a/crates/web-sys/webidls/available/PerformanceObserverEntryList.webidl b/crates/web-sys/webidls/available/PerformanceObserverEntryList.webidl
new file mode 100644
index 00000000..e944535d
--- /dev/null
+++ b/crates/web-sys/webidls/available/PerformanceObserverEntryList.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/performance-timeline/#the-performanceobserverentrylist-interface
+ */
+
+// XXX should be moved into Performance.webidl.
+dictionary PerformanceEntryFilterOptions {
+  DOMString name;
+  DOMString entryType;
+  DOMString initiatorType;
+};
+
+[Func="mozilla::dom::DOMPrefs::PerformanceObserverEnabled",
+ Exposed=(Window,Worker)]
+interface PerformanceObserverEntryList {
+  PerformanceEntryList getEntries(optional PerformanceEntryFilterOptions filter);
+  PerformanceEntryList getEntriesByType(DOMString entryType);
+  PerformanceEntryList getEntriesByName(DOMString name,
+                                        optional DOMString entryType);
+};
+
diff --git a/crates/web-sys/webidls/available/PerformanceResourceTiming.webidl b/crates/web-sys/webidls/available/PerformanceResourceTiming.webidl
new file mode 100644
index 00000000..746718c0
--- /dev/null
+++ b/crates/web-sys/webidls/available/PerformanceResourceTiming.webidl
@@ -0,0 +1,58 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/resource-timing/#performanceresourcetiming
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=(Window,Worker)]
+interface PerformanceResourceTiming : PerformanceEntry
+{
+  readonly attribute DOMString initiatorType;
+  readonly attribute DOMString nextHopProtocol;
+
+  readonly attribute DOMHighResTimeStamp workerStart;
+
+  [NeedsSubjectPrincipal]
+  readonly attribute DOMHighResTimeStamp redirectStart;
+  [NeedsSubjectPrincipal]
+  readonly attribute DOMHighResTimeStamp redirectEnd;
+
+  readonly attribute DOMHighResTimeStamp fetchStart;
+
+  [NeedsSubjectPrincipal]
+  readonly attribute DOMHighResTimeStamp domainLookupStart;
+  [NeedsSubjectPrincipal]
+  readonly attribute DOMHighResTimeStamp domainLookupEnd;
+  [NeedsSubjectPrincipal]
+  readonly attribute DOMHighResTimeStamp connectStart;
+  [NeedsSubjectPrincipal]
+  readonly attribute DOMHighResTimeStamp connectEnd;
+  [NeedsSubjectPrincipal]
+  readonly attribute DOMHighResTimeStamp secureConnectionStart;
+  [NeedsSubjectPrincipal]
+  readonly attribute DOMHighResTimeStamp requestStart;
+  [NeedsSubjectPrincipal]
+  readonly attribute DOMHighResTimeStamp responseStart;
+
+  readonly attribute DOMHighResTimeStamp responseEnd;
+
+  [NeedsSubjectPrincipal]
+  readonly attribute unsigned long long transferSize;
+  [NeedsSubjectPrincipal]
+  readonly attribute unsigned long long encodedBodySize;
+  [NeedsSubjectPrincipal]
+  readonly attribute unsigned long long decodedBodySize;
+
+  // TODO: Use FrozenArray once available. (Bug 1236777)
+  // readonly attribute FrozenArray<PerformanceServerTiming> serverTiming;
+  [SecureContext, Frozen, Cached, Pure, NeedsSubjectPrincipal]
+  readonly attribute sequence<PerformanceServerTiming> serverTiming;
+
+  [Default] object toJSON();
+};
diff --git a/crates/web-sys/webidls/available/PerformanceServerTiming.webidl b/crates/web-sys/webidls/available/PerformanceServerTiming.webidl
new file mode 100644
index 00000000..a31f2da7
--- /dev/null
+++ b/crates/web-sys/webidls/available/PerformanceServerTiming.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/server-timing/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[SecureContext,Exposed=(Window,Worker)]
+interface PerformanceServerTiming {
+  readonly attribute DOMString           name;
+  readonly attribute DOMHighResTimeStamp duration;
+  readonly attribute DOMString           description;
+
+  [Default] object toJSON();
+};
diff --git a/crates/web-sys/webidls/available/PerformanceTiming.webidl b/crates/web-sys/webidls/available/PerformanceTiming.webidl
new file mode 100644
index 00000000..85a8211c
--- /dev/null
+++ b/crates/web-sys/webidls/available/PerformanceTiming.webidl
@@ -0,0 +1,49 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/hr-time/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface PerformanceTiming {
+  readonly attribute unsigned long long navigationStart;
+  readonly attribute unsigned long long unloadEventStart;
+  readonly attribute unsigned long long unloadEventEnd;
+  readonly attribute unsigned long long redirectStart;
+  readonly attribute unsigned long long redirectEnd;
+  readonly attribute unsigned long long fetchStart;
+  readonly attribute unsigned long long domainLookupStart;
+  readonly attribute unsigned long long domainLookupEnd;
+  readonly attribute unsigned long long connectStart;
+  readonly attribute unsigned long long connectEnd;
+  readonly attribute unsigned long long secureConnectionStart;
+  readonly attribute unsigned long long requestStart;
+  readonly attribute unsigned long long responseStart;
+  readonly attribute unsigned long long responseEnd;
+  readonly attribute unsigned long long domLoading;
+  readonly attribute unsigned long long domInteractive;
+  readonly attribute unsigned long long domContentLoadedEventStart;
+  readonly attribute unsigned long long domContentLoadedEventEnd;
+  readonly attribute unsigned long long domComplete;
+  readonly attribute unsigned long long loadEventStart;
+  readonly attribute unsigned long long loadEventEnd;
+
+  // This is a Chrome proprietary extension and not part of the
+  // performance/navigation timing specification.
+  // Returns 0 if a non-blank paint has not happened.
+  [Pref="dom.performance.time_to_non_blank_paint.enabled"]
+  readonly attribute unsigned long long timeToNonBlankPaint;
+
+  // This is a Mozilla proprietary extension and not part of the
+  // performance/navigation timing specification. It marks the
+  // completion of the first presentation flush after DOMContentLoaded.
+  [Pref="dom.performance.time_to_dom_content_flushed.enabled"]
+  readonly attribute unsigned long long timeToDOMContentFlushed;
+
+  [Default] object toJSON();
+};
diff --git a/crates/web-sys/webidls/available/PeriodicWave.webidl b/crates/web-sys/webidls/available/PeriodicWave.webidl
new file mode 100644
index 00000000..b5edb9a4
--- /dev/null
+++ b/crates/web-sys/webidls/available/PeriodicWave.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary PeriodicWaveConstraints {
+  boolean disableNormalization = false;
+};
+
+dictionary PeriodicWaveOptions : PeriodicWaveConstraints {
+             sequence<float> real;
+             sequence<float> imag;
+};
+
+[Pref="dom.webaudio.enabled",
+ // XXXbz The second arg is not optional in the spec, but that looks
+ // like a spec bug to me.  See
+ // <https://github.com/WebAudio/web-audio-api/issues/1116>.
+ Constructor(BaseAudioContext context, optional PeriodicWaveOptions options)]
+interface PeriodicWave {
+};
diff --git a/crates/web-sys/webidls/available/PermissionStatus.webidl b/crates/web-sys/webidls/available/PermissionStatus.webidl
new file mode 100644
index 00000000..3abfd66f
--- /dev/null
+++ b/crates/web-sys/webidls/available/PermissionStatus.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/permissions/#status-of-a-permission
+ */
+
+enum PermissionState {
+  "granted",
+  "denied",
+  "prompt"
+};
+
+[Exposed=(Window)]
+interface PermissionStatus : EventTarget {
+  readonly attribute PermissionState state;
+  attribute EventHandler onchange;
+};
diff --git a/crates/web-sys/webidls/available/Permissions.webidl b/crates/web-sys/webidls/available/Permissions.webidl
new file mode 100644
index 00000000..cf2a59b4
--- /dev/null
+++ b/crates/web-sys/webidls/available/Permissions.webidl
@@ -0,0 +1,31 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/permissions/#permissions-interface
+ */
+
+enum PermissionName {
+  "geolocation",
+  "notifications",
+  "push",
+  "persistent-storage"
+  // Unsupported: "midi"
+};
+
+dictionary PermissionDescriptor {
+  required PermissionName name;
+};
+
+// We don't implement `PushPermissionDescriptor` because we use a background
+// message quota instead of `userVisibleOnly`.
+
+[Exposed=(Window)]
+interface Permissions {
+  [Throws]
+  Promise<PermissionStatus> query(object permission);
+  [Throws, Pref="dom.permissions.revoke.enable"]
+  Promise<PermissionStatus> revoke(object permission);
+};
diff --git a/crates/web-sys/webidls/available/Plugin.webidl b/crates/web-sys/webidls/available/Plugin.webidl
new file mode 100644
index 00000000..2799a205
--- /dev/null
+++ b/crates/web-sys/webidls/available/Plugin.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[LegacyUnenumerableNamedProperties]
+interface Plugin {
+  readonly attribute DOMString description;
+  readonly attribute DOMString filename;
+  readonly attribute DOMString version;
+  readonly attribute DOMString name;
+
+  readonly attribute unsigned long length;
+  getter MimeType? item(unsigned long index);
+  getter MimeType? namedItem(DOMString name);
+};
diff --git a/crates/web-sys/webidls/available/PluginArray.webidl b/crates/web-sys/webidls/available/PluginArray.webidl
new file mode 100644
index 00000000..2ff862bd
--- /dev/null
+++ b/crates/web-sys/webidls/available/PluginArray.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[LegacyUnenumerableNamedProperties]
+interface PluginArray {
+  [NeedsCallerType]
+  readonly attribute unsigned long length;
+
+  [NeedsCallerType]
+  getter Plugin? item(unsigned long index);
+  [NeedsCallerType]
+  getter Plugin? namedItem(DOMString name);
+
+  void refresh(optional boolean reloadDocuments = false);
+};
diff --git a/crates/web-sys/webidls/available/PluginCrashedEvent.webidl b/crates/web-sys/webidls/available/PluginCrashedEvent.webidl
new file mode 100644
index 00000000..8eed7244
--- /dev/null
+++ b/crates/web-sys/webidls/available/PluginCrashedEvent.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Constructor(DOMString type, optional PluginCrashedEventInit eventInitDict), ChromeOnly]
+interface PluginCrashedEvent : Event
+{
+  readonly attribute unsigned long pluginID;
+  readonly attribute DOMString pluginDumpID;
+  readonly attribute DOMString pluginName;
+  readonly attribute DOMString? browserDumpID;
+  readonly attribute DOMString? pluginFilename;
+  readonly attribute boolean submittedCrashReport;
+  readonly attribute boolean gmpPlugin;
+};
+
+dictionary PluginCrashedEventInit : EventInit
+{
+  unsigned long pluginID = 0;
+  DOMString pluginDumpID = "";
+  DOMString pluginName = "";
+  DOMString? browserDumpID = null;
+  DOMString? pluginFilename = null;
+  boolean submittedCrashReport = false;
+  boolean gmpPlugin = false;
+};
diff --git a/crates/web-sys/webidls/available/PointerEvent.webidl b/crates/web-sys/webidls/available/PointerEvent.webidl
new file mode 100644
index 00000000..652451ef
--- /dev/null
+++ b/crates/web-sys/webidls/available/PointerEvent.webidl
@@ -0,0 +1,42 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information see nsIPointerEvent.idl.
+ *
+ * Portions Copyright 2013 Microsoft Open Technologies, Inc. */
+
+interface WindowProxy;
+
+[Pref="dom.w3c_pointer_events.enabled",
+ Constructor(DOMString type, optional PointerEventInit eventInitDict)]
+interface PointerEvent : MouseEvent
+{
+  readonly attribute long pointerId;
+  readonly attribute long width;
+  readonly attribute long height;
+  readonly attribute float pressure;
+  readonly attribute float tangentialPressure;
+  readonly attribute long tiltX;
+  readonly attribute long tiltY;
+  readonly attribute long twist;
+  readonly attribute DOMString pointerType;
+  readonly attribute boolean isPrimary;
+  sequence<PointerEvent> getCoalescedEvents();
+};
+
+dictionary PointerEventInit : MouseEventInit
+{
+  long pointerId = 0;
+  long width = 1;
+  long height = 1;
+  float pressure = 0;
+  float tangentialPressure = 0;
+  long tiltX = 0;
+  long tiltY = 0;
+  long twist = 0;
+  DOMString pointerType = "";
+  boolean isPrimary = false;
+  sequence<PointerEvent> coalescedEvents = [];
+};
diff --git a/crates/web-sys/webidls/available/PopStateEvent.webidl b/crates/web-sys/webidls/available/PopStateEvent.webidl
new file mode 100644
index 00000000..428ab9c8
--- /dev/null
+++ b/crates/web-sys/webidls/available/PopStateEvent.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Constructor(DOMString type, optional PopStateEventInit eventInitDict)]
+interface PopStateEvent : Event
+{
+  readonly attribute any state;
+};
+
+dictionary PopStateEventInit : EventInit
+{
+  any state = null;
+};
diff --git a/crates/web-sys/webidls/available/PopupBlockedEvent.webidl b/crates/web-sys/webidls/available/PopupBlockedEvent.webidl
new file mode 100644
index 00000000..bf338d56
--- /dev/null
+++ b/crates/web-sys/webidls/available/PopupBlockedEvent.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+interface URI;
+
+[Constructor(DOMString type, optional PopupBlockedEventInit eventInitDict)]
+interface PopupBlockedEvent : Event
+{
+  readonly attribute Window? requestingWindow;
+  readonly attribute URI? popupWindowURI;
+  readonly attribute DOMString? popupWindowName;
+  readonly attribute DOMString? popupWindowFeatures;
+};
+
+dictionary PopupBlockedEventInit : EventInit
+{
+  Window? requestingWindow = null;
+  URI? popupWindowURI = null;
+  DOMString popupWindowName = "";
+  DOMString popupWindowFeatures = "";
+};
diff --git a/crates/web-sys/webidls/available/Position.webidl b/crates/web-sys/webidls/available/Position.webidl
new file mode 100644
index 00000000..93812a37
--- /dev/null
+++ b/crates/web-sys/webidls/available/Position.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/geolocation-API
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[NoInterfaceObject]
+interface Position {
+  readonly attribute Coordinates coords;
+  readonly attribute DOMTimeStamp timestamp;
+};
diff --git a/crates/web-sys/webidls/available/PositionError.webidl b/crates/web-sys/webidls/available/PositionError.webidl
new file mode 100644
index 00000000..d644cbe4
--- /dev/null
+++ b/crates/web-sys/webidls/available/PositionError.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/geolocation-API
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[NoInterfaceObject]
+interface PositionError {
+  const unsigned short PERMISSION_DENIED = 1;
+  const unsigned short POSITION_UNAVAILABLE = 2;
+  const unsigned short TIMEOUT = 3;
+  readonly attribute unsigned short code;
+  readonly attribute DOMString message;
+};
diff --git a/crates/web-sys/webidls/available/Presentation.webidl b/crates/web-sys/webidls/available/Presentation.webidl
new file mode 100644
index 00000000..d5b33161
--- /dev/null
+++ b/crates/web-sys/webidls/available/Presentation.webidl
@@ -0,0 +1,30 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/presentation-api/#interface-presentation
+ */
+
+[Pref="dom.presentation.enabled"]
+interface Presentation {
+ /*
+  * This should be used by the UA as the default presentation request for the
+  * controller. When the UA wishes to initiate a PresentationConnection on the
+  * controller's behalf, it MUST start a presentation connection using the default
+  * presentation request (as if the controller had called |defaultRequest.start()|).
+  *
+  * Only used by controlling browsing context (senders).
+  */
+  [Pref="dom.presentation.controller.enabled"]
+  attribute PresentationRequest? defaultRequest;
+
+  /*
+   * This should be available on the receiving browsing context in order to
+   * access the controlling browsing context and communicate with them.
+   */
+  [SameObject,
+   Pref="dom.presentation.receiver.enabled"]
+  readonly attribute PresentationReceiver? receiver;
+};
diff --git a/crates/web-sys/webidls/available/PresentationAvailability.webidl b/crates/web-sys/webidls/available/PresentationAvailability.webidl
new file mode 100644
index 00000000..f72b8856
--- /dev/null
+++ b/crates/web-sys/webidls/available/PresentationAvailability.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/presentation-api/#interface-presentationavailability
+ */
+
+[Pref="dom.presentation.controller.enabled"]
+interface PresentationAvailability : EventTarget {
+  /*
+   * If there is at least one device discovered by UA, the value is |true|.
+   * Otherwise, its value should be |false|.
+   */
+  readonly attribute boolean value;
+
+  /*
+   * It is called when device availability changes.
+   */
+  attribute EventHandler onchange;
+};
diff --git a/crates/web-sys/webidls/available/PresentationConnection.webidl b/crates/web-sys/webidls/available/PresentationConnection.webidl
new file mode 100644
index 00000000..9676d206
--- /dev/null
+++ b/crates/web-sys/webidls/available/PresentationConnection.webidl
@@ -0,0 +1,96 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/presentation-api/#interface-presentationconnection
+ */
+
+enum PresentationConnectionState
+{
+  // The initial state when a PresentationConnection is ceated.
+  "connecting",
+
+  // Existing presentation, and the communication channel is active.
+  "connected",
+
+  // Existing presentation, but the communication channel is inactive.
+  "closed",
+
+  // The presentation is nonexistent anymore. It could be terminated manually,
+  // or either controlling or receiving browsing context is no longer available.
+  "terminated"
+};
+
+enum PresentationConnectionBinaryType
+{
+  "blob",
+  "arraybuffer"
+};
+
+[Pref="dom.presentation.enabled"]
+interface PresentationConnection : EventTarget {
+  /*
+   * Unique id for all existing connections.
+   */
+  [Constant]
+  readonly attribute DOMString id;
+
+  /*
+   * Specifies the connection's presentation URL.
+   */
+  readonly attribute DOMString url;
+
+  /*
+   * @value "connected", "closed", or "terminated".
+   */
+  readonly attribute PresentationConnectionState state;
+
+  attribute EventHandler onconnect;
+  attribute EventHandler onclose;
+  attribute EventHandler onterminate;
+  attribute PresentationConnectionBinaryType binaryType;
+
+  /*
+   * After a communication channel has been established between the controlling
+   * and receiving context, this function is called to send message out, and the
+   * event handler "onmessage" will be invoked at the remote side.
+   *
+   * This function only works when the state is "connected".
+   */
+  [Throws]
+  void send(DOMString data);
+
+  [Throws]
+  void send(Blob data);
+
+  [Throws]
+  void send(ArrayBuffer data);
+
+  [Throws]
+  void send(ArrayBufferView data);
+
+  /*
+   * It is triggered when receiving messages.
+   */
+  attribute EventHandler onmessage;
+
+  /*
+   * Both the controlling and receiving browsing context can close the
+   * connection. Then the connection state should turn into "closed".
+   *
+   * This function only works when the state is "connected" or "connecting".
+   */
+  [Throws]
+  void close();
+
+  /*
+   * Both the controlling and receiving browsing context can terminate the
+   * connection. Then the connection state should turn into "terminated".
+   *
+   * This function only works when the state is not "connected".
+   */
+   [Throws]
+   void terminate();
+};
diff --git a/crates/web-sys/webidls/available/PresentationConnectionAvailableEvent.webidl b/crates/web-sys/webidls/available/PresentationConnectionAvailableEvent.webidl
new file mode 100644
index 00000000..9efecb7d
--- /dev/null
+++ b/crates/web-sys/webidls/available/PresentationConnectionAvailableEvent.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/presentation-api/#interface-presentationconnectionavailableevent
+ */
+
+[Constructor(DOMString type,
+             PresentationConnectionAvailableEventInit eventInitDict),
+ Pref="dom.presentation.enabled"]
+interface PresentationConnectionAvailableEvent : Event
+{
+  [SameObject]
+  readonly attribute PresentationConnection connection;
+};
+
+dictionary PresentationConnectionAvailableEventInit : EventInit
+{
+  required PresentationConnection connection;
+};
diff --git a/crates/web-sys/webidls/available/PresentationConnectionCloseEvent.webidl b/crates/web-sys/webidls/available/PresentationConnectionCloseEvent.webidl
new file mode 100644
index 00000000..da6c2554
--- /dev/null
+++ b/crates/web-sys/webidls/available/PresentationConnectionCloseEvent.webidl
@@ -0,0 +1,41 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/presentation-api/#interface-presentationconnectioncloseevent
+ */
+
+enum PresentationConnectionClosedReason
+{
+  // The communication encountered an unrecoverable error.
+  "error",
+
+  // |PresentationConnection.close()| is called by controlling browsing context
+  // or the receiving browsing context.
+  "closed",
+
+  // The connection is closed because the destination browsing context
+  // that owned the connection navigated or was discarded.
+  "wentaway"
+};
+
+[Constructor(DOMString type,
+             PresentationConnectionCloseEventInit eventInitDict),
+ Pref="dom.presentation.enabled"]
+interface PresentationConnectionCloseEvent : Event
+{
+  readonly attribute PresentationConnectionClosedReason reason;
+
+  // The message is a human readable description of
+  // how the communication channel encountered an error.
+  // It is empty when the closed reason is closed or wentaway.
+  readonly attribute DOMString message;
+};
+
+dictionary PresentationConnectionCloseEventInit : EventInit
+{
+  required PresentationConnectionClosedReason reason;
+  DOMString message = "";
+};
diff --git a/crates/web-sys/webidls/available/PresentationConnectionList.webidl b/crates/web-sys/webidls/available/PresentationConnectionList.webidl
new file mode 100644
index 00000000..2c90ce9d
--- /dev/null
+++ b/crates/web-sys/webidls/available/PresentationConnectionList.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/presentation-api/#interface-presentationconnectionlist
+ */
+
+[Pref="dom.presentation.receiver.enabled"]
+interface PresentationConnectionList : EventTarget {
+  /*
+   * Return the non-terminated set of presentation connections in the
+   * set of presentation controllers.
+   * TODO: Use FrozenArray once available. (Bug 1236777)
+   * readonly attribute FrozenArray<PresentationConnection> connections;
+   */
+  [Frozen, Cached, Pure]
+  readonly attribute sequence<PresentationConnection> connections;
+
+  /*
+   * It is called when an incoming connection is connected.
+   */
+  attribute EventHandler onconnectionavailable;
+};
diff --git a/crates/web-sys/webidls/available/PresentationReceiver.webidl b/crates/web-sys/webidls/available/PresentationReceiver.webidl
new file mode 100644
index 00000000..0fa51c15
--- /dev/null
+++ b/crates/web-sys/webidls/available/PresentationReceiver.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/presentation-api/#interface-presentationreceiver
+ */
+
+[Pref="dom.presentation.receiver.enabled"]
+interface PresentationReceiver {
+  /*
+   * Get a list which contains all connected presentation connections
+   * in a receiving browsing context.
+   */
+  [Throws]
+  readonly attribute Promise<PresentationConnectionList> connectionList;
+};
diff --git a/crates/web-sys/webidls/available/PresentationRequest.webidl b/crates/web-sys/webidls/available/PresentationRequest.webidl
new file mode 100644
index 00000000..c0c5fb8a
--- /dev/null
+++ b/crates/web-sys/webidls/available/PresentationRequest.webidl
@@ -0,0 +1,86 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/presentation-api/#interface-presentationrequest
+ */
+
+[Constructor(DOMString url),
+ Constructor(sequence<DOMString> urls),
+ Pref="dom.presentation.controller.enabled"]
+interface PresentationRequest : EventTarget {
+  /*
+   * A requesting page use start() to start a new connection, and it will be
+   * returned with the promise. UA may show a prompt box with a list of
+   * available devices and ask the user to grant permission, choose a device, or
+   * cancel the operation.
+   *
+   * The promise is resolved when the presenting page is successfully loaded and
+   * the communication channel is established, i.e., the connection state is
+   * "connected".
+   *
+   * The promise may be rejected duo to one of the following reasons:
+   * - "OperationError": Unexpected error occurs.
+   * - "NotFoundError":  No available device.
+   * - "AbortError":     User dismiss/cancel the device prompt box.
+   * - "NetworkError":   Failed to establish the control channel or data channel.
+   * - "TimeoutError":   Presenting page takes too long to load.
+   * - "SecurityError":  This operation is insecure.
+   */
+  [Throws]
+  Promise<PresentationConnection> start();
+
+  /*
+   * A requesting page can use reconnect(presentationId) to reopen a
+   * non-terminated presentation connection.
+   *
+   * The promise is resolved when a new presentation connection is created.
+   * The connection state is "connecting".
+   *
+   * The promise may be rejected duo to one of the following reasons:
+   * - "OperationError": Unexpected error occurs.
+   * - "NotFoundError":  Can not find a presentation connection with the presentationId.
+   * - "SecurityError":  This operation is insecure.
+   */
+  [Throws]
+  Promise<PresentationConnection> reconnect(DOMString presentationId);
+
+ /*
+  * UA triggers device discovery mechanism periodically and monitor device
+  * availability.
+  *
+  * The promise may be rejected duo to one of the following reasons:
+  * - "NotSupportedError": Unable to continuously monitor the availability.
+  * - "SecurityError":  This operation is insecure.
+  */
+  [Throws]
+  Promise<PresentationAvailability> getAvailability();
+
+  /*
+   * It is called when a connection associated with a PresentationRequest is created.
+   * The event is fired for all connections that are created for the controller.
+   */
+  attribute EventHandler onconnectionavailable;
+
+  /*
+   * A chrome page, or page which has presentation-device-manage permissiongs,
+   * uses startWithDevice() to start a new connection with specified device,
+   * and it will be returned with the promise. UA may show a prompt box with a
+   * list of available devices and ask the user to grant permission, choose a
+   * device, or cancel the operation.
+   *
+   * The promise is resolved when the presenting page is successfully loaded and
+   * the communication channel is established, i.e., the connection state is
+   * "connected".
+   *
+   * The promise may be rejected duo to one of the following reasons:
+   * - "OperationError": Unexpected error occurs.
+   * - "NotFoundError":  No available device.
+   * - "NetworkError":   Failed to establish the control channel or data channel.
+   * - "TimeoutError":   Presenting page takes too long to load.
+   */
+  [ChromeOnly, Throws]
+  Promise<PresentationConnection> startWithDevice(DOMString deviceId);
+};
diff --git a/crates/web-sys/webidls/available/ProcessingInstruction.webidl b/crates/web-sys/webidls/available/ProcessingInstruction.webidl
new file mode 100644
index 00000000..40b001ae
--- /dev/null
+++ b/crates/web-sys/webidls/available/ProcessingInstruction.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dom.spec.whatwg.org/#interface-processinginstruction
+ * https://drafts.csswg.org/cssom/#requirements-on-user-agents-implementing-the-xml-stylesheet-processing-instruction
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+// https://dom.spec.whatwg.org/#interface-processinginstruction
+interface ProcessingInstruction : CharacterData {
+  readonly attribute DOMString target;
+};
+
+// https://drafts.csswg.org/cssom/#requirements-on-user-agents-implementing-the-xml-stylesheet-processing-instruction
+ProcessingInstruction implements LinkStyle;
diff --git a/crates/web-sys/webidls/available/ProfileTimelineMarker.webidl b/crates/web-sys/webidls/available/ProfileTimelineMarker.webidl
new file mode 100644
index 00000000..24f3f9e0
--- /dev/null
+++ b/crates/web-sys/webidls/available/ProfileTimelineMarker.webidl
@@ -0,0 +1,74 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+// For Javascript markers, the |stack| of a ProfileTimelineMarker
+// holds an object of this type.  It intentionally looks like a
+// SavedStack object and is a representation of the frame that is
+// about to be constructed at the entry point.
+dictionary ProfileTimelineStackFrame {
+  long line;
+  long column = 0;
+  DOMString source;
+  DOMString functionDisplayName;
+  object? parent = null;
+  object? asyncParent = null;
+  DOMString asyncCause;
+};
+
+dictionary ProfileTimelineLayerRect {
+  long x = 0;
+  long y = 0;
+  long width = 0;
+  long height = 0;
+};
+
+enum ProfileTimelineMessagePortOperationType {
+  "serializeData",
+  "deserializeData",
+};
+
+enum ProfileTimelineWorkerOperationType {
+  "serializeDataOffMainThread",
+  "serializeDataOnMainThread",
+  "deserializeDataOffMainThread",
+  "deserializeDataOnMainThread",
+};
+
+dictionary ProfileTimelineMarker {
+  DOMString name = "";
+  DOMHighResTimeStamp start = 0;
+  DOMHighResTimeStamp end = 0;
+  object? stack = null;
+
+  unsigned short processType;
+  boolean isOffMainThread;
+
+  /* For ConsoleTime, Timestamp and Javascript markers.  */
+  DOMString causeName;
+
+  /* For ConsoleTime markers.  */
+  object? endStack = null;
+
+  /* For DOMEvent markers.  */
+  DOMString type;
+  unsigned short eventPhase;
+
+  /* For document::DOMContentLoaded and document::Load markers. Using this
+   * instead of the `start` and `end` timestamps is strongly discouraged. */
+  unsigned long long unixTime; // in microseconds
+
+  /* For Paint markers.  */
+  sequence<ProfileTimelineLayerRect> rectangles;
+
+  /* For Style markers. */
+  boolean isAnimationOnly;
+
+  /* For MessagePort markers. */
+  ProfileTimelineMessagePortOperationType messagePortOperation;
+
+  /* For Worker markers. */
+  ProfileTimelineWorkerOperationType workerOperation;
+};
diff --git a/crates/web-sys/webidls/available/ProgressEvent.webidl b/crates/web-sys/webidls/available/ProgressEvent.webidl
new file mode 100644
index 00000000..c2ecf579
--- /dev/null
+++ b/crates/web-sys/webidls/available/ProgressEvent.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Constructor(DOMString type, optional ProgressEventInit eventInitDict),
+ Exposed=(Window,Worker)]
+interface ProgressEvent : Event
+{
+  readonly attribute boolean lengthComputable;
+  readonly attribute unsigned long long loaded;
+  readonly attribute unsigned long long total;
+};
+
+dictionary ProgressEventInit : EventInit
+{
+  boolean lengthComputable = false;
+  unsigned long long loaded = 0;
+  unsigned long long total = 0;
+};
diff --git a/crates/web-sys/webidls/available/Promise.webidl b/crates/web-sys/webidls/available/Promise.webidl
new file mode 100644
index 00000000..a296553d
--- /dev/null
+++ b/crates/web-sys/webidls/available/Promise.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This IDL file contains utilities to help connect JS promises to our
+ * Web IDL infrastructure.
+ */
+
+callback PromiseJobCallback = void();
+
+[TreatNonCallableAsNull]
+callback AnyCallback = any (any value);
+
+// Hack to allow us to have JS owning and properly tracing/CCing/etc a
+// PromiseNativeHandler.
+[NoInterfaceObject,
+ Exposed=(Window,Worker,System)]
+interface PromiseNativeHandler {
+};
diff --git a/crates/web-sys/webidls/available/PromiseRejectionEvent.webidl b/crates/web-sys/webidls/available/PromiseRejectionEvent.webidl
new file mode 100644
index 00000000..a341794c
--- /dev/null
+++ b/crates/web-sys/webidls/available/PromiseRejectionEvent.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Constructor(DOMString type, PromiseRejectionEventInit eventInitDict),
+ Exposed=(Window,Worker),
+ Func="mozilla::dom::DOMPrefs::PromiseRejectionEventsEnabled"]
+interface PromiseRejectionEvent : Event
+{
+  [BinaryName="rejectedPromise"]
+  readonly attribute Promise<any> promise;
+  readonly attribute any reason;
+};
+
+dictionary PromiseRejectionEventInit : EventInit {
+  required Promise<any> promise;
+           any reason;
+};
diff --git a/crates/web-sys/webidls/available/PushEvent.webidl b/crates/web-sys/webidls/available/PushEvent.webidl
new file mode 100644
index 00000000..269b3699
--- /dev/null
+++ b/crates/web-sys/webidls/available/PushEvent.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/push-api/
+ */
+
+[Constructor(DOMString type, optional PushEventInit eventInitDict),
+ Func="mozilla::dom::DOMPrefs::PushEnabled",
+ Exposed=ServiceWorker]
+interface PushEvent : ExtendableEvent {
+  readonly attribute PushMessageData? data;
+};
+
+typedef (BufferSource or USVString) PushMessageDataInit;
+
+dictionary PushEventInit : ExtendableEventInit {
+  PushMessageDataInit data;
+};
diff --git a/crates/web-sys/webidls/available/PushManager.webidl b/crates/web-sys/webidls/available/PushManager.webidl
new file mode 100644
index 00000000..7c8c6628
--- /dev/null
+++ b/crates/web-sys/webidls/available/PushManager.webidl
@@ -0,0 +1,41 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+* License, v. 2.0. If a copy of the MPL was not distributed with this file,
+* You can obtain one at http://mozilla.org/MPL/2.0/.
+*
+* The origin of this IDL file is
+* https://w3c.github.io/push-api/
+*/
+
+dictionary PushSubscriptionOptionsInit {
+  // boolean userVisibleOnly = false;
+  (BufferSource or DOMString)? applicationServerKey = null;
+};
+
+// The main thread JS implementation. Please see comments in
+// dom/push/PushManager.h for the split between PushManagerImpl and PushManager.
+[JSImplementation="@mozilla.org/push/PushManager;1",
+ ChromeOnly, Constructor(DOMString scope)]
+interface PushManagerImpl {
+  Promise<PushSubscription>    subscribe(optional PushSubscriptionOptionsInit options);
+  Promise<PushSubscription?>   getSubscription();
+  Promise<PushPermissionState> permissionState(optional PushSubscriptionOptionsInit options);
+};
+
+[Exposed=(Window,Worker), Func="mozilla::dom::DOMPrefs::PushEnabled",
+ ChromeConstructor(DOMString scope)]
+interface PushManager {
+  [Throws, UseCounter]
+  Promise<PushSubscription>    subscribe(optional PushSubscriptionOptionsInit options);
+  [Throws]
+  Promise<PushSubscription?>   getSubscription();
+  [Throws]
+  Promise<PushPermissionState> permissionState(optional PushSubscriptionOptionsInit options);
+};
+
+enum PushPermissionState
+{
+    "granted",
+    "denied",
+    "prompt"
+};
diff --git a/crates/web-sys/webidls/available/PushMessageData.webidl b/crates/web-sys/webidls/available/PushMessageData.webidl
new file mode 100644
index 00000000..ca329203
--- /dev/null
+++ b/crates/web-sys/webidls/available/PushMessageData.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/push-api/
+ */
+
+[Func="mozilla::dom::DOMPrefs::PushEnabled",
+ Exposed=ServiceWorker]
+interface PushMessageData
+{
+    [Throws]
+    ArrayBuffer arrayBuffer();
+    [Throws]
+    Blob        blob();
+    [Throws]
+    any         json();
+    USVString   text();
+};
diff --git a/crates/web-sys/webidls/available/PushSubscription.webidl b/crates/web-sys/webidls/available/PushSubscription.webidl
new file mode 100644
index 00000000..6603af02
--- /dev/null
+++ b/crates/web-sys/webidls/available/PushSubscription.webidl
@@ -0,0 +1,53 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+* License, v. 2.0. If a copy of the MPL was not distributed with this file,
+* You can obtain one at http://mozilla.org/MPL/2.0/.
+*
+* The origin of this IDL file is
+* https://w3c.github.io/push-api/
+*/
+
+interface Principal;
+
+enum PushEncryptionKeyName
+{
+  "p256dh",
+  "auth"
+};
+
+dictionary PushSubscriptionKeys
+{
+  ByteString p256dh;
+  ByteString auth;
+};
+
+dictionary PushSubscriptionJSON
+{
+  USVString endpoint;
+  PushSubscriptionKeys keys;
+};
+
+dictionary PushSubscriptionInit
+{
+  required USVString endpoint;
+  required USVString scope;
+  ArrayBuffer? p256dhKey;
+  ArrayBuffer? authSecret;
+  BufferSource? appServerKey;
+};
+
+[Exposed=(Window,Worker), Func="mozilla::dom::DOMPrefs::PushEnabled",
+ ChromeConstructor(PushSubscriptionInit initDict)]
+interface PushSubscription
+{
+  readonly attribute USVString endpoint;
+  readonly attribute PushSubscriptionOptions options;
+  [Throws]
+  ArrayBuffer? getKey(PushEncryptionKeyName name);
+  [Throws, UseCounter]
+  Promise<boolean> unsubscribe();
+
+  // Implements the custom serializer specified in Push API, section 9.
+  [Throws]
+  PushSubscriptionJSON toJSON();
+};
diff --git a/crates/web-sys/webidls/available/PushSubscriptionOptions.webidl b/crates/web-sys/webidls/available/PushSubscriptionOptions.webidl
new file mode 100644
index 00000000..5ffd0e75
--- /dev/null
+++ b/crates/web-sys/webidls/available/PushSubscriptionOptions.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+* License, v. 2.0. If a copy of the MPL was not distributed with this file,
+* You can obtain one at http://mozilla.org/MPL/2.0/.
+*
+* The origin of this IDL file is
+* https://w3c.github.io/push-api/
+*/
+
+[Exposed=(Window,Worker), Func="mozilla::dom::DOMPrefs::PushEnabled"]
+interface PushSubscriptionOptions
+{
+  [SameObject, Throws]
+  readonly attribute ArrayBuffer? applicationServerKey;
+};
diff --git a/crates/web-sys/webidls/available/RTCCertificate.webidl b/crates/web-sys/webidls/available/RTCCertificate.webidl
new file mode 100644
index 00000000..40585951
--- /dev/null
+++ b/crates/web-sys/webidls/available/RTCCertificate.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * Specification: http://w3c.github.io/webrtc-pc/#certificate-management
+ */
+
+dictionary RTCCertificateExpiration {
+  [EnforceRange]
+  DOMTimeStamp expires;
+};
+
+[Pref="media.peerconnection.enabled"]
+interface RTCCertificate {
+  readonly attribute DOMTimeStamp expires;
+};
diff --git a/crates/web-sys/webidls/available/RTCConfiguration.webidl b/crates/web-sys/webidls/available/RTCConfiguration.webidl
new file mode 100644
index 00000000..2c4052b8
--- /dev/null
+++ b/crates/web-sys/webidls/available/RTCConfiguration.webidl
@@ -0,0 +1,40 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2011/webrtc/editor/webrtc.html#idl-def-RTCConfiguration
+ */
+
+enum RTCIceCredentialType {
+    "password",
+    "token"
+};
+
+dictionary RTCIceServer {
+    (DOMString or sequence<DOMString>) urls;
+    DOMString  url; //deprecated
+    DOMString username;
+    DOMString credential;
+    RTCIceCredentialType credentialType = "password";
+};
+
+enum RTCIceTransportPolicy {
+    "relay",
+    "all"
+};
+
+enum RTCBundlePolicy {
+    "balanced",
+    "max-compat",
+    "max-bundle"
+};
+
+dictionary RTCConfiguration {
+    sequence<RTCIceServer> iceServers;
+    RTCIceTransportPolicy  iceTransportPolicy = "all";
+    RTCBundlePolicy bundlePolicy = "balanced";
+    DOMString? peerIdentity = null;
+    sequence<RTCCertificate> certificates;
+};
diff --git a/crates/web-sys/webidls/available/RTCDTMFSender.webidl b/crates/web-sys/webidls/available/RTCDTMFSender.webidl
new file mode 100644
index 00000000..bf601a12
--- /dev/null
+++ b/crates/web-sys/webidls/available/RTCDTMFSender.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://www.w3.org/TR/webrtc/#rtcdtmfsender
+ */
+
+[JSImplementation="@mozilla.org/dom/rtcdtmfsender;1"]
+interface RTCDTMFSender : EventTarget {
+    void insertDTMF(DOMString tones,
+                    optional unsigned long duration = 100,
+                    optional unsigned long interToneGap = 70);
+             attribute EventHandler  ontonechange;
+    readonly attribute DOMString     toneBuffer;
+};
diff --git a/crates/web-sys/webidls/available/RTCDTMFToneChangeEvent.webidl b/crates/web-sys/webidls/available/RTCDTMFToneChangeEvent.webidl
new file mode 100644
index 00000000..8cdae159
--- /dev/null
+++ b/crates/web-sys/webidls/available/RTCDTMFToneChangeEvent.webidl
@@ -0,0 +1,8 @@
+[Constructor(DOMString type, optional RTCDTMFToneChangeEventInit eventInitDict)]
+interface RTCDTMFToneChangeEvent : Event {
+    readonly attribute DOMString tone;
+};
+
+dictionary RTCDTMFToneChangeEventInit : EventInit {
+    DOMString tone = "";
+};
diff --git a/crates/web-sys/webidls/available/RTCDataChannel.webidl b/crates/web-sys/webidls/available/RTCDataChannel.webidl
new file mode 100644
index 00000000..2ded0ce4
--- /dev/null
+++ b/crates/web-sys/webidls/available/RTCDataChannel.webidl
@@ -0,0 +1,49 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+enum RTCDataChannelState {
+  "connecting",
+  "open",
+  "closing",
+  "closed"
+};
+
+enum RTCDataChannelType {
+  "arraybuffer",
+  "blob"
+};
+
+interface RTCDataChannel : EventTarget
+{
+  readonly attribute DOMString label;
+  readonly attribute boolean reliable;
+  readonly attribute unsigned short? maxPacketLifeTime;
+  readonly attribute unsigned short? maxRetransmits;
+  readonly attribute RTCDataChannelState readyState;
+  readonly attribute unsigned long bufferedAmount;
+  attribute unsigned long bufferedAmountLowThreshold;
+  attribute EventHandler onopen;
+  attribute EventHandler onerror;
+  attribute EventHandler onclose;
+  void close();
+  attribute EventHandler onmessage;
+  attribute EventHandler onbufferedamountlow;
+  attribute RTCDataChannelType binaryType;
+  [Throws]
+  void send(DOMString data);
+  [Throws]
+  void send(Blob data);
+  [Throws]
+  void send(ArrayBuffer data);
+  [Throws]
+  void send(ArrayBufferView data);
+};
+
+// Mozilla extensions.
+partial interface RTCDataChannel
+{
+  readonly attribute DOMString protocol;
+  readonly attribute boolean ordered;
+  readonly attribute unsigned short id;
+};
diff --git a/crates/web-sys/webidls/available/RTCDataChannelEvent.webidl b/crates/web-sys/webidls/available/RTCDataChannelEvent.webidl
new file mode 100644
index 00000000..9eba3824
--- /dev/null
+++ b/crates/web-sys/webidls/available/RTCDataChannelEvent.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2011/webrtc/editor/webrtc.html#idl-def-RTCDataChannelEvent
+ */
+
+dictionary RTCDataChannelEventInit : EventInit {
+    required RTCDataChannel channel;
+};
+
+[Pref="media.peerconnection.enabled",
+ Constructor(DOMString type, RTCDataChannelEventInit eventInitDict)]
+interface RTCDataChannelEvent : Event {
+  readonly attribute RTCDataChannel channel;
+};
diff --git a/crates/web-sys/webidls/available/RTCIceCandidate.webidl b/crates/web-sys/webidls/available/RTCIceCandidate.webidl
new file mode 100644
index 00000000..2e425f39
--- /dev/null
+++ b/crates/web-sys/webidls/available/RTCIceCandidate.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2011/webrtc/editor/webrtc.html#idl-def-RTCIceCandidate
+ */
+
+dictionary RTCIceCandidateInit {
+  required DOMString candidate;
+  DOMString? sdpMid = null;
+  unsigned short? sdpMLineIndex = null;
+};
+
+[Pref="media.peerconnection.enabled",
+ JSImplementation="@mozilla.org/dom/rtcicecandidate;1",
+ Constructor(RTCIceCandidateInit candidateInitDict)]
+interface RTCIceCandidate {
+  attribute DOMString       candidate;
+  attribute DOMString?      sdpMid;
+  attribute unsigned short? sdpMLineIndex;
+
+  [Default] object toJSON();
+};
diff --git a/crates/web-sys/webidls/available/RTCIdentityAssertion.webidl b/crates/web-sys/webidls/available/RTCIdentityAssertion.webidl
new file mode 100644
index 00000000..621b21fe
--- /dev/null
+++ b/crates/web-sys/webidls/available/RTCIdentityAssertion.webidl
@@ -0,0 +1,13 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://w3c.github.io/webrtc-pc/#idl-def-RTCIdentityAssertion
+ */
+
+dictionary RTCIdentityAssertion {
+  DOMString idp;
+  DOMString name;
+};
diff --git a/crates/web-sys/webidls/available/RTCIdentityProvider.webidl b/crates/web-sys/webidls/available/RTCIdentityProvider.webidl
new file mode 100644
index 00000000..8717ea25
--- /dev/null
+++ b/crates/web-sys/webidls/available/RTCIdentityProvider.webidl
@@ -0,0 +1,65 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * http://w3c.github.io/webrtc-pc/ (with https://github.com/w3c/webrtc-pc/pull/178)
+ */
+
+[NoInterfaceObject]
+interface RTCIdentityProviderRegistrar {
+  void register(RTCIdentityProvider idp);
+
+  /* Whether an IdP was passed to register() to chrome code. */
+  [ChromeOnly]
+  readonly attribute boolean hasIdp;
+  /* The following two chrome-only functions forward to the corresponding
+   * function on the registered IdP.  This is necessary because the
+   * JS-implemented WebIDL can't see these functions on `idp` above, chrome JS
+   * gets an Xray onto the content code that suppresses functions, see
+   * https://developer.mozilla.org/en-US/docs/Xray_vision#Xrays_for_JavaScript_objects
+   */
+  /* Forward to idp.generateAssertion() */
+  [ChromeOnly, Throws]
+  Promise<RTCIdentityAssertionResult>
+  generateAssertion(DOMString contents, DOMString origin,
+                    optional RTCIdentityProviderOptions options);
+  /* Forward to idp.validateAssertion() */
+  [ChromeOnly, Throws]
+  Promise<RTCIdentityValidationResult>
+  validateAssertion(DOMString assertion, DOMString origin);
+};
+
+dictionary RTCIdentityProvider {
+  required GenerateAssertionCallback generateAssertion;
+  required ValidateAssertionCallback validateAssertion;
+};
+
+callback GenerateAssertionCallback =
+  Promise<RTCIdentityAssertionResult>
+    (DOMString contents, DOMString origin,
+     RTCIdentityProviderOptions options);
+callback ValidateAssertionCallback =
+  Promise<RTCIdentityValidationResult> (DOMString assertion, DOMString origin);
+
+dictionary RTCIdentityAssertionResult {
+  required RTCIdentityProviderDetails idp;
+  required DOMString assertion;
+};
+
+dictionary RTCIdentityProviderDetails {
+  required DOMString domain;
+  DOMString protocol = "default";
+};
+
+dictionary RTCIdentityValidationResult {
+  required DOMString identity;
+  required DOMString contents;
+};
+
+dictionary RTCIdentityProviderOptions {
+  DOMString protocol = "default";
+  DOMString usernameHint;
+  DOMString peerIdentity;
+};
+
diff --git a/crates/web-sys/webidls/available/RTCPeerConnection.webidl b/crates/web-sys/webidls/available/RTCPeerConnection.webidl
new file mode 100644
index 00000000..ab935f1a
--- /dev/null
+++ b/crates/web-sys/webidls/available/RTCPeerConnection.webidl
@@ -0,0 +1,203 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://w3c.github.io/webrtc-pc/#interface-definition
+ */
+
+callback RTCSessionDescriptionCallback = void (RTCSessionDescriptionInit description);
+callback RTCPeerConnectionErrorCallback = void (DOMException error);
+callback RTCStatsCallback = void (RTCStatsReport report);
+
+enum RTCSignalingState {
+    "stable",
+    "have-local-offer",
+    "have-remote-offer",
+    "have-local-pranswer",
+    "have-remote-pranswer",
+    "closed"
+};
+
+enum RTCIceGatheringState {
+    "new",
+    "gathering",
+    "complete"
+};
+
+enum RTCIceConnectionState {
+    "new",
+    "checking",
+    "connected",
+    "completed",
+    "failed",
+    "disconnected",
+    "closed"
+};
+
+enum mozPacketDumpType {
+  "rtp", // dump unencrypted rtp as the MediaPipeline sees it
+  "srtp", // dump encrypted rtp as the MediaPipeline sees it
+  "rtcp", // dump unencrypted rtcp as the MediaPipeline sees it
+  "srtcp" // dump encrypted rtcp as the MediaPipeline sees it
+};
+
+callback mozPacketCallback = void (unsigned long level,
+                                   mozPacketDumpType type,
+                                   boolean sending,
+                                   ArrayBuffer packet);
+
+dictionary RTCDataChannelInit {
+  boolean        ordered = true;
+  unsigned short maxPacketLifeTime;
+  unsigned short maxRetransmits;
+  DOMString      protocol = "";
+  boolean        negotiated = false;
+  unsigned short id;
+
+  // These are deprecated due to renaming in the spec, but still supported for Fx53
+  unsigned short maxRetransmitTime;
+};
+
+dictionary RTCOfferAnswerOptions {
+//  boolean voiceActivityDetection = true; // TODO: support this (Bug 1184712)
+};
+
+dictionary RTCAnswerOptions : RTCOfferAnswerOptions {
+};
+
+dictionary RTCOfferOptions : RTCOfferAnswerOptions {
+  boolean offerToReceiveVideo;
+  boolean offerToReceiveAudio;
+  boolean iceRestart = false;
+};
+
+[Pref="media.peerconnection.enabled",
+ JSImplementation="@mozilla.org/dom/peerconnection;1",
+ Constructor (optional RTCConfiguration configuration,
+              optional object? constraints)]
+interface RTCPeerConnection : EventTarget  {
+  [Throws, StaticClassOverride="mozilla::dom::RTCCertificate"]
+  static Promise<RTCCertificate> generateCertificate (AlgorithmIdentifier keygenAlgorithm);
+
+  [Pref="media.peerconnection.identity.enabled"]
+  void setIdentityProvider (DOMString provider,
+                            optional RTCIdentityProviderOptions options);
+  [Pref="media.peerconnection.identity.enabled"]
+  Promise<DOMString> getIdentityAssertion();
+  Promise<RTCSessionDescriptionInit> createOffer (optional RTCOfferOptions options);
+  Promise<RTCSessionDescriptionInit> createAnswer (optional RTCAnswerOptions options);
+  Promise<void> setLocalDescription (RTCSessionDescriptionInit description);
+  Promise<void> setRemoteDescription (RTCSessionDescriptionInit description);
+  readonly attribute RTCSessionDescription? localDescription;
+  readonly attribute RTCSessionDescription? currentLocalDescription;
+  readonly attribute RTCSessionDescription? pendingLocalDescription;
+  readonly attribute RTCSessionDescription? remoteDescription;
+  readonly attribute RTCSessionDescription? currentRemoteDescription;
+  readonly attribute RTCSessionDescription? pendingRemoteDescription;
+  readonly attribute RTCSignalingState signalingState;
+  Promise<void> addIceCandidate ((RTCIceCandidateInit or RTCIceCandidate)? candidate);
+  readonly attribute boolean? canTrickleIceCandidates;
+  readonly attribute RTCIceGatheringState iceGatheringState;
+  readonly attribute RTCIceConnectionState iceConnectionState;
+  [Pref="media.peerconnection.identity.enabled"]
+  readonly attribute Promise<RTCIdentityAssertion> peerIdentity;
+  [Pref="media.peerconnection.identity.enabled"]
+  readonly attribute DOMString? idpLoginUrl;
+
+  [ChromeOnly]
+  attribute DOMString id;
+
+  RTCConfiguration      getConfiguration ();
+  [Deprecated="RTCPeerConnectionGetStreams"]
+  sequence<MediaStream> getLocalStreams ();
+  [Deprecated="RTCPeerConnectionGetStreams"]
+  sequence<MediaStream> getRemoteStreams ();
+  void addStream (MediaStream stream);
+
+  // replaces addStream; fails if already added
+  // because a track can be part of multiple streams, stream parameters
+  // indicate which particular streams should be referenced in signaling
+
+  RTCRtpSender addTrack(MediaStreamTrack track,
+                        MediaStream stream,
+                        MediaStream... moreStreams);
+  void removeTrack(RTCRtpSender sender);
+
+  RTCRtpTransceiver addTransceiver((MediaStreamTrack or DOMString) trackOrKind,
+                                   optional RTCRtpTransceiverInit init);
+
+  sequence<RTCRtpSender> getSenders();
+  sequence<RTCRtpReceiver> getReceivers();
+  sequence<RTCRtpTransceiver> getTransceivers();
+
+  // test-only: for testing getContributingSources
+  [ChromeOnly]
+  DOMHighResTimeStamp mozGetNowInRtpSourceReferenceTime();
+  // test-only: for testing getContributingSources
+  [ChromeOnly]
+  void mozInsertAudioLevelForContributingSource(RTCRtpReceiver receiver,
+                                                unsigned long source,
+                                                DOMHighResTimeStamp timestamp,
+                                                boolean hasLevel,
+                                                byte level);
+  [ChromeOnly]
+  void mozAddRIDExtension(RTCRtpReceiver receiver, unsigned short extensionId);
+  [ChromeOnly]
+  void mozAddRIDFilter(RTCRtpReceiver receiver, DOMString rid);
+  [ChromeOnly]
+  void mozSetPacketCallback(mozPacketCallback callback);
+  [ChromeOnly]
+  void mozEnablePacketDump(unsigned long level,
+                           mozPacketDumpType type,
+                           boolean sending);
+  [ChromeOnly]
+  void mozDisablePacketDump(unsigned long level,
+                            mozPacketDumpType type,
+                            boolean sending);
+
+  void close ();
+  attribute EventHandler onnegotiationneeded;
+  attribute EventHandler onicecandidate;
+  attribute EventHandler onsignalingstatechange;
+  attribute EventHandler onaddstream; // obsolete
+  attribute EventHandler onaddtrack;  // obsolete
+  attribute EventHandler ontrack;     // replaces onaddtrack and onaddstream.
+  attribute EventHandler onremovestream;
+  attribute EventHandler oniceconnectionstatechange;
+  attribute EventHandler onicegatheringstatechange;
+
+  Promise<RTCStatsReport> getStats (optional MediaStreamTrack? selector);
+
+  // Data channel.
+  RTCDataChannel createDataChannel (DOMString label,
+                                    optional RTCDataChannelInit dataChannelDict);
+  attribute EventHandler ondatachannel;
+};
+
+// Legacy callback API
+
+partial interface RTCPeerConnection {
+
+  // Dummy Promise<void> return values avoid "WebIDL.WebIDLError: error:
+  // We have overloads with both Promise and non-Promise return types"
+
+  Promise<void> createOffer (RTCSessionDescriptionCallback successCallback,
+                             RTCPeerConnectionErrorCallback failureCallback,
+                             optional RTCOfferOptions options);
+  Promise<void> createAnswer (RTCSessionDescriptionCallback successCallback,
+                              RTCPeerConnectionErrorCallback failureCallback);
+  Promise<void> setLocalDescription (RTCSessionDescriptionInit description,
+                                     VoidFunction successCallback,
+                                     RTCPeerConnectionErrorCallback failureCallback);
+  Promise<void> setRemoteDescription (RTCSessionDescriptionInit description,
+                                      VoidFunction successCallback,
+                                      RTCPeerConnectionErrorCallback failureCallback);
+  Promise<void> addIceCandidate (RTCIceCandidate candidate,
+                                 VoidFunction successCallback,
+                                 RTCPeerConnectionErrorCallback failureCallback);
+  Promise<void> getStats (MediaStreamTrack? selector,
+                          RTCStatsCallback successCallback,
+                          RTCPeerConnectionErrorCallback failureCallback);
+};
diff --git a/crates/web-sys/webidls/available/RTCPeerConnectionIceEvent.webidl b/crates/web-sys/webidls/available/RTCPeerConnectionIceEvent.webidl
new file mode 100644
index 00000000..5ec47f47
--- /dev/null
+++ b/crates/web-sys/webidls/available/RTCPeerConnectionIceEvent.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2011/webrtc/editor/webrtc.html#idl-def-RTCPeerConnectionIceEvent
+ */
+
+dictionary RTCPeerConnectionIceEventInit : EventInit {
+  RTCIceCandidate? candidate = null;
+};
+
+[Pref="media.peerconnection.enabled",
+ Constructor(DOMString type,
+             optional RTCPeerConnectionIceEventInit eventInitDict)]
+interface RTCPeerConnectionIceEvent : Event {
+  readonly attribute RTCIceCandidate? candidate;
+};
diff --git a/crates/web-sys/webidls/available/RTCPeerConnectionStatic.webidl b/crates/web-sys/webidls/available/RTCPeerConnectionStatic.webidl
new file mode 100644
index 00000000..5b21ee6e
--- /dev/null
+++ b/crates/web-sys/webidls/available/RTCPeerConnectionStatic.webidl
@@ -0,0 +1,39 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/*
+  Right now, it is not possible to add static functions to a JS implemented
+  interface (see bug 863952), so we need to create a simple interface with a
+  trivial constructor and no data to hold these functions that really ought to
+  be static in RTCPeerConnection.
+  TODO(bcampen@mozilla.com) Merge this code into RTCPeerConnection once this
+  limitation is gone. (Bug 1017082)
+*/
+
+enum RTCLifecycleEvent {
+    "initialized",
+    "icegatheringstatechange",
+    "iceconnectionstatechange"
+};
+
+callback PeerConnectionLifecycleCallback = void (RTCPeerConnection pc,
+                                                 unsigned long long windowId,
+                                                 RTCLifecycleEvent eventType);
+
+[ChromeOnly,
+ Pref="media.peerconnection.enabled",
+ JSImplementation="@mozilla.org/dom/peerconnectionstatic;1",
+ Constructor()]
+interface RTCPeerConnectionStatic {
+
+  /* One slot per window (the window in which the register call is made),
+     automatically unregistered when window goes away.
+     Fires when a PC is created, and whenever the ICE connection state or
+     gathering state changes. */
+  void registerPeerConnectionLifecycleCallback(
+    PeerConnectionLifecycleCallback cb);
+};
+
diff --git a/crates/web-sys/webidls/available/RTCRtpReceiver.webidl b/crates/web-sys/webidls/available/RTCRtpReceiver.webidl
new file mode 100644
index 00000000..38cc3394
--- /dev/null
+++ b/crates/web-sys/webidls/available/RTCRtpReceiver.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://lists.w3.org/Archives/Public/public-webrtc/2014May/0067.html
+ */
+
+[Pref="media.peerconnection.enabled",
+ JSImplementation="@mozilla.org/dom/rtpreceiver;1"]
+interface RTCRtpReceiver {
+  readonly attribute MediaStreamTrack   track;
+  Promise<RTCStatsReport>               getStats();
+  [Pref="media.peerconnection.rtpsourcesapi.enabled"]
+  sequence<RTCRtpContributingSource>    getContributingSources();
+  [Pref="media.peerconnection.rtpsourcesapi.enabled"]
+  sequence<RTCRtpSynchronizationSource> getSynchronizationSources();
+
+  [ChromeOnly]
+  void setStreamIds(sequence<DOMString> streamIds);
+  [ChromeOnly]
+  void setRemoteSendBit(boolean sendBit);
+  [ChromeOnly]
+  void processTrackAdditionsAndRemovals(
+      RTCRtpTransceiver transceiver,
+      object postProcessing);
+};
diff --git a/crates/web-sys/webidls/available/RTCRtpSender.webidl b/crates/web-sys/webidls/available/RTCRtpSender.webidl
new file mode 100644
index 00000000..49193896
--- /dev/null
+++ b/crates/web-sys/webidls/available/RTCRtpSender.webidl
@@ -0,0 +1,88 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://w3c.github.io/webrtc-pc/#rtcrtpsender-interface
+ */
+
+enum RTCPriorityType {
+  "very-low",
+  "low",
+  "medium",
+  "high"
+};
+
+enum RTCDegradationPreference {
+  "maintain-framerate",
+  "maintain-resolution",
+  "balanced"
+};
+
+dictionary RTCRtxParameters {
+  unsigned long ssrc;
+};
+
+dictionary RTCFecParameters {
+  unsigned long ssrc;
+};
+
+dictionary RTCRtpEncodingParameters {
+  unsigned long            ssrc;
+  RTCRtxParameters         rtx;
+  RTCFecParameters         fec;
+  boolean                  active;
+  RTCPriorityType          priority;
+  unsigned long            maxBitrate;
+  RTCDegradationPreference degradationPreference = "balanced";
+  DOMString                rid;
+  float                    scaleResolutionDownBy = 1.0;
+};
+
+dictionary RTCRtpHeaderExtensionParameters {
+  DOMString      uri;
+  unsigned short id;
+  boolean        encrypted;
+};
+
+dictionary RTCRtcpParameters {
+  DOMString cname;
+  boolean   reducedSize;
+};
+
+dictionary RTCRtpCodecParameters {
+  unsigned short payloadType;
+  DOMString      mimeType;
+  unsigned long  clockRate;
+  unsigned short channels = 1;
+  DOMString      sdpFmtpLine;
+};
+
+dictionary RTCRtpParameters {
+  sequence<RTCRtpEncodingParameters>        encodings;
+  sequence<RTCRtpHeaderExtensionParameters> headerExtensions;
+  RTCRtcpParameters                         rtcp;
+  sequence<RTCRtpCodecParameters>           codecs;
+};
+
+[Pref="media.peerconnection.enabled",
+ JSImplementation="@mozilla.org/dom/rtpsender;1"]
+interface RTCRtpSender {
+  readonly attribute MediaStreamTrack? track;
+  Promise<void> setParameters (optional RTCRtpParameters parameters);
+  RTCRtpParameters getParameters();
+  Promise<void> replaceTrack(MediaStreamTrack? withTrack);
+  Promise<RTCStatsReport> getStats();
+  [Pref="media.peerconnection.dtmf.enabled"]
+  readonly attribute RTCDTMFSender? dtmf;
+  // Ugh, can't use a ChromeOnly attibute sequence<MediaStream>...
+  [ChromeOnly]
+  sequence<MediaStream> getStreams();
+  [ChromeOnly]
+  void setStreams(sequence<MediaStream> streams);
+  [ChromeOnly]
+  void setTrack(MediaStreamTrack? track);
+  [ChromeOnly]
+  void checkWasCreatedByPc(RTCPeerConnection pc);
+};
diff --git a/crates/web-sys/webidls/available/RTCRtpSources.webidl b/crates/web-sys/webidls/available/RTCRtpSources.webidl
new file mode 100644
index 00000000..460d700c
--- /dev/null
+++ b/crates/web-sys/webidls/available/RTCRtpSources.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/webrtc-pc/ Editor's Draft 18 January 2018
+ */
+
+dictionary RTCRtpContributingSource {
+    required DOMHighResTimeStamp timestamp;
+    required unsigned long       source;
+             double              audioLevel;
+};
+
+dictionary RTCRtpSynchronizationSource : RTCRtpContributingSource {
+    boolean? voiceActivityFlag;
+};
+
+/* Internal enum of types used by RTCRtpSourceEntry */
+enum RTCRtpSourceEntryType {
+    "contributing",
+    "synchronization",
+};
+/* Internal shared representation of Contributing and Synchronization sources */
+dictionary RTCRtpSourceEntry : RTCRtpSynchronizationSource {
+    required RTCRtpSourceEntryType sourceType;
+};
diff --git a/crates/web-sys/webidls/available/RTCRtpTransceiver.webidl b/crates/web-sys/webidls/available/RTCRtpTransceiver.webidl
new file mode 100644
index 00000000..5e4e81fc
--- /dev/null
+++ b/crates/web-sys/webidls/available/RTCRtpTransceiver.webidl
@@ -0,0 +1,78 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://w3c.github.io/webrtc-pc/#rtcrtptransceiver-interface
+ */
+
+enum RTCRtpTransceiverDirection {
+    "sendrecv",
+    "sendonly",
+    "recvonly",
+    "inactive"
+};
+
+dictionary RTCRtpTransceiverInit {
+    RTCRtpTransceiverDirection         direction = "sendrecv";
+    sequence<MediaStream>              streams = [];
+    // TODO: bug 1396918
+    // sequence<RTCRtpEncodingParameters> sendEncodings;
+};
+
+[Pref="media.peerconnection.enabled",
+ JSImplementation="@mozilla.org/dom/rtptransceiver;1"]
+interface RTCRtpTransceiver {
+    readonly attribute DOMString?                  mid;
+    [SameObject]
+    readonly attribute RTCRtpSender                sender;
+    [SameObject]
+    readonly attribute RTCRtpReceiver              receiver;
+    readonly attribute boolean                     stopped;
+             attribute RTCRtpTransceiverDirection  direction;
+    readonly attribute RTCRtpTransceiverDirection? currentDirection;
+
+    void stop();
+    // TODO: bug 1396922
+    // void setCodecPreferences(sequence<RTCRtpCodecCapability> codecs);
+
+    [ChromeOnly]
+    void setRemoteTrackId(DOMString trackId);
+    [ChromeOnly]
+    boolean remoteTrackIdIs(DOMString trackId);
+
+    // Mostly for testing
+    [Pref="media.peerconnection.remoteTrackId.enabled"]
+    DOMString getRemoteTrackId();
+
+    [ChromeOnly]
+    void setAddTrackMagic();
+    [ChromeOnly]
+    readonly attribute boolean addTrackMagic;
+    [ChromeOnly]
+    attribute boolean shouldRemove;
+    [ChromeOnly]
+    void setCurrentDirection(RTCRtpTransceiverDirection direction);
+    [ChromeOnly]
+    void setDirectionInternal(RTCRtpTransceiverDirection direction);
+    [ChromeOnly]
+    void setMid(DOMString mid);
+    [ChromeOnly]
+    void unsetMid();
+    [ChromeOnly]
+    void setStopped();
+
+    [ChromeOnly]
+    DOMString getKind();
+    [ChromeOnly]
+    boolean hasBeenUsedToSend();
+    [ChromeOnly]
+    void sync();
+
+    [ChromeOnly]
+    void insertDTMF(DOMString tones,
+                    optional unsigned long duration = 100,
+                    optional unsigned long interToneGap = 70);
+};
+
diff --git a/crates/web-sys/webidls/available/RTCSessionDescription.webidl b/crates/web-sys/webidls/available/RTCSessionDescription.webidl
new file mode 100644
index 00000000..6da3525e
--- /dev/null
+++ b/crates/web-sys/webidls/available/RTCSessionDescription.webidl
@@ -0,0 +1,31 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2011/webrtc/editor/webrtc.html#idl-def-RTCSessionDescription
+ */
+
+enum RTCSdpType {
+  "offer",
+  "pranswer",
+  "answer",
+  "rollback"
+};
+
+dictionary RTCSessionDescriptionInit {
+  required RTCSdpType type;
+  DOMString sdp = "";
+};
+
+[Pref="media.peerconnection.enabled",
+ JSImplementation="@mozilla.org/dom/rtcsessiondescription;1",
+ Constructor(optional RTCSessionDescriptionInit descriptionInitDict)]
+interface RTCSessionDescription {
+  // These should be readonly, but writing causes deprecation warnings for a bit
+  attribute RTCSdpType type;
+  attribute DOMString sdp;
+
+  [Default] object toJSON();
+};
diff --git a/crates/web-sys/webidls/available/RTCStatsReport.webidl b/crates/web-sys/webidls/available/RTCStatsReport.webidl
new file mode 100644
index 00000000..29729b80
--- /dev/null
+++ b/crates/web-sys/webidls/available/RTCStatsReport.webidl
@@ -0,0 +1,205 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2011/webrtc/editor/webrtc.html#rtcstatsreport-object
+ * http://www.w3.org/2011/04/webrtc/wiki/Stats
+ */
+
+enum RTCStatsType {
+  "inbound-rtp",
+  "outbound-rtp",
+  "csrc",
+  "session",
+  "track",
+  "transport",
+  "candidate-pair",
+  "local-candidate",
+  "remote-candidate"
+};
+
+dictionary RTCStats {
+  DOMHighResTimeStamp timestamp;
+  RTCStatsType type;
+  DOMString id;
+};
+
+dictionary RTCRTPStreamStats : RTCStats {
+  DOMString ssrc;
+  DOMString mediaType;
+  DOMString remoteId;
+  boolean isRemote = false;
+  DOMString mediaTrackId;
+  DOMString transportId;
+  DOMString codecId;
+
+  // Video encoder/decoder measurements, not present in RTCP case
+  double bitrateMean;
+  double bitrateStdDev;
+  double framerateMean;
+  double framerateStdDev;
+
+  // Local only measurements, RTCP related but not communicated via RTCP. Not
+  // present in RTCP case.
+  unsigned long firCount;
+  unsigned long pliCount;
+  unsigned long nackCount;
+};
+
+dictionary RTCInboundRTPStreamStats : RTCRTPStreamStats {
+  unsigned long packetsReceived;
+  unsigned long long bytesReceived;
+  double jitter;
+  unsigned long packetsLost;
+  long mozAvSyncDelay;
+  long mozJitterBufferDelay;
+  long roundTripTime;
+
+  // Video decoder measurement, not present in RTCP case
+  unsigned long discardedPackets;
+  unsigned long framesDecoded;
+};
+
+dictionary RTCOutboundRTPStreamStats : RTCRTPStreamStats {
+  unsigned long packetsSent;
+  unsigned long long bytesSent;
+  double targetBitrate;  // config encoder bitrate target of this SSRC in bits/s
+
+  // Video encoder measurements, not present in RTCP case
+  unsigned long droppedFrames;
+  unsigned long framesEncoded;
+};
+
+dictionary RTCMediaStreamTrackStats : RTCStats {
+  DOMString trackIdentifier;      // track.id property
+  boolean remoteSource;
+  sequence<DOMString> ssrcIds;
+  // Stuff that makes sense for video
+  unsigned long frameWidth;
+  unsigned long frameHeight;
+  double framesPerSecond;        // The nominal FPS value
+  unsigned long framesSent;
+  unsigned long framesReceived;  // Only for remoteSource=true
+  unsigned long framesDecoded;
+  unsigned long framesDropped;   // See VideoPlaybackQuality.droppedVideoFrames
+  unsigned long framesCorrupted; // as above.
+  // Stuff that makes sense for audio
+  double audioLevel;               // linear, 1.0 = 0 dBov (from RFC 6464).
+  // AEC stuff on audio tracks sourced from a microphone where AEC is applied
+  double echoReturnLoss;           // in decibels from G.168 (2012) section 3.14
+  double echoReturnLossEnhancement; // as above, section 3.15
+};
+
+dictionary RTCMediaStreamStats : RTCStats {
+  DOMString streamIdentifier;     // stream.id property
+  sequence<DOMString> trackIds;   // Note: stats object ids, not track.id
+};
+
+dictionary RTCRTPContributingSourceStats : RTCStats {
+  unsigned long contributorSsrc;
+  DOMString     inboundRtpStreamId;
+};
+
+dictionary RTCTransportStats: RTCStats {
+  unsigned long bytesSent;
+  unsigned long bytesReceived;
+};
+
+dictionary RTCIceComponentStats : RTCStats {
+  DOMString transportId;
+  long component;
+  unsigned long bytesSent;
+  unsigned long bytesReceived;
+  boolean activeConnection;
+};
+
+enum RTCStatsIceCandidatePairState {
+  "frozen",
+  "waiting",
+  "inprogress",
+  "failed",
+  "succeeded",
+  "cancelled"
+};
+
+dictionary RTCIceCandidatePairStats : RTCStats {
+  DOMString transportId;
+  DOMString localCandidateId;
+  DOMString remoteCandidateId;
+  RTCStatsIceCandidatePairState state;
+  unsigned long long priority;
+  boolean nominated;
+  boolean writable;
+  boolean readable;
+  unsigned long long bytesSent;
+  unsigned long long bytesReceived;
+  DOMHighResTimeStamp lastPacketSentTimestamp;
+  DOMHighResTimeStamp lastPacketReceivedTimestamp;
+  boolean selected;
+  [ChromeOnly]
+  unsigned long componentId; // moz
+};
+
+enum RTCStatsIceCandidateType {
+  "host",
+  "serverreflexive",
+  "peerreflexive",
+  "relayed"
+};
+
+dictionary RTCIceCandidateStats : RTCStats {
+  DOMString componentId;
+  DOMString candidateId;
+  DOMString ipAddress;
+  DOMString transport;
+  DOMString mozLocalTransport; // needs standardization
+  long portNumber;
+  RTCStatsIceCandidateType candidateType;
+};
+
+dictionary RTCCodecStats : RTCStats {
+  unsigned long payloadType;       // As used in RTP encoding.
+  DOMString codec;                 // video/vp8 or equivalent
+  unsigned long clockRate;
+  unsigned long channels;          // 2=stereo, missing for most other cases.
+  DOMString parameters;            // From SDP description line
+};
+
+// This is the internal representation of the report in this implementation
+// to be received from c++
+
+dictionary RTCStatsReportInternal {
+  DOMString                               pcid = "";
+  sequence<RTCInboundRTPStreamStats>      inboundRTPStreamStats;
+  sequence<RTCOutboundRTPStreamStats>     outboundRTPStreamStats;
+  sequence<RTCRTPContributingSourceStats> rtpContributingSourceStats;
+  sequence<RTCMediaStreamTrackStats>      mediaStreamTrackStats;
+  sequence<RTCMediaStreamStats>           mediaStreamStats;
+  sequence<RTCTransportStats>             transportStats;
+  sequence<RTCIceComponentStats>          iceComponentStats;
+  sequence<RTCIceCandidatePairStats>      iceCandidatePairStats;
+  sequence<RTCIceCandidateStats>          iceCandidateStats;
+  sequence<RTCCodecStats>                 codecStats;
+  DOMString                               localSdp;
+  DOMString                               remoteSdp;
+  DOMHighResTimeStamp                     timestamp;
+  unsigned long                           iceRestarts;
+  unsigned long                           iceRollbacks;
+  boolean                                 offerer; // Is the PC the offerer
+  boolean                                 closed; // Is the PC now closed
+  sequence<RTCIceCandidateStats>          trickledIceCandidateStats;
+  sequence<DOMString>                     rawLocalCandidates;
+  sequence<DOMString>                     rawRemoteCandidates;
+};
+
+[Pref="media.peerconnection.enabled",
+// TODO: Use MapClass here once it's available (Bug 928114)
+// MapClass(DOMString, object)
+ JSImplementation="@mozilla.org/dom/rtcstatsreport;1"]
+interface RTCStatsReport {
+  readonly maplike<DOMString, object>;
+  [ChromeOnly]
+  readonly attribute DOMString mozPcid;
+};
diff --git a/crates/web-sys/webidls/available/RTCTrackEvent.webidl b/crates/web-sys/webidls/available/RTCTrackEvent.webidl
new file mode 100644
index 00000000..27da47c6
--- /dev/null
+++ b/crates/web-sys/webidls/available/RTCTrackEvent.webidl
@@ -0,0 +1,29 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://w3c.github.io/webrtc-pc/#idl-def-RTCTrackEvent
+ */
+
+dictionary RTCTrackEventInit : EventInit {
+    required RTCRtpReceiver        receiver;
+    required MediaStreamTrack      track;
+    sequence<MediaStream> streams = [];
+    required RTCRtpTransceiver     transceiver;
+};
+
+[Pref="media.peerconnection.enabled",
+ Constructor(DOMString type, RTCTrackEventInit eventInitDict)]
+interface RTCTrackEvent : Event {
+    readonly        attribute RTCRtpReceiver           receiver;
+    readonly        attribute MediaStreamTrack         track;
+
+// TODO: Use FrozenArray once available. (Bug 1236777)
+//  readonly        attribute FrozenArray<MediaStream> streams;
+
+    [Frozen, Cached, Pure]
+    readonly        attribute sequence<MediaStream> streams; // workaround
+    readonly        attribute RTCRtpTransceiver transceiver;
+};
diff --git a/crates/web-sys/webidls/available/RadioNodeList.webidl b/crates/web-sys/webidls/available/RadioNodeList.webidl
new file mode 100644
index 00000000..f37e1cca
--- /dev/null
+++ b/crates/web-sys/webidls/available/RadioNodeList.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/multipage/common-dom-interfaces.html#htmlformcontrolscollection-0
+ *
+ * © Copyright 2004-2014 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+interface RadioNodeList : NodeList {
+  [NeedsCallerType]
+  attribute DOMString value;
+};
diff --git a/crates/web-sys/webidls/available/Range.webidl b/crates/web-sys/webidls/available/Range.webidl
new file mode 100644
index 00000000..1313eb90
--- /dev/null
+++ b/crates/web-sys/webidls/available/Range.webidl
@@ -0,0 +1,100 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dom.spec.whatwg.org/#range
+ * http://domparsing.spec.whatwg.org/#dom-range-createcontextualfragment
+ * http://dvcs.w3.org/hg/csswg/raw-file/tip/cssom-view/Overview.html#extensions-to-the-range-interface
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Constructor]
+interface Range {
+  [Throws]
+  readonly attribute Node startContainer;
+  [Throws]
+  readonly attribute unsigned long startOffset;
+  [Throws]
+  readonly attribute Node endContainer;
+  [Throws]
+  readonly attribute unsigned long endOffset;
+  readonly attribute boolean collapsed;
+  [Throws]
+  readonly attribute Node commonAncestorContainer;
+
+  [Throws, BinaryName="setStartJS"]
+  void setStart(Node refNode, unsigned long offset);
+  [Throws, BinaryName="setEndJS"]
+  void setEnd(Node refNode, unsigned long offset);
+  [Throws, BinaryName="setStartBeforeJS"]
+  void setStartBefore(Node refNode);
+  [Throws, BinaryName="setStartAfterJS"]
+  void setStartAfter(Node refNode);
+  [Throws, BinaryName="setEndBeforeJS"]
+  void setEndBefore(Node refNode);
+  [Throws, BinaryName="setEndAfterJS"]
+  void setEndAfter(Node refNode);
+  [BinaryName="collapseJS"]
+  void collapse(optional boolean toStart = false);
+  [Throws, BinaryName="selectNodeJS"]
+  void selectNode(Node refNode);
+  [Throws, BinaryName="selectNodeContentsJS"]
+  void selectNodeContents(Node refNode);
+
+  const unsigned short START_TO_START = 0;
+  const unsigned short START_TO_END = 1;
+  const unsigned short END_TO_END = 2;
+  const unsigned short END_TO_START = 3;
+  [Throws]
+  short compareBoundaryPoints(unsigned short how, Range sourceRange);
+  [CEReactions, Throws]
+  void deleteContents();
+  [CEReactions, Throws]
+  DocumentFragment extractContents();
+  [CEReactions, Throws]
+  DocumentFragment cloneContents();
+  [CEReactions, Throws]
+  void insertNode(Node node);
+  [CEReactions, Throws]
+  void surroundContents(Node newParent);
+
+  Range cloneRange();
+  void detach();
+
+  [Throws]
+  boolean isPointInRange(Node node, unsigned long offset);
+  [Throws]
+  short comparePoint(Node node, unsigned long offset);
+
+  [Throws]
+  boolean intersectsNode(Node node);
+
+  [Throws]
+  stringifier;
+};
+
+// http://domparsing.spec.whatwg.org/#dom-range-createcontextualfragment
+partial interface Range {
+  [CEReactions, Throws]
+  DocumentFragment createContextualFragment(DOMString fragment);
+};
+
+// http://dvcs.w3.org/hg/csswg/raw-file/tip/cssom-view/Overview.html#extensions-to-the-range-interface
+partial interface Range {
+  DOMRectList? getClientRects();
+  DOMRect getBoundingClientRect();
+};
+
+dictionary ClientRectsAndTexts {
+  required DOMRectList rectList;
+  required sequence<DOMString> textList;
+};
+
+partial interface Range {
+  [ChromeOnly, Throws]
+  ClientRectsAndTexts getClientRectsAndTexts();
+};
diff --git a/crates/web-sys/webidls/available/Request.webidl b/crates/web-sys/webidls/available/Request.webidl
new file mode 100644
index 00000000..7086e387
--- /dev/null
+++ b/crates/web-sys/webidls/available/Request.webidl
@@ -0,0 +1,82 @@
+/* -*- Mode: IDL; tab-width: 1; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://fetch.spec.whatwg.org/#request-class
+ */
+
+typedef (Request or USVString) RequestInfo;
+typedef unsigned long nsContentPolicyType;
+
+[Constructor(RequestInfo input, optional RequestInit init),
+ Exposed=(Window,Worker)]
+interface Request {
+  readonly attribute ByteString method;
+  readonly attribute USVString url;
+  [SameObject] readonly attribute Headers headers;
+
+  readonly attribute RequestDestination destination;
+  readonly attribute USVString referrer;
+  readonly attribute ReferrerPolicy referrerPolicy;
+  readonly attribute RequestMode mode;
+  readonly attribute RequestCredentials credentials;
+  readonly attribute RequestCache cache;
+  readonly attribute RequestRedirect redirect;
+  readonly attribute DOMString integrity;
+
+  // If a main-thread fetch() promise rejects, the error passed will be a
+  // nsresult code.
+  [ChromeOnly]
+  readonly attribute boolean mozErrors;
+
+  [BinaryName="getOrCreateSignal"]
+  readonly attribute AbortSignal signal;
+
+  [Throws,
+   NewObject] Request clone();
+
+  // Bug 1124638 - Allow chrome callers to set the context.
+  [ChromeOnly]
+  void overrideContentPolicyType(nsContentPolicyType context);
+};
+Request implements Body;
+
+dictionary RequestInit {
+  ByteString method;
+  HeadersInit headers;
+  BodyInit? body;
+  USVString referrer;
+  ReferrerPolicy referrerPolicy;
+  RequestMode mode;
+  RequestCredentials credentials;
+  RequestCache cache;
+  RequestRedirect redirect;
+  DOMString integrity;
+
+  [ChromeOnly]
+  boolean mozErrors;
+
+  AbortSignal? signal;
+
+  [Func="mozilla::dom::DOMPrefs::FetchObserverEnabled"]
+  ObserverCallback observe;
+};
+
+enum RequestDestination {
+  "",
+  "audio", "audioworklet", "document", "embed", "font", "image", "manifest", "object",
+  "paintworklet", "report", "script", "sharedworker", "style",  "track", "video",
+  "worker", "xslt"
+};
+
+enum RequestMode { "same-origin", "no-cors", "cors", "navigate" };
+enum RequestCredentials { "omit", "same-origin", "include" };
+enum RequestCache { "default", "no-store", "reload", "no-cache", "force-cache", "only-if-cached" };
+enum RequestRedirect { "follow", "error", "manual" };
+enum ReferrerPolicy {
+  "", "no-referrer", "no-referrer-when-downgrade", "origin",
+  "origin-when-cross-origin", "unsafe-url", "same-origin", "strict-origin",
+  "strict-origin-when-cross-origin"
+};
diff --git a/crates/web-sys/webidls/available/Response.webidl b/crates/web-sys/webidls/available/Response.webidl
new file mode 100644
index 00000000..0dd3d636
--- /dev/null
+++ b/crates/web-sys/webidls/available/Response.webidl
@@ -0,0 +1,48 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://fetch.spec.whatwg.org/#response-class
+ */
+
+// This should be Constructor(optional BodyInit... but BodyInit doesn't include
+// ReadableStream yet because we don't want to expose Streams API to Request.
+[Constructor(optional (Blob or BufferSource or FormData or URLSearchParams or ReadableStream or USVString)? body, optional ResponseInit init),
+ Exposed=(Window,Worker)]
+interface Response {
+  [NewObject] static Response error();
+  [Throws,
+   NewObject] static Response redirect(USVString url, optional unsigned short status = 302);
+
+  readonly attribute ResponseType type;
+
+  readonly attribute USVString url;
+  readonly attribute boolean redirected;
+  readonly attribute unsigned short status;
+  readonly attribute boolean ok;
+  readonly attribute ByteString statusText;
+  [SameObject] readonly attribute Headers headers;
+
+  [Throws,
+   NewObject] Response clone();
+
+  [ChromeOnly, NewObject, Throws] Response cloneUnfiltered();
+};
+Response implements Body;
+
+// This should be part of Body but we don't want to expose body to request yet.
+// See bug 1387483.
+partial interface Response {
+  [GetterThrows, Func="mozilla::dom::DOMPrefs::StreamsEnabled"]
+  readonly attribute ReadableStream? body;
+};
+
+dictionary ResponseInit {
+  unsigned short status = 200;
+  ByteString statusText = "OK";
+  HeadersInit headers;
+};
+
+enum ResponseType { "basic", "cors", "default", "error", "opaque", "opaqueredirect" };
diff --git a/crates/web-sys/webidls/available/SVGAElement.webidl b/crates/web-sys/webidls/available/SVGAElement.webidl
new file mode 100644
index 00000000..05b0cb11
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGAElement.webidl
@@ -0,0 +1,36 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGAElement : SVGGraphicsElement {
+  readonly attribute SVGAnimatedString target;
+
+  [SetterThrows]
+  attribute DOMString download;
+  [SetterThrows]
+  attribute DOMString ping;
+  [SetterThrows]
+  attribute DOMString rel;
+  [SetterThrows]
+  attribute DOMString referrerPolicy;
+  [PutForwards=value]
+  readonly attribute DOMTokenList relList;
+  [SetterThrows]
+  attribute DOMString hreflang;
+  [SetterThrows]
+  attribute DOMString type;
+
+  [Throws]
+  attribute DOMString text;
+};
+
+SVGAElement implements SVGURIReference;
+
diff --git a/crates/web-sys/webidls/available/SVGAngle.webidl b/crates/web-sys/webidls/available/SVGAngle.webidl
new file mode 100644
index 00000000..f17b8836
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGAngle.webidl
@@ -0,0 +1,35 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGAngle {
+
+  // Angle Unit Types
+  const unsigned short SVG_ANGLETYPE_UNKNOWN = 0;
+  const unsigned short SVG_ANGLETYPE_UNSPECIFIED = 1;
+  const unsigned short SVG_ANGLETYPE_DEG = 2;
+  const unsigned short SVG_ANGLETYPE_RAD = 3;
+  const unsigned short SVG_ANGLETYPE_GRAD = 4;
+
+  readonly attribute unsigned short unitType;
+           [SetterThrows]
+           attribute float value;
+           [SetterThrows]
+           attribute float valueInSpecifiedUnits;
+           [SetterThrows]
+           attribute DOMString valueAsString;
+
+  [Throws]
+  void newValueSpecifiedUnits(unsigned short unitType, float valueInSpecifiedUnits);
+  [Throws]
+  void convertToSpecifiedUnits(unsigned short unitType);
+};
+
diff --git a/crates/web-sys/webidls/available/SVGAnimateElement.webidl b/crates/web-sys/webidls/available/SVGAnimateElement.webidl
new file mode 100644
index 00000000..c9841f2a
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGAnimateElement.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGAnimateElement : SVGAnimationElement {
+};
+
diff --git a/crates/web-sys/webidls/available/SVGAnimateMotionElement.webidl b/crates/web-sys/webidls/available/SVGAnimateMotionElement.webidl
new file mode 100644
index 00000000..38993d76
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGAnimateMotionElement.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGAnimateMotionElement : SVGAnimationElement {
+};
+
diff --git a/crates/web-sys/webidls/available/SVGAnimateTransformElement.webidl b/crates/web-sys/webidls/available/SVGAnimateTransformElement.webidl
new file mode 100644
index 00000000..38701e61
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGAnimateTransformElement.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGAnimateTransformElement : SVGAnimationElement {
+};
+
diff --git a/crates/web-sys/webidls/available/SVGAnimatedAngle.webidl b/crates/web-sys/webidls/available/SVGAnimatedAngle.webidl
new file mode 100644
index 00000000..5b01c8c3
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGAnimatedAngle.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGAnimatedAngle {
+  [Constant]
+  readonly attribute SVGAngle baseVal;
+  [Constant]
+  readonly attribute SVGAngle animVal;
+};
+
diff --git a/crates/web-sys/webidls/available/SVGAnimatedBoolean.webidl b/crates/web-sys/webidls/available/SVGAnimatedBoolean.webidl
new file mode 100644
index 00000000..990bbc7d
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGAnimatedBoolean.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGAnimatedBoolean {
+           attribute boolean baseVal;
+  readonly attribute boolean animVal;
+};
+
diff --git a/crates/web-sys/webidls/available/SVGAnimatedEnumeration.webidl b/crates/web-sys/webidls/available/SVGAnimatedEnumeration.webidl
new file mode 100644
index 00000000..80591c2f
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGAnimatedEnumeration.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://svgwg.org/svg2-draft/types.html#InterfaceSVGAnimatedEnumeration
+ *
+ * Copyright © 2013 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved.
+ * W3C liability, trademark and document use rules apply.
+ */
+
+interface SVGAnimatedEnumeration {
+  [SetterThrows]
+           attribute unsigned short baseVal;
+  readonly attribute unsigned short animVal;
+};
diff --git a/crates/web-sys/webidls/available/SVGAnimatedInteger.webidl b/crates/web-sys/webidls/available/SVGAnimatedInteger.webidl
new file mode 100644
index 00000000..61b43b35
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGAnimatedInteger.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://svgwg.org/svg2-draft/types.html#InterfaceSVGAnimatedInteger
+ *
+ * Copyright © 2013 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved.
+ * W3C liability, trademark and document use rules apply.
+ */
+
+interface SVGAnimatedInteger {
+           attribute long baseVal;
+  readonly attribute long animVal;
+};
diff --git a/crates/web-sys/webidls/available/SVGAnimatedLength.webidl b/crates/web-sys/webidls/available/SVGAnimatedLength.webidl
new file mode 100644
index 00000000..f7fac144
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGAnimatedLength.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGAnimatedLength {
+  [Constant]
+  readonly attribute SVGLength baseVal;
+  [Constant]
+  readonly attribute SVGLength animVal;
+};
+
diff --git a/crates/web-sys/webidls/available/SVGAnimatedLengthList.webidl b/crates/web-sys/webidls/available/SVGAnimatedLengthList.webidl
new file mode 100644
index 00000000..0d85e161
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGAnimatedLengthList.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGAnimatedLengthList {
+  [Constant]
+  readonly attribute SVGLengthList baseVal;
+  [Constant]
+  readonly attribute SVGLengthList animVal;
+};
+
diff --git a/crates/web-sys/webidls/available/SVGAnimatedNumber.webidl b/crates/web-sys/webidls/available/SVGAnimatedNumber.webidl
new file mode 100644
index 00000000..5908f0f8
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGAnimatedNumber.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://svgwg.org/svg2-draft/types.html#InterfaceSVGAnimatedNumber
+ *
+ * Copyright © 2013 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved.
+ * W3C liability, trademark and document use rules apply.
+ */
+
+interface SVGAnimatedNumber {
+           attribute float baseVal;
+  readonly attribute float animVal;
+};
diff --git a/crates/web-sys/webidls/available/SVGAnimatedNumberList.webidl b/crates/web-sys/webidls/available/SVGAnimatedNumberList.webidl
new file mode 100644
index 00000000..81fba2e0
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGAnimatedNumberList.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGAnimatedNumberList {
+  [Constant]
+  readonly attribute SVGNumberList baseVal;
+  [Constant]
+  readonly attribute SVGNumberList animVal;
+};
+
diff --git a/crates/web-sys/webidls/available/SVGAnimatedPathData.webidl b/crates/web-sys/webidls/available/SVGAnimatedPathData.webidl
new file mode 100644
index 00000000..08f10f72
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGAnimatedPathData.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[NoInterfaceObject]
+interface SVGAnimatedPathData {
+  readonly attribute SVGPathSegList pathSegList;
+  //readonly attribute SVGPathSegList normalizedPathSegList;
+  readonly attribute SVGPathSegList animatedPathSegList;
+  //readonly attribute SVGPathSegList animatedNormalizedPathSegList;
+};
+
diff --git a/crates/web-sys/webidls/available/SVGAnimatedPoints.webidl b/crates/web-sys/webidls/available/SVGAnimatedPoints.webidl
new file mode 100644
index 00000000..891ca4bc
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGAnimatedPoints.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[NoInterfaceObject]
+interface SVGAnimatedPoints {
+  [Constant]
+  readonly attribute SVGPointList points;
+  [Constant]
+  readonly attribute SVGPointList animatedPoints;
+};
+
diff --git a/crates/web-sys/webidls/available/SVGAnimatedPreserveAspectRatio.webidl b/crates/web-sys/webidls/available/SVGAnimatedPreserveAspectRatio.webidl
new file mode 100644
index 00000000..07506a5b
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGAnimatedPreserveAspectRatio.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGAnimatedPreserveAspectRatio {
+  [Constant]
+  readonly attribute SVGPreserveAspectRatio baseVal;
+  [Constant]
+  readonly attribute SVGPreserveAspectRatio animVal;
+};
+
diff --git a/crates/web-sys/webidls/available/SVGAnimatedRect.webidl b/crates/web-sys/webidls/available/SVGAnimatedRect.webidl
new file mode 100644
index 00000000..fffebbe8
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGAnimatedRect.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGAnimatedRect {
+  readonly attribute SVGRect? baseVal;
+  readonly attribute SVGRect? animVal;
+};
diff --git a/crates/web-sys/webidls/available/SVGAnimatedString.webidl b/crates/web-sys/webidls/available/SVGAnimatedString.webidl
new file mode 100644
index 00000000..eaf3773d
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGAnimatedString.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGAnimatedString {
+           attribute DOMString baseVal;
+  readonly attribute DOMString animVal;
+};
diff --git a/crates/web-sys/webidls/available/SVGAnimatedTransformList.webidl b/crates/web-sys/webidls/available/SVGAnimatedTransformList.webidl
new file mode 100644
index 00000000..3ea39d13
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGAnimatedTransformList.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGAnimatedTransformList {
+  [Constant]
+  readonly attribute SVGTransformList baseVal;
+  [Constant]
+  readonly attribute SVGTransformList animVal;
+};
+
diff --git a/crates/web-sys/webidls/available/SVGAnimationElement.webidl b/crates/web-sys/webidls/available/SVGAnimationElement.webidl
new file mode 100644
index 00000000..4f9a95fe
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGAnimationElement.webidl
@@ -0,0 +1,34 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGAnimationElement : SVGElement {
+
+  readonly attribute SVGElement? targetElement;
+
+  [Throws]
+  float getStartTime();
+  float getCurrentTime();
+  [Throws]
+  float getSimpleDuration();
+
+  [Throws]
+  void beginElement();
+  [Throws]
+  void beginElementAt(float offset);
+  [Throws]
+  void endElement();
+  [Throws]
+  void endElementAt(float offset);
+};
+
+SVGAnimationElement implements SVGTests;
+
diff --git a/crates/web-sys/webidls/available/SVGCircleElement.webidl b/crates/web-sys/webidls/available/SVGCircleElement.webidl
new file mode 100644
index 00000000..021b5be2
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGCircleElement.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGCircleElement : SVGGeometryElement {
+  [Constant]
+  readonly attribute SVGAnimatedLength cx;
+  [Constant]
+  readonly attribute SVGAnimatedLength cy;
+  [Constant]
+  readonly attribute SVGAnimatedLength r;
+};
+
diff --git a/crates/web-sys/webidls/available/SVGClipPathElement.webidl b/crates/web-sys/webidls/available/SVGClipPathElement.webidl
new file mode 100644
index 00000000..e1421430
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGClipPathElement.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGClipPathElement : SVGElement {
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration clipPathUnits;
+  [Constant]
+  readonly attribute SVGAnimatedTransformList transform;
+};
+
diff --git a/crates/web-sys/webidls/available/SVGComponentTransferFunctionElement.webidl b/crates/web-sys/webidls/available/SVGComponentTransferFunctionElement.webidl
new file mode 100644
index 00000000..1842fe6f
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGComponentTransferFunctionElement.webidl
@@ -0,0 +1,36 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/index.html
+ *
+ * Copyright © 2013 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGComponentTransferFunctionElement : SVGElement {
+  // Component Transfer Types
+  const unsigned short SVG_FECOMPONENTTRANSFER_TYPE_UNKNOWN = 0;
+  const unsigned short SVG_FECOMPONENTTRANSFER_TYPE_IDENTITY = 1;
+  const unsigned short SVG_FECOMPONENTTRANSFER_TYPE_TABLE = 2;
+  const unsigned short SVG_FECOMPONENTTRANSFER_TYPE_DISCRETE = 3;
+  const unsigned short SVG_FECOMPONENTTRANSFER_TYPE_LINEAR = 4;
+  const unsigned short SVG_FECOMPONENTTRANSFER_TYPE_GAMMA = 5;
+
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration type;
+  [Constant]
+  readonly attribute SVGAnimatedNumberList tableValues;
+  [Constant]
+  readonly attribute SVGAnimatedNumber slope;
+  [Constant]
+  readonly attribute SVGAnimatedNumber intercept;
+  [Constant]
+  readonly attribute SVGAnimatedNumber amplitude;
+  [Constant]
+  readonly attribute SVGAnimatedNumber exponent;
+  [Constant]
+  readonly attribute SVGAnimatedNumber offset;
+};
diff --git a/crates/web-sys/webidls/available/SVGDefsElement.webidl b/crates/web-sys/webidls/available/SVGDefsElement.webidl
new file mode 100644
index 00000000..0b37978b
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGDefsElement.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGDefsElement : SVGGraphicsElement {
+};
+
diff --git a/crates/web-sys/webidls/available/SVGDescElement.webidl b/crates/web-sys/webidls/available/SVGDescElement.webidl
new file mode 100644
index 00000000..1841ff54
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGDescElement.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGDescElement : SVGElement {
+};
+
diff --git a/crates/web-sys/webidls/available/SVGElement.webidl b/crates/web-sys/webidls/available/SVGElement.webidl
new file mode 100644
index 00000000..a01be378
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGElement.webidl
@@ -0,0 +1,34 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGElement : Element {
+           attribute DOMString id;
+
+  [Constant]
+  readonly attribute SVGAnimatedString className;
+  [SameObject] readonly attribute DOMStringMap dataset;
+  [PutForwards=cssText, Constant]
+  readonly attribute CSSStyleDeclaration style;
+
+  readonly attribute SVGSVGElement? ownerSVGElement;
+  readonly attribute SVGElement? viewportElement;
+
+  [SetterThrows, Pure]
+        attribute long tabIndex;
+  [Throws] void focus();
+  [Throws] void blur();
+};
+
+SVGElement implements GlobalEventHandlers;
+SVGElement implements DocumentAndElementEventHandlers;
+SVGElement implements TouchEventHandlers;
+SVGElement implements OnErrorEventHandlerForNodes;
diff --git a/crates/web-sys/webidls/available/SVGEllipseElement.webidl b/crates/web-sys/webidls/available/SVGEllipseElement.webidl
new file mode 100644
index 00000000..cb509f03
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGEllipseElement.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGEllipseElement : SVGGeometryElement {
+  [Constant]
+  readonly attribute SVGAnimatedLength cx;
+  [Constant]
+  readonly attribute SVGAnimatedLength cy;
+  [Constant]
+  readonly attribute SVGAnimatedLength rx;
+  [Constant]
+  readonly attribute SVGAnimatedLength ry;
+};
+
diff --git a/crates/web-sys/webidls/available/SVGFEBlendElement.webidl b/crates/web-sys/webidls/available/SVGFEBlendElement.webidl
new file mode 100644
index 00000000..5cd469bd
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGFEBlendElement.webidl
@@ -0,0 +1,41 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGFEBlendElement : SVGElement {
+
+  // Blend Mode Types
+  const unsigned short SVG_FEBLEND_MODE_UNKNOWN = 0;
+  const unsigned short SVG_FEBLEND_MODE_NORMAL = 1;
+  const unsigned short SVG_FEBLEND_MODE_MULTIPLY = 2;
+  const unsigned short SVG_FEBLEND_MODE_SCREEN = 3;
+  const unsigned short SVG_FEBLEND_MODE_DARKEN = 4;
+  const unsigned short SVG_FEBLEND_MODE_LIGHTEN = 5;
+  const unsigned short SVG_FEBLEND_MODE_OVERLAY = 6;
+  const unsigned short SVG_FEBLEND_MODE_COLOR_DODGE = 7;
+  const unsigned short SVG_FEBLEND_MODE_COLOR_BURN = 8;
+  const unsigned short SVG_FEBLEND_MODE_HARD_LIGHT = 9;
+  const unsigned short SVG_FEBLEND_MODE_SOFT_LIGHT = 10;
+  const unsigned short SVG_FEBLEND_MODE_DIFFERENCE = 11;
+  const unsigned short SVG_FEBLEND_MODE_EXCLUSION = 12;
+  const unsigned short SVG_FEBLEND_MODE_HUE = 13;
+  const unsigned short SVG_FEBLEND_MODE_SATURATION = 14;
+  const unsigned short SVG_FEBLEND_MODE_COLOR = 15;
+  const unsigned short SVG_FEBLEND_MODE_LUMINOSITY = 16;
+  [Constant]
+  readonly attribute SVGAnimatedString in1;
+  [Constant]
+  readonly attribute SVGAnimatedString in2;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration mode;
+};
+
+SVGFEBlendElement implements SVGFilterPrimitiveStandardAttributes;
diff --git a/crates/web-sys/webidls/available/SVGFEColorMatrixElement.webidl b/crates/web-sys/webidls/available/SVGFEColorMatrixElement.webidl
new file mode 100644
index 00000000..61d91040
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGFEColorMatrixElement.webidl
@@ -0,0 +1,30 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGFEColorMatrixElement : SVGElement {
+
+  // Color Matrix Types
+  const unsigned short SVG_FECOLORMATRIX_TYPE_UNKNOWN = 0;
+  const unsigned short SVG_FECOLORMATRIX_TYPE_MATRIX = 1;
+  const unsigned short SVG_FECOLORMATRIX_TYPE_SATURATE = 2;
+  const unsigned short SVG_FECOLORMATRIX_TYPE_HUEROTATE = 3;
+  const unsigned short SVG_FECOLORMATRIX_TYPE_LUMINANCETOALPHA = 4;
+
+  [Constant]
+  readonly attribute SVGAnimatedString in1;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration type;
+  [Constant]
+  readonly attribute SVGAnimatedNumberList values;
+};
+
+SVGFEColorMatrixElement implements SVGFilterPrimitiveStandardAttributes;
diff --git a/crates/web-sys/webidls/available/SVGFEComponentTransferElement.webidl b/crates/web-sys/webidls/available/SVGFEComponentTransferElement.webidl
new file mode 100644
index 00000000..6cf6f6d6
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGFEComponentTransferElement.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGFEComponentTransferElement : SVGElement {
+  [Constant]
+  readonly attribute SVGAnimatedString in1;
+};
+
+SVGFEComponentTransferElement implements SVGFilterPrimitiveStandardAttributes;
diff --git a/crates/web-sys/webidls/available/SVGFECompositeElement.webidl b/crates/web-sys/webidls/available/SVGFECompositeElement.webidl
new file mode 100644
index 00000000..3ab983fe
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGFECompositeElement.webidl
@@ -0,0 +1,40 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGFECompositeElement : SVGElement {
+
+  // Composite Operators
+  const unsigned short SVG_FECOMPOSITE_OPERATOR_UNKNOWN = 0;
+  const unsigned short SVG_FECOMPOSITE_OPERATOR_OVER = 1;
+  const unsigned short SVG_FECOMPOSITE_OPERATOR_IN = 2;
+  const unsigned short SVG_FECOMPOSITE_OPERATOR_OUT = 3;
+  const unsigned short SVG_FECOMPOSITE_OPERATOR_ATOP = 4;
+  const unsigned short SVG_FECOMPOSITE_OPERATOR_XOR = 5;
+  const unsigned short SVG_FECOMPOSITE_OPERATOR_ARITHMETIC = 6;
+
+  [Constant]
+  readonly attribute SVGAnimatedString in1;
+  [Constant]
+  readonly attribute SVGAnimatedString in2;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration operator;
+  [Constant]
+  readonly attribute SVGAnimatedNumber k1;
+  [Constant]
+  readonly attribute SVGAnimatedNumber k2;
+  [Constant]
+  readonly attribute SVGAnimatedNumber k3;
+  [Constant]
+  readonly attribute SVGAnimatedNumber k4;
+};
+
+SVGFECompositeElement implements SVGFilterPrimitiveStandardAttributes;
diff --git a/crates/web-sys/webidls/available/SVGFEConvolveMatrixElement.webidl b/crates/web-sys/webidls/available/SVGFEConvolveMatrixElement.webidl
new file mode 100644
index 00000000..27d8e80e
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGFEConvolveMatrixElement.webidl
@@ -0,0 +1,47 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGFEConvolveMatrixElement : SVGElement {
+
+  // Edge Mode Values
+  const unsigned short SVG_EDGEMODE_UNKNOWN = 0;
+  const unsigned short SVG_EDGEMODE_DUPLICATE = 1;
+  const unsigned short SVG_EDGEMODE_WRAP = 2;
+  const unsigned short SVG_EDGEMODE_NONE = 3;
+
+  [Constant]
+  readonly attribute SVGAnimatedString in1;
+  [Constant]
+  readonly attribute SVGAnimatedInteger orderX;
+  [Constant]
+  readonly attribute SVGAnimatedInteger orderY;
+  [Constant]
+  readonly attribute SVGAnimatedNumberList kernelMatrix;
+  [Constant]
+  readonly attribute SVGAnimatedNumber divisor;
+  [Constant]
+  readonly attribute SVGAnimatedNumber bias;
+  [Constant]
+  readonly attribute SVGAnimatedInteger targetX;
+  [Constant]
+  readonly attribute SVGAnimatedInteger targetY;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration edgeMode;
+  [Constant]
+  readonly attribute SVGAnimatedNumber kernelUnitLengthX;
+  [Constant]
+  readonly attribute SVGAnimatedNumber kernelUnitLengthY;
+  [Constant]
+  readonly attribute SVGAnimatedBoolean preserveAlpha;
+};
+
+SVGFEConvolveMatrixElement implements SVGFilterPrimitiveStandardAttributes;
diff --git a/crates/web-sys/webidls/available/SVGFEDiffuseLightingElement.webidl b/crates/web-sys/webidls/available/SVGFEDiffuseLightingElement.webidl
new file mode 100644
index 00000000..fb89721d
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGFEDiffuseLightingElement.webidl
@@ -0,0 +1,26 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGFEDiffuseLightingElement : SVGElement {
+  [Constant]
+  readonly attribute SVGAnimatedString in1;
+  [Constant]
+  readonly attribute SVGAnimatedNumber surfaceScale;
+  [Constant]
+  readonly attribute SVGAnimatedNumber diffuseConstant;
+  [Constant]
+  readonly attribute SVGAnimatedNumber kernelUnitLengthX;
+  [Constant]
+  readonly attribute SVGAnimatedNumber kernelUnitLengthY;
+};
+
+SVGFEDiffuseLightingElement implements SVGFilterPrimitiveStandardAttributes;
diff --git a/crates/web-sys/webidls/available/SVGFEDisplacementMapElement.webidl b/crates/web-sys/webidls/available/SVGFEDisplacementMapElement.webidl
new file mode 100644
index 00000000..461faff9
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGFEDisplacementMapElement.webidl
@@ -0,0 +1,34 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGFEDisplacementMapElement : SVGElement {
+
+  // Channel Selectors
+  const unsigned short SVG_CHANNEL_UNKNOWN = 0;
+  const unsigned short SVG_CHANNEL_R = 1;
+  const unsigned short SVG_CHANNEL_G = 2;
+  const unsigned short SVG_CHANNEL_B = 3;
+  const unsigned short SVG_CHANNEL_A = 4;
+
+  [Constant]
+  readonly attribute SVGAnimatedString in1;
+  [Constant]
+  readonly attribute SVGAnimatedString in2;
+  [Constant]
+  readonly attribute SVGAnimatedNumber scale;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration xChannelSelector;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration yChannelSelector;
+};
+
+SVGFEDisplacementMapElement implements SVGFilterPrimitiveStandardAttributes;
diff --git a/crates/web-sys/webidls/available/SVGFEDistantLightElement.webidl b/crates/web-sys/webidls/available/SVGFEDistantLightElement.webidl
new file mode 100644
index 00000000..933befc9
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGFEDistantLightElement.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGFEDistantLightElement : SVGElement {
+  [Constant]
+  readonly attribute SVGAnimatedNumber azimuth;
+  [Constant]
+  readonly attribute SVGAnimatedNumber elevation;
+};
diff --git a/crates/web-sys/webidls/available/SVGFEDropShadowElement.webidl b/crates/web-sys/webidls/available/SVGFEDropShadowElement.webidl
new file mode 100644
index 00000000..b858fc91
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGFEDropShadowElement.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGFEDropShadowElement : SVGElement {
+  [Constant]
+  readonly attribute SVGAnimatedString in1;
+  [Constant]
+  readonly attribute SVGAnimatedNumber dx;
+  [Constant]
+  readonly attribute SVGAnimatedNumber dy;
+  [Constant]
+  readonly attribute SVGAnimatedNumber stdDeviationX;
+  [Constant]
+  readonly attribute SVGAnimatedNumber stdDeviationY;
+
+  void setStdDeviation(float stdDeviationX, float stdDeviationY);
+};
+
+SVGFEDropShadowElement implements SVGFilterPrimitiveStandardAttributes;
diff --git a/crates/web-sys/webidls/available/SVGFEFloodElement.webidl b/crates/web-sys/webidls/available/SVGFEFloodElement.webidl
new file mode 100644
index 00000000..51d9539f
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGFEFloodElement.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGFEFloodElement : SVGElement {
+};
+
+SVGFEFloodElement implements SVGFilterPrimitiveStandardAttributes;
diff --git a/crates/web-sys/webidls/available/SVGFEFuncAElement.webidl b/crates/web-sys/webidls/available/SVGFEFuncAElement.webidl
new file mode 100644
index 00000000..97282cd1
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGFEFuncAElement.webidl
@@ -0,0 +1,14 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/index.html
+ *
+ * Copyright © 2013 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGFEFuncAElement : SVGComponentTransferFunctionElement {
+};
diff --git a/crates/web-sys/webidls/available/SVGFEFuncBElement.webidl b/crates/web-sys/webidls/available/SVGFEFuncBElement.webidl
new file mode 100644
index 00000000..8b5c2b92
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGFEFuncBElement.webidl
@@ -0,0 +1,14 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/index.html
+ *
+ * Copyright © 2013 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGFEFuncBElement : SVGComponentTransferFunctionElement {
+};
diff --git a/crates/web-sys/webidls/available/SVGFEFuncGElement.webidl b/crates/web-sys/webidls/available/SVGFEFuncGElement.webidl
new file mode 100644
index 00000000..39d2f305
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGFEFuncGElement.webidl
@@ -0,0 +1,14 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/index.html
+ *
+ * Copyright © 2013 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGFEFuncGElement : SVGComponentTransferFunctionElement {
+};
diff --git a/crates/web-sys/webidls/available/SVGFEFuncRElement.webidl b/crates/web-sys/webidls/available/SVGFEFuncRElement.webidl
new file mode 100644
index 00000000..78e492be
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGFEFuncRElement.webidl
@@ -0,0 +1,14 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/index.html
+ *
+ * Copyright © 2013 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGFEFuncRElement : SVGComponentTransferFunctionElement {
+};
diff --git a/crates/web-sys/webidls/available/SVGFEGaussianBlurElement.webidl b/crates/web-sys/webidls/available/SVGFEGaussianBlurElement.webidl
new file mode 100644
index 00000000..db2101b5
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGFEGaussianBlurElement.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGFEGaussianBlurElement : SVGElement {
+  [Constant]
+  readonly attribute SVGAnimatedString in1;
+  [Constant]
+  readonly attribute SVGAnimatedNumber stdDeviationX;
+  [Constant]
+  readonly attribute SVGAnimatedNumber stdDeviationY;
+
+  void setStdDeviation(float stdDeviationX, float stdDeviationY);
+};
+
+SVGFEGaussianBlurElement implements SVGFilterPrimitiveStandardAttributes;
diff --git a/crates/web-sys/webidls/available/SVGFEImageElement.webidl b/crates/web-sys/webidls/available/SVGFEImageElement.webidl
new file mode 100644
index 00000000..3262c0d8
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGFEImageElement.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGFEImageElement : SVGElement {
+  [Constant]
+  readonly attribute SVGAnimatedPreserveAspectRatio preserveAspectRatio;
+};
+
+SVGFEImageElement implements SVGFilterPrimitiveStandardAttributes;
+SVGFEImageElement implements SVGURIReference;
diff --git a/crates/web-sys/webidls/available/SVGFEMergeElement.webidl b/crates/web-sys/webidls/available/SVGFEMergeElement.webidl
new file mode 100644
index 00000000..adafbba9
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGFEMergeElement.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGFEMergeElement : SVGElement {
+};
+
+SVGFEMergeElement implements SVGFilterPrimitiveStandardAttributes;
diff --git a/crates/web-sys/webidls/available/SVGFEMergeNodeElement.webidl b/crates/web-sys/webidls/available/SVGFEMergeNodeElement.webidl
new file mode 100644
index 00000000..4ff217ba
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGFEMergeNodeElement.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGFEMergeNodeElement : SVGElement {
+  [Constant]
+  readonly attribute SVGAnimatedString in1;
+};
diff --git a/crates/web-sys/webidls/available/SVGFEMorphologyElement.webidl b/crates/web-sys/webidls/available/SVGFEMorphologyElement.webidl
new file mode 100644
index 00000000..82910a6f
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGFEMorphologyElement.webidl
@@ -0,0 +1,30 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGFEMorphologyElement : SVGElement {
+
+  // Morphology Operators
+  const unsigned short SVG_MORPHOLOGY_OPERATOR_UNKNOWN = 0;
+  const unsigned short SVG_MORPHOLOGY_OPERATOR_ERODE = 1;
+  const unsigned short SVG_MORPHOLOGY_OPERATOR_DILATE = 2;
+
+  [Constant]
+  readonly attribute SVGAnimatedString in1;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration operator;
+  [Constant]
+  readonly attribute SVGAnimatedNumber radiusX;
+  [Constant]
+  readonly attribute SVGAnimatedNumber radiusY;
+};
+
+SVGFEMorphologyElement implements SVGFilterPrimitiveStandardAttributes;
diff --git a/crates/web-sys/webidls/available/SVGFEOffsetElement.webidl b/crates/web-sys/webidls/available/SVGFEOffsetElement.webidl
new file mode 100644
index 00000000..90132d52
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGFEOffsetElement.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGFEOffsetElement : SVGElement {
+  [Constant]
+  readonly attribute SVGAnimatedString in1;
+  [Constant]
+  readonly attribute SVGAnimatedNumber dx;
+  [Constant]
+  readonly attribute SVGAnimatedNumber dy;
+};
+
+SVGFEOffsetElement implements SVGFilterPrimitiveStandardAttributes;
diff --git a/crates/web-sys/webidls/available/SVGFEPointLightElement.webidl b/crates/web-sys/webidls/available/SVGFEPointLightElement.webidl
new file mode 100644
index 00000000..232edc45
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGFEPointLightElement.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGFEPointLightElement : SVGElement {
+  [Constant]
+  readonly attribute SVGAnimatedNumber x;
+  [Constant]
+  readonly attribute SVGAnimatedNumber y;
+  [Constant]
+  readonly attribute SVGAnimatedNumber z;
+};
diff --git a/crates/web-sys/webidls/available/SVGFESpecularLightingElement.webidl b/crates/web-sys/webidls/available/SVGFESpecularLightingElement.webidl
new file mode 100644
index 00000000..42b6b0e9
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGFESpecularLightingElement.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGFESpecularLightingElement : SVGElement {
+  [Constant]
+  readonly attribute SVGAnimatedString in1;
+  [Constant]
+  readonly attribute SVGAnimatedNumber surfaceScale;
+  [Constant]
+  readonly attribute SVGAnimatedNumber specularConstant;
+  [Constant]
+  readonly attribute SVGAnimatedNumber specularExponent;
+  [Constant]
+  readonly attribute SVGAnimatedNumber kernelUnitLengthX;
+  [Constant]
+  readonly attribute SVGAnimatedNumber kernelUnitLengthY;
+};
+
+SVGFESpecularLightingElement implements SVGFilterPrimitiveStandardAttributes;
diff --git a/crates/web-sys/webidls/available/SVGFESpotLightElement.webidl b/crates/web-sys/webidls/available/SVGFESpotLightElement.webidl
new file mode 100644
index 00000000..281d20c8
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGFESpotLightElement.webidl
@@ -0,0 +1,30 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGFESpotLightElement : SVGElement {
+  [Constant]
+  readonly attribute SVGAnimatedNumber x;
+  [Constant]
+  readonly attribute SVGAnimatedNumber y;
+  [Constant]
+  readonly attribute SVGAnimatedNumber z;
+  [Constant]
+  readonly attribute SVGAnimatedNumber pointsAtX;
+  [Constant]
+  readonly attribute SVGAnimatedNumber pointsAtY;
+  [Constant]
+  readonly attribute SVGAnimatedNumber pointsAtZ;
+  [Constant]
+  readonly attribute SVGAnimatedNumber specularExponent;
+  [Constant]
+  readonly attribute SVGAnimatedNumber limitingConeAngle;
+};
diff --git a/crates/web-sys/webidls/available/SVGFETileElement.webidl b/crates/web-sys/webidls/available/SVGFETileElement.webidl
new file mode 100644
index 00000000..38cad604
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGFETileElement.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGFETileElement : SVGElement {
+  [Constant]
+  readonly attribute SVGAnimatedString in1;
+};
+
+SVGFETileElement implements SVGFilterPrimitiveStandardAttributes;
diff --git a/crates/web-sys/webidls/available/SVGFETurbulenceElement.webidl b/crates/web-sys/webidls/available/SVGFETurbulenceElement.webidl
new file mode 100644
index 00000000..45c9d468
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGFETurbulenceElement.webidl
@@ -0,0 +1,39 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGFETurbulenceElement : SVGElement {
+
+  // Turbulence Types
+  const unsigned short SVG_TURBULENCE_TYPE_UNKNOWN = 0;
+  const unsigned short SVG_TURBULENCE_TYPE_FRACTALNOISE = 1;
+  const unsigned short SVG_TURBULENCE_TYPE_TURBULENCE = 2;
+
+  // Stitch Options
+  const unsigned short SVG_STITCHTYPE_UNKNOWN = 0;
+  const unsigned short SVG_STITCHTYPE_STITCH = 1;
+  const unsigned short SVG_STITCHTYPE_NOSTITCH = 2;
+
+  [Constant]
+  readonly attribute SVGAnimatedNumber baseFrequencyX;
+  [Constant]
+  readonly attribute SVGAnimatedNumber baseFrequencyY;
+  [Constant]
+  readonly attribute SVGAnimatedInteger numOctaves;
+  [Constant]
+  readonly attribute SVGAnimatedNumber seed;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration stitchTiles;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration type;
+};
+
+SVGFETurbulenceElement implements SVGFilterPrimitiveStandardAttributes;
diff --git a/crates/web-sys/webidls/available/SVGFilterElement.webidl b/crates/web-sys/webidls/available/SVGFilterElement.webidl
new file mode 100644
index 00000000..bbea6841
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGFilterElement.webidl
@@ -0,0 +1,31 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGFilterElement : SVGElement {
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration filterUnits;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration primitiveUnits;
+  [Constant]
+  readonly attribute SVGAnimatedLength x;
+  [Constant]
+  readonly attribute SVGAnimatedLength y;
+  [Constant]
+  readonly attribute SVGAnimatedLength width;
+  [Constant]
+  readonly attribute SVGAnimatedLength height;
+
+  // ImageData apply(ImageData source);
+};
+
+SVGFilterElement implements SVGURIReference;
+
diff --git a/crates/web-sys/webidls/available/SVGFilterPrimitiveStandardAttributes.webidl b/crates/web-sys/webidls/available/SVGFilterPrimitiveStandardAttributes.webidl
new file mode 100644
index 00000000..33195058
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGFilterPrimitiveStandardAttributes.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[NoInterfaceObject]
+interface SVGFilterPrimitiveStandardAttributes {
+  [Constant]
+  readonly attribute SVGAnimatedLength x;
+  [Constant]
+  readonly attribute SVGAnimatedLength y;
+  [Constant]
+  readonly attribute SVGAnimatedLength width;
+  [Constant]
+  readonly attribute SVGAnimatedLength height;
+  [Constant]
+  readonly attribute SVGAnimatedString result;
+};
diff --git a/crates/web-sys/webidls/available/SVGFitToViewBox.webidl b/crates/web-sys/webidls/available/SVGFitToViewBox.webidl
new file mode 100644
index 00000000..881e658d
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGFitToViewBox.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[NoInterfaceObject]
+interface SVGFitToViewBox {
+  [Constant]
+  readonly attribute SVGAnimatedRect viewBox;
+  [Constant]
+  readonly attribute SVGAnimatedPreserveAspectRatio preserveAspectRatio;
+};
+
diff --git a/crates/web-sys/webidls/available/SVGForeignObjectElement.webidl b/crates/web-sys/webidls/available/SVGForeignObjectElement.webidl
new file mode 100644
index 00000000..6829f450
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGForeignObjectElement.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGForeignObjectElement : SVGGraphicsElement {
+  [Constant]
+  readonly attribute SVGAnimatedLength x;
+  [Constant]
+  readonly attribute SVGAnimatedLength y;
+  [Constant]
+  readonly attribute SVGAnimatedLength width;
+  [Constant]
+  readonly attribute SVGAnimatedLength height;
+};
+
diff --git a/crates/web-sys/webidls/available/SVGGElement.webidl b/crates/web-sys/webidls/available/SVGGElement.webidl
new file mode 100644
index 00000000..8d690677
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGGElement.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGGElement : SVGGraphicsElement {
+};
+
diff --git a/crates/web-sys/webidls/available/SVGGeometryElement.webidl b/crates/web-sys/webidls/available/SVGGeometryElement.webidl
new file mode 100644
index 00000000..28029794
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGGeometryElement.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGGeometryElement : SVGGraphicsElement {
+  [SameObject]
+  readonly attribute SVGAnimatedNumber pathLength;
+
+  float getTotalLength();
+  [NewObject, Throws]
+  SVGPoint getPointAtLength(float distance);
+};
diff --git a/crates/web-sys/webidls/available/SVGGradientElement.webidl b/crates/web-sys/webidls/available/SVGGradientElement.webidl
new file mode 100644
index 00000000..8eb75b10
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGGradientElement.webidl
@@ -0,0 +1,29 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://svgwg.org/svg2-draft/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGGradientElement : SVGElement {
+
+  // Spread Method Types
+  const unsigned short SVG_SPREADMETHOD_UNKNOWN = 0;
+  const unsigned short SVG_SPREADMETHOD_PAD = 1;
+  const unsigned short SVG_SPREADMETHOD_REFLECT = 2;
+  const unsigned short SVG_SPREADMETHOD_REPEAT = 3;
+
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration gradientUnits;
+  [Constant]
+  readonly attribute SVGAnimatedTransformList gradientTransform;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration spreadMethod;
+};
+
+SVGGradientElement implements SVGURIReference;
diff --git a/crates/web-sys/webidls/available/SVGGraphicsElement.webidl b/crates/web-sys/webidls/available/SVGGraphicsElement.webidl
new file mode 100644
index 00000000..74af1f67
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGGraphicsElement.webidl
@@ -0,0 +1,36 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary SVGBoundingBoxOptions {
+  boolean fill = true;
+  boolean stroke = false;
+  boolean markers = false;
+  boolean clipped = false;
+};
+
+interface SVGGraphicsElement : SVGElement {
+  readonly attribute SVGAnimatedTransformList transform;
+
+  readonly attribute SVGElement? nearestViewportElement;
+  readonly attribute SVGElement? farthestViewportElement;
+
+  [NewObject, Throws]
+  SVGRect getBBox(optional SVGBoundingBoxOptions aOptions);
+  // Not implemented
+  // SVGRect getStrokeBBox();
+  SVGMatrix? getCTM();
+  SVGMatrix? getScreenCTM();
+  [Throws]
+  SVGMatrix getTransformToElement(SVGGraphicsElement element);
+};
+
+SVGGraphicsElement implements SVGTests;
diff --git a/crates/web-sys/webidls/available/SVGImageElement.webidl b/crates/web-sys/webidls/available/SVGImageElement.webidl
new file mode 100644
index 00000000..67dab60f
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGImageElement.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGImageElement : SVGGraphicsElement {
+  [Constant]
+  readonly attribute SVGAnimatedLength x;
+  [Constant]
+  readonly attribute SVGAnimatedLength y;
+  [Constant]
+  readonly attribute SVGAnimatedLength width;
+  [Constant]
+  readonly attribute SVGAnimatedLength height;
+  [Constant]
+  readonly attribute SVGAnimatedPreserveAspectRatio preserveAspectRatio;
+};
+
+SVGImageElement implements MozImageLoadingContent;
+SVGImageElement implements SVGURIReference;
+
diff --git a/crates/web-sys/webidls/available/SVGLength.webidl b/crates/web-sys/webidls/available/SVGLength.webidl
new file mode 100644
index 00000000..6d56132d
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGLength.webidl
@@ -0,0 +1,40 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGLength {
+
+  // Length Unit Types
+  const unsigned short SVG_LENGTHTYPE_UNKNOWN = 0;
+  const unsigned short SVG_LENGTHTYPE_NUMBER = 1;
+  const unsigned short SVG_LENGTHTYPE_PERCENTAGE = 2;
+  const unsigned short SVG_LENGTHTYPE_EMS = 3;
+  const unsigned short SVG_LENGTHTYPE_EXS = 4;
+  const unsigned short SVG_LENGTHTYPE_PX = 5;
+  const unsigned short SVG_LENGTHTYPE_CM = 6;
+  const unsigned short SVG_LENGTHTYPE_MM = 7;
+  const unsigned short SVG_LENGTHTYPE_IN = 8;
+  const unsigned short SVG_LENGTHTYPE_PT = 9;
+  const unsigned short SVG_LENGTHTYPE_PC = 10;
+
+  readonly attribute unsigned short unitType;
+  [Throws]
+           attribute float value;
+  [SetterThrows]
+           attribute float valueInSpecifiedUnits;
+  [SetterThrows]
+           attribute DOMString valueAsString;
+
+  [Throws]
+  void newValueSpecifiedUnits(unsigned short unitType, float valueInSpecifiedUnits);
+  [Throws]
+  void convertToSpecifiedUnits(unsigned short unitType);
+};
diff --git a/crates/web-sys/webidls/available/SVGLengthList.webidl b/crates/web-sys/webidls/available/SVGLengthList.webidl
new file mode 100644
index 00000000..c4fab44e
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGLengthList.webidl
@@ -0,0 +1,32 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG11/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGLengthList {
+  readonly attribute unsigned long numberOfItems;
+  [Throws]
+  void clear();
+  [Throws]
+  SVGLength initialize(SVGLength newItem);
+  [Throws]
+  getter SVGLength getItem(unsigned long index);
+  [Throws]
+  SVGLength insertItemBefore(SVGLength newItem, unsigned long index);
+  [Throws]
+  SVGLength replaceItem(SVGLength newItem, unsigned long index);
+  [Throws]
+  SVGLength removeItem(unsigned long index);
+  [Throws]
+  SVGLength appendItem(SVGLength newItem);
+
+  // Mozilla-specific stuff
+  readonly attribute unsigned long length; // synonym for numberOfItems
+};
diff --git a/crates/web-sys/webidls/available/SVGLineElement.webidl b/crates/web-sys/webidls/available/SVGLineElement.webidl
new file mode 100644
index 00000000..3ec4ba10
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGLineElement.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGLineElement : SVGGeometryElement {
+  [Constant]
+  readonly attribute SVGAnimatedLength x1;
+  [Constant]
+  readonly attribute SVGAnimatedLength y1;
+  [Constant]
+  readonly attribute SVGAnimatedLength x2;
+  [Constant]
+  readonly attribute SVGAnimatedLength y2;
+};
+
diff --git a/crates/web-sys/webidls/available/SVGLinearGradientElement.webidl b/crates/web-sys/webidls/available/SVGLinearGradientElement.webidl
new file mode 100644
index 00000000..200bc47e
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGLinearGradientElement.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://svgwg.org/svg2-draft/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGLinearGradientElement : SVGGradientElement {
+  [Constant]
+  readonly attribute SVGAnimatedLength x1;
+  [Constant]
+  readonly attribute SVGAnimatedLength y1;
+  [Constant]
+  readonly attribute SVGAnimatedLength x2;
+  [Constant]
+  readonly attribute SVGAnimatedLength y2;
+};
diff --git a/crates/web-sys/webidls/available/SVGMPathElement.webidl b/crates/web-sys/webidls/available/SVGMPathElement.webidl
new file mode 100644
index 00000000..7165b6cf
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGMPathElement.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGMPathElement : SVGElement {
+};
+
+SVGMPathElement implements SVGURIReference;
+
diff --git a/crates/web-sys/webidls/available/SVGMarkerElement.webidl b/crates/web-sys/webidls/available/SVGMarkerElement.webidl
new file mode 100644
index 00000000..a4f819b2
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGMarkerElement.webidl
@@ -0,0 +1,46 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGMarkerElement : SVGElement {
+
+  // Marker Unit Types
+  const unsigned short SVG_MARKERUNITS_UNKNOWN = 0;
+  const unsigned short SVG_MARKERUNITS_USERSPACEONUSE = 1;
+  const unsigned short SVG_MARKERUNITS_STROKEWIDTH = 2;
+
+  // Marker Orientation Types
+  const unsigned short SVG_MARKER_ORIENT_UNKNOWN = 0;
+  const unsigned short SVG_MARKER_ORIENT_AUTO = 1;
+  const unsigned short SVG_MARKER_ORIENT_ANGLE = 2;
+
+  [Constant]
+  readonly attribute SVGAnimatedLength refX;
+  [Constant]
+  readonly attribute SVGAnimatedLength refY;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration markerUnits;
+  [Constant]
+  readonly attribute SVGAnimatedLength markerWidth;
+  [Constant]
+  readonly attribute SVGAnimatedLength markerHeight;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration orientType;
+  [Constant]
+  readonly attribute SVGAnimatedAngle orientAngle;
+
+  void setOrientToAuto();
+  [Throws]
+  void setOrientToAngle(SVGAngle angle);
+};
+
+SVGMarkerElement implements SVGFitToViewBox;
+
diff --git a/crates/web-sys/webidls/available/SVGMaskElement.webidl b/crates/web-sys/webidls/available/SVGMaskElement.webidl
new file mode 100644
index 00000000..ad5096b6
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGMaskElement.webidl
@@ -0,0 +1,32 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGMaskElement : SVGElement {
+
+  // Mask Types
+  const unsigned short SVG_MASKTYPE_LUMINANCE = 0;
+  const unsigned short SVG_MASKTYPE_ALPHA = 1;
+
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration maskUnits;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration maskContentUnits;
+  [Constant]
+  readonly attribute SVGAnimatedLength x;
+  [Constant]
+  readonly attribute SVGAnimatedLength y;
+  [Constant]
+  readonly attribute SVGAnimatedLength width;
+  [Constant]
+  readonly attribute SVGAnimatedLength height;
+};
+
diff --git a/crates/web-sys/webidls/available/SVGMatrix.webidl b/crates/web-sys/webidls/available/SVGMatrix.webidl
new file mode 100644
index 00000000..3ede75cc
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGMatrix.webidl
@@ -0,0 +1,51 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGMatrix {
+
+  [SetterThrows]
+  attribute float a;
+  [SetterThrows]
+  attribute float b;
+  [SetterThrows]
+  attribute float c;
+  [SetterThrows]
+  attribute float d;
+  [SetterThrows]
+  attribute float e;
+  [SetterThrows]
+  attribute float f;
+
+  [NewObject]
+  SVGMatrix multiply(SVGMatrix secondMatrix);
+  [NewObject, Throws]
+  SVGMatrix inverse();
+  [NewObject]
+  SVGMatrix translate(float x, float y);
+  [NewObject]
+  SVGMatrix scale(float scaleFactor);
+  [NewObject]
+  SVGMatrix scaleNonUniform(float scaleFactorX, float scaleFactorY);
+  [NewObject]
+  SVGMatrix rotate(float angle);
+  [NewObject, Throws]
+  SVGMatrix rotateFromVector(float x, float y);
+  [NewObject]
+  SVGMatrix flipX();
+  [NewObject]
+  SVGMatrix flipY();
+  [NewObject, Throws]
+  SVGMatrix skewX(float angle);
+  [NewObject, Throws]
+  SVGMatrix skewY(float angle);
+};
+
diff --git a/crates/web-sys/webidls/available/SVGMetadataElement.webidl b/crates/web-sys/webidls/available/SVGMetadataElement.webidl
new file mode 100644
index 00000000..1c404f91
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGMetadataElement.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGMetadataElement : SVGElement {
+};
+
diff --git a/crates/web-sys/webidls/available/SVGNumber.webidl b/crates/web-sys/webidls/available/SVGNumber.webidl
new file mode 100644
index 00000000..8e1bb58c
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGNumber.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGNumber {
+  [SetterThrows]
+  attribute float value;
+};
diff --git a/crates/web-sys/webidls/available/SVGNumberList.webidl b/crates/web-sys/webidls/available/SVGNumberList.webidl
new file mode 100644
index 00000000..b4247d33
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGNumberList.webidl
@@ -0,0 +1,32 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG11/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGNumberList {
+  readonly attribute unsigned long numberOfItems;
+  [Throws]
+  void clear();
+  [Throws]
+  SVGNumber initialize(SVGNumber newItem);
+  [Throws]
+  getter SVGNumber getItem(unsigned long index);
+  [Throws]
+  SVGNumber insertItemBefore(SVGNumber newItem, unsigned long index);
+  [Throws]
+  SVGNumber replaceItem(SVGNumber newItem, unsigned long index);
+  [Throws]
+  SVGNumber removeItem(unsigned long index);
+  [Throws]
+  SVGNumber appendItem(SVGNumber newItem);
+
+  // Mozilla-specific stuff
+  readonly attribute unsigned long length; // synonym for numberOfItems
+};
diff --git a/crates/web-sys/webidls/available/SVGPathElement.webidl b/crates/web-sys/webidls/available/SVGPathElement.webidl
new file mode 100644
index 00000000..a811a8ff
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGPathElement.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+interface SVGPathElement : SVGGeometryElement {
+
+  unsigned long getPathSegAtLength(float distance);
+};
+
+SVGPathElement implements SVGAnimatedPathData;
+
diff --git a/crates/web-sys/webidls/available/SVGPathSeg.webidl b/crates/web-sys/webidls/available/SVGPathSeg.webidl
new file mode 100644
index 00000000..5895a8c9
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGPathSeg.webidl
@@ -0,0 +1,235 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[NoInterfaceObject]
+interface SVGPathSeg {
+
+  // Path Segment Types
+  const unsigned short PATHSEG_UNKNOWN = 0;
+  const unsigned short PATHSEG_CLOSEPATH = 1;
+  const unsigned short PATHSEG_MOVETO_ABS = 2;
+  const unsigned short PATHSEG_MOVETO_REL = 3;
+  const unsigned short PATHSEG_LINETO_ABS = 4;
+  const unsigned short PATHSEG_LINETO_REL = 5;
+  const unsigned short PATHSEG_CURVETO_CUBIC_ABS = 6;
+  const unsigned short PATHSEG_CURVETO_CUBIC_REL = 7;
+  const unsigned short PATHSEG_CURVETO_QUADRATIC_ABS = 8;
+  const unsigned short PATHSEG_CURVETO_QUADRATIC_REL = 9;
+  const unsigned short PATHSEG_ARC_ABS = 10;
+  const unsigned short PATHSEG_ARC_REL = 11;
+  const unsigned short PATHSEG_LINETO_HORIZONTAL_ABS = 12;
+  const unsigned short PATHSEG_LINETO_HORIZONTAL_REL = 13;
+  const unsigned short PATHSEG_LINETO_VERTICAL_ABS = 14;
+  const unsigned short PATHSEG_LINETO_VERTICAL_REL = 15;
+  const unsigned short PATHSEG_CURVETO_CUBIC_SMOOTH_ABS = 16;
+  const unsigned short PATHSEG_CURVETO_CUBIC_SMOOTH_REL = 17;
+  const unsigned short PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS = 18;
+  const unsigned short PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL = 19;
+
+  [Pure]
+  readonly attribute unsigned short pathSegType;
+  [Pure]
+  readonly attribute DOMString pathSegTypeAsLetter;
+};
+
+[NoInterfaceObject]
+interface SVGPathSegClosePath : SVGPathSeg {
+};
+
+[NoInterfaceObject]
+interface SVGPathSegMovetoAbs : SVGPathSeg {
+  [SetterThrows]
+  attribute float x;
+  [SetterThrows]
+  attribute float y;
+};
+
+[NoInterfaceObject]
+interface SVGPathSegMovetoRel : SVGPathSeg {
+  [SetterThrows]
+  attribute float x;
+  [SetterThrows]
+  attribute float y;
+};
+
+[NoInterfaceObject]
+interface SVGPathSegLinetoAbs : SVGPathSeg {
+  [SetterThrows]
+  attribute float x;
+  [SetterThrows]
+  attribute float y;
+};
+
+[NoInterfaceObject]
+interface SVGPathSegLinetoRel : SVGPathSeg {
+  [SetterThrows]
+  attribute float x;
+  [SetterThrows]
+  attribute float y;
+};
+
+[NoInterfaceObject]
+interface SVGPathSegCurvetoCubicAbs : SVGPathSeg {
+  [SetterThrows]
+  attribute float x;
+  [SetterThrows]
+  attribute float y;
+  [SetterThrows]
+  attribute float x1;
+  [SetterThrows]
+  attribute float y1;
+  [SetterThrows]
+  attribute float x2;
+  [SetterThrows]
+  attribute float y2;
+};
+
+[NoInterfaceObject]
+interface SVGPathSegCurvetoCubicRel : SVGPathSeg {
+  [SetterThrows]
+  attribute float x;
+  [SetterThrows]
+  attribute float y;
+  [SetterThrows]
+  attribute float x1;
+  [SetterThrows]
+  attribute float y1;
+  [SetterThrows]
+  attribute float x2;
+  [SetterThrows]
+  attribute float y2;
+};
+
+[NoInterfaceObject]
+interface SVGPathSegCurvetoQuadraticAbs : SVGPathSeg {
+  [SetterThrows]
+  attribute float x;
+  [SetterThrows]
+  attribute float y;
+  [SetterThrows]
+  attribute float x1;
+  [SetterThrows]
+  attribute float y1;
+};
+
+[NoInterfaceObject]
+interface SVGPathSegCurvetoQuadraticRel : SVGPathSeg {
+  [SetterThrows]
+  attribute float x;
+  [SetterThrows]
+  attribute float y;
+  [SetterThrows]
+  attribute float x1;
+  [SetterThrows]
+  attribute float y1;
+};
+
+[NoInterfaceObject]
+interface SVGPathSegArcAbs : SVGPathSeg {
+  [SetterThrows]
+  attribute float x;
+  [SetterThrows]
+  attribute float y;
+  [SetterThrows]
+  attribute float r1;
+  [SetterThrows]
+  attribute float r2;
+  [SetterThrows]
+  attribute float angle;
+  [SetterThrows]
+  attribute boolean largeArcFlag;
+  [SetterThrows]
+  attribute boolean sweepFlag;
+};
+
+[NoInterfaceObject]
+interface SVGPathSegArcRel : SVGPathSeg {
+  [SetterThrows]
+  attribute float x;
+  [SetterThrows]
+  attribute float y;
+  [SetterThrows]
+  attribute float r1;
+  [SetterThrows]
+  attribute float r2;
+  [SetterThrows]
+  attribute float angle;
+  [SetterThrows]
+  attribute boolean largeArcFlag;
+  [SetterThrows]
+  attribute boolean sweepFlag;
+};
+
+[NoInterfaceObject]
+interface SVGPathSegLinetoHorizontalAbs : SVGPathSeg {
+  [SetterThrows]
+  attribute float x;
+};
+
+[NoInterfaceObject]
+interface SVGPathSegLinetoHorizontalRel : SVGPathSeg {
+  [SetterThrows]
+  attribute float x;
+};
+
+[NoInterfaceObject]
+interface SVGPathSegLinetoVerticalAbs : SVGPathSeg {
+  [SetterThrows]
+  attribute float y;
+};
+
+[NoInterfaceObject]
+interface SVGPathSegLinetoVerticalRel : SVGPathSeg {
+  [SetterThrows]
+  attribute float y;
+};
+
+[NoInterfaceObject]
+interface SVGPathSegCurvetoCubicSmoothAbs : SVGPathSeg {
+  [SetterThrows]
+  attribute float x;
+  [SetterThrows]
+  attribute float y;
+  [SetterThrows]
+  attribute float x2;
+  [SetterThrows]
+  attribute float y2;
+};
+
+[NoInterfaceObject]
+interface SVGPathSegCurvetoCubicSmoothRel : SVGPathSeg {
+  [SetterThrows]
+  attribute float x;
+  [SetterThrows]
+  attribute float y;
+  [SetterThrows]
+  attribute float x2;
+  [SetterThrows]
+  attribute float y2;
+};
+
+[NoInterfaceObject]
+interface SVGPathSegCurvetoQuadraticSmoothAbs : SVGPathSeg {
+  [SetterThrows]
+  attribute float x;
+  [SetterThrows]
+  attribute float y;
+};
+
+[NoInterfaceObject]
+interface SVGPathSegCurvetoQuadraticSmoothRel : SVGPathSeg {
+  [SetterThrows]
+  attribute float x;
+  [SetterThrows]
+  attribute float y;
+};
+
diff --git a/crates/web-sys/webidls/available/SVGPathSegList.webidl b/crates/web-sys/webidls/available/SVGPathSegList.webidl
new file mode 100644
index 00000000..dc8c9a43
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGPathSegList.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG11/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGPathSegList {
+  readonly attribute unsigned long numberOfItems;
+  [Throws]
+  getter SVGPathSeg getItem(unsigned long index);
+
+  // Mozilla-specific stuff
+  readonly attribute unsigned long length; // synonym for numberOfItems
+};
diff --git a/crates/web-sys/webidls/available/SVGPatternElement.webidl b/crates/web-sys/webidls/available/SVGPatternElement.webidl
new file mode 100644
index 00000000..c1d9af9b
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGPatternElement.webidl
@@ -0,0 +1,31 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/pservers.html#InterfaceSVGPatternElement
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGPatternElement : SVGElement {
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration patternUnits;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration patternContentUnits;
+  [Constant]
+  readonly attribute SVGAnimatedTransformList patternTransform;
+  [Constant]
+  readonly attribute SVGAnimatedLength x;
+  [Constant]
+  readonly attribute SVGAnimatedLength y;
+  [Constant]
+  readonly attribute SVGAnimatedLength width;
+  [Constant]
+  readonly attribute SVGAnimatedLength height;
+};
+
+SVGPatternElement implements SVGFitToViewBox;
+SVGPatternElement implements SVGURIReference;
diff --git a/crates/web-sys/webidls/available/SVGPoint.webidl b/crates/web-sys/webidls/available/SVGPoint.webidl
new file mode 100644
index 00000000..c8113d40
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGPoint.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGPoint {
+
+  [SetterThrows]
+  attribute float x;
+  [SetterThrows]
+  attribute float y;
+
+  [NewObject]
+  SVGPoint matrixTransform(SVGMatrix matrix);
+};
+
diff --git a/crates/web-sys/webidls/available/SVGPointList.webidl b/crates/web-sys/webidls/available/SVGPointList.webidl
new file mode 100644
index 00000000..2bc55385
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGPointList.webidl
@@ -0,0 +1,32 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG11/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGPointList {
+  readonly attribute unsigned long numberOfItems;
+  [Throws]
+  void clear();
+  [Throws]
+  SVGPoint initialize(SVGPoint newItem);
+  [Throws]
+  getter SVGPoint getItem(unsigned long index);
+  [Throws]
+  SVGPoint insertItemBefore(SVGPoint newItem, unsigned long index);
+  [Throws]
+  SVGPoint replaceItem(SVGPoint newItem, unsigned long index);
+  [Throws]
+  SVGPoint removeItem(unsigned long index);
+  [Throws]
+  SVGPoint appendItem(SVGPoint newItem);
+
+  // Mozilla-specific stuff
+  readonly attribute unsigned long length; // synonym for numberOfItems
+};
diff --git a/crates/web-sys/webidls/available/SVGPolygonElement.webidl b/crates/web-sys/webidls/available/SVGPolygonElement.webidl
new file mode 100644
index 00000000..338f9766
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGPolygonElement.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGPolygonElement : SVGGeometryElement {
+};
+
+SVGPolygonElement implements SVGAnimatedPoints;
+
diff --git a/crates/web-sys/webidls/available/SVGPolylineElement.webidl b/crates/web-sys/webidls/available/SVGPolylineElement.webidl
new file mode 100644
index 00000000..0508d009
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGPolylineElement.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGPolylineElement : SVGGeometryElement {
+};
+
+SVGPolylineElement implements SVGAnimatedPoints;
+
diff --git a/crates/web-sys/webidls/available/SVGPreserveAspectRatio.webidl b/crates/web-sys/webidls/available/SVGPreserveAspectRatio.webidl
new file mode 100644
index 00000000..2a9db63f
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGPreserveAspectRatio.webidl
@@ -0,0 +1,38 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGPreserveAspectRatio {
+
+  // Alignment Types
+  const unsigned short SVG_PRESERVEASPECTRATIO_UNKNOWN = 0;
+  const unsigned short SVG_PRESERVEASPECTRATIO_NONE = 1;
+  const unsigned short SVG_PRESERVEASPECTRATIO_XMINYMIN = 2;
+  const unsigned short SVG_PRESERVEASPECTRATIO_XMIDYMIN = 3;
+  const unsigned short SVG_PRESERVEASPECTRATIO_XMAXYMIN = 4;
+  const unsigned short SVG_PRESERVEASPECTRATIO_XMINYMID = 5;
+  const unsigned short SVG_PRESERVEASPECTRATIO_XMIDYMID = 6;
+  const unsigned short SVG_PRESERVEASPECTRATIO_XMAXYMID = 7;
+  const unsigned short SVG_PRESERVEASPECTRATIO_XMINYMAX = 8;
+  const unsigned short SVG_PRESERVEASPECTRATIO_XMIDYMAX = 9;
+  const unsigned short SVG_PRESERVEASPECTRATIO_XMAXYMAX = 10;
+
+  // Meet-or-slice Types
+  const unsigned short SVG_MEETORSLICE_UNKNOWN = 0;
+  const unsigned short SVG_MEETORSLICE_MEET = 1;
+  const unsigned short SVG_MEETORSLICE_SLICE = 2;
+
+  [SetterThrows]
+  attribute unsigned short align;
+  [SetterThrows]
+  attribute unsigned short meetOrSlice;
+};
+
diff --git a/crates/web-sys/webidls/available/SVGRadialGradientElement.webidl b/crates/web-sys/webidls/available/SVGRadialGradientElement.webidl
new file mode 100644
index 00000000..8d7ce901
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGRadialGradientElement.webidl
@@ -0,0 +1,27 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://svgwg.org/svg2-draft/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGRadialGradientElement : SVGGradientElement {
+  [Constant]
+  readonly attribute SVGAnimatedLength cx;
+  [Constant]
+  readonly attribute SVGAnimatedLength cy;
+  [Constant]
+  readonly attribute SVGAnimatedLength r;
+  [Constant]
+  readonly attribute SVGAnimatedLength fx;
+  [Constant]
+  readonly attribute SVGAnimatedLength fy;
+  // XXX: Bug 1242048
+  // [SameObject]
+  readonly attribute SVGAnimatedLength fr;
+};
diff --git a/crates/web-sys/webidls/available/SVGRect.webidl b/crates/web-sys/webidls/available/SVGRect.webidl
new file mode 100644
index 00000000..0edda064
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGRect.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGRect {
+  [SetterThrows]
+  attribute float x;
+  [SetterThrows]
+  attribute float y;
+  [SetterThrows]
+  attribute float width;
+  [SetterThrows]
+  attribute float height;
+};
diff --git a/crates/web-sys/webidls/available/SVGRectElement.webidl b/crates/web-sys/webidls/available/SVGRectElement.webidl
new file mode 100644
index 00000000..9dddd83b
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGRectElement.webidl
@@ -0,0 +1,27 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGRectElement : SVGGeometryElement {
+  [Constant]
+  readonly attribute SVGAnimatedLength x;
+  [Constant]
+  readonly attribute SVGAnimatedLength y;
+  [Constant]
+  readonly attribute SVGAnimatedLength width;
+  [Constant]
+  readonly attribute SVGAnimatedLength height;
+  [Constant]
+  readonly attribute SVGAnimatedLength rx;
+  [Constant]
+  readonly attribute SVGAnimatedLength ry;
+};
+
diff --git a/crates/web-sys/webidls/available/SVGSVGElement.webidl b/crates/web-sys/webidls/available/SVGSVGElement.webidl
new file mode 100644
index 00000000..98ca7d6d
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGSVGElement.webidl
@@ -0,0 +1,72 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGViewSpec;
+
+interface SVGSVGElement : SVGGraphicsElement {
+
+  [Constant]
+  readonly attribute SVGAnimatedLength x;
+  [Constant]
+  readonly attribute SVGAnimatedLength y;
+  [Constant]
+  readonly attribute SVGAnimatedLength width;
+  [Constant]
+  readonly attribute SVGAnimatedLength height;
+  // readonly attribute SVGRect viewport;
+  readonly attribute boolean useCurrentView;
+  // readonly attribute SVGViewSpec currentView;
+  [UseCounter]
+           attribute float currentScale;
+  readonly attribute SVGPoint currentTranslate;
+
+  [DependsOn=Nothing, Affects=Nothing]
+  unsigned long suspendRedraw(unsigned long maxWaitMilliseconds);
+  [DependsOn=Nothing, Affects=Nothing]
+  void unsuspendRedraw(unsigned long suspendHandleID);
+  [DependsOn=Nothing, Affects=Nothing]
+  void unsuspendRedrawAll();
+  [DependsOn=Nothing, Affects=Nothing]
+  void forceRedraw();
+  void pauseAnimations();
+  void unpauseAnimations();
+  boolean animationsPaused();
+  float getCurrentTime();
+  void setCurrentTime(float seconds);
+  // NodeList getIntersectionList(SVGRect rect, SVGElement referenceElement);
+  // NodeList getEnclosureList(SVGRect rect, SVGElement referenceElement);
+  // boolean checkIntersection(SVGElement element, SVGRect rect);
+  // boolean checkEnclosure(SVGElement element, SVGRect rect);
+  void deselectAll();
+  [NewObject]
+  SVGNumber createSVGNumber();
+  [NewObject]
+  SVGLength createSVGLength();
+  [NewObject]
+  SVGAngle createSVGAngle();
+  [NewObject]
+  SVGPoint createSVGPoint();
+  [NewObject]
+  SVGMatrix createSVGMatrix();
+  [NewObject]
+  SVGRect createSVGRect();
+  [NewObject]
+  SVGTransform createSVGTransform();
+  [NewObject]
+  SVGTransform createSVGTransformFromMatrix(SVGMatrix matrix);
+  [UseCounter]
+  Element? getElementById(DOMString elementId);
+};
+
+SVGSVGElement implements SVGFitToViewBox;
+SVGSVGElement implements SVGZoomAndPanValues;
+
diff --git a/crates/web-sys/webidls/available/SVGScriptElement.webidl b/crates/web-sys/webidls/available/SVGScriptElement.webidl
new file mode 100644
index 00000000..41bbe065
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGScriptElement.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGScriptElement : SVGElement {
+  [SetterThrows]
+  attribute DOMString type;
+
+  // CORS attribute
+  [SetterThrows]
+  attribute DOMString? crossOrigin;
+};
+
+SVGScriptElement implements SVGURIReference;
+
diff --git a/crates/web-sys/webidls/available/SVGSetElement.webidl b/crates/web-sys/webidls/available/SVGSetElement.webidl
new file mode 100644
index 00000000..8b816fa7
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGSetElement.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGSetElement : SVGAnimationElement {
+};
+
diff --git a/crates/web-sys/webidls/available/SVGStopElement.webidl b/crates/web-sys/webidls/available/SVGStopElement.webidl
new file mode 100644
index 00000000..d75e52b7
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGStopElement.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGStopElement : SVGElement {
+  [Constant]
+  readonly attribute SVGAnimatedNumber offset;
+};
+
diff --git a/crates/web-sys/webidls/available/SVGStringList.webidl b/crates/web-sys/webidls/available/SVGStringList.webidl
new file mode 100644
index 00000000..ad7288fe
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGStringList.webidl
@@ -0,0 +1,32 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://svgwg.org/svg2-draft/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGStringList {
+  readonly attribute unsigned long length;
+  readonly attribute unsigned long numberOfItems;
+
+  void clear();
+  [Throws]
+  DOMString initialize(DOMString newItem);
+  [Throws]
+  DOMString getItem(unsigned long index);
+  getter DOMString(unsigned long index);
+  [Throws]
+  DOMString insertItemBefore(DOMString newItem, unsigned long index);
+  [Throws]
+  DOMString replaceItem(DOMString newItem, unsigned long index);
+  [Throws]
+  DOMString removeItem(unsigned long index);
+  [Throws]
+  DOMString appendItem(DOMString newItem);
+  //setter void (unsigned long index, DOMString newItem);
+};
diff --git a/crates/web-sys/webidls/available/SVGStyleElement.webidl b/crates/web-sys/webidls/available/SVGStyleElement.webidl
new file mode 100644
index 00000000..dcdbb8c2
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGStyleElement.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGStyleElement : SVGElement {
+  [SetterThrows]
+  attribute DOMString xmlspace; // Spec claims this should be on SVGElement
+  [SetterThrows]
+  attribute DOMString type;
+  [SetterThrows]
+  attribute DOMString media;
+  [SetterThrows]
+  attribute DOMString title;
+};
+SVGStyleElement implements LinkStyle;
+
diff --git a/crates/web-sys/webidls/available/SVGSwitchElement.webidl b/crates/web-sys/webidls/available/SVGSwitchElement.webidl
new file mode 100644
index 00000000..43cdb686
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGSwitchElement.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGSwitchElement : SVGGraphicsElement {
+};
+
diff --git a/crates/web-sys/webidls/available/SVGSymbolElement.webidl b/crates/web-sys/webidls/available/SVGSymbolElement.webidl
new file mode 100644
index 00000000..ece2c5a3
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGSymbolElement.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/struct.html#InterfaceSVGSymbolElement
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGSymbolElement : SVGElement {
+};
+
+SVGSymbolElement implements SVGFitToViewBox;
+SVGSymbolElement implements SVGTests;
diff --git a/crates/web-sys/webidls/available/SVGTSpanElement.webidl b/crates/web-sys/webidls/available/SVGTSpanElement.webidl
new file mode 100644
index 00000000..a6d94445
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGTSpanElement.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGTSpanElement : SVGTextPositioningElement {
+};
+
diff --git a/crates/web-sys/webidls/available/SVGTests.webidl b/crates/web-sys/webidls/available/SVGTests.webidl
new file mode 100644
index 00000000..e3c38242
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGTests.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[NoInterfaceObject]
+interface SVGTests {
+
+  readonly attribute SVGStringList requiredFeatures;
+  readonly attribute SVGStringList requiredExtensions;
+  readonly attribute SVGStringList systemLanguage;
+
+  boolean hasExtension(DOMString extension);
+};
+
diff --git a/crates/web-sys/webidls/available/SVGTextContentElement.webidl b/crates/web-sys/webidls/available/SVGTextContentElement.webidl
new file mode 100644
index 00000000..15ec9637
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGTextContentElement.webidl
@@ -0,0 +1,42 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGTextContentElement : SVGGraphicsElement {
+
+  // lengthAdjust Types
+  const unsigned short LENGTHADJUST_UNKNOWN = 0;
+  const unsigned short LENGTHADJUST_SPACING = 1;
+  const unsigned short LENGTHADJUST_SPACINGANDGLYPHS = 2;
+
+  [Constant]
+  readonly attribute SVGAnimatedLength textLength;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration lengthAdjust;
+
+  long getNumberOfChars();
+  float getComputedTextLength();
+  [Throws]
+  float getSubStringLength(unsigned long charnum, unsigned long nchars);
+  [Throws]
+  SVGPoint getStartPositionOfChar(unsigned long charnum);
+  [Throws]
+  SVGPoint getEndPositionOfChar(unsigned long charnum);
+  [NewObject, Throws]
+  SVGRect getExtentOfChar(unsigned long charnum);
+  [Throws]
+  float getRotationOfChar(unsigned long charnum);
+  long getCharNumAtPosition(SVGPoint point);
+  [Throws]
+  void selectSubString(unsigned long charnum, unsigned long nchars);
+};
+
+
diff --git a/crates/web-sys/webidls/available/SVGTextElement.webidl b/crates/web-sys/webidls/available/SVGTextElement.webidl
new file mode 100644
index 00000000..042326de
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGTextElement.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGTextElement : SVGTextPositioningElement {
+};
+
diff --git a/crates/web-sys/webidls/available/SVGTextPathElement.webidl b/crates/web-sys/webidls/available/SVGTextPathElement.webidl
new file mode 100644
index 00000000..73a50f3f
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGTextPathElement.webidl
@@ -0,0 +1,34 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGTextPathElement : SVGTextContentElement {
+
+  // textPath Method Types
+  const unsigned short TEXTPATH_METHODTYPE_UNKNOWN = 0;
+  const unsigned short TEXTPATH_METHODTYPE_ALIGN = 1;
+  const unsigned short TEXTPATH_METHODTYPE_STRETCH = 2;
+
+  // textPath Spacing Types
+  const unsigned short TEXTPATH_SPACINGTYPE_UNKNOWN = 0;
+  const unsigned short TEXTPATH_SPACINGTYPE_AUTO = 1;
+  const unsigned short TEXTPATH_SPACINGTYPE_EXACT = 2;
+
+  [Constant]
+  readonly attribute SVGAnimatedLength startOffset;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration method;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration spacing;
+};
+
+SVGTextPathElement implements SVGURIReference;
+
diff --git a/crates/web-sys/webidls/available/SVGTextPositioningElement.webidl b/crates/web-sys/webidls/available/SVGTextPositioningElement.webidl
new file mode 100644
index 00000000..80b8b94f
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGTextPositioningElement.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGTextPositioningElement : SVGTextContentElement {
+  [Constant]
+  readonly attribute SVGAnimatedLengthList x;
+  [Constant]
+  readonly attribute SVGAnimatedLengthList y;
+  [Constant]
+  readonly attribute SVGAnimatedLengthList dx;
+  [Constant]
+  readonly attribute SVGAnimatedLengthList dy;
+  [Constant]
+  readonly attribute SVGAnimatedNumberList rotate;
+};
+
diff --git a/crates/web-sys/webidls/available/SVGTitleElement.webidl b/crates/web-sys/webidls/available/SVGTitleElement.webidl
new file mode 100644
index 00000000..d40c6337
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGTitleElement.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGTitleElement : SVGElement {
+};
+
diff --git a/crates/web-sys/webidls/available/SVGTransform.webidl b/crates/web-sys/webidls/available/SVGTransform.webidl
new file mode 100644
index 00000000..488fb8d0
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGTransform.webidl
@@ -0,0 +1,41 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGTransform {
+
+  // Transform Types
+  const unsigned short SVG_TRANSFORM_UNKNOWN = 0;
+  const unsigned short SVG_TRANSFORM_MATRIX = 1;
+  const unsigned short SVG_TRANSFORM_TRANSLATE = 2;
+  const unsigned short SVG_TRANSFORM_SCALE = 3;
+  const unsigned short SVG_TRANSFORM_ROTATE = 4;
+  const unsigned short SVG_TRANSFORM_SKEWX = 5;
+  const unsigned short SVG_TRANSFORM_SKEWY = 6;
+
+  readonly attribute unsigned short type;
+  readonly attribute SVGMatrix matrix;
+  readonly attribute float angle;
+
+  [Throws]
+  void setMatrix(SVGMatrix matrix);
+  [Throws]
+  void setTranslate(float tx, float ty);
+  [Throws]
+  void setScale(float sx, float sy);
+  [Throws]
+  void setRotate(float angle, float cx, float cy);
+  [Throws]
+  void setSkewX(float angle);
+  [Throws]
+  void setSkewY(float angle);
+};
+
diff --git a/crates/web-sys/webidls/available/SVGTransformList.webidl b/crates/web-sys/webidls/available/SVGTransformList.webidl
new file mode 100644
index 00000000..c9763aa2
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGTransformList.webidl
@@ -0,0 +1,35 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG11/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGTransformList {
+  readonly attribute unsigned long numberOfItems;
+  [Throws]
+  void clear();
+  [Throws]
+  SVGTransform initialize(SVGTransform newItem);
+  [Throws]
+  getter SVGTransform getItem(unsigned long index);
+  [Throws]
+  SVGTransform insertItemBefore(SVGTransform newItem, unsigned long index);
+  [Throws]
+  SVGTransform replaceItem(SVGTransform newItem, unsigned long index);
+  [Throws]
+  SVGTransform removeItem(unsigned long index);
+  [Throws]
+  SVGTransform appendItem(SVGTransform newItem);
+  SVGTransform createSVGTransformFromMatrix(SVGMatrix matrix);
+  [Throws]
+  SVGTransform? consolidate();
+
+  // Mozilla-specific stuff
+  readonly attribute unsigned long length; // synonym for numberOfItems
+};
diff --git a/crates/web-sys/webidls/available/SVGURIReference.webidl b/crates/web-sys/webidls/available/SVGURIReference.webidl
new file mode 100644
index 00000000..11f94c19
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGURIReference.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[NoInterfaceObject]
+interface SVGURIReference {
+  [Constant]
+  readonly attribute SVGAnimatedString href;
+};
+
diff --git a/crates/web-sys/webidls/available/SVGUnitTypes.webidl b/crates/web-sys/webidls/available/SVGUnitTypes.webidl
new file mode 100644
index 00000000..d02e7019
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGUnitTypes.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://svgwg.org/svg2-draft/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGUnitTypes {
+  // Unit Types
+  const unsigned short SVG_UNIT_TYPE_UNKNOWN = 0;
+  const unsigned short SVG_UNIT_TYPE_USERSPACEONUSE = 1;
+  const unsigned short SVG_UNIT_TYPE_OBJECTBOUNDINGBOX = 2;
+};
+
diff --git a/crates/web-sys/webidls/available/SVGUseElement.webidl b/crates/web-sys/webidls/available/SVGUseElement.webidl
new file mode 100644
index 00000000..8e7a6fd8
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGUseElement.webidl
@@ -0,0 +1,26 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGUseElement : SVGGraphicsElement {
+  [Constant]
+  readonly attribute SVGAnimatedLength x;
+  [Constant]
+  readonly attribute SVGAnimatedLength y;
+  [Constant]
+  readonly attribute SVGAnimatedLength width;
+  [Constant]
+  readonly attribute SVGAnimatedLength height;
+  //readonly attribute SVGElementInstance instanceRoot;
+  //readonly attribute SVGElementInstance animatedInstanceRoot;
+};
+
+SVGUseElement implements SVGURIReference;
diff --git a/crates/web-sys/webidls/available/SVGViewElement.webidl b/crates/web-sys/webidls/available/SVGViewElement.webidl
new file mode 100644
index 00000000..b4be8764
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGViewElement.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGViewElement : SVGElement {
+};
+
+SVGViewElement implements SVGFitToViewBox;
+SVGViewElement implements SVGZoomAndPanValues;
+
diff --git a/crates/web-sys/webidls/available/SVGZoomAndPan.webidl b/crates/web-sys/webidls/available/SVGZoomAndPan.webidl
new file mode 100644
index 00000000..bb5ee780
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGZoomAndPan.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface SVGZoomAndPan {
+};
+
+SVGZoomAndPan implements SVGZoomAndPanValues;
diff --git a/crates/web-sys/webidls/available/SVGZoomAndPanValues.webidl b/crates/web-sys/webidls/available/SVGZoomAndPanValues.webidl
new file mode 100644
index 00000000..a09653f0
--- /dev/null
+++ b/crates/web-sys/webidls/available/SVGZoomAndPanValues.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[NoInterfaceObject]
+interface SVGZoomAndPanValues {
+
+  // Zoom and Pan Types
+  const unsigned short SVG_ZOOMANDPAN_UNKNOWN = 0;
+  const unsigned short SVG_ZOOMANDPAN_DISABLE = 1;
+  const unsigned short SVG_ZOOMANDPAN_MAGNIFY = 2;
+
+  [SetterThrows]
+  attribute unsigned short zoomAndPan;
+};
+
diff --git a/crates/web-sys/webidls/available/Screen.webidl b/crates/web-sys/webidls/available/Screen.webidl
new file mode 100644
index 00000000..72372842
--- /dev/null
+++ b/crates/web-sys/webidls/available/Screen.webidl
@@ -0,0 +1,85 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+interface Screen : EventTarget {
+  // CSSOM-View
+  // http://dev.w3.org/csswg/cssom-view/#the-screen-interface
+  [Throws]
+  readonly attribute long availWidth;
+  [Throws]
+  readonly attribute long availHeight;
+  [Throws]
+  readonly attribute long width;
+  [Throws]
+  readonly attribute long height;
+  [Throws]
+  readonly attribute long colorDepth;
+  [Throws]
+  readonly attribute long pixelDepth;
+
+  [Throws]
+  readonly attribute long top;
+  [Throws]
+  readonly attribute long left;
+  [Throws]
+  readonly attribute long availTop;
+  [Throws]
+  readonly attribute long availLeft;
+
+  /**
+   * DEPRECATED, use ScreenOrientation API instead.
+   * Returns the current screen orientation.
+   * Can be: landscape-primary, landscape-secondary,
+   *         portrait-primary or portrait-secondary.
+   */
+  [NeedsCallerType]
+  readonly attribute DOMString mozOrientation;
+
+  attribute EventHandler onmozorientationchange;
+
+  /**
+   * DEPRECATED, use ScreenOrientation API instead.
+   * Lock screen orientation to the specified type.
+   */
+  [Throws]
+  boolean mozLockOrientation(DOMString orientation);
+  [Throws]
+  boolean mozLockOrientation(sequence<DOMString> orientation);
+
+  /**
+   * DEPRECATED, use ScreenOrientation API instead.
+   * Unlock the screen orientation.
+   */
+  void mozUnlockOrientation();
+};
+
+// https://w3c.github.io/screen-orientation
+partial interface Screen {
+  readonly attribute ScreenOrientation orientation;
+};
+
+// https://wicg.github.io/media-capabilities/#idl-index
+enum ScreenColorGamut {
+  "srgb",
+  "p3",
+  "rec2020",
+};
+
+[Func="mozilla::dom::MediaCapabilities::Enabled"]
+interface ScreenLuminance {
+  readonly attribute double min;
+  readonly attribute double max;
+  readonly attribute double maxAverage;
+};
+
+partial interface Screen {
+  [Func="mozilla::dom::MediaCapabilities::Enabled"]
+  readonly attribute ScreenColorGamut colorGamut;
+  [Func="mozilla::dom::MediaCapabilities::Enabled"]
+  readonly attribute ScreenLuminance? luminance;
+
+  [Func="mozilla::dom::MediaCapabilities::Enabled"]
+  attribute EventHandler onchange;
+};
diff --git a/crates/web-sys/webidls/available/ScreenOrientation.webidl b/crates/web-sys/webidls/available/ScreenOrientation.webidl
new file mode 100644
index 00000000..0f0b6736
--- /dev/null
+++ b/crates/web-sys/webidls/available/ScreenOrientation.webidl
@@ -0,0 +1,41 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/screen-orientation
+ *
+ * Copyright © 2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights
+ * Reserved. W3C liability, trademark and document use rules apply.
+ */
+
+enum OrientationType {
+  "portrait-primary",
+  "portrait-secondary",
+  "landscape-primary",
+  "landscape-secondary"
+};
+
+enum OrientationLockType {
+  "any",
+  "natural",
+  "landscape",
+  "portrait",
+  "portrait-primary",
+  "portrait-secondary",
+  "landscape-primary",
+  "landscape-secondary"
+};
+
+interface ScreenOrientation : EventTarget {
+  [Throws]
+  Promise<void> lock(OrientationLockType orientation);
+  [Throws]
+  void unlock();
+  [Throws, NeedsCallerType]
+  readonly attribute OrientationType type;
+  [Throws, NeedsCallerType]
+  readonly attribute unsigned short angle;
+  attribute EventHandler onchange;
+};
diff --git a/crates/web-sys/webidls/available/ScriptProcessorNode.webidl b/crates/web-sys/webidls/available/ScriptProcessorNode.webidl
new file mode 100644
index 00000000..81c02443
--- /dev/null
+++ b/crates/web-sys/webidls/available/ScriptProcessorNode.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="dom.webaudio.enabled"]
+interface ScriptProcessorNode : AudioNode {
+
+    attribute EventHandler onaudioprocess;
+
+    readonly attribute long bufferSize;
+
+};
+
+// Mozilla extension
+ScriptProcessorNode implements AudioNodePassThrough;
+
diff --git a/crates/web-sys/webidls/available/ScrollAreaEvent.webidl b/crates/web-sys/webidls/available/ScrollAreaEvent.webidl
new file mode 100644
index 00000000..f24b7c0a
--- /dev/null
+++ b/crates/web-sys/webidls/available/ScrollAreaEvent.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+interface ScrollAreaEvent : UIEvent
+{
+  readonly attribute float x;
+  readonly attribute float y;
+  readonly attribute float width;
+  readonly attribute float height;
+
+  void initScrollAreaEvent(DOMString type,
+                           optional boolean canBubble = false,
+                           optional boolean cancelable = false,
+                           optional Window? view = null,
+                           optional long detail = 0,
+                           optional float x = 0,
+                           optional float y = 0,
+                           optional float width = 0,
+                           optional float height = 0);
+};
diff --git a/crates/web-sys/webidls/available/ScrollBoxObject.webidl b/crates/web-sys/webidls/available/ScrollBoxObject.webidl
new file mode 100644
index 00000000..60dfb5b5
--- /dev/null
+++ b/crates/web-sys/webidls/available/ScrollBoxObject.webidl
@@ -0,0 +1,45 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[NoInterfaceObject]
+interface ScrollBoxObject : BoxObject {
+
+  /**
+   * Scroll to the given coordinates, in css pixels.
+   * (0,0) will put the top left corner of the scrolled element's padding-box
+   * at the top left corner of the scrollport (which is its inner-border-box).
+   * Values will be clamped to legal values.
+   */
+  [Throws]
+  void scrollTo(long x, long y);
+
+  /**
+   * Scroll the given amount of device pixels to the right and down.
+   * Values will be clamped to make the resuling position legal.
+   */
+  [Throws]
+  void scrollBy(long dx, long dy);
+  [Throws]
+  void scrollByIndex(long dindexes);
+  [Throws]
+  void scrollToElement(Element child);
+
+  /**
+   * Get the current scroll position in css pixels.
+   * @see scrollTo for the definition of x and y.
+   */
+  [Pure, Throws]
+  readonly attribute long positionX;
+  [Pure, Throws]
+  readonly attribute long positionY;
+  [Pure, Throws]
+  readonly attribute long scrolledWidth;
+  [Pure, Throws]
+  readonly attribute long scrolledHeight;
+
+  [Throws]
+  void ensureElementIsVisible(Element child);
+};
diff --git a/crates/web-sys/webidls/available/ScrollViewChangeEvent.webidl b/crates/web-sys/webidls/available/ScrollViewChangeEvent.webidl
new file mode 100644
index 00000000..a3e92139
--- /dev/null
+++ b/crates/web-sys/webidls/available/ScrollViewChangeEvent.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+enum ScrollState {"started", "stopped"};
+
+dictionary ScrollViewChangeEventInit : EventInit {
+  ScrollState state = "started";
+};
+
+[Constructor(DOMString type, optional ScrollViewChangeEventInit eventInit),
+ ChromeOnly]
+interface ScrollViewChangeEvent : Event {
+  readonly attribute ScrollState state;
+};
diff --git a/crates/web-sys/webidls/available/SecurityPolicyViolationEvent.webidl b/crates/web-sys/webidls/available/SecurityPolicyViolationEvent.webidl
new file mode 100644
index 00000000..59755ca9
--- /dev/null
+++ b/crates/web-sys/webidls/available/SecurityPolicyViolationEvent.webidl
@@ -0,0 +1,42 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+enum SecurityPolicyViolationEventDisposition
+{
+  "enforce", "report"
+};
+
+[Constructor(DOMString type, optional SecurityPolicyViolationEventInit eventInitDict),
+ Pref="security.csp.enable_violation_events"]
+interface SecurityPolicyViolationEvent : Event
+{
+    readonly attribute DOMString      documentURI;
+    readonly attribute DOMString      referrer;
+    readonly attribute DOMString      blockedURI;
+    readonly attribute DOMString      violatedDirective;
+    readonly attribute DOMString      effectiveDirective;
+    readonly attribute DOMString      originalPolicy;
+    readonly attribute DOMString      sourceFile;
+    readonly attribute DOMString      sample;
+    readonly attribute SecurityPolicyViolationEventDisposition disposition;
+    readonly attribute unsigned short statusCode;
+    readonly attribute long           lineNumber;
+    readonly attribute long           columnNumber;
+};
+
+dictionary SecurityPolicyViolationEventInit : EventInit
+{
+    DOMString      documentURI = "";
+    DOMString      referrer = "";
+    DOMString      blockedURI = "";
+    DOMString      violatedDirective = "";
+    DOMString      effectiveDirective = "";
+    DOMString      originalPolicy = "";
+    DOMString      sourceFile = "";
+    DOMString      sample = "";
+    SecurityPolicyViolationEventDisposition disposition = "report";
+    unsigned short statusCode = 0;
+    long           lineNumber = 0;
+    long           columnNumber = 0;
+};
diff --git a/crates/web-sys/webidls/available/Selection.webidl b/crates/web-sys/webidls/available/Selection.webidl
new file mode 100644
index 00000000..e15d2a97
--- /dev/null
+++ b/crates/web-sys/webidls/available/Selection.webidl
@@ -0,0 +1,154 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/selection-api/#selection-interface
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface Selection {
+  readonly attribute Node?         anchorNode;
+  readonly attribute unsigned long anchorOffset;
+  readonly attribute Node?         focusNode;
+  readonly attribute unsigned long focusOffset;
+  readonly attribute boolean       isCollapsed;
+  /**
+   * Returns the number of ranges in the selection.
+   */
+  readonly attribute unsigned long rangeCount;
+  readonly attribute DOMString     type;
+  /**
+   * Returns the range at the specified index.  Throws if the index is
+   * out of range.
+   */
+  [Throws]
+  Range     getRangeAt(unsigned long index);
+  /**
+   * Adds a range to the current selection.
+   */
+  [Throws, BinaryName="addRangeJS"]
+  void      addRange(Range range);
+  /**
+   * Removes a range from the current selection.
+   */
+  [Throws]
+  void      removeRange(Range range);
+  /**
+   * Removes all ranges from the current selection.
+   */
+  [Throws]
+  void      removeAllRanges();
+  [Throws, BinaryName="RemoveAllRanges"]
+  void      empty();
+  [Throws, BinaryName="collapseJS"]
+  void      collapse(Node? node, optional unsigned long offset = 0);
+  [Throws, BinaryName="collapseJS"]
+  void      setPosition(Node? node, optional unsigned long offset = 0);
+  [Throws, BinaryName="collapseToStartJS"]
+  void      collapseToStart();
+  [Throws, BinaryName="collapseToEndJS"]
+  void      collapseToEnd();
+  [Throws, BinaryName="extendJS"]
+  void      extend(Node node, optional unsigned long offset = 0);
+  [Throws, BinaryName="setBaseAndExtentJS"]
+  void      setBaseAndExtent(Node anchorNode,
+                             unsigned long anchorOffset,
+                             Node focusNode,
+                             unsigned long focusOffset);
+  [Throws, BinaryName="selectAllChildrenJS"]
+  void      selectAllChildren(Node node);
+  [CEReactions, Throws]
+  void      deleteFromDocument();
+  [Throws]
+  boolean   containsNode(Node node,
+                         optional boolean allowPartialContainment = false);
+  stringifier DOMString ();
+};
+
+// Additional methods not currently in the spec
+partial interface Selection {
+  [Throws]
+  void modify(DOMString alter, DOMString direction,
+              DOMString granularity);
+};
+
+// Additional chrome-only methods.
+interface nsISelectionListener;
+partial interface Selection {
+  /**
+   * A true value means "selection after newline"; false means "selection before
+   * newline" when a selection is positioned "between lines".
+   */
+  [ChromeOnly,Throws]
+  attribute boolean interlinePosition;
+
+  [Throws]
+  attribute short? caretBidiLevel;
+
+  [ChromeOnly,Throws]
+  DOMString  toStringWithFormat(DOMString formatType, unsigned long flags, long wrapColumn);
+  [ChromeOnly]
+  void  addSelectionListener(nsISelectionListener newListener);
+  [ChromeOnly]
+  void  removeSelectionListener(nsISelectionListener listenerToRemove);
+
+  [ChromeOnly,BinaryName="rawType"]
+  readonly attribute short selectionType;
+
+  /**
+   * Return array of ranges intersecting with the given DOM interval.
+   */  
+  [ChromeOnly,Throws,Pref="dom.testing.selection.GetRangesForInterval"]
+  sequence<Range> GetRangesForInterval(Node beginNode, long beginOffset, Node endNode, long endOffset,
+                                       boolean allowAdjacent);
+
+  /**
+   * Scrolls a region of the selection, so that it is visible in
+   * the scrolled view.
+   *
+   * @param aRegion the region inside the selection to scroll into view
+   *                (see selection region constants defined in
+   *                nsISelectionController).
+   * @param aIsSynchronous when true, scrolls the selection into view
+   *                       before returning. If false, posts a request which
+   *                       is processed at some point after the method returns.
+   * @param aVPercent how to align the frame vertically.
+   * @param aHPercent how to align the frame horizontally.
+   */
+  [ChromeOnly,Throws]
+  void scrollIntoView(short aRegion, boolean aIsSynchronous, short aVPercent, short aHPercent);
+
+  /**
+   * setColors() sets custom colors for the selection.
+   * Currently, this is supported only when the selection type is SELECTION_FIND.
+   * Otherwise, throws an exception.
+   *
+   * @param aForegroundColor     The foreground color of the selection.
+   *                             If this is "currentColor", foreground color
+   *                             isn't changed by this selection.
+   * @param aBackgroundColor     The background color of the selection.
+   *                             If this is "transparent", background color is
+   *                             never painted.
+   * @param aAltForegroundColor  The alternative foreground color of the
+   *                             selection.
+   *                             If aBackgroundColor doesn't have sufficient
+   *                             contrast with its around or foreground color
+   *                             if "currentColor" is specified, alternative
+   *                             colors are used if it have higher contrast.
+   * @param aAltBackgroundColor  The alternative background color of the
+   *                             selection.
+   */
+  [ChromeOnly,Throws]
+  void setColors(DOMString aForegroundColor, DOMString aBackgroundColor,
+                 DOMString aAltForegroundColor, DOMString aAltBackgroundColor);
+
+  /**
+   * resetColors() forget the customized colors which were set by setColors().
+   */
+  [ChromeOnly,Throws]
+  void resetColors();
+};
diff --git a/crates/web-sys/webidls/available/ServiceWorker.webidl b/crates/web-sys/webidls/available/ServiceWorker.webidl
new file mode 100644
index 00000000..8978cf07
--- /dev/null
+++ b/crates/web-sys/webidls/available/ServiceWorker.webidl
@@ -0,0 +1,37 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html#service-worker-obj
+ *
+ */
+
+// Still unclear what should be subclassed.
+// https://github.com/slightlyoff/ServiceWorker/issues/189
+[Func="ServiceWorkerVisible",
+ // FIXME(nsm): Bug 1113522. This is exposed to satisfy webidl constraints, but it won't actually work.
+ Exposed=(Window,Worker)]
+interface ServiceWorker : EventTarget {
+  readonly attribute USVString scriptURL;
+  readonly attribute ServiceWorkerState state;
+
+  attribute EventHandler onstatechange;
+
+  [Throws]
+  void postMessage(any message, optional sequence<object> transferable = []);
+};
+
+ServiceWorker implements AbstractWorker;
+
+enum ServiceWorkerState {
+  // https://github.com/w3c/ServiceWorker/issues/1162
+  "parsed",
+
+  "installing",
+  "installed",
+  "activating",
+  "activated",
+  "redundant"
+};
diff --git a/crates/web-sys/webidls/available/ServiceWorkerContainer.webidl b/crates/web-sys/webidls/available/ServiceWorkerContainer.webidl
new file mode 100644
index 00000000..3d0bc34f
--- /dev/null
+++ b/crates/web-sys/webidls/available/ServiceWorkerContainer.webidl
@@ -0,0 +1,46 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html
+ *
+ */
+
+[Func="ServiceWorkerContainer::IsEnabled",
+ Exposed=Window]
+interface ServiceWorkerContainer : EventTarget {
+  // FIXME(nsm):
+  // https://github.com/slightlyoff/ServiceWorker/issues/198
+  // and discussion at https://etherpad.mozilla.org/serviceworker07apr
+  [Unforgeable] readonly attribute ServiceWorker? controller;
+
+  [Throws]
+  readonly attribute Promise<ServiceWorkerRegistration> ready;
+
+  [NewObject]
+  Promise<ServiceWorkerRegistration> register(USVString scriptURL,
+                                              optional RegistrationOptions options);
+
+  [NewObject]
+  Promise<any> getRegistration(optional USVString documentURL = "");
+
+  [NewObject]
+  Promise<sequence<ServiceWorkerRegistration>> getRegistrations();
+
+  attribute EventHandler oncontrollerchange;
+  attribute EventHandler onerror;
+  attribute EventHandler onmessage;
+};
+
+// Testing only.
+partial interface ServiceWorkerContainer {
+  [Throws,Pref="dom.serviceWorkers.testing.enabled"]
+  DOMString getScopeForUrl(DOMString url);
+};
+
+dictionary RegistrationOptions {
+  USVString scope;
+  ServiceWorkerUpdateViaCache updateViaCache = "imports";
+};
diff --git a/crates/web-sys/webidls/available/ServiceWorkerGlobalScope.webidl b/crates/web-sys/webidls/available/ServiceWorkerGlobalScope.webidl
new file mode 100644
index 00000000..624a0643
--- /dev/null
+++ b/crates/web-sys/webidls/available/ServiceWorkerGlobalScope.webidl
@@ -0,0 +1,44 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html
+ * http://w3c.github.io/push-api/
+ * https://notifications.spec.whatwg.org/
+ *
+ * You are granted a license to use, reproduce and create derivative works of
+ * this document.
+ */
+
+[Global=(Worker,ServiceWorker),
+ Exposed=ServiceWorker]
+interface ServiceWorkerGlobalScope : WorkerGlobalScope {
+  [SameObject, BinaryName="GetClients"]
+  readonly attribute Clients clients;
+  [SameObject] readonly attribute ServiceWorkerRegistration registration;
+
+  [Throws, NewObject]
+  Promise<void> skipWaiting();
+
+  attribute EventHandler oninstall;
+  attribute EventHandler onactivate;
+
+  attribute EventHandler onfetch;
+
+  // The event.source of these MessageEvents are instances of Client
+  attribute EventHandler onmessage;
+};
+
+// These are from w3c.github.io/push-api/
+partial interface ServiceWorkerGlobalScope {
+  attribute EventHandler onpush;
+  attribute EventHandler onpushsubscriptionchange;
+};
+
+// https://notifications.spec.whatwg.org/
+partial interface ServiceWorkerGlobalScope {
+  attribute EventHandler onnotificationclick;
+  attribute EventHandler onnotificationclose;
+};
diff --git a/crates/web-sys/webidls/available/ServiceWorkerRegistration.webidl b/crates/web-sys/webidls/available/ServiceWorkerRegistration.webidl
new file mode 100644
index 00000000..26970722
--- /dev/null
+++ b/crates/web-sys/webidls/available/ServiceWorkerRegistration.webidl
@@ -0,0 +1,51 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html
+ * https://w3c.github.io/push-api/
+ * https://notifications.spec.whatwg.org/
+ */
+
+[Func="mozilla::dom::DOMPrefs::ServiceWorkersEnabled",
+ Exposed=(Window,Worker)]
+interface ServiceWorkerRegistration : EventTarget {
+  [Unforgeable] readonly attribute ServiceWorker? installing;
+  [Unforgeable] readonly attribute ServiceWorker? waiting;
+  [Unforgeable] readonly attribute ServiceWorker? active;
+
+  readonly attribute USVString scope;
+  [Throws]
+  readonly attribute ServiceWorkerUpdateViaCache updateViaCache;
+
+  [Throws, NewObject]
+  Promise<void> update();
+
+  [Throws, NewObject]
+  Promise<boolean> unregister();
+
+  // event
+  attribute EventHandler onupdatefound;
+};
+
+enum ServiceWorkerUpdateViaCache {
+  "imports",
+  "all",
+  "none"
+};
+
+// https://w3c.github.io/push-api/
+partial interface ServiceWorkerRegistration {
+  [Throws, Exposed=(Window,Worker), Func="mozilla::dom::DOMPrefs::PushEnabled"]
+  readonly attribute PushManager pushManager;
+};
+
+// https://notifications.spec.whatwg.org/
+partial interface ServiceWorkerRegistration {
+  [Throws, Func="mozilla::dom::DOMPrefs::NotificationEnabledInServiceWorkers"]
+  Promise<void> showNotification(DOMString title, optional NotificationOptions options);
+  [Throws, Func="mozilla::dom::DOMPrefs::NotificationEnabledInServiceWorkers"]
+  Promise<sequence<Notification>> getNotifications(optional GetNotificationOptions filter);
+};
diff --git a/crates/web-sys/webidls/available/ShadowRoot.webidl b/crates/web-sys/webidls/available/ShadowRoot.webidl
new file mode 100644
index 00000000..afa5b990
--- /dev/null
+++ b/crates/web-sys/webidls/available/ShadowRoot.webidl
@@ -0,0 +1,36 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+// https://dom.spec.whatwg.org/#enumdef-shadowrootmode
+enum ShadowRootMode {
+  "open",
+  "closed"
+};
+
+// https://dom.spec.whatwg.org/#shadowroot
+[Func="nsDocument::IsShadowDOMEnabled"]
+interface ShadowRoot : DocumentFragment
+{
+  // Shadow DOM v1
+  readonly attribute ShadowRootMode mode;
+  readonly attribute Element host;
+
+  // [deprecated] Shadow DOM v0
+  Element? getElementById(DOMString elementId);
+  HTMLCollection getElementsByTagName(DOMString localName);
+  HTMLCollection getElementsByTagNameNS(DOMString? namespace, DOMString localName);
+  HTMLCollection getElementsByClassName(DOMString classNames);
+  [CEReactions, SetterThrows, TreatNullAs=EmptyString]
+  attribute DOMString innerHTML;
+};
+
+ShadowRoot implements DocumentOrShadowRoot;
diff --git a/crates/web-sys/webidls/available/SharedWorker.webidl b/crates/web-sys/webidls/available/SharedWorker.webidl
new file mode 100644
index 00000000..9504f302
--- /dev/null
+++ b/crates/web-sys/webidls/available/SharedWorker.webidl
@@ -0,0 +1,12 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Constructor(USVString scriptURL, optional (DOMString or WorkerOptions) options)]
+interface SharedWorker : EventTarget {
+    readonly attribute MessagePort port;
+};
+
+SharedWorker implements AbstractWorker;
diff --git a/crates/web-sys/webidls/available/SharedWorkerGlobalScope.webidl b/crates/web-sys/webidls/available/SharedWorkerGlobalScope.webidl
new file mode 100644
index 00000000..7c9483bf
--- /dev/null
+++ b/crates/web-sys/webidls/available/SharedWorkerGlobalScope.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/multipage/workers.html#the-workerglobalscope-common-interface
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and Opera
+ * Software ASA.
+ * You are granted a license to use, reproduce and create derivative works of
+ * this document.
+ */
+
+[Global=(Worker,SharedWorker),
+ Exposed=SharedWorker]
+interface SharedWorkerGlobalScope : WorkerGlobalScope {
+  [Replaceable]
+  readonly attribute DOMString name;
+
+  void close();
+
+  attribute EventHandler onconnect;
+};
diff --git a/crates/web-sys/webidls/available/SimpleGestureEvent.webidl b/crates/web-sys/webidls/available/SimpleGestureEvent.webidl
new file mode 100644
index 00000000..ab55c901
--- /dev/null
+++ b/crates/web-sys/webidls/available/SimpleGestureEvent.webidl
@@ -0,0 +1,200 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/**
+ * The SimpleGestureEvent interface is the datatype for all
+ * Mozilla-specific simple gesture events in the Document Object Model.
+ *
+ * The following events are generated:
+ *
+ * MozSwipeGestureMayStart - Generated when the user starts a horizontal
+ * swipe across the input device, but before we know whether the user
+ * is actually scrolling past a scroll edge.
+ * This event asks two questions:  Should a swipe really be started, and
+ * in which directions should the user be able to swipe?  The first
+ * question is answered by event listeners by calling or not calling
+ * preventDefault() on the event.  Since a swipe swallows all scroll
+ * events, the default action of the swipe start event is *not* to
+ * start a swipe. Call preventDefault() if you want a swipe to be
+ * started. Doing so won't necessarily result in a swipe being started,
+ * it only communicates an intention. Once Gecko determines whether a
+ * swipe should actually be started, it will send a MozSwipeGestureStart
+ * event.
+ * The second question (swipe-able directions) is answered in the
+ * allowedDirections field.
+ *
+ * MozSwipeGestureStart - This event signals the start of a swipe.
+ * It guarantees a future MozSwipeGestureEnd event that will signal
+ * the end of a swipe animation.
+ *
+ * MozSwipeGestureUpdate - Generated periodically while the user is
+ * continuing a horizontal swipe gesture.  The "delta" value represents
+ * the current absolute gesture amount.  This event may even be sent
+ * after a MozSwipeGesture event fired in order to allow for fluid
+ * completion of a swipe animation.  The direction value is meaningless
+ * on swipe update events.
+ *
+ * MozSwipeGestureEnd - Generated when the swipe animation is completed.
+ *
+ * MozSwipeGesture - Generated when the user releases a swipe across
+ * across the input device.  This event signals that the actual swipe
+ * operation is complete, even though the animation might not be finished
+ * yet.  This event can be sent without accompanying start / update / end
+ * events, and it can also be handled on its own if the consumer doesn't
+ * want to handle swipe animation events.
+ * Only the direction value has any significance, the delta value is
+ * meaningless.
+ *
+ * MozMagnifyGestureStart - Generated when the user begins the magnify
+ * ("pinch") gesture.  The "delta" value represents the initial
+ * movement.
+ *
+ * MozMagnifyGestureUpdate - Generated periodically while the user is
+ * continuing the magnify ("pinch") gesture.  The "delta" value
+ * represents the movement since the last MozMagnifyGestureStart or
+ * MozMagnifyGestureUpdate event.
+ *
+ * MozMagnifyGesture - Generated when the user has completed the
+ * magnify ("pinch") gesture.  If you only want to receive a single
+ * event when the magnify gesture is complete, you only need to hook
+ * this event and can safely ignore the MozMagnifyGestureStart and the
+ * MozMagnifyGestureUpdate events. The "delta" value is the cumulative
+ * amount represented by the user's gesture.
+ *
+ * MozRotateGestureStart - Generated when the user begins the rotation
+ * gesture.  The "delta" value represents the initial rotation.
+ *
+ * MozRotateGestureUpdate - Generated periodically while the user is
+ * continuing the rotation gesture.  The "delta" value represents the
+ * rotation since the last MozRotateGestureStart or
+ * MozRotateGestureUpdate event.
+ *
+ * MozRotateGesture - Generated when the user has completed the
+ * rotation gesture.  If you only want to receive a single event when
+ * the rotation gesture is complete, you only need to hook this event
+ * and can safely ignore the MozRotateGestureStart and the
+ * MozRotateGestureUpdate events.  The "delta" value is the cumulative
+ * amount of rotation represented by the user's gesture.
+ *
+ * MozTapGesture - Generated when the user executes a two finger
+ * tap gesture on the input device. Client coordinates contain the
+ * center point of the tap.
+ * (XXX On OS X, only Lion (10.7) and up)
+ *
+ * MozPressTapGesture - Generated when the user executes a press
+ * and tap two finger gesture (first finger down, second finger down,
+ * second finger up, first finger up) on the input device.
+ * Client coordinates contain the center pivot point of the action.
+ * (XXX Not implemented on Mac)
+ *
+ * MozEdgeUIGesture - Generated when the user swipes the display to
+ * invoke edge ui.
+ * (XXX Win8 only)
+ *
+ * Default behavior:
+ *
+ * Some operating systems support default behaviors for gesture events
+ * when they are not handled by the application. Consumers should
+ * use event.preventDefault() to prevent default behavior when
+ * consuming events.
+ */
+
+[Func="IsChromeOrXBL"]
+interface SimpleGestureEvent : MouseEvent
+{
+  /* Swipe direction constants */
+  const unsigned long DIRECTION_UP = 1;
+  const unsigned long DIRECTION_DOWN = 2;
+  const unsigned long DIRECTION_LEFT = 4;
+  const unsigned long DIRECTION_RIGHT = 8;
+
+  /* Rotational direction constants */
+  const unsigned long ROTATION_COUNTERCLOCKWISE = 1;
+  const unsigned long ROTATION_CLOCKWISE = 2;
+
+  /* Read-write value for swipe events.
+   *
+   * Reports the directions that can be swiped to; multiple directions
+   * should be OR'ed together.
+   *
+   * The allowedDirections field is designed to be set on SwipeGestureMayStart
+   * events by event listeners.  Its value after event dispatch determines
+   * the behavior of the swipe animation that might be about to begin.
+   * Specifically, if the user swipes in a direction that can't be swiped
+   * to, the animation will have a bounce effect.
+   * Future SwipeGestureUpdate, SwipeGesture and SwipeGestureEnd events
+   * will carry the allowDirections value that was set on the SwipeMayStart
+   * event.  Changing this field on non-SwipeGestureMayStart events doesn't
+   * have any effect.
+   */
+  attribute unsigned long allowedDirections;
+
+  /* Direction of a gesture. Diagonals are indicated by OR'ing the
+   * applicable constants together.
+   *
+   * Swipes gestures may occur in any direction.
+   *
+   * Magnify gestures do not have a direction.
+   *
+   * Rotation gestures will be either ROTATION_COUNTERCLOCKWISE or
+   * ROTATION_CLOCKWISE.
+   */
+  readonly attribute unsigned long direction;
+
+  /* Delta value for magnify, rotate and swipe gestures.
+   *
+   * For rotation, the value is in degrees and is positive for
+   * clockwise rotation and negative for counterclockwise
+   * rotation.
+   *
+   * For magnification, the value will be positive for a "zoom in"
+   * (i.e, increased magnification) and negative for a "zoom out"
+   * (i.e., decreased magnification).  The particular units
+   * represented by the "delta" are currently implementation specific.
+   *
+   * XXX - The units for measuring magnification are currently
+   * unspecified because the units used by Mac OS X are currently
+   * undocumented.  The values are typically in the range of 0.0 to
+   * 100.0, but it is only safe currently to rely on the delta being
+   * positive or negative.
+   *
+   * For swipe start, update and end events, the value is a fraction
+   * of one "page".  If the resulting swipe will have DIRECTION_LEFT, the
+   * delta value will be positive; for DIRECTION_RIGHT, delta is negative.
+   * If this seems backwards to you, look at it this way:  If the current
+   * page is pushed to the right during the animation (positive delta),
+   * the page left to the current page will be visible after the swipe
+   * (DIRECTION_LEFT).
+   *
+   * Units on Windows represent the difference between the initial
+   * and current/final width between the two touch points on the input
+   * device and are measured in pixels.
+   */
+  readonly attribute double delta;
+
+  /* Click count value for taps. */
+  readonly attribute unsigned long clickCount;
+
+  void initSimpleGestureEvent(DOMString typeArg,
+                              optional boolean canBubbleArg = false,
+                              optional boolean cancelableArg = false,
+                              optional Window? viewArg = null,
+                              optional long detailArg = 0,
+                              optional long screenXArg = 0,
+                              optional long screenYArg = 0,
+                              optional long clientXArg = 0,
+                              optional long clientYArg = 0,
+                              optional boolean ctrlKeyArg = false,
+                              optional boolean altKeyArg = false,
+                              optional boolean shiftKeyArg = false,
+                              optional boolean metaKeyArg = false,
+                              optional short buttonArg = 0,
+                              optional EventTarget? relatedTargetArg = null,
+                              optional unsigned long allowedDirectionsArg = 0,
+                              optional unsigned long directionArg = 0,
+                              optional double deltaArg = 0,
+                              optional unsigned long clickCount = 0);
+};
diff --git a/crates/web-sys/webidls/available/SocketCommon.webidl b/crates/web-sys/webidls/available/SocketCommon.webidl
new file mode 100644
index 00000000..044199ea
--- /dev/null
+++ b/crates/web-sys/webidls/available/SocketCommon.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/2012/sysapps/tcp-udp-sockets/#readystate
+ */
+
+enum SocketReadyState {
+    "opening",
+    "open",
+    "closing",
+    "closed",
+    "halfclosed"
+};
diff --git a/crates/web-sys/webidls/available/SourceBuffer.webidl b/crates/web-sys/webidls/available/SourceBuffer.webidl
new file mode 100644
index 00000000..bcc91116
--- /dev/null
+++ b/crates/web-sys/webidls/available/SourceBuffer.webidl
@@ -0,0 +1,63 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/html-media/raw-file/default/media-source/media-source.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum SourceBufferAppendMode {
+    "segments",
+    "sequence"
+};
+
+[Func="mozilla::dom::MediaSource::Enabled"]
+interface SourceBuffer : EventTarget {
+  [SetterThrows]
+  attribute SourceBufferAppendMode mode;
+  readonly attribute boolean updating;
+  [Throws]
+  readonly attribute TimeRanges buffered;
+  [SetterThrows]
+  attribute double timestampOffset;
+  //readonly attribute AudioTrackList audioTracks;
+  //readonly attribute VideoTrackList videoTracks;
+  //readonly attribute TextTrackList textTracks;
+  [SetterThrows]
+  attribute double appendWindowStart;
+  [SetterThrows]
+  attribute unrestricted double appendWindowEnd;
+  attribute EventHandler onupdatestart;
+  attribute EventHandler onupdate;
+  attribute EventHandler onupdateend;
+  attribute EventHandler onerror;
+  attribute EventHandler onabort;
+  [Throws]
+  void appendBuffer(ArrayBuffer data);
+  [Throws]
+  void appendBuffer(ArrayBufferView data);
+  // Experimental function as proposed in:
+  // https://github.com/w3c/media-source/issues/100 for promise proposal.
+  [Throws, Func="mozilla::dom::MediaSource::ExperimentalEnabled"]
+  Promise<void> appendBufferAsync(ArrayBuffer data);
+  [Throws, Func="mozilla::dom::MediaSource::ExperimentalEnabled"]
+  Promise<void> appendBufferAsync(ArrayBufferView data);
+  //[Throws]
+  //void appendStream(Stream stream, [EnforceRange] optional unsigned long long maxSize);
+  [Throws]
+  void abort();
+  [Throws]
+  void remove(double start, unrestricted double end);
+  // Experimental function as proposed in:
+  // https://github.com/w3c/media-source/issues/100 for promise proposal.
+  [Throws, Func="mozilla::dom::MediaSource::ExperimentalEnabled"]
+  Promise<void> removeAsync(double start, unrestricted double end);
+  // Experimental function as proposed in:
+  // https://github.com/w3c/media-source/issues/155
+  [Throws, Func="mozilla::dom::MediaSource::ExperimentalEnabled"]
+  void changeType(DOMString type);
+};
diff --git a/crates/web-sys/webidls/available/SourceBufferList.webidl b/crates/web-sys/webidls/available/SourceBufferList.webidl
new file mode 100644
index 00000000..15c30262
--- /dev/null
+++ b/crates/web-sys/webidls/available/SourceBufferList.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/html-media/raw-file/default/media-source/media-source.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Func="mozilla::dom::MediaSource::Enabled"]
+interface SourceBufferList : EventTarget {
+  readonly attribute unsigned long length;
+  attribute EventHandler onaddsourcebuffer;
+  attribute EventHandler onremovesourcebuffer;
+  getter SourceBuffer (unsigned long index);
+};
diff --git a/crates/web-sys/webidls/available/SpeechGrammar.webidl b/crates/web-sys/webidls/available/SpeechGrammar.webidl
new file mode 100644
index 00000000..8cc97d2f
--- /dev/null
+++ b/crates/web-sys/webidls/available/SpeechGrammar.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Constructor,
+ Pref="media.webspeech.recognition.enable",
+ Func="SpeechRecognition::IsAuthorized"]
+interface SpeechGrammar {
+    [Throws]
+    attribute DOMString src;
+    [Throws]
+    attribute float weight;
+};
+
diff --git a/crates/web-sys/webidls/available/SpeechGrammarList.webidl b/crates/web-sys/webidls/available/SpeechGrammarList.webidl
new file mode 100644
index 00000000..f1b5775a
--- /dev/null
+++ b/crates/web-sys/webidls/available/SpeechGrammarList.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Constructor, Pref="media.webspeech.recognition.enable",
+ Func="SpeechRecognition::IsAuthorized"]
+interface SpeechGrammarList {
+    readonly attribute unsigned long length;
+    [Throws]
+    getter SpeechGrammar item(unsigned long index);
+    [Throws]
+    void addFromURI(DOMString src, optional float weight);
+    [Throws]
+    void addFromString(DOMString string, optional float weight);
+};
diff --git a/crates/web-sys/webidls/available/SpeechRecognition.webidl b/crates/web-sys/webidls/available/SpeechRecognition.webidl
new file mode 100644
index 00000000..3c32f376
--- /dev/null
+++ b/crates/web-sys/webidls/available/SpeechRecognition.webidl
@@ -0,0 +1,45 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Constructor,
+ Pref="media.webspeech.recognition.enable",
+ Func="SpeechRecognition::IsAuthorized"]
+interface SpeechRecognition : EventTarget {
+    // recognition parameters
+    attribute SpeechGrammarList grammars;
+    attribute DOMString lang;
+    [Throws]
+    attribute boolean continuous;
+    attribute boolean interimResults;
+    attribute unsigned long maxAlternatives;
+    [Throws]
+    attribute DOMString serviceURI;
+
+    // methods to drive the speech interaction
+    [Throws, NeedsCallerType]
+    void start(optional MediaStream stream);
+    void stop();
+    void abort();
+
+    // event methods
+    attribute EventHandler onaudiostart;
+    attribute EventHandler onsoundstart;
+    attribute EventHandler onspeechstart;
+    attribute EventHandler onspeechend;
+    attribute EventHandler onsoundend;
+    attribute EventHandler onaudioend;
+    attribute EventHandler onresult;
+    attribute EventHandler onnomatch;
+    attribute EventHandler onerror;
+    attribute EventHandler onstart;
+    attribute EventHandler onend;
+};
diff --git a/crates/web-sys/webidls/available/SpeechRecognitionAlternative.webidl b/crates/web-sys/webidls/available/SpeechRecognitionAlternative.webidl
new file mode 100644
index 00000000..f2692404
--- /dev/null
+++ b/crates/web-sys/webidls/available/SpeechRecognitionAlternative.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="media.webspeech.recognition.enable",
+ Func="SpeechRecognition::IsAuthorized"]
+interface SpeechRecognitionAlternative {
+    readonly attribute DOMString transcript;
+    readonly attribute float confidence;
+};
diff --git a/crates/web-sys/webidls/available/SpeechRecognitionError.webidl b/crates/web-sys/webidls/available/SpeechRecognitionError.webidl
new file mode 100644
index 00000000..ddc74e88
--- /dev/null
+++ b/crates/web-sys/webidls/available/SpeechRecognitionError.webidl
@@ -0,0 +1,31 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+enum SpeechRecognitionErrorCode {
+  "no-speech",
+  "aborted",
+  "audio-capture",
+  "network",
+  "not-allowed",
+  "service-not-allowed",
+  "bad-grammar",
+  "language-not-supported"
+};
+
+[Pref="media.webspeech.recognition.enable",
+ Func="SpeechRecognition::IsAuthorized",
+ Constructor(DOMString type, optional SpeechRecognitionErrorInit eventInitDict)]
+interface SpeechRecognitionError : Event
+{
+  readonly attribute SpeechRecognitionErrorCode error;
+  readonly attribute DOMString? message;
+};
+
+dictionary SpeechRecognitionErrorInit : EventInit
+{
+  SpeechRecognitionErrorCode error = "no-speech";
+  DOMString message = "";
+};
diff --git a/crates/web-sys/webidls/available/SpeechRecognitionEvent.webidl b/crates/web-sys/webidls/available/SpeechRecognitionEvent.webidl
new file mode 100644
index 00000000..7a95323d
--- /dev/null
+++ b/crates/web-sys/webidls/available/SpeechRecognitionEvent.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+interface nsISupports;
+
+[Pref="media.webspeech.recognition.enable",
+ Func="SpeechRecognition::IsAuthorized",
+ Constructor(DOMString type, optional SpeechRecognitionEventInit eventInitDict)]
+interface SpeechRecognitionEvent : Event
+{
+  readonly attribute unsigned long resultIndex;
+  readonly attribute SpeechRecognitionResultList? results;
+  readonly attribute any interpretation;
+  readonly attribute Document? emma;
+};
+
+dictionary SpeechRecognitionEventInit : EventInit
+{
+  unsigned long resultIndex = 0;
+  SpeechRecognitionResultList? results = null;
+  any interpretation = null;
+  Document? emma = null;
+};
diff --git a/crates/web-sys/webidls/available/SpeechRecognitionResult.webidl b/crates/web-sys/webidls/available/SpeechRecognitionResult.webidl
new file mode 100644
index 00000000..c66bb9ca
--- /dev/null
+++ b/crates/web-sys/webidls/available/SpeechRecognitionResult.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="media.webspeech.recognition.enable",
+ Func="SpeechRecognition::IsAuthorized"]
+interface SpeechRecognitionResult {
+    readonly attribute unsigned long length;
+    getter SpeechRecognitionAlternative item(unsigned long index);
+    readonly attribute boolean isFinal;
+};
diff --git a/crates/web-sys/webidls/available/SpeechRecognitionResultList.webidl b/crates/web-sys/webidls/available/SpeechRecognitionResultList.webidl
new file mode 100644
index 00000000..ec182c1d
--- /dev/null
+++ b/crates/web-sys/webidls/available/SpeechRecognitionResultList.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="media.webspeech.recognition.enable",
+ Func="SpeechRecognition::IsAuthorized"]
+interface SpeechRecognitionResultList {
+    readonly attribute unsigned long length;
+    getter SpeechRecognitionResult item(unsigned long index);
+};
diff --git a/crates/web-sys/webidls/available/SpeechSynthesis.webidl b/crates/web-sys/webidls/available/SpeechSynthesis.webidl
new file mode 100644
index 00000000..f57a07b8
--- /dev/null
+++ b/crates/web-sys/webidls/available/SpeechSynthesis.webidl
@@ -0,0 +1,30 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="media.webspeech.synth.enabled"]
+interface SpeechSynthesis : EventTarget{
+  readonly attribute boolean pending;
+  readonly attribute boolean speaking;
+  readonly attribute boolean paused;
+
+  void speak(SpeechSynthesisUtterance utterance);
+  void cancel();
+  void pause();
+  void resume();
+  sequence<SpeechSynthesisVoice> getVoices();
+
+  attribute EventHandler onvoiceschanged;
+
+  [ChromeOnly]
+  // Force an utterance to end. Circumvents bad speech service implementations.
+  void forceEnd();
+};
diff --git a/crates/web-sys/webidls/available/SpeechSynthesisErrorEvent.webidl b/crates/web-sys/webidls/available/SpeechSynthesisErrorEvent.webidl
new file mode 100644
index 00000000..1388755d
--- /dev/null
+++ b/crates/web-sys/webidls/available/SpeechSynthesisErrorEvent.webidl
@@ -0,0 +1,36 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum SpeechSynthesisErrorCode {
+  "canceled",
+  "interrupted",
+  "audio-busy",
+  "audio-hardware",
+  "network",
+  "synthesis-unavailable",
+  "synthesis-failed",
+  "language-unavailable",
+  "voice-unavailable",
+  "text-too-long",
+  "invalid-argument",
+};
+
+[Constructor(DOMString type, SpeechSynthesisErrorEventInit eventInitDict),
+ Pref="media.webspeech.synth.enabled"]
+interface SpeechSynthesisErrorEvent : SpeechSynthesisEvent {
+  readonly attribute SpeechSynthesisErrorCode error;
+};
+
+dictionary SpeechSynthesisErrorEventInit : SpeechSynthesisEventInit
+{
+  required SpeechSynthesisErrorCode error;
+};
diff --git a/crates/web-sys/webidls/available/SpeechSynthesisEvent.webidl b/crates/web-sys/webidls/available/SpeechSynthesisEvent.webidl
new file mode 100644
index 00000000..310ad686
--- /dev/null
+++ b/crates/web-sys/webidls/available/SpeechSynthesisEvent.webidl
@@ -0,0 +1,31 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Constructor(DOMString type, SpeechSynthesisEventInit eventInitDict),
+ Pref="media.webspeech.synth.enabled"]
+interface SpeechSynthesisEvent : Event
+{
+  readonly attribute SpeechSynthesisUtterance utterance;
+  readonly attribute unsigned long charIndex;
+  readonly attribute unsigned long? charLength;
+  readonly attribute float elapsedTime;
+  readonly attribute DOMString? name;
+};
+
+dictionary SpeechSynthesisEventInit : EventInit
+{
+  required SpeechSynthesisUtterance utterance;
+  unsigned long charIndex = 0;
+  unsigned long? charLength = null;
+  float elapsedTime = 0;
+  DOMString name = "";
+};
diff --git a/crates/web-sys/webidls/available/SpeechSynthesisUtterance.webidl b/crates/web-sys/webidls/available/SpeechSynthesisUtterance.webidl
new file mode 100644
index 00000000..14f6e9fd
--- /dev/null
+++ b/crates/web-sys/webidls/available/SpeechSynthesisUtterance.webidl
@@ -0,0 +1,34 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="media.webspeech.synth.enabled",
+ Constructor,
+ Constructor(DOMString text)]
+interface SpeechSynthesisUtterance : EventTarget {
+  attribute DOMString text;
+  attribute DOMString lang;
+  attribute SpeechSynthesisVoice? voice;
+  attribute float volume;
+  attribute float rate;
+  attribute float pitch;
+
+  attribute EventHandler onstart;
+  attribute EventHandler onend;
+  attribute EventHandler onerror;
+  attribute EventHandler onpause;
+  attribute EventHandler onresume;
+  attribute EventHandler onmark;
+  attribute EventHandler onboundary;
+
+  [ChromeOnly]
+  readonly attribute DOMString chosenVoiceURI;
+};
diff --git a/crates/web-sys/webidls/available/SpeechSynthesisVoice.webidl b/crates/web-sys/webidls/available/SpeechSynthesisVoice.webidl
new file mode 100644
index 00000000..39ea6964
--- /dev/null
+++ b/crates/web-sys/webidls/available/SpeechSynthesisVoice.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="media.webspeech.synth.enabled"]
+interface SpeechSynthesisVoice {
+  readonly attribute DOMString voiceURI;
+  readonly attribute DOMString name;
+  readonly attribute DOMString lang;
+  readonly attribute boolean localService;
+  readonly attribute boolean default;
+};
diff --git a/crates/web-sys/webidls/available/StereoPannerNode.webidl b/crates/web-sys/webidls/available/StereoPannerNode.webidl
new file mode 100644
index 00000000..9b8b3e2f
--- /dev/null
+++ b/crates/web-sys/webidls/available/StereoPannerNode.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary StereoPannerOptions : AudioNodeOptions {
+             float pan = 0;
+};
+
+[Pref="dom.webaudio.enabled",
+ Constructor(BaseAudioContext context, optional StereoPannerOptions options)]
+interface StereoPannerNode : AudioNode {
+  readonly attribute AudioParam pan;
+};
+
+// Mozilla extension
+StereoPannerNode implements AudioNodePassThrough;
+
diff --git a/crates/web-sys/webidls/available/Storage.webidl b/crates/web-sys/webidls/available/Storage.webidl
new file mode 100644
index 00000000..b64974a2
--- /dev/null
+++ b/crates/web-sys/webidls/available/Storage.webidl
@@ -0,0 +1,35 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+* License, v. 2.0. If a copy of the MPL was not distributed with this file,
+* You can obtain one at http://mozilla.org/MPL/2.0/.
+*
+* The origin of this IDL file is
+* http://www.whatwg.org/html/#the-storage-interface
+*
+* © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+* Opera Software ASA. You are granted a license to use, reproduce
+* and create derivative works of this document.
+*/
+
+interface Storage {
+  [Throws, NeedsSubjectPrincipal]
+  readonly attribute unsigned long length;
+
+  [Throws, NeedsSubjectPrincipal]
+  DOMString? key(unsigned long index);
+
+  [Throws, NeedsSubjectPrincipal]
+  getter DOMString? getItem(DOMString key);
+
+  [Throws, NeedsSubjectPrincipal]
+  setter void setItem(DOMString key, DOMString value);
+
+  [Throws, NeedsSubjectPrincipal]
+  deleter void removeItem(DOMString key);
+
+  [Throws, NeedsSubjectPrincipal]
+  void clear();
+
+  [ChromeOnly]
+  readonly attribute boolean isSessionOnly;
+};
diff --git a/crates/web-sys/webidls/available/StorageEvent.webidl b/crates/web-sys/webidls/available/StorageEvent.webidl
new file mode 100644
index 00000000..e03f8232
--- /dev/null
+++ b/crates/web-sys/webidls/available/StorageEvent.webidl
@@ -0,0 +1,40 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * Interface for a client side storage. See
+ * http://dev.w3.org/html5/webstorage/#the-storage-event
+ * for more information.
+ *
+ * Event sent to a window when a storage area changes.
+ */
+
+[Constructor(DOMString type, optional StorageEventInit eventInitDict)]
+interface StorageEvent : Event
+{
+  readonly attribute DOMString? key;
+  readonly attribute DOMString? oldValue;
+  readonly attribute DOMString? newValue;
+  readonly attribute DOMString? url;
+  readonly attribute Storage? storageArea;
+
+  // Bug 1016053 - This is not spec compliant.
+  void initStorageEvent(DOMString type,
+                        optional boolean canBubble = false,
+                        optional boolean cancelable = false,
+                        optional DOMString? key = null,
+                        optional DOMString? oldValue = null,
+                        optional DOMString? newValue = null,
+                        optional DOMString? url = null,
+                        optional Storage? storageArea = null);
+};
+
+dictionary StorageEventInit : EventInit
+{
+  DOMString? key = null;
+  DOMString? oldValue = null;
+  DOMString? newValue = null;
+  DOMString url = "";
+  Storage? storageArea = null;
+};
diff --git a/crates/web-sys/webidls/available/StorageManager.webidl b/crates/web-sys/webidls/available/StorageManager.webidl
new file mode 100644
index 00000000..5b471585
--- /dev/null
+++ b/crates/web-sys/webidls/available/StorageManager.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://storage.spec.whatwg.org/#storagemanager
+ *
+ */
+
+[SecureContext,
+ Exposed=(Window,Worker),
+ Func="mozilla::dom::DOMPrefs::StorageManagerEnabled"]
+interface StorageManager {
+  [Throws]
+  Promise<boolean> persisted();
+
+  [Exposed=Window, Throws]
+  Promise<boolean> persist();
+
+  [Throws]
+  Promise<StorageEstimate> estimate();
+};
+
+dictionary StorageEstimate {
+  unsigned long long usage;
+  unsigned long long quota;
+};
diff --git a/crates/web-sys/webidls/available/StreamFilter.webidl b/crates/web-sys/webidls/available/StreamFilter.webidl
new file mode 100644
index 00000000..3a100c4a
--- /dev/null
+++ b/crates/web-sys/webidls/available/StreamFilter.webidl
@@ -0,0 +1,144 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/**
+ * This is a Mozilla-specific WebExtension API, which is not available to web
+ * content. It allows monitoring and filtering of HTTP response stream data.
+ *
+ * This API should currently be considered experimental, and is not defined by
+ * any standard.
+ */
+
+enum StreamFilterStatus {
+  /**
+   * The StreamFilter is not fully initialized. No methods may be called until
+   * a "start" event has been received.
+   */
+  "uninitialized",
+  /**
+   * The underlying channel is currently transferring data, which will be
+   * dispatched via "data" events.
+   */
+  "transferringdata",
+  /**
+   * The underlying channel has finished transferring data. Data may still be
+   * written via write() calls at this point.
+   */
+  "finishedtransferringdata",
+  /**
+   * Data transfer is currently suspended. It may be resumed by a call to
+   * resume(). Data may still be written via write() calls in this state.
+   */
+  "suspended",
+  /**
+   * The channel has been closed by a call to close(). No further data wlil be
+   * delivered via "data" events, and no further data may be written via
+   * write() calls.
+   */
+  "closed",
+  /**
+   * The channel has been disconnected by a call to disconnect(). All further
+   * data will be delivered directly, without passing through the filter. No
+   * further events will be dispatched, and no further data may be written by
+   * write() calls.
+   */
+  "disconnected",
+  /**
+   * An error has occurred and the channel is disconnected. The `error`
+   * property contains the details of the error.
+   */
+  "failed",
+};
+
+/**
+ * An interface which allows an extension to intercept, and optionally modify,
+ * response data from an HTTP request.
+ */
+[Exposed=(Window,System),
+ Func="mozilla::extensions::StreamFilter::IsAllowedInContext"]
+interface StreamFilter : EventTarget {
+  /**
+   * Creates a stream filter for the given add-on and the given extension ID.
+   */
+  [ChromeOnly]
+  static StreamFilter create(unsigned long long requestId, DOMString addonId);
+
+  /**
+   * Suspends processing of the request. After this is called, no further data
+   * will be delivered until the request is resumed.
+   */
+  [Throws]
+  void suspend();
+
+  /**
+   * Resumes delivery of data for a suspended request.
+   */
+  [Throws]
+  void resume();
+
+  /**
+   * Closes the request. After this is called, no more data may be written to
+   * the stream, and no further data will be delivered.
+   *
+   * This *must* be called after the consumer is finished writing data, unless
+   * disconnect() has already been called.
+   */
+  [Throws]
+  void close();
+
+  /**
+   * Disconnects the stream filter from the request. After this is called, no
+   * further data will be delivered to the filter, and any unprocessed data
+   * will be written directly to the output stream.
+   */
+  [Throws]
+  void disconnect();
+
+  /**
+   * Writes a chunk of data to the output stream. This may not be called
+   * before the "start" event has been received.
+   */
+  [Throws]
+  void write((ArrayBuffer or Uint8Array) data);
+
+  /**
+   * Returns the current status of the stream.
+   */
+  [Pure]
+  readonly attribute StreamFilterStatus status;
+
+  /**
+   * After an "error" event has been dispatched, this contains a message
+   * describing the error.
+   */
+  [Pure]
+  readonly attribute DOMString error;
+
+  /**
+   * Dispatched with a StreamFilterDataEvent whenever incoming data is
+   * available on the stream. This data will not be delivered to the output
+   * stream unless it is explicitly written via a write() call.
+   */
+  attribute EventHandler ondata;
+
+  /**
+   * Dispatched when the stream is opened, and is about to begin delivering
+   * data.
+   */
+  attribute EventHandler onstart;
+
+  /**
+   * Dispatched when the stream has closed, and has no more data to deliver.
+   * The output stream remains open and writable until close() is called.
+   */
+  attribute EventHandler onstop;
+
+  /**
+   * Dispatched when an error has occurred. No further data may be read or
+   * written after this point.
+   */
+  attribute EventHandler onerror;
+};
diff --git a/crates/web-sys/webidls/available/StreamFilterDataEvent.webidl b/crates/web-sys/webidls/available/StreamFilterDataEvent.webidl
new file mode 100644
index 00000000..961c453d
--- /dev/null
+++ b/crates/web-sys/webidls/available/StreamFilterDataEvent.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * This is a Mozilla-specific WebExtension API, which is not available to web
+ * content. It allows monitoring and filtering of HTTP response stream data.
+ *
+ * This API should currently be considered experimental, and is not defined by
+ * any standard.
+ */
+
+[Constructor(DOMString type, optional StreamFilterDataEventInit eventInitDict),
+ Func="mozilla::extensions::StreamFilter::IsAllowedInContext",
+ Exposed=(Window,System)]
+interface StreamFilterDataEvent : Event {
+  /**
+   * Contains a chunk of data read from the input stream.
+   */
+  [Pure]
+  readonly attribute ArrayBuffer data;
+};
+
+dictionary StreamFilterDataEventInit : EventInit {
+  required ArrayBuffer data;
+};
+
diff --git a/crates/web-sys/webidls/available/StyleRuleChangeEvent.webidl b/crates/web-sys/webidls/available/StyleRuleChangeEvent.webidl
new file mode 100644
index 00000000..ef35bae6
--- /dev/null
+++ b/crates/web-sys/webidls/available/StyleRuleChangeEvent.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+[ChromeOnly, Constructor(DOMString type, optional StyleRuleChangeEventInit eventInitDict)]
+interface StyleRuleChangeEvent : Event
+{
+  readonly attribute CSSStyleSheet? stylesheet;
+  readonly attribute CSSRule? rule;
+};
+
+dictionary StyleRuleChangeEventInit : EventInit
+{
+  CSSStyleSheet? stylesheet = null;
+  CSSRule? rule = null;
+};
diff --git a/crates/web-sys/webidls/available/StyleSheet.webidl b/crates/web-sys/webidls/available/StyleSheet.webidl
new file mode 100644
index 00000000..049f3d9d
--- /dev/null
+++ b/crates/web-sys/webidls/available/StyleSheet.webidl
@@ -0,0 +1,48 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/csswg/cssom/
+ */
+
+interface StyleSheet {
+  [Constant]
+  readonly attribute DOMString type;
+  [Constant, Throws]
+  readonly attribute DOMString? href;
+  // Spec says "Node", but it can go null when the node gets a new
+  // sheet.  That's also why it's not [Constant]
+  [Pure]
+  readonly attribute Node? ownerNode;
+  [Pure]
+  readonly attribute StyleSheet? parentStyleSheet;
+  [Pure]
+  readonly attribute DOMString? title;
+  [Constant, PutForwards=mediaText]
+  readonly attribute MediaList media;
+  [Pure]
+  attribute boolean disabled;
+  // The source map URL for this style sheet.  The source map URL can
+  // be found in one of two ways.
+  //
+  // If a SourceMap or X-SourceMap response header is seen, this is
+  // the value.  If both are seen, SourceMap is preferred.  Because
+  // this relies on the HTTP response, it can change if checked before
+  // the response is available -- which is why it is not [Constant].
+  //
+  // If the style sheet has the special "# sourceMappingURL=" comment,
+  // then this is the URL specified there.
+  //
+  // If the source map URL is not found by either of these methods,
+  // then this is an empty string.
+  [ChromeOnly, Pure]
+  readonly attribute DOMString sourceMapURL;
+  // The source URL for this style sheet.  If the style sheet has the
+  // special "# sourceURL=" comment, then this is the URL specified
+  // there.  If no such comment is found, then this is the empty
+  // string.
+  [ChromeOnly, Pure]
+  readonly attribute DOMString sourceURL;
+};
diff --git a/crates/web-sys/webidls/available/StyleSheetApplicableStateChangeEvent.webidl b/crates/web-sys/webidls/available/StyleSheetApplicableStateChangeEvent.webidl
new file mode 100644
index 00000000..cb196569
--- /dev/null
+++ b/crates/web-sys/webidls/available/StyleSheetApplicableStateChangeEvent.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[ChromeOnly, Constructor(DOMString type, optional StyleSheetApplicableStateChangeEventInit eventInitDict)]
+interface StyleSheetApplicableStateChangeEvent : Event
+{
+  readonly attribute CSSStyleSheet? stylesheet;
+  readonly attribute boolean applicable;
+};
+
+dictionary StyleSheetApplicableStateChangeEventInit : EventInit
+{
+  CSSStyleSheet? stylesheet = null;
+  boolean applicable = false;
+};
diff --git a/crates/web-sys/webidls/available/StyleSheetChangeEvent.webidl b/crates/web-sys/webidls/available/StyleSheetChangeEvent.webidl
new file mode 100644
index 00000000..9d04f67c
--- /dev/null
+++ b/crates/web-sys/webidls/available/StyleSheetChangeEvent.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[ChromeOnly, Constructor(DOMString type, optional StyleSheetChangeEventInit eventInitDict)]
+interface StyleSheetChangeEvent : Event
+{
+  readonly attribute CSSStyleSheet? stylesheet;
+  readonly attribute boolean documentSheet;
+};
+
+dictionary StyleSheetChangeEventInit : EventInit
+{
+  CSSStyleSheet? stylesheet = null;
+  boolean documentSheet = false;
+};
diff --git a/crates/web-sys/webidls/available/StyleSheetList.webidl b/crates/web-sys/webidls/available/StyleSheetList.webidl
new file mode 100644
index 00000000..e6091ac2
--- /dev/null
+++ b/crates/web-sys/webidls/available/StyleSheetList.webidl
@@ -0,0 +1,8 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+interface StyleSheetList {
+  readonly attribute unsigned long length;
+  getter StyleSheet? item(unsigned long index);
+};
diff --git a/crates/web-sys/webidls/available/SubtleCrypto.webidl b/crates/web-sys/webidls/available/SubtleCrypto.webidl
new file mode 100644
index 00000000..328447ee
--- /dev/null
+++ b/crates/web-sys/webidls/available/SubtleCrypto.webidl
@@ -0,0 +1,232 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/WebCryptoAPI/
+ */
+
+typedef DOMString KeyType;
+typedef DOMString KeyUsage;
+typedef DOMString NamedCurve;
+typedef Uint8Array BigInteger;
+
+/***** Algorithm dictionaries *****/
+
+dictionary Algorithm {
+  required DOMString name;
+};
+
+dictionary AesCbcParams : Algorithm {
+  required BufferSource iv;
+};
+
+dictionary AesCtrParams : Algorithm {
+  required BufferSource counter;
+  [EnforceRange] required octet length;
+};
+
+dictionary AesGcmParams : Algorithm {
+  required BufferSource iv;
+  BufferSource additionalData;
+  [EnforceRange] octet tagLength;
+};
+
+dictionary HmacImportParams : Algorithm {
+  required AlgorithmIdentifier hash;
+};
+
+dictionary Pbkdf2Params : Algorithm {
+  required BufferSource salt;
+  [EnforceRange] required unsigned long iterations;
+  required AlgorithmIdentifier hash;
+};
+
+dictionary RsaHashedImportParams {
+  required AlgorithmIdentifier hash;
+};
+
+dictionary AesKeyGenParams : Algorithm {
+  [EnforceRange] required unsigned short length;
+};
+
+dictionary HmacKeyGenParams : Algorithm {
+  required AlgorithmIdentifier hash;
+  [EnforceRange] unsigned long length;
+};
+
+dictionary RsaHashedKeyGenParams : Algorithm {
+  [EnforceRange] required unsigned long modulusLength;
+  required BigInteger publicExponent;
+  required AlgorithmIdentifier hash;
+};
+
+dictionary RsaOaepParams : Algorithm {
+  BufferSource label;
+};
+
+dictionary RsaPssParams : Algorithm {
+  [EnforceRange] required unsigned long saltLength;
+};
+
+dictionary DhKeyGenParams : Algorithm {
+  required BigInteger prime;
+  required BigInteger generator;
+};
+
+dictionary EcKeyGenParams : Algorithm {
+  required NamedCurve namedCurve;
+};
+
+dictionary AesDerivedKeyParams : Algorithm {
+  [EnforceRange] required unsigned long length;
+};
+
+dictionary HmacDerivedKeyParams : HmacImportParams {
+  [EnforceRange] unsigned long length;
+};
+
+dictionary EcdhKeyDeriveParams : Algorithm {
+  required CryptoKey public;
+};
+
+dictionary DhKeyDeriveParams : Algorithm {
+  required CryptoKey public;
+};
+
+dictionary DhImportKeyParams : Algorithm {
+  required BigInteger prime;
+  required BigInteger generator;
+};
+
+dictionary EcdsaParams : Algorithm {
+  required AlgorithmIdentifier hash;
+};
+
+dictionary EcKeyImportParams : Algorithm {
+  NamedCurve namedCurve;
+};
+
+dictionary HkdfParams : Algorithm {
+  required AlgorithmIdentifier hash;
+  required BufferSource salt;
+  required BufferSource info;
+};
+
+/***** JWK *****/
+
+dictionary RsaOtherPrimesInfo {
+  // The following fields are defined in Section 6.3.2.7 of JSON Web Algorithms
+  required DOMString r;
+  required DOMString d;
+  required DOMString t;
+};
+
+dictionary JsonWebKey {
+  // The following fields are defined in Section 3.1 of JSON Web Key
+  required DOMString kty;
+  DOMString use;
+  sequence<DOMString> key_ops;
+  DOMString alg;
+
+  // The following fields are defined in JSON Web Key Parameters Registration
+  boolean ext;
+
+  // The following fields are defined in Section 6 of JSON Web Algorithms
+  DOMString crv;
+  DOMString x;
+  DOMString y;
+  DOMString d;
+  DOMString n;
+  DOMString e;
+  DOMString p;
+  DOMString q;
+  DOMString dp;
+  DOMString dq;
+  DOMString qi;
+  sequence<RsaOtherPrimesInfo> oth;
+  DOMString k;
+};
+
+
+/***** The Main API *****/
+
+interface CryptoKey {
+  readonly attribute KeyType type;
+  readonly attribute boolean extractable;
+  [Cached, Constant, Throws] readonly attribute object algorithm;
+  [Cached, Constant, Frozen] readonly attribute sequence<KeyUsage> usages;
+};
+
+dictionary CryptoKeyPair {
+  required CryptoKey publicKey;
+  required CryptoKey privateKey;
+};
+
+typedef DOMString KeyFormat;
+typedef (object or DOMString) AlgorithmIdentifier;
+
+[Exposed=(Window,Worker)]
+interface SubtleCrypto {
+  [Throws]
+  Promise<any> encrypt(AlgorithmIdentifier algorithm,
+                       CryptoKey key,
+                       BufferSource data);
+  [Throws]
+  Promise<any> decrypt(AlgorithmIdentifier algorithm,
+                       CryptoKey key,
+                       BufferSource data);
+  [Throws]
+  Promise<any> sign(AlgorithmIdentifier algorithm,
+                     CryptoKey key,
+                     BufferSource data);
+  [Throws]
+  Promise<any> verify(AlgorithmIdentifier algorithm,
+                      CryptoKey key,
+                      BufferSource signature,
+                      BufferSource data);
+  [Throws]
+  Promise<any> digest(AlgorithmIdentifier algorithm,
+                      BufferSource data);
+
+  [Throws]
+  Promise<any> generateKey(AlgorithmIdentifier algorithm,
+                           boolean extractable,
+                           sequence<KeyUsage> keyUsages );
+  [Throws]
+  Promise<any> deriveKey(AlgorithmIdentifier algorithm,
+                         CryptoKey baseKey,
+                         AlgorithmIdentifier derivedKeyType,
+                         boolean extractable,
+                         sequence<KeyUsage> keyUsages );
+  [Throws]
+  Promise<any> deriveBits(AlgorithmIdentifier algorithm,
+                          CryptoKey baseKey,
+                          unsigned long length);
+
+  [Throws]
+  Promise<any> importKey(KeyFormat format,
+                         object keyData,
+                         AlgorithmIdentifier algorithm,
+                         boolean extractable,
+                         sequence<KeyUsage> keyUsages );
+  [Throws]
+  Promise<any> exportKey(KeyFormat format, CryptoKey key);
+
+  [Throws]
+  Promise<any> wrapKey(KeyFormat format,
+                       CryptoKey key,
+                       CryptoKey wrappingKey,
+                       AlgorithmIdentifier wrapAlgorithm);
+
+  [Throws]
+  Promise<any> unwrapKey(KeyFormat format,
+                         BufferSource wrappedKey,
+                         CryptoKey unwrappingKey,
+                         AlgorithmIdentifier unwrapAlgorithm,
+                         AlgorithmIdentifier unwrappedKeyAlgorithm,
+                         boolean extractable,
+                         sequence<KeyUsage> keyUsages );
+};
+
diff --git a/crates/web-sys/webidls/available/TCPServerSocket.webidl b/crates/web-sys/webidls/available/TCPServerSocket.webidl
new file mode 100644
index 00000000..06d6689d
--- /dev/null
+++ b/crates/web-sys/webidls/available/TCPServerSocket.webidl
@@ -0,0 +1,42 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * TCPServerSocket
+ *
+ * An interface to a server socket that can accept incoming connections for gaia apps.
+ */
+
+dictionary ServerSocketOptions {
+  TCPSocketBinaryType binaryType = "string";
+};
+
+[Constructor(unsigned short port, optional ServerSocketOptions options, optional unsigned short backlog = 0),
+ Func="mozilla::dom::TCPSocket::ShouldTCPSocketExist",
+ Exposed=(Window,System)]
+interface TCPServerSocket : EventTarget {
+  /**
+   * The port of this server socket object.
+   */
+  readonly attribute unsigned short localPort;
+
+  /**
+   * The "connect" event is dispatched when a client connection is accepted.
+   * The event object will be a TCPServerSocketEvent containing a TCPSocket
+   * instance, which is used for communication between client and server.
+   */
+  attribute EventHandler onconnect;
+
+  /**
+   * The "error" event will be dispatched when a listening server socket is
+   * unexpectedly disconnected.
+   */
+  attribute EventHandler onerror;
+
+  /**
+   * Close the server socket.
+   */
+  void close();
+};
diff --git a/crates/web-sys/webidls/available/TCPServerSocketEvent.webidl b/crates/web-sys/webidls/available/TCPServerSocketEvent.webidl
new file mode 100644
index 00000000..f133ae78
--- /dev/null
+++ b/crates/web-sys/webidls/available/TCPServerSocketEvent.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+[Constructor(DOMString type, optional TCPServerSocketEventInit eventInitDict),
+ Func="mozilla::dom::TCPSocket::ShouldTCPSocketExist",
+ Exposed=(Window,System)]
+interface TCPServerSocketEvent : Event {
+  readonly attribute TCPSocket socket;
+};
+
+dictionary TCPServerSocketEventInit : EventInit {
+  TCPSocket? socket = null;
+};
diff --git a/crates/web-sys/webidls/available/TCPSocket.webidl b/crates/web-sys/webidls/available/TCPSocket.webidl
new file mode 100644
index 00000000..42c6c2f7
--- /dev/null
+++ b/crates/web-sys/webidls/available/TCPSocket.webidl
@@ -0,0 +1,210 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * TCPSocket exposes a TCP client socket (no server sockets yet)
+ * to highly privileged apps. It provides a buffered, non-blocking
+ * interface for sending. For receiving, it uses an asynchronous,
+ * event handler based interface.
+ */
+
+enum TCPSocketBinaryType {
+  "arraybuffer",
+  "string"
+};
+
+dictionary SocketOptions {
+  boolean useSecureTransport = false;
+  TCPSocketBinaryType binaryType = "string";
+};
+
+enum TCPReadyState {
+  "connecting",
+  "open",
+  "closing",
+  "closed",
+};
+
+[NoInterfaceObject]
+interface LegacyMozTCPSocket {
+  /**
+   * Legacy constructor for API compatibility.
+   */
+  [Throws]
+  TCPSocket open(DOMString host, unsigned short port, optional SocketOptions options);
+
+  [Throws]
+  TCPServerSocket listen(unsigned short port, optional ServerSocketOptions options, optional unsigned short backlog = 0);
+};
+
+[Constructor(DOMString host, unsigned short port, optional SocketOptions options),
+ Func="mozilla::dom::TCPSocket::ShouldTCPSocketExist",
+ Exposed=(Window,System)]
+interface TCPSocket : EventTarget {
+  /**
+   * Upgrade an insecure connection to use TLS. Throws if the ready state is not OPEN.
+   */
+  [Throws] void upgradeToSecure();
+
+  /**
+   * The UTF16 host of this socket object.
+   */
+  readonly attribute USVString host;
+
+  /**
+   * The port of this socket object.
+   */
+  readonly attribute unsigned short port;
+
+  /**
+   * True if this socket object is an SSL socket.
+   */
+  readonly attribute boolean ssl;
+
+  /**
+   * The number of bytes which have previously been buffered by calls to
+   * send on this socket.
+   */
+  readonly attribute unsigned long long bufferedAmount;
+
+  /**
+   * Pause reading incoming data and invocations of the ondata handler until
+   * resume is called. Can be called multiple times without resuming.
+   */
+  void suspend();
+
+  /**
+   * Resume reading incoming data and invoking ondata as usual. There must be
+   * an equal number of resume as suspends that took place. Throws if the
+   * socket is not suspended.
+   */
+  [Throws]
+  void resume();
+
+  /**
+   * Close the socket.
+   */
+  void close();
+
+  /**
+   * Close the socket immediately without waiting for unsent data.
+   */
+  [ChromeOnly] void closeImmediately();
+
+  /**
+   * Write data to the socket.
+   *
+   * @param data The data to write to the socket.
+   *
+   * @return Send returns true or false as a hint to the caller that
+   *         they may either continue sending more data immediately, or
+   *         may want to wait until the other side has read some of the
+   *         data which has already been written to the socket before
+   *         buffering more. If send returns true, then less than 64k
+   *         has been buffered and it's safe to immediately write more.
+   *         If send returns false, then more than 64k has been buffered,
+   *         and the caller may wish to wait until the ondrain event
+   *         handler has been called before buffering more data by more
+   *         calls to send.
+   * 
+   * @throws Throws if the ready state is not OPEN.
+   */
+  [Throws]
+  boolean send(ByteString data);
+
+  /**
+   * Write data to the socket.
+   *
+   * @param data The data to write to the socket.
+   * @param byteOffset The offset within the data from which to begin writing.
+   * @param byteLength The number of bytes to write.
+   *                   Defaults to the byte length of the ArrayBuffer if not present,
+   *                   and clamped to (length - byteOffset).
+   *
+   * @return Send returns true or false as a hint to the caller that
+   *         they may either continue sending more data immediately, or
+   *         may want to wait until the other side has read some of the
+   *         data which has already been written to the socket before
+   *         buffering more. If send returns true, then less than 64k
+   *         has been buffered and it's safe to immediately write more.
+   *         If send returns false, then more than 64k has been buffered,
+   *         and the caller may wish to wait until the ondrain event
+   *         handler has been called before buffering more data by more
+   *         calls to send.
+   * 
+   * @throws Throws if the ready state is not OPEN.
+   */
+  [Throws]
+  boolean send(ArrayBuffer data, optional unsigned long byteOffset = 0, optional unsigned long byteLength);
+
+  /**
+   * The readyState attribute indicates which state the socket is currently
+   * in.
+   */
+  readonly attribute TCPReadyState readyState;
+
+  /**
+   * The binaryType attribute indicates which mode this socket uses for
+   * sending and receiving data. If the binaryType: "arraybuffer" option
+   * was passed to the open method that created this socket, binaryType
+   * will be "arraybuffer". Otherwise, it will be "string".
+   */
+  readonly attribute TCPSocketBinaryType binaryType;
+
+  /**
+   * The "open" event is dispatched when the connection to the server
+   * has been established. If the connection is refused, the "error" event
+   * will be dispatched, instead.
+   */
+  attribute EventHandler onopen;
+
+  /**
+   * After send has buffered more than 64k of data, it returns false to
+   * indicate that the client should pause before sending more data, to
+   * avoid accumulating large buffers. This is only advisory, and the client
+   * is free to ignore it and buffer as much data as desired, but if reducing
+   * the size of buffers is important (especially for a streaming application)
+   * the "drain" event will be dispatched once the previously-buffered data has
+   * been written to the network, at which point the client can resume calling
+   * send again.
+   */
+  attribute EventHandler ondrain;
+
+  /**
+   * The "data" event will be dispatched repeatedly and asynchronously after
+   * "open" is dispatched, every time some data was available from the server
+   * and was read. The event object will be a TCPSocketEvent; if the "arraybuffer"
+   * binaryType was passed to the constructor, the data attribute of the event
+   * object will be an ArrayBuffer. If not, it will be a normal JavaScript string,
+   * truncated at the first null byte found in the payload and the remainder
+   * interpreted as ASCII bytes.
+   *
+   * At any time, the client may choose to pause reading and receiving "data"
+   * events by calling the socket's suspend() method. Further "data" events
+   * will be paused until resume() is called.
+   */
+  attribute EventHandler ondata;
+
+  /**
+   * The "error" event will be dispatched when there is an error. The event
+   * object will be a TCPSocketErrorEvent.
+   *
+   * If an "error" event is dispatched before an "open" one, the connection
+   * was refused, and the "close" event will not be dispatched. If an "error"
+   * event is dispatched after an "open" event, the connection was lost,
+   * and a "close" event will be dispatched subsequently.
+   */
+  attribute EventHandler onerror;
+
+  /**
+   * The "close" event is dispatched once the underlying network socket
+   * has been closed, either by the server, or by the client calling
+   * close.
+   *
+   * If the "error" event was not dispatched before "close", then one of
+   * the sides cleanly closed the connection.
+   */
+  attribute EventHandler onclose;  
+};
diff --git a/crates/web-sys/webidls/available/TCPSocketErrorEvent.webidl b/crates/web-sys/webidls/available/TCPSocketErrorEvent.webidl
new file mode 100644
index 00000000..22db1b76
--- /dev/null
+++ b/crates/web-sys/webidls/available/TCPSocketErrorEvent.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* Dispatched as part of the "error" event in the following situations:
+* - if there's an error detected when the TCPSocket closes
+* - if there's an internal error while sending data
+* - if there's an error connecting to the host
+*/
+
+[Constructor(DOMString type, optional TCPSocketErrorEventInit eventInitDict),
+ Func="mozilla::dom::TCPSocket::ShouldTCPSocketExist",
+ Exposed=(Window,System)]
+interface TCPSocketErrorEvent : Event {
+  readonly attribute DOMString name;
+  readonly attribute DOMString message;
+};
+
+dictionary TCPSocketErrorEventInit : EventInit
+{
+  DOMString name = "";
+  DOMString message = "";
+};
diff --git a/crates/web-sys/webidls/available/TCPSocketEvent.webidl b/crates/web-sys/webidls/available/TCPSocketEvent.webidl
new file mode 100644
index 00000000..6a3d6851
--- /dev/null
+++ b/crates/web-sys/webidls/available/TCPSocketEvent.webidl
@@ -0,0 +1,30 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * TCPSocketEvent is the event dispatched for all of the events described by TCPSocket,
+ * except the "error" event. It contains the socket that was associated with the event,
+ * the type of event, and the data associated with the event if the event is a "data" event.
+ */
+
+[Constructor(DOMString type, optional TCPSocketEventInit eventInitDict),
+ Func="mozilla::dom::TCPSocket::ShouldTCPSocketExist",
+ Exposed=(Window,System)]
+interface TCPSocketEvent : Event {
+  /**
+   * If the event is a "data" event, data will be the bytes read from the network;
+   * if the binaryType of the socket was "arraybuffer", this value will be of type
+   * ArrayBuffer, otherwise, it will be a ByteString.
+   *
+   * For other events, data will be an empty string.
+   */
+  //TODO: make this (ArrayBuffer or ByteString) after sorting out the rooting required. (bug 1121634)
+  readonly attribute any data;
+};
+
+dictionary TCPSocketEventInit : EventInit {
+  //TODO: make this (ArrayBuffer or ByteString) after sorting out the rooting required. (bug 1121634)
+  any data = null;
+};
diff --git a/crates/web-sys/webidls/available/TestFunctions.webidl b/crates/web-sys/webidls/available/TestFunctions.webidl
new file mode 100644
index 00000000..9c72392c
--- /dev/null
+++ b/crates/web-sys/webidls/available/TestFunctions.webidl
@@ -0,0 +1,59 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+// A dumping ground for random testing functions
+
+callback PromiseReturner = Promise<any>();
+
+[Pref="dom.expose_test_interfaces",
+ Constructor]
+interface TestFunctions {
+  [Throws]
+  static void throwUncatchableException();
+
+  // Simply returns its argument.  Can be used to test Promise
+  // argument processing behavior.
+  static Promise<any> passThroughPromise(Promise<any> arg);
+
+  // Returns whatever Promise the given PromiseReturner returned.
+  [Throws]
+  static Promise<any> passThroughCallbackPromise(PromiseReturner callback);
+
+  // Some basic tests for string binding round-tripping behavior.
+  void setStringData(DOMString arg);
+
+  // Get the string data, using an nsAString argument on the C++ side.
+  // This will just use Assign/operator=, whatever that does.
+  DOMString getStringDataAsAString();
+
+  // Get the string data, but only "length" chars of it, using an
+  // nsAString argument on the C++ side.  This will always copy on the
+  // C++ side.
+  DOMString getStringDataAsAString(unsigned long length);
+
+  // Get the string data, but only "length" chars of it, using a
+  // DOMString argument on the C++ side and trying to hand it
+  // stringbuffers.  If length not passed, use our full length.
+  DOMString getStringDataAsDOMString(optional unsigned long length);
+
+  // Functions that just punch through to mozITestInterfaceJS.idl
+  [Throws]
+  void testThrowNsresult();
+  [Throws]
+  void testThrowNsresultFromNative();
+
+  // Throws an InvalidStateError to auto-create a rejected promise.
+  [Throws]
+  static Promise<any> throwToRejectPromise();
+
+  // Some attributes for the toJSON to work with.
+  readonly attribute long one;
+  [Func="mozilla::dom::TestFunctions::ObjectFromAboutBlank"]
+  readonly attribute long two;
+
+  // Testing for how default toJSON behaves.
+  [Default] object toJSON();
+};
diff --git a/crates/web-sys/webidls/available/TestInterfaceJS.webidl b/crates/web-sys/webidls/available/TestInterfaceJS.webidl
new file mode 100644
index 00000000..2757745f
--- /dev/null
+++ b/crates/web-sys/webidls/available/TestInterfaceJS.webidl
@@ -0,0 +1,84 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+dictionary TestInterfaceJSUnionableDictionary {
+  object objectMember;
+  any anyMember;
+};
+
+[JSImplementation="@mozilla.org/dom/test-interface-js;1",
+ Pref="dom.expose_test_interfaces",
+ Constructor(optional any anyArg, optional object objectArg, optional TestInterfaceJSDictionary dictionaryArg)]
+interface TestInterfaceJS : EventTarget {
+  readonly attribute any anyArg;
+  readonly attribute object objectArg;
+  [Cached, Pure] readonly attribute TestInterfaceJSDictionary dictionaryArg;
+  attribute any anyAttr;
+  attribute object objectAttr;
+  [Cached, Pure] attribute TestInterfaceJSDictionary dictionaryAttr;
+  any pingPongAny(any arg);
+  object pingPongObject(object obj);
+  any pingPongObjectOrString((object or DOMString) objOrString);
+  TestInterfaceJSDictionary pingPongDictionary(optional TestInterfaceJSDictionary dict);
+  long pingPongDictionaryOrLong(optional (TestInterfaceJSUnionableDictionary or long) dictOrLong);
+  DOMString pingPongMap(record<DOMString, any> map);
+  long objectSequenceLength(sequence<object> seq);
+  long anySequenceLength(sequence<any> seq);
+
+  // For testing bug 968335.
+  DOMString getCallerPrincipal();
+
+  DOMString convertSVS(USVString svs);
+
+  (TestInterfaceJS or long) pingPongUnion((TestInterfaceJS or long) something);
+  (DOMString or TestInterfaceJS?) pingPongUnionContainingNull((TestInterfaceJS? or DOMString) something);
+  (TestInterfaceJS or long)? pingPongNullableUnion((TestInterfaceJS or long)? something);
+  (Location or TestInterfaceJS) returnBadUnion();
+
+  [Cached, Pure]
+  readonly attribute short cachedAttr;
+  void setCachedAttr(short n);
+  void clearCachedAttrCache();
+
+  // Test for sequence overloading and union behavior
+  void testSequenceOverload(sequence<DOMString> arg);
+  void testSequenceOverload(DOMString arg);
+
+  void testSequenceUnion((sequence<DOMString> or DOMString) arg);
+
+  // Tests for exception-throwing behavior
+  [Throws]
+  void testThrowError();
+
+  [Throws]
+  void testThrowDOMException();
+
+  [Throws]
+  void testThrowTypeError();
+
+  [Throws]
+  void testThrowCallbackError(Function callback);
+
+  [Throws]
+  void testThrowXraySelfHosted();
+
+  [Throws]
+  void testThrowSelfHosted();
+
+  // Tests for promise-rejection behavior
+  Promise<void> testPromiseWithThrowingChromePromiseInit();
+  Promise<void> testPromiseWithThrowingContentPromiseInit(Function func);
+  Promise<void> testPromiseWithDOMExceptionThrowingPromiseInit();
+  Promise<void> testPromiseWithThrowingChromeThenFunction();
+  Promise<void> testPromiseWithThrowingContentThenFunction(AnyCallback func);
+  Promise<void> testPromiseWithDOMExceptionThrowingThenFunction();
+  Promise<void> testPromiseWithThrowingChromeThenable();
+  Promise<void> testPromiseWithThrowingContentThenable(object thenable);
+  Promise<void> testPromiseWithDOMExceptionThrowingThenable();
+
+  // Event handler tests
+  attribute EventHandler onsomething;
+};
diff --git a/crates/web-sys/webidls/available/TestInterfaceJSDictionaries.webidl b/crates/web-sys/webidls/available/TestInterfaceJSDictionaries.webidl
new file mode 100644
index 00000000..366864a8
--- /dev/null
+++ b/crates/web-sys/webidls/available/TestInterfaceJSDictionaries.webidl
@@ -0,0 +1,27 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+//
+// These dictionaries are in a separate WebIDL file to avoid circular include
+// problems. One of the dictionary includes a union as a member, so that
+// dictionary's header needs to include UnionTypes.h. But the API in
+// TestInterfaceJS also declares a union of dictionaries, so _that_
+// dictionary's header needs to be included _by_ UnionTypes.h. The solution
+// is to separate those two dictionaries into separate header files.
+//
+
+dictionary TestInterfaceJSDictionary2 {
+  object innerObject;
+};
+
+dictionary TestInterfaceJSDictionary {
+  TestInterfaceJSDictionary2 innerDictionary;
+  object objectMember;
+  any anyMember;
+  (object or DOMString) objectOrStringMember;
+  sequence<any> anySequenceMember;
+};
+
diff --git a/crates/web-sys/webidls/available/TestInterfaceJSMaplikeSetlikeIterable.webidl b/crates/web-sys/webidls/available/TestInterfaceJSMaplikeSetlikeIterable.webidl
new file mode 100644
index 00000000..9a953784
--- /dev/null
+++ b/crates/web-sys/webidls/available/TestInterfaceJSMaplikeSetlikeIterable.webidl
@@ -0,0 +1,68 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Constructor(),
+ Pref="dom.expose_test_interfaces"]
+interface TestInterfaceMaplike {
+  maplike<DOMString, long>;
+  void setInternal(DOMString aKey, long aValue);
+  void clearInternal();
+  boolean deleteInternal(DOMString aKey);
+  boolean hasInternal(DOMString aKey);
+};
+
+[Constructor(),
+ Pref="dom.expose_test_interfaces"]
+interface TestInterfaceMaplikeObject {
+  readonly maplike<DOMString, TestInterfaceMaplike>;
+  void setInternal(DOMString aKey);
+  void clearInternal();
+  boolean deleteInternal(DOMString aKey);
+  boolean hasInternal(DOMString aKey);
+};
+
+[Pref="dom.expose_test_interfaces",
+ JSImplementation="@mozilla.org/dom/test-interface-js-maplike;1",
+ Constructor()]
+interface TestInterfaceJSMaplike {
+  readonly maplike<DOMString, long>;
+  void setInternal(DOMString aKey, long aValue);
+  void clearInternal();
+  boolean deleteInternal(DOMString aKey);
+};
+
+[Constructor(),
+ Pref="dom.expose_test_interfaces"]
+interface TestInterfaceSetlike {
+  setlike<DOMString>;
+};
+
+[Constructor(),
+ Pref="dom.expose_test_interfaces"]
+interface TestInterfaceSetlikeNode {
+  setlike<Node>;
+};
+
+[Constructor(),
+ Pref="dom.expose_test_interfaces"]
+interface TestInterfaceIterableSingle {
+  iterable<long>;
+  getter long(unsigned long index);
+  readonly attribute unsigned long length;
+};
+
+[Constructor(),
+ Pref="dom.expose_test_interfaces"]
+interface TestInterfaceIterableDouble {
+  iterable<DOMString, DOMString>;
+};
+
+[Constructor(),
+ Pref="dom.expose_test_interfaces"]
+interface TestInterfaceIterableDoubleUnion {
+  iterable<DOMString, (DOMString or long)>;
+};
+
diff --git a/crates/web-sys/webidls/available/Text.webidl b/crates/web-sys/webidls/available/Text.webidl
new file mode 100644
index 00000000..61041149
--- /dev/null
+++ b/crates/web-sys/webidls/available/Text.webidl
@@ -0,0 +1,26 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/2012/WD-dom-20120105/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Constructor(optional DOMString data = "")]
+interface Text : CharacterData {
+  [Throws]
+  Text splitText(unsigned long offset);
+  [Throws]
+  readonly attribute DOMString wholeText;
+};
+
+partial interface Text {
+  [BinaryName="assignedSlotByMode", Func="nsTextNode::IsShadowDOMEnabled"]
+  readonly attribute HTMLSlotElement? assignedSlot;
+};
+
+Text implements GeometryUtils;
diff --git a/crates/web-sys/webidls/available/TextClause.webidl b/crates/web-sys/webidls/available/TextClause.webidl
new file mode 100644
index 00000000..2baeeb2d
--- /dev/null
+++ b/crates/web-sys/webidls/available/TextClause.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[ChromeOnly]
+interface TextClause
+{
+  // The start offset of TextClause
+  readonly attribute long startOffset;
+
+  // The end offset of TextClause
+  readonly attribute long endOffset;
+
+  // If the TextClause is Caret or not
+  readonly attribute boolean isCaret;
+
+  // If the TextClause is TargetClause or not
+  readonly attribute boolean isTargetClause;
+};
diff --git a/crates/web-sys/webidls/available/TextDecoder.webidl b/crates/web-sys/webidls/available/TextDecoder.webidl
new file mode 100644
index 00000000..3fff4a25
--- /dev/null
+++ b/crates/web-sys/webidls/available/TextDecoder.webidl
@@ -0,0 +1,31 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://encoding.spec.whatwg.org/#interface-textdecoder
+ *
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+[Constructor(optional DOMString label = "utf-8", optional TextDecoderOptions options),
+ Exposed=(Window,Worker,System)]
+interface TextDecoder {
+  [Constant]
+  readonly attribute DOMString encoding;
+  [Constant]
+  readonly attribute boolean fatal;
+  [Throws]
+  USVString decode(optional BufferSource input, optional TextDecodeOptions options);
+};
+
+dictionary TextDecoderOptions {
+  boolean fatal = false;
+};
+
+dictionary TextDecodeOptions {
+  boolean stream = false;
+};
+
diff --git a/crates/web-sys/webidls/available/TextEncoder.webidl b/crates/web-sys/webidls/available/TextEncoder.webidl
new file mode 100644
index 00000000..27f6e03d
--- /dev/null
+++ b/crates/web-sys/webidls/available/TextEncoder.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://encoding.spec.whatwg.org/#interface-textencoder
+ *
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+[Constructor,
+ Exposed=(Window,Worker,System)]
+interface TextEncoder {
+  [Constant]
+  readonly attribute DOMString encoding;
+  /*
+   * This is spec-wise USVString but marking it as
+   * DOMString to avoid duplicate work. Since the
+   * UTF-16 to UTF-8 converter performs processing
+   * that's equivalent to first converting a
+   * DOMString to a USVString, let's avoid having
+   * the binding code doing it, too.
+   */
+  [NewObject]
+  Uint8Array encode(optional DOMString input = "");
+};
diff --git a/crates/web-sys/webidls/available/TextTrack.webidl b/crates/web-sys/webidls/available/TextTrack.webidl
new file mode 100644
index 00000000..442a1667
--- /dev/null
+++ b/crates/web-sys/webidls/available/TextTrack.webidl
@@ -0,0 +1,48 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#texttrack
+ */
+
+enum TextTrackKind {
+  "subtitles",
+  "captions",
+  "descriptions",
+  "chapters",
+  "metadata"
+};
+
+enum TextTrackMode {
+  "disabled",
+  "hidden",
+  "showing"
+};
+
+interface TextTrack : EventTarget {
+  readonly attribute TextTrackKind kind;
+  readonly attribute DOMString label;
+  readonly attribute DOMString language;
+
+  readonly attribute DOMString id;
+  readonly attribute DOMString inBandMetadataTrackDispatchType;
+
+           attribute TextTrackMode mode;
+
+  readonly attribute TextTrackCueList? cues;
+  readonly attribute TextTrackCueList? activeCues;
+
+  void addCue(VTTCue cue);
+  [Throws]
+  void removeCue(VTTCue cue);
+
+           attribute EventHandler oncuechange;
+};
+
+// Mozilla Extensions
+partial interface TextTrack {
+  [ChromeOnly]
+  readonly attribute TextTrackList? textTrackList;
+};
diff --git a/crates/web-sys/webidls/available/TextTrackCue.webidl b/crates/web-sys/webidls/available/TextTrackCue.webidl
new file mode 100644
index 00000000..2dc242dd
--- /dev/null
+++ b/crates/web-sys/webidls/available/TextTrackCue.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://html.spec.whatwg.org/#texttrackcue
+ */
+
+interface TextTrackCue : EventTarget {
+  readonly attribute TextTrack? track;
+
+  attribute DOMString id;
+  attribute double startTime;
+  attribute double endTime;
+  attribute boolean pauseOnExit;
+
+  attribute EventHandler onenter;
+  attribute EventHandler onexit;
+};
diff --git a/crates/web-sys/webidls/available/TextTrackCueList.webidl b/crates/web-sys/webidls/available/TextTrackCueList.webidl
new file mode 100644
index 00000000..0854004b
--- /dev/null
+++ b/crates/web-sys/webidls/available/TextTrackCueList.webidl
@@ -0,0 +1,14 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#texttrackcuelist
+ */
+
+interface TextTrackCueList {
+  readonly attribute unsigned long length;
+  getter VTTCue (unsigned long index);
+  VTTCue? getCueById(DOMString id);
+};
diff --git a/crates/web-sys/webidls/available/TextTrackList.webidl b/crates/web-sys/webidls/available/TextTrackList.webidl
new file mode 100644
index 00000000..1150871e
--- /dev/null
+++ b/crates/web-sys/webidls/available/TextTrackList.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#texttracklist
+ */
+
+interface TextTrackList : EventTarget {
+  readonly attribute unsigned long length;
+  getter TextTrack (unsigned long index);
+  TextTrack? getTrackById(DOMString id);
+
+           attribute EventHandler onchange;
+           attribute EventHandler onaddtrack;
+           attribute EventHandler onremovetrack;
+};
+
+// Mozilla extensions
+partial interface TextTrackList {
+  [ChromeOnly]
+  readonly attribute HTMLMediaElement? mediaElement;
+};
diff --git a/crates/web-sys/webidls/available/TimeEvent.webidl b/crates/web-sys/webidls/available/TimeEvent.webidl
new file mode 100644
index 00000000..8bbe4db5
--- /dev/null
+++ b/crates/web-sys/webidls/available/TimeEvent.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface please see
+ * http://dev.w3.org/2006/webapi/DOM-Level-3-Events/html/DOM3-Events.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface TimeEvent : Event
+{
+  readonly attribute long         detail;
+  readonly attribute WindowProxy? view;
+  void initTimeEvent(DOMString aType,
+                     optional Window? aView = null,
+                     optional long aDetail = 0);
+};
diff --git a/crates/web-sys/webidls/available/TimeRanges.webidl b/crates/web-sys/webidls/available/TimeRanges.webidl
new file mode 100644
index 00000000..9f9b5270
--- /dev/null
+++ b/crates/web-sys/webidls/available/TimeRanges.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#timeranges
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+interface TimeRanges {
+  readonly attribute unsigned long length;
+
+  [Throws]
+  double start(unsigned long index);
+
+  [Throws]
+  double end(unsigned long index);
+};
diff --git a/crates/web-sys/webidls/available/Touch.webidl b/crates/web-sys/webidls/available/Touch.webidl
new file mode 100644
index 00000000..d00e4665
--- /dev/null
+++ b/crates/web-sys/webidls/available/Touch.webidl
@@ -0,0 +1,49 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/webevents/raw-file/default/touchevents.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary TouchInit {
+  required long identifier;
+  required EventTarget target;
+  long clientX = 0;
+  long clientY = 0;
+  long screenX = 0;
+  long screenY = 0;
+  long pageX = 0;
+  long pageY = 0;
+  float radiusX = 0;
+  float radiusY = 0;
+  float rotationAngle = 0;
+  float force = 0;
+};
+
+[Constructor(TouchInit touchInitDict), 
+ Func="mozilla::dom::Touch::PrefEnabled"]
+interface Touch {
+  readonly    attribute long         identifier;
+  readonly    attribute EventTarget? target;
+  [NeedsCallerType]
+  readonly    attribute long         screenX;
+  [NeedsCallerType]
+  readonly    attribute long         screenY;
+  readonly    attribute long         clientX;
+  readonly    attribute long         clientY;
+  readonly    attribute long         pageX;
+  readonly    attribute long         pageY;
+  [NeedsCallerType]
+  readonly    attribute long         radiusX;
+  [NeedsCallerType]
+  readonly    attribute long         radiusY;
+  [NeedsCallerType]
+  readonly    attribute float        rotationAngle;
+  [NeedsCallerType]
+  readonly    attribute float        force;
+};
diff --git a/crates/web-sys/webidls/available/TouchEvent.webidl b/crates/web-sys/webidls/available/TouchEvent.webidl
new file mode 100644
index 00000000..fd677787
--- /dev/null
+++ b/crates/web-sys/webidls/available/TouchEvent.webidl
@@ -0,0 +1,37 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+dictionary TouchEventInit : EventModifierInit {
+  sequence<Touch> touches = [];
+  sequence<Touch> targetTouches = [];
+  sequence<Touch> changedTouches = [];
+};
+
+[Constructor(DOMString type, optional TouchEventInit eventInitDict),
+ Func="mozilla::dom::TouchEvent::PrefEnabled"]
+interface TouchEvent : UIEvent {
+  readonly attribute TouchList touches;
+  readonly attribute TouchList targetTouches;
+  readonly attribute TouchList changedTouches;
+
+  readonly attribute boolean altKey;
+  readonly attribute boolean metaKey;
+  readonly attribute boolean ctrlKey;
+  readonly attribute boolean shiftKey;
+
+  void initTouchEvent(DOMString type,
+                      optional boolean canBubble = false,
+                      optional boolean cancelable = false,
+                      optional Window? view = null,
+                      optional long detail = 0,
+                      optional boolean ctrlKey = false,
+                      optional boolean altKey = false,
+                      optional boolean shiftKey = false,
+                      optional boolean metaKey = false,
+                      optional TouchList? touches = null,
+                      optional TouchList? targetTouches = null,
+                      optional TouchList? changedTouches = null);
+};
diff --git a/crates/web-sys/webidls/available/TouchList.webidl b/crates/web-sys/webidls/available/TouchList.webidl
new file mode 100644
index 00000000..562a7fb4
--- /dev/null
+++ b/crates/web-sys/webidls/available/TouchList.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/webevents/raw-file/v1/touchevents.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Func="mozilla::dom::TouchList::PrefEnabled"]
+interface TouchList {
+  [Pure]
+  readonly attribute unsigned long length;
+  getter Touch? item(unsigned long index);
+};
diff --git a/crates/web-sys/webidls/available/TrackEvent.webidl b/crates/web-sys/webidls/available/TrackEvent.webidl
new file mode 100644
index 00000000..2daa2f45
--- /dev/null
+++ b/crates/web-sys/webidls/available/TrackEvent.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#trackevent
+ */
+
+[Constructor(DOMString type, optional TrackEventInit eventInitDict)]
+interface TrackEvent : Event
+{
+  readonly attribute (VideoTrack or AudioTrack or TextTrack)? track;
+};
+
+dictionary TrackEventInit : EventInit
+{
+  (VideoTrack or AudioTrack or TextTrack)? track = null;
+};
diff --git a/crates/web-sys/webidls/available/TransceiverImpl.webidl b/crates/web-sys/webidls/available/TransceiverImpl.webidl
new file mode 100644
index 00000000..0883ea34
--- /dev/null
+++ b/crates/web-sys/webidls/available/TransceiverImpl.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * PeerConnection.js' interface to the C++ TransceiverImpl.
+ *
+ * Do not confuse with RTCRtpTransceiver. This interface is purely for
+ * communication between the PeerConnection JS DOM binding and the C++
+ * implementation.
+ *
+ * See media/webrtc/signaling/src/peerconnection/TransceiverImpl.h
+ *
+ */
+
+// Constructed by PeerConnectionImpl::CreateTransceiverImpl.
+[ChromeOnly]
+interface TransceiverImpl {
+  MediaStreamTrack getReceiveTrack();
+  [Throws]
+  void syncWithJS(RTCRtpTransceiver transceiver);
+};
+
diff --git a/crates/web-sys/webidls/available/TransitionEvent.webidl b/crates/web-sys/webidls/available/TransitionEvent.webidl
new file mode 100644
index 00000000..d4476dff
--- /dev/null
+++ b/crates/web-sys/webidls/available/TransitionEvent.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * Transition events are defined in:
+ * http://www.w3.org/TR/css3-transitions/#transition-events-
+ * http://dev.w3.org/csswg/css3-transitions/#transition-events-
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Constructor(DOMString type, optional TransitionEventInit eventInitDict)]
+interface TransitionEvent : Event {
+  readonly attribute DOMString propertyName;
+  readonly attribute float     elapsedTime;
+  readonly attribute DOMString pseudoElement;
+};
+
+dictionary TransitionEventInit : EventInit {
+  DOMString propertyName = "";
+  float elapsedTime = 0;
+  DOMString pseudoElement = "";
+};
diff --git a/crates/web-sys/webidls/available/TreeBoxObject.webidl b/crates/web-sys/webidls/available/TreeBoxObject.webidl
new file mode 100644
index 00000000..397e2b8c
--- /dev/null
+++ b/crates/web-sys/webidls/available/TreeBoxObject.webidl
@@ -0,0 +1,196 @@
+
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+interface MozTreeView;
+interface nsIScriptableRegion;
+
+dictionary TreeCellInfo {
+    long row = 0;
+    TreeColumn? col = null;
+    DOMString childElt = "";
+};
+
+[NoInterfaceObject]
+interface TreeBoxObject : BoxObject {
+
+  /**
+   * Obtain the columns.
+   */
+  readonly attribute TreeColumns? columns;
+
+  /**
+   * The view that backs the tree and that supplies it with its data.
+   * It is dynamically settable, either using a view attribute on the
+   * tree tag or by setting this attribute to a new value.
+   */
+  [SetterThrows, NeedsCallerType]
+  attribute MozTreeView? view;
+
+  /**
+   * Whether or not we are currently focused.
+   */
+  attribute boolean focused;
+
+  /**
+   * Obtain the treebody content node
+   */
+  readonly attribute Element? treeBody;
+
+  /**
+   * Obtain the height of a row.
+   */
+  readonly attribute long rowHeight;
+
+  /**
+   * Obtain the width of a row.
+   */
+  readonly attribute long rowWidth;
+
+  /**
+   * Get the pixel position of the horizontal scrollbar.
+   */
+  readonly attribute long horizontalPosition;
+
+  /**
+   * Return the region for the visible parts of the selection, in device pixels
+   */
+  readonly attribute nsIScriptableRegion selectionRegion;
+
+  /**
+   * Get the index of the first visible row.
+   */
+  long getFirstVisibleRow();
+
+  /**
+   * Get the index of the last visible row.
+   */
+  long getLastVisibleRow();
+
+  /**
+   * Gets the number of possible visible rows.
+   */
+  long getPageLength();
+
+  /**
+   * Ensures that a row at a given index is visible.
+   */
+  void ensureRowIsVisible(long index);
+
+  /**
+   * Ensures that a given cell in the tree is visible.
+   */
+  [Throws]
+  void ensureCellIsVisible(long row, TreeColumn? col);
+
+  /**
+   * Scrolls such that the row at index is at the top of the visible view.
+   */
+  void scrollToRow(long index);
+
+  /**
+   * Scroll the tree up or down by numLines lines. Positive
+   * values move down in the tree. Prevents scrolling off the
+   * end of the tree.
+   */
+  void scrollByLines(long numLines);
+
+  /**
+   * Scroll the tree up or down by numPages pages. A page
+   * is considered to be the amount displayed by the tree.
+   * Positive values move down in the tree. Prevents scrolling
+   * off the end of the tree.
+   */
+  void scrollByPages(long numPages);
+
+  /**
+   * Invalidation methods for fine-grained painting control.
+   */
+  void invalidate();
+  void invalidateColumn(TreeColumn? col);
+  void invalidateRow(long index);
+  void invalidateCell(long row, TreeColumn? col);
+  void invalidateRange(long startIndex, long endIndex);
+
+  /**
+   * A hit test that can tell you what row the mouse is over.
+   * returns -1 for invalid mouse coordinates.
+   *
+   * The coordinate system is the client coordinate system for the
+   * document this boxObject lives in, and the units are CSS pixels.
+   */
+  long getRowAt(long x, long y);
+
+  /**
+   * A hit test that can tell you what cell the mouse is over.
+   * TreeCellInfo.row is the row index hit,  returns -1 for invalid mouse
+   * coordinates.  TreeCellInfo.col is the column hit.
+   * TreeCellInfo.childElt is the pseudoelement hit: this can have values of
+   * "cell", "twisty", "image", and "text".
+   *
+   * The coordinate system is the client coordinate system for the
+   * document this boxObject lives in, and the units are CSS pixels.
+   */
+  [Throws]
+  TreeCellInfo getCellAt(long x, long y);
+
+  /**
+   * DEPRECATED: please use above version
+   */
+  [Throws]
+  void getCellAt(long x, long y, object row, object column, object childElt);
+
+  /**
+   * Find the coordinates of an element within a specific cell.
+   */
+  [Throws]
+  DOMRect? getCoordsForCellItem(long row, TreeColumn col, DOMString element);
+
+  /**
+   * DEPRECATED: Please use above version
+   */
+  [Throws]
+  void getCoordsForCellItem(long row, TreeColumn col, DOMString element,
+                            object x, object y, object width, object height);
+
+  /**
+   * Determine if the text of a cell is being cropped or not.
+   */
+  [Throws]
+  boolean isCellCropped(long row, TreeColumn? col);
+
+  /**
+   * The view is responsible for calling these notification methods when
+   * rows are added or removed.  Index is the position at which the new
+   * rows were added or at which rows were removed.  For
+   * non-contiguous additions/removals, this method should be called multiple times.
+   */
+  void rowCountChanged(long index, long count);
+
+  /**
+   * Notify the tree that the view is about to perform a batch
+   * update, that is, add, remove or invalidate several rows at once.
+   * This must be followed by calling endUpdateBatch(), otherwise the tree
+   * will get out of sync.
+   */
+  void beginUpdateBatch();
+
+  /**
+   * Notify the tree that the view has completed a batch update.
+   */
+  void endUpdateBatch();
+
+  /**
+   * Called on a theme switch to flush out the tree's style and image caches.
+   */
+  void clearStyleAndImageCaches();
+
+  /**
+   * Remove an image source from the image cache to allow its invalidation.
+   */
+  [Throws]
+  void removeImageCacheEntry(long row, TreeColumn col);
+};
diff --git a/crates/web-sys/webidls/available/TreeColumn.webidl b/crates/web-sys/webidls/available/TreeColumn.webidl
new file mode 100644
index 00000000..c65f73c9
--- /dev/null
+++ b/crates/web-sys/webidls/available/TreeColumn.webidl
@@ -0,0 +1,35 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+[Func="IsChromeOrXBL"]
+interface TreeColumn {
+  readonly attribute Element element;
+
+  readonly attribute TreeColumns? columns;
+
+  [Throws]
+  readonly attribute long x;
+  [Throws]
+  readonly attribute long width;
+
+  readonly attribute DOMString id;
+  readonly attribute long index;
+
+  readonly attribute boolean primary;
+  readonly attribute boolean cycler;
+  readonly attribute boolean editable;
+  readonly attribute boolean selectable;
+
+  const short TYPE_TEXT                = 1;
+  const short TYPE_CHECKBOX            = 2;
+  const short TYPE_PROGRESSMETER       = 3;
+  const short TYPE_PASSWORD            = 4;
+  readonly attribute short type;
+
+  TreeColumn? getNext();
+  TreeColumn? getPrevious();
+
+  [Throws]
+  void invalidate();
+};
diff --git a/crates/web-sys/webidls/available/TreeColumns.webidl b/crates/web-sys/webidls/available/TreeColumns.webidl
new file mode 100644
index 00000000..5958d123
--- /dev/null
+++ b/crates/web-sys/webidls/available/TreeColumns.webidl
@@ -0,0 +1,54 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+[Func="IsChromeOrXBL"]
+interface TreeColumns {
+  /**
+   * The tree widget for these columns.
+   */
+  readonly attribute TreeBoxObject? tree;
+
+  /**
+   * The number of columns.
+   */
+  readonly attribute unsigned long count;
+
+  /**
+   * An alias for count (for the benefit of scripts which treat this as an
+   * array).
+   */
+  readonly attribute unsigned long length;
+
+  /**
+   * Get the first/last column.
+   */
+  TreeColumn? getFirstColumn();
+  TreeColumn? getLastColumn();
+
+  /**
+   * Attribute based column getters.
+   */
+  TreeColumn? getPrimaryColumn();
+  TreeColumn? getSortedColumn();
+  TreeColumn? getKeyColumn();
+
+  /**
+   * Get the column for the given element.
+   */
+  TreeColumn? getColumnFor(Element? element);
+
+  /**
+   * Parametric column getters.
+   */
+  getter TreeColumn? getNamedColumn(DOMString name);
+  getter TreeColumn? getColumnAt(unsigned long index);
+
+  /**
+   * This method is called whenever a treecol is added or removed and
+   * the column cache needs to be rebuilt.
+   */
+  void invalidateColumns();
+
+  void restoreNaturalOrder();
+};
diff --git a/crates/web-sys/webidls/available/TreeContentView.webidl b/crates/web-sys/webidls/available/TreeContentView.webidl
new file mode 100644
index 00000000..954a8268
--- /dev/null
+++ b/crates/web-sys/webidls/available/TreeContentView.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+[Func="IsChromeOrXBL"]
+interface TreeContentView
+{
+  /**
+   * Retrieve the content item associated with the specified row.
+   */
+  [Throws]
+  Element? getItemAtIndex(long row);
+
+  /**
+   * Retrieve the index associated with the specified content item.
+   */
+  long getIndexOfItem(Element? item);
+};
+TreeContentView implements TreeView;
diff --git a/crates/web-sys/webidls/available/TreeView.webidl b/crates/web-sys/webidls/available/TreeView.webidl
new file mode 100644
index 00000000..523cb933
--- /dev/null
+++ b/crates/web-sys/webidls/available/TreeView.webidl
@@ -0,0 +1,212 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+interface nsITreeSelection;
+
+[NoInterfaceObject]
+interface TreeView
+{
+  /**
+   * The total number of rows in the tree (including the offscreen rows).
+   */
+  readonly attribute long rowCount;
+
+  /**
+   * The selection for this view.
+   */
+  [SetterThrows]
+  attribute nsITreeSelection? selection;
+
+  /** 
+   * A whitespace delimited list of properties.  For each property X the view
+   * gives back will cause the pseudoclasses  ::-moz-tree-cell(x),
+   * ::-moz-tree-row(x), ::-moz-tree-twisty(x), ::-moz-tree-image(x),
+   * ::-moz-tree-cell-text(x).  to be matched on the pseudoelement
+   * ::moz-tree-row.
+   */
+  [Throws]
+  DOMString getRowProperties(long row);
+
+  /**
+   * A whitespace delimited list of properties for a given cell.  Each
+   * property, x, that the view gives back will cause the pseudoclasses
+   *  ::-moz-tree-cell(x), ::-moz-tree-row(x), ::-moz-tree-twisty(x),
+   *  ::-moz-tree-image(x), ::-moz-tree-cell-text(x). to be matched on the
+   *  cell.
+   */
+  [Throws]
+  DOMString getCellProperties(long row, TreeColumn column);
+  
+  /**
+   * Called to get properties to paint a column background.  For shading the sort
+   * column, etc.
+   */
+  DOMString getColumnProperties(TreeColumn column);
+
+  /**
+   * Methods that can be used to test whether or not a twisty should be drawn,
+   * and if so, whether an open or closed twisty should be used.
+   */
+  [Throws]
+  boolean isContainer(long row);
+  [Throws]
+  boolean isContainerOpen(long row);
+  [Throws]
+  boolean isContainerEmpty(long row);
+ 
+  /**
+   * isSeparator is used to determine if the row is a separator.
+   * A value of true will result in the tree drawing a horizontal separator.
+   * The tree uses the ::moz-tree-separator pseudoclass to draw the separator.
+   */
+  [Throws]
+  boolean isSeparator(long row);
+
+  /**
+   * Specifies if there is currently a sort on any column. Used mostly by dragdrop
+   * to affect drop feedback.
+   */
+  boolean isSorted();
+  
+  const short DROP_BEFORE = -1;
+  const short DROP_ON = 0;
+  const short DROP_AFTER = 1;
+  /**
+   * Methods used by the drag feedback code to determine if a drag is allowable at
+   * the current location. To get the behavior where drops are only allowed on
+   * items, such as the mailNews folder pane, always return false when
+   * the orientation is not DROP_ON.
+   */
+  [Throws]
+  boolean canDrop(long row, long orientation, DataTransfer? dataTransfer);
+
+  /**
+   * Called when the user drops something on this view. The |orientation| param
+   * specifies before/on/after the given |row|.
+   */
+  [Throws]
+  void drop(long row, long orientation, DataTransfer? dataTransfer);
+
+  /**
+   * Methods used by the tree to draw thread lines in the tree.
+   * getParentIndex is used to obtain the index of a parent row.
+   * If there is no parent row, getParentIndex returns -1.
+   */
+  [Throws]
+  long getParentIndex(long row);
+
+  /**
+   * hasNextSibling is used to determine if the row at rowIndex has a nextSibling
+   * that occurs *after* the index specified by afterIndex.  Code that is forced
+   * to march down the view looking at levels can optimize the march by starting
+   * at afterIndex+1.
+   */
+  [Throws]
+  boolean hasNextSibling(long row, long afterIndex);
+
+  /**
+   * The level is an integer value that represents
+   * the level of indentation.  It is multiplied by the width specified in the 
+   * :moz-tree-indentation pseudoelement to compute the exact indendation.
+   */
+  [Throws]
+  long getLevel(long row);
+
+  /**
+   * The image path for a given cell. For defining an icon for a cell.
+   * If the empty string is returned, the :moz-tree-image pseudoelement
+   * will be used.
+   */
+  [Throws]
+  DOMString getImageSrc(long row, TreeColumn column);
+
+  /**
+   * The value for a given cell. This method is only called for columns
+   * of type other than |text|.
+   */
+  [Throws]
+  DOMString getCellValue(long row, TreeColumn column);
+
+  /**
+   * The text for a given cell.  If a column consists only of an image, then
+   * the empty string is returned.  
+   */
+  [Throws]
+  DOMString getCellText(long row, TreeColumn column);
+
+  /**
+   * Called during initialization to link the view to the front end box object.
+   */
+  [Throws]
+  void setTree(TreeBoxObject? tree);
+  
+  /**
+   * Called on the view when an item is opened or closed.
+   */
+  [Throws]
+  void toggleOpenState(long row);
+
+  /**
+   * Called on the view when a header is clicked.
+   */
+  [Throws]
+  void cycleHeader(TreeColumn column);
+
+  /**
+   * Should be called from a XUL onselect handler whenever the selection changes.
+   */
+  void selectionChanged();
+
+  /**
+   * Called on the view when a cell in a non-selectable cycling column (e.g., unread/flag/etc.) is clicked.
+   */
+  void cycleCell(long row, TreeColumn column);
+  
+  /**
+   * isEditable is called to ask the view if the cell contents are editable.
+   * A value of true will result in the tree popping up a text field when 
+   * the user tries to inline edit the cell.
+   */
+  [Throws]
+  boolean isEditable(long row, TreeColumn column);
+
+  /**
+   * isSelectable is called to ask the view if the cell is selectable.
+   * This method is only called if the selection style is |cell| or |text|.
+   * XXXvarga shouldn't this be called isCellSelectable?
+   */
+  [Throws]
+  boolean isSelectable(long row, TreeColumn column);
+
+  /**
+   * setCellValue is called when the value of the cell has been set by the user.
+   * This method is only called for columns of type other than |text|.
+   */
+  [Throws]
+  void setCellValue(long row, TreeColumn column, DOMString value);
+
+  /**
+   * setCellText is called when the contents of the cell have been edited by the user.
+   */   
+  [Throws]
+  void setCellText(long row, TreeColumn column, DOMString value);
+
+  /**
+   * A command API that can be used to invoke commands on the selection.  The tree
+   * will automatically invoke this method when certain keys are pressed.  For example,
+   * when the DEL key is pressed, performAction will be called with the "delete" string.
+   */
+  void performAction(DOMString action);
+
+  /**
+   * A command API that can be used to invoke commands on a specific row.
+   */
+  void performActionOnRow(DOMString action, long row);
+
+  /**
+   * A command API that can be used to invoke commands on a specific cell.
+   */
+  void performActionOnCell(DOMString action, long row, TreeColumn column);
+};
diff --git a/crates/web-sys/webidls/available/TreeWalker.webidl b/crates/web-sys/webidls/available/TreeWalker.webidl
new file mode 100644
index 00000000..2cd302f0
--- /dev/null
+++ b/crates/web-sys/webidls/available/TreeWalker.webidl
@@ -0,0 +1,37 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/2012/WD-dom-20120105/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface TreeWalker {
+  [Constant]
+  readonly attribute Node root;
+  [Constant]
+  readonly attribute unsigned long whatToShow;
+  [Constant]
+  readonly attribute NodeFilter? filter;
+  [Pure, SetterThrows]
+           attribute Node currentNode;
+
+  [Throws]
+  Node? parentNode();
+  [Throws]
+  Node? firstChild();
+  [Throws]
+  Node? lastChild();
+  [Throws]
+  Node? previousSibling();
+  [Throws]
+  Node? nextSibling();
+  [Throws]
+  Node? previousNode();
+  [Throws]
+  Node? nextNode();
+};
diff --git a/crates/web-sys/webidls/available/U2F.webidl b/crates/web-sys/webidls/available/U2F.webidl
new file mode 100644
index 00000000..29bed6f3
--- /dev/null
+++ b/crates/web-sys/webidls/available/U2F.webidl
@@ -0,0 +1,95 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is a combination of the FIDO U2F Raw Message Formats:
+ * https://www.fidoalliance.org/specs/fido-u2f-v1.1-id-20160915/fido-u2f-raw-message-formats-v1.1-id-20160915.html
+ * and the U2F JavaScript API v1.1:
+ * https://www.fidoalliance.org/specs/fido-u2f-v1.1-id-20160915/fido-u2f-javascript-api-v1.1-id-20160915.html
+ */
+
+[NoInterfaceObject]
+interface GlobalU2F {
+  [SecureContext, Throws, Pref="security.webauth.u2f"]
+  readonly attribute U2F u2f;
+};
+
+typedef unsigned short ErrorCode;
+typedef sequence<Transport> Transports;
+
+enum Transport {
+    "bt",
+    "ble",
+    "nfc",
+    "usb"
+};
+
+dictionary U2FClientData {
+    DOMString             typ; // Spelling is from the specification
+    DOMString             challenge;
+    DOMString             origin;
+    // cid_pubkey for Token Binding is not implemented
+};
+
+dictionary RegisterRequest {
+    DOMString version;
+    DOMString challenge;
+};
+
+dictionary RegisterResponse {
+    DOMString version;
+    DOMString registrationData;
+    DOMString clientData;
+
+    // From Error
+    ErrorCode? errorCode;
+    DOMString? errorMessage;
+};
+
+dictionary RegisteredKey {
+    DOMString   version;
+    DOMString   keyHandle;
+    Transports? transports;
+    DOMString?  appId;
+};
+
+dictionary SignResponse {
+    DOMString keyHandle;
+    DOMString signatureData;
+    DOMString clientData;
+
+    // From Error
+    ErrorCode? errorCode;
+    DOMString? errorMessage;
+};
+
+callback U2FRegisterCallback = void(RegisterResponse response);
+callback U2FSignCallback = void(SignResponse response);
+
+[SecureContext, Pref="security.webauth.u2f"]
+interface U2F {
+  // These enumerations are defined in the FIDO U2F Javascript API under the
+  // interface "ErrorCode" as constant integers, and also in the U2F.cpp file.
+  // Any changes to these must occur in both locations.
+  const unsigned short OK = 0;
+  const unsigned short OTHER_ERROR = 1;
+  const unsigned short BAD_REQUEST = 2;
+  const unsigned short CONFIGURATION_UNSUPPORTED = 3;
+  const unsigned short DEVICE_INELIGIBLE = 4;
+  const unsigned short TIMEOUT = 5;
+
+  [Throws]
+  void register (DOMString appId,
+                 sequence<RegisterRequest> registerRequests,
+                 sequence<RegisteredKey> registeredKeys,
+                 U2FRegisterCallback callback,
+                 optional long? opt_timeoutSeconds);
+
+  [Throws]
+  void sign (DOMString appId,
+             DOMString challenge,
+             sequence<RegisteredKey> registeredKeys,
+             U2FSignCallback callback,
+             optional long? opt_timeoutSeconds);
+};
diff --git a/crates/web-sys/webidls/available/UDPMessageEvent.webidl b/crates/web-sys/webidls/available/UDPMessageEvent.webidl
new file mode 100644
index 00000000..862f719d
--- /dev/null
+++ b/crates/web-sys/webidls/available/UDPMessageEvent.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/raw-sockets/#interface-udpmessageevent
+ */
+
+//Bug 1056444: This interface should be removed after UDPSocket.input/UDPSocket.output are ready.
+[Constructor(DOMString type, optional UDPMessageEventInit eventInitDict),
+ Pref="dom.udpsocket.enabled",
+ ChromeOnly]
+interface UDPMessageEvent : Event {
+    readonly    attribute DOMString      remoteAddress;
+    readonly    attribute unsigned short remotePort;
+    readonly    attribute any            data;
+};
+
+dictionary UDPMessageEventInit : EventInit {
+  DOMString remoteAddress = "";
+  unsigned short remotePort = 0;
+  any data = null;
+};
diff --git a/crates/web-sys/webidls/available/UDPSocket.webidl b/crates/web-sys/webidls/available/UDPSocket.webidl
new file mode 100644
index 00000000..74cede28
--- /dev/null
+++ b/crates/web-sys/webidls/available/UDPSocket.webidl
@@ -0,0 +1,40 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/2012/sysapps/tcp-udp-sockets/#interface-udpsocket
+ * http://www.w3.org/2012/sysapps/tcp-udp-sockets/#dictionary-udpoptions
+ */
+
+dictionary UDPOptions {
+    DOMString      localAddress;
+    unsigned short localPort;
+    DOMString      remoteAddress;
+    unsigned short remotePort;
+    boolean        addressReuse = true;
+    boolean        loopback = false;
+};
+
+[Constructor (optional UDPOptions options),
+ Pref="dom.udpsocket.enabled",
+ ChromeOnly]
+interface UDPSocket : EventTarget {
+    readonly    attribute DOMString?       localAddress;
+    readonly    attribute unsigned short?  localPort;
+    readonly    attribute DOMString?       remoteAddress;
+    readonly    attribute unsigned short?  remotePort;
+    readonly    attribute boolean          addressReuse;
+    readonly    attribute boolean          loopback;
+    readonly    attribute SocketReadyState readyState;
+    readonly    attribute Promise<void>    opened;
+    readonly    attribute Promise<void>    closed;
+//    readonly    attribute ReadableStream   input; //Bug 1056444: Stream API is not ready
+//    readonly    attribute WriteableStream  output; //Bug 1056444: Stream API is not ready
+                attribute EventHandler     onmessage; //Bug 1056444: use event interface before Stream API is ready
+    Promise<void> close ();
+    [Throws] void    joinMulticastGroup (DOMString multicastGroupAddress);
+    [Throws] void    leaveMulticastGroup (DOMString multicastGroupAddress);
+    [Throws] boolean send ((DOMString or Blob or ArrayBuffer or ArrayBufferView) data, optional DOMString? remoteAddress, optional unsigned short? remotePort); //Bug 1056444: use send method before Stream API is ready
+};
diff --git a/crates/web-sys/webidls/available/UIEvent.webidl b/crates/web-sys/webidls/available/UIEvent.webidl
new file mode 100644
index 00000000..0f137796
--- /dev/null
+++ b/crates/web-sys/webidls/available/UIEvent.webidl
@@ -0,0 +1,64 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface please see
+ * http://dev.w3.org/2006/webapi/DOM-Level-3-Events/html/DOM3-Events.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Constructor(DOMString type, optional UIEventInit eventInitDict)]
+interface UIEvent : Event
+{
+  readonly attribute WindowProxy? view;
+  readonly attribute long         detail;
+  void initUIEvent(DOMString aType,
+                   optional boolean aCanBubble = false,
+                   optional boolean aCancelable = false,
+                   optional Window? aView = null,
+                   optional long aDetail = 0);
+};
+
+// Additional DOM0 properties.
+partial interface UIEvent {
+  const long SCROLL_PAGE_UP = -32768;
+  const long SCROLL_PAGE_DOWN = 32768;
+
+  readonly attribute long          layerX;
+  readonly attribute long          layerY;
+  readonly attribute long          pageX;
+  readonly attribute long          pageY;
+  [NeedsCallerType]
+  readonly attribute unsigned long which;
+  readonly attribute Node?         rangeParent;
+  readonly attribute long          rangeOffset;
+};
+
+dictionary UIEventInit : EventInit
+{
+  Window? view = null;
+  long    detail = 0;
+};
+
+// NOTE: Gecko doesn't support commented out modifiers yet.
+dictionary EventModifierInit : UIEventInit
+{
+  boolean ctrlKey = false;
+  boolean shiftKey = false;
+  boolean altKey = false;
+  boolean metaKey = false;
+  boolean modifierAltGraph = false;
+  boolean modifierCapsLock = false;
+  boolean modifierFn = false;
+  boolean modifierFnLock = false;
+  // boolean modifierHyper = false;
+  boolean modifierNumLock = false;
+  boolean modifierOS = false;
+  boolean modifierScrollLock = false;
+  // boolean modifierSuper = false;
+  boolean modifierSymbol = false;
+  boolean modifierSymbolLock = false;
+};
diff --git a/crates/web-sys/webidls/available/URL.webidl b/crates/web-sys/webidls/available/URL.webidl
new file mode 100644
index 00000000..c9657b47
--- /dev/null
+++ b/crates/web-sys/webidls/available/URL.webidl
@@ -0,0 +1,56 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origins of this IDL file are
+ * http://url.spec.whatwg.org/#api
+ * http://dev.w3.org/2006/webapi/FileAPI/#creating-revoking
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Constructor(USVString url, optional USVString base),
+ Exposed=(Window,Worker,WorkerDebugger)]
+interface URL {
+  // Bug 824857: no support for stringifier attributes yet.
+  //  stringifier attribute USVString href;
+
+  // Bug 824857 should remove this.
+  stringifier;
+
+  [SetterThrows]
+  attribute USVString href;
+  [GetterThrows]
+  readonly attribute USVString origin;
+  [SetterThrows]
+           attribute USVString protocol;
+           attribute USVString username;
+           attribute USVString password;
+           attribute USVString host;
+           attribute USVString hostname;
+           attribute USVString port;
+           attribute USVString pathname;
+           attribute USVString search;
+  [SameObject]
+  readonly attribute URLSearchParams searchParams;
+           attribute USVString hash;
+
+  USVString toJSON();
+};
+
+partial interface URL {
+  [Throws]
+  static DOMString createObjectURL(Blob blob);
+  [Throws]
+  static void revokeObjectURL(DOMString url);
+  [ChromeOnly, Throws]
+  static boolean isValidURL(DOMString url);
+};
+
+// https://dvcs.w3.org/hg/html-media/raw-file/default/media-source/media-source.html
+partial interface URL {
+  [Throws]
+  static DOMString createObjectURL(MediaSource source);
+};
diff --git a/crates/web-sys/webidls/available/URLSearchParams.webidl b/crates/web-sys/webidls/available/URLSearchParams.webidl
new file mode 100644
index 00000000..2828d81d
--- /dev/null
+++ b/crates/web-sys/webidls/available/URLSearchParams.webidl
@@ -0,0 +1,31 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://url.spec.whatwg.org/#urlsearchparams
+ *
+ * To the extent possible under law, the editors have waived all copyright
+ * and related or neighboring rights to this work. In addition, as of 17
+ * February 2013, the editors have made this specification available under
+ * the Open Web Foundation Agreement Version 1.0, which is available at
+ * http://www.openwebfoundation.org/legal/the-owf-1-0-agreements/owfa-1-0.
+ */
+
+[Constructor(optional (sequence<sequence<USVString>> or record<USVString, USVString> or USVString) init = ""),
+ Exposed=(Window,Worker,WorkerDebugger,System)]
+interface URLSearchParams {
+  void append(USVString name, USVString value);
+  void delete(USVString name);
+  USVString? get(USVString name);
+  sequence<USVString> getAll(USVString name);
+  boolean has(USVString name);
+  void set(USVString name, USVString value);
+
+  [Throws]
+  void sort();
+
+  iterable<USVString, USVString>;
+  stringifier;
+};
diff --git a/crates/web-sys/webidls/available/UserProximityEvent.webidl b/crates/web-sys/webidls/available/UserProximityEvent.webidl
new file mode 100644
index 00000000..671fc462
--- /dev/null
+++ b/crates/web-sys/webidls/available/UserProximityEvent.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Pref="device.sensors.proximity.enabled", Func="nsGlobalWindowInner::DeviceSensorsEnabled", Constructor(DOMString type, optional UserProximityEventInit eventInitDict)]
+interface UserProximityEvent : Event
+{
+  readonly attribute boolean near;
+};
+
+dictionary UserProximityEventInit : EventInit
+{
+  boolean near = false;
+};
diff --git a/crates/web-sys/webidls/available/VRDisplay.webidl b/crates/web-sys/webidls/available/VRDisplay.webidl
new file mode 100644
index 00000000..43bcd3e0
--- /dev/null
+++ b/crates/web-sys/webidls/available/VRDisplay.webidl
@@ -0,0 +1,317 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+enum VREye {
+  "left",
+  "right"
+};
+
+[Pref="dom.vr.enabled",
+ HeaderFile="mozilla/dom/VRDisplay.h"]
+interface VRFieldOfView {
+  readonly attribute double upDegrees;
+  readonly attribute double rightDegrees;
+  readonly attribute double downDegrees;
+  readonly attribute double leftDegrees;
+};
+
+typedef (HTMLCanvasElement or OffscreenCanvas) VRSource;
+
+dictionary VRLayer {
+  /**
+   * XXX - When WebVR in WebWorkers is implemented, HTMLCanvasElement below
+   *       should be replaced with VRSource.
+   */
+  HTMLCanvasElement? source = null;
+
+  /**
+   * The left and right viewports contain 4 values defining the viewport
+   * rectangles within the canvas to present to the eye in UV space.
+   * [0] left offset of the viewport (0.0 - 1.0)
+   * [1] top offset of the viewport (0.0 - 1.0)
+   * [2] width of the viewport (0.0 - 1.0)
+   * [3] height of the viewport (0.0 - 1.0)
+   *
+   * When no values are passed, they will be processed as though the left
+   * and right sides of the viewport were passed:
+   *
+   * leftBounds: [0.0, 0.0, 0.5, 1.0]
+   * rightBounds: [0.5, 0.0, 0.5, 1.0]
+   */
+  sequence<float> leftBounds = [];
+  sequence<float> rightBounds = [];
+};
+
+/**
+ * Values describing the capabilities of a VRDisplay.
+ * These are expected to be static per-device/per-user.
+ */
+[Pref="dom.vr.enabled",
+ HeaderFile="mozilla/dom/VRDisplay.h"]
+interface VRDisplayCapabilities {
+  /**
+   * hasPosition is true if the VRDisplay is capable of tracking its position.
+   */
+  readonly attribute boolean hasPosition;
+
+  /**
+   * hasOrientation is true if the VRDisplay is capable of tracking its orientation.
+   */
+  readonly attribute boolean hasOrientation;
+
+  /**
+   * Whether the VRDisplay is separate from the device’s
+   * primary display. If presenting VR content will obscure
+   * other content on the device, this should be false. When
+   * false, the application should not attempt to mirror VR content
+   * or update non-VR UI because that content will not be visible.
+   */
+  readonly attribute boolean hasExternalDisplay;
+
+  /**
+   * Whether the VRDisplay is capable of presenting content to an HMD or similar device.
+   * Can be used to indicate “magic window” devices that are capable of 6DoF tracking but for
+   * which requestPresent is not meaningful. If false then calls to requestPresent should
+   * always fail, and getEyeParameters should return null.
+   */
+  readonly attribute boolean canPresent;
+
+  /**
+   * Indicates the maximum length of the array that requestPresent() will accept. MUST be 1 if
+     canPresent is true, 0 otherwise.
+   */
+  readonly attribute unsigned long maxLayers;
+};
+
+/**
+ * Values describing the the stage / play area for devices
+ * that support room-scale experiences.
+ */
+[Pref="dom.vr.enabled",
+ HeaderFile="mozilla/dom/VRDisplay.h"]
+interface VRStageParameters {
+  /**
+   * A 16-element array containing the components of a column-major 4x4
+   * affine transform matrix. This matrix transforms the sitting-space position
+   * returned by get{Immediate}Pose() to a standing-space position.
+   */
+  [Throws] readonly attribute Float32Array sittingToStandingTransform;
+
+  /**
+   * Dimensions of the play-area bounds. The bounds are defined
+   * as an axis-aligned rectangle on the floor.
+   * The center of the rectangle is at (0,0,0) in standing-space
+   * coordinates.
+   * These bounds are defined for safety purposes.
+   * Content should not require the user to move beyond these
+   * bounds; however, it is possible for the user to ignore
+   * the bounds resulting in position values outside of
+   * this rectangle.
+   */
+  readonly attribute float sizeX;
+  readonly attribute float sizeZ;
+};
+
+[Pref="dom.vr.enabled",
+ HeaderFile="mozilla/dom/VRDisplay.h"]
+interface VRPose
+{
+  /**
+   * position, linearVelocity, and linearAcceleration are 3-component vectors.
+   * position is relative to a sitting space. Transforming this point with
+   * VRStageParameters.sittingToStandingTransform converts this to standing space.
+   */
+  [Constant, Throws] readonly attribute Float32Array? position;
+  [Constant, Throws] readonly attribute Float32Array? linearVelocity;
+  [Constant, Throws] readonly attribute Float32Array? linearAcceleration;
+
+  /* orientation is a 4-entry array representing the components of a quaternion. */
+  [Constant, Throws] readonly attribute Float32Array? orientation;
+  /* angularVelocity and angularAcceleration are the components of 3-dimensional vectors. */
+  [Constant, Throws] readonly attribute Float32Array? angularVelocity;
+  [Constant, Throws] readonly attribute Float32Array? angularAcceleration;
+};
+
+[Constructor,
+ Pref="dom.vr.enabled",
+ HeaderFile="mozilla/dom/VRDisplay.h"]
+interface VRFrameData {
+  readonly attribute DOMHighResTimeStamp timestamp;
+
+  [Throws, Pure] readonly attribute Float32Array leftProjectionMatrix;
+  [Throws, Pure] readonly attribute Float32Array leftViewMatrix;
+
+  [Throws, Pure] readonly attribute Float32Array rightProjectionMatrix;
+  [Throws, Pure] readonly attribute Float32Array rightViewMatrix;
+
+  [Pure] readonly attribute VRPose pose;
+};
+
+[Constructor,
+ Pref="dom.vr.test.enabled",
+ HeaderFile="mozilla/dom/VRDisplay.h"]
+interface VRSubmitFrameResult {
+  readonly attribute unsigned long frameNum;
+  readonly attribute DOMString? base64Image;
+};
+
+[Pref="dom.vr.enabled",
+ HeaderFile="mozilla/dom/VRDisplay.h"]
+interface VREyeParameters {
+  /**
+   * offset is a 3-component vector representing an offset to
+   * translate the eye. This value may vary from frame
+   * to frame if the user adjusts their headset ipd.
+   */
+  [Constant, Throws] readonly attribute Float32Array offset;
+
+  /* These values may vary as the user adjusts their headset ipd. */
+  [Constant] readonly attribute VRFieldOfView fieldOfView;
+
+  /**
+   * renderWidth and renderHeight specify the recommended render target
+   * size of each eye viewport, in pixels. If multiple eyes are rendered
+   * in a single render target, then the render target should be made large
+   * enough to fit both viewports.
+   */
+  [Constant] readonly attribute unsigned long renderWidth;
+  [Constant] readonly attribute unsigned long renderHeight;
+};
+
+[Pref="dom.vr.enabled",
+ HeaderFile="mozilla/dom/VRDisplay.h"]
+interface VRDisplay : EventTarget {
+  /**
+   * presentingGroups is a bitmask indicating which VR session groups
+   * have an active VR presentation.
+   */
+  [ChromeOnly] readonly attribute unsigned long presentingGroups;
+  /**
+   * Setting groupMask causes submitted frames by VR sessions that
+   * aren't included in the bitmasked groups to be ignored.
+   * Non-chrome content is not aware of the value of groupMask.
+   * VRDisplay.RequestAnimationFrame will still fire for VR sessions
+   * that are hidden by groupMask, enabling their performance to be
+   * measured by chrome UI that is presented in other groups.
+   * This is expected to be used in cases where chrome UI is presenting
+   * information during link traversal or presenting options when content
+   * performance is too low for comfort.
+   * The VR refresh / VSync cycle is driven by the visible content
+   * and the non-visible content may have a throttled refresh rate.
+   */
+  [ChromeOnly] attribute unsigned long groupMask;
+
+  readonly attribute boolean isConnected;
+  readonly attribute boolean isPresenting;
+
+  /**
+   * Dictionary of capabilities describing the VRDisplay.
+   */
+  [Constant] readonly attribute VRDisplayCapabilities capabilities;
+
+  /**
+   * If this VRDisplay supports room-scale experiences, the optional
+   * stage attribute contains details on the room-scale parameters.
+   */
+  readonly attribute VRStageParameters? stageParameters;
+
+  /* Return the current VREyeParameters for the given eye. */
+  VREyeParameters getEyeParameters(VREye whichEye);
+
+  /**
+   * An identifier for this distinct VRDisplay. Used as an
+   * association point in the Gamepad API.
+   */
+  [Constant] readonly attribute unsigned long displayId;
+
+  /**
+   * A display name, a user-readable name identifying it.
+   */
+  [Constant] readonly attribute DOMString displayName;
+
+  /**
+   * Populates the passed VRFrameData with the information required to render
+   * the current frame.
+   */
+  boolean getFrameData(VRFrameData frameData);
+
+  /**
+   * Return a VRPose containing the future predicted pose of the VRDisplay
+   * when the current frame will be presented. Subsequent calls to getPose()
+   * MUST return a VRPose with the same values until the next call to
+   * submitFrame().
+   *
+   * The VRPose will contain the position, orientation, velocity,
+   * and acceleration of each of these properties.
+   */
+  [NewObject] VRPose getPose();
+
+  [Pref="dom.vr.test.enabled"]
+  boolean getSubmitFrameResult(VRSubmitFrameResult result);
+
+  /**
+   * Reset the pose for this display, treating its current position and
+   * orientation as the "origin/zero" values. VRPose.position,
+   * VRPose.orientation, and VRStageParameters.sittingToStandingTransform may be
+   * updated when calling resetPose(). This should be called in only
+   * sitting-space experiences.
+   */
+  void resetPose();
+
+  /**
+   * z-depth defining the near plane of the eye view frustum
+   * enables mapping of values in the render target depth
+   * attachment to scene coordinates. Initially set to 0.01.
+   */
+  attribute double depthNear;
+
+  /**
+   * z-depth defining the far plane of the eye view frustum
+   * enables mapping of values in the render target depth
+   * attachment to scene coordinates. Initially set to 10000.0.
+   */
+  attribute double depthFar;
+
+  /**
+   * The callback passed to `requestAnimationFrame` will be called
+   * any time a new frame should be rendered. When the VRDisplay is
+   * presenting the callback will be called at the native refresh
+   * rate of the HMD. When not presenting this function acts
+   * identically to how window.requestAnimationFrame acts. Content should
+   * make no assumptions of frame rate or vsync behavior as the HMD runs
+   * asynchronously from other displays and at differing refresh rates.
+   */
+  [Throws] long requestAnimationFrame(FrameRequestCallback callback);
+
+  /**
+   * Passing the value returned by `requestAnimationFrame` to
+   * `cancelAnimationFrame` will unregister the callback.
+   */
+  [Throws] void cancelAnimationFrame(long handle);
+
+  /**
+   * Begin presenting to the VRDisplay. Must be called in response to a user gesture.
+   * Repeat calls while already presenting will update the VRLayers being displayed.
+   */
+  [Throws, NeedsCallerType] Promise<void> requestPresent(sequence<VRLayer> layers);
+
+  /**
+   * Stops presenting to the VRDisplay.
+   */
+  [Throws] Promise<void> exitPresent();
+
+  /**
+   * Get the layers currently being presented.
+   */
+  sequence<VRLayer> getLayers();
+
+  /**
+   * The VRLayer provided to the VRDisplay will be captured and presented
+   * in the HMD. Calling this function has the same effect on the source
+   * canvas as any other operation that uses its source image, and canvases
+   * created without preserveDrawingBuffer set to true will be cleared.
+   */
+  void submitFrame();
+};
diff --git a/crates/web-sys/webidls/available/VRDisplayEvent.webidl b/crates/web-sys/webidls/available/VRDisplayEvent.webidl
new file mode 100644
index 00000000..83d39e7c
--- /dev/null
+++ b/crates/web-sys/webidls/available/VRDisplayEvent.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+enum VRDisplayEventReason {
+  "mounted",
+  "navigation",
+  "requested",
+  "unmounted",
+};
+
+dictionary VRDisplayEventInit : EventInit {
+  required VRDisplay display;
+  VRDisplayEventReason reason;
+};
+
+[Pref="dom.vr.enabled",
+ Constructor(DOMString type, VRDisplayEventInit eventInitDict)]
+interface VRDisplayEvent : Event {
+  readonly attribute VRDisplay display;
+  readonly attribute VRDisplayEventReason? reason;
+};
diff --git a/crates/web-sys/webidls/available/VRServiceTest.webidl b/crates/web-sys/webidls/available/VRServiceTest.webidl
new file mode 100644
index 00000000..fbca7df0
--- /dev/null
+++ b/crates/web-sys/webidls/available/VRServiceTest.webidl
@@ -0,0 +1,39 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This WebIDL is just for WebVR testing.
+ */
+
+[Pref="dom.vr.test.enabled",
+ HeaderFile="mozilla/dom/VRServiceTest.h"]
+interface VRMockDisplay {
+  void setEyeResolution(unsigned long aRenderWidth, unsigned long aRenderHeight);
+  void setEyeParameter(VREye eye, double offsetX, double offsetY, double offsetZ,
+                       double upDegree, double rightDegree,
+                       double downDegree, double leftDegree);
+  void setPose(Float32Array? position, Float32Array? linearVelocity,
+               Float32Array? linearAcceleration, Float32Array? orientation,
+               Float32Array? angularVelocity, Float32Array? angularAcceleration);
+  void setMountState(boolean isMounted);
+  void update();
+};
+
+[Pref="dom.vr.test.enabled",
+ HeaderFile="mozilla/dom/VRServiceTest.h"]
+interface VRMockController {
+  void newButtonEvent(unsigned long button, boolean pressed);
+  void newAxisMoveEvent(unsigned long axis, double value);
+  void newPoseMove(Float32Array? position, Float32Array? linearVelocity,
+                   Float32Array? linearAcceleration, Float32Array? orientation,
+                   Float32Array? angularVelocity, Float32Array? angularAcceleration);
+};
+
+[Pref="dom.vr.test.enabled",
+ HeaderFile="mozilla/dom/VRServiceTest.h"]
+interface VRServiceTest {
+  [Throws, NewObject]
+  Promise<VRMockDisplay> attachVRDisplay(DOMString id);
+  [Throws, NewObject]
+  Promise<VRMockController> attachVRController(DOMString id);
+};
diff --git a/crates/web-sys/webidls/available/VTTCue.webidl b/crates/web-sys/webidls/available/VTTCue.webidl
new file mode 100644
index 00000000..4f8214c2
--- /dev/null
+++ b/crates/web-sys/webidls/available/VTTCue.webidl
@@ -0,0 +1,73 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/html5/webvtt/#the-vttcue-interface
+ */
+
+enum AutoKeyword { "auto" };
+
+enum LineAlignSetting {
+  "start",
+  "center",
+  "end"
+};
+
+enum PositionAlignSetting {
+  "line-left",
+  "center",
+  "line-right",
+  "auto"
+};
+
+enum AlignSetting {
+  "start",
+  "center",
+  "end",
+  "left",
+  "right"
+};
+
+enum DirectionSetting {
+  "",
+  "rl",
+  "lr"
+};
+
+[Constructor(double startTime, double endTime, DOMString text)]
+interface VTTCue : TextTrackCue {
+  [Pref="media.webvtt.regions.enabled"]
+  attribute VTTRegion? region;
+  attribute DirectionSetting vertical;
+  attribute boolean snapToLines;
+  attribute (double or AutoKeyword) line;
+  [SetterThrows]
+  attribute LineAlignSetting lineAlign;
+  [SetterThrows]
+  attribute (double or AutoKeyword) position;
+  [SetterThrows]
+  attribute PositionAlignSetting positionAlign;
+  [SetterThrows]
+  attribute double size;
+  attribute AlignSetting align;
+  attribute DOMString text;
+  DocumentFragment getCueAsHTML();
+};
+
+// Mozilla extensions.
+partial interface VTTCue {
+  [ChromeOnly]
+  attribute HTMLDivElement? displayState;
+  [ChromeOnly]
+  readonly attribute boolean hasBeenReset;
+  [ChromeOnly]
+  readonly attribute double computedLine;
+  [ChromeOnly]
+  readonly attribute double computedPosition;
+  [ChromeOnly]
+  readonly attribute PositionAlignSetting computedPositionAlign;
+  [ChromeOnly]
+  readonly attribute boolean getActive;
+};
diff --git a/crates/web-sys/webidls/available/VTTRegion.webidl b/crates/web-sys/webidls/available/VTTRegion.webidl
new file mode 100644
index 00000000..d665cfea
--- /dev/null
+++ b/crates/web-sys/webidls/available/VTTRegion.webidl
@@ -0,0 +1,32 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/webvtt/#the-vttregion-interface
+ */
+
+enum ScrollSetting {
+  "",
+  "up"
+};
+
+[Constructor, Pref="media.webvtt.regions.enabled"]
+interface VTTRegion {
+           attribute DOMString id;
+           [SetterThrows]
+           attribute double width;
+           [SetterThrows]
+           attribute long lines;
+           [SetterThrows]
+           attribute double regionAnchorX;
+           [SetterThrows]
+           attribute double regionAnchorY;
+           [SetterThrows]
+           attribute double viewportAnchorX;
+           [SetterThrows]
+           attribute double viewportAnchorY;
+
+           attribute ScrollSetting scroll;
+};
diff --git a/crates/web-sys/webidls/available/ValidityState.webidl b/crates/web-sys/webidls/available/ValidityState.webidl
new file mode 100644
index 00000000..7e99870e
--- /dev/null
+++ b/crates/web-sys/webidls/available/ValidityState.webidl
@@ -0,0 +1,26 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#validitystate
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+interface ValidityState {
+  readonly attribute boolean valueMissing;
+  readonly attribute boolean typeMismatch;
+  readonly attribute boolean patternMismatch;
+  readonly attribute boolean tooLong;
+  readonly attribute boolean tooShort;
+  readonly attribute boolean rangeUnderflow;
+  readonly attribute boolean rangeOverflow;
+  readonly attribute boolean stepMismatch;
+  readonly attribute boolean badInput;
+  readonly attribute boolean customError;
+  readonly attribute boolean valid;
+};
+
diff --git a/crates/web-sys/webidls/available/VideoPlaybackQuality.webidl b/crates/web-sys/webidls/available/VideoPlaybackQuality.webidl
new file mode 100644
index 00000000..abbe8d19
--- /dev/null
+++ b/crates/web-sys/webidls/available/VideoPlaybackQuality.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/html-media/raw-file/default/media-source/media-source.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Func="mozilla::dom::MediaSource::Enabled"]
+interface VideoPlaybackQuality {
+  readonly attribute DOMHighResTimeStamp creationTime;
+  readonly attribute unsigned long totalVideoFrames;
+  readonly attribute unsigned long droppedVideoFrames;
+  readonly attribute unsigned long corruptedVideoFrames;
+// At Risk: readonly attribute double totalFrameDelay;
+};
+
diff --git a/crates/web-sys/webidls/available/VideoStreamTrack.webidl b/crates/web-sys/webidls/available/VideoStreamTrack.webidl
new file mode 100644
index 00000000..b194d5c9
--- /dev/null
+++ b/crates/web-sys/webidls/available/VideoStreamTrack.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2011/webrtc/editor/getusermedia.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+// [Constructor(optional MediaTrackConstraints videoConstraints)]
+interface VideoStreamTrack : MediaStreamTrack {
+//    static sequence<DOMString> getSourceIds ();
+//    void                       takePhoto ();
+//                attribute EventHandler onphoto;
+//                attribute EventHandler onphotoerror;
+};
diff --git a/crates/web-sys/webidls/available/VideoTrack.webidl b/crates/web-sys/webidls/available/VideoTrack.webidl
new file mode 100644
index 00000000..7f5974f2
--- /dev/null
+++ b/crates/web-sys/webidls/available/VideoTrack.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#videotrack
+ */
+
+[Pref="media.track.enabled"]
+interface VideoTrack {
+  readonly attribute DOMString id;
+  readonly attribute DOMString kind;
+  readonly attribute DOMString label;
+  readonly attribute DOMString language;
+           attribute boolean selected;
+};
diff --git a/crates/web-sys/webidls/available/VideoTrackList.webidl b/crates/web-sys/webidls/available/VideoTrackList.webidl
new file mode 100644
index 00000000..14412022
--- /dev/null
+++ b/crates/web-sys/webidls/available/VideoTrackList.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#videotracklist
+ */
+
+[Pref="media.track.enabled"]
+interface VideoTrackList : EventTarget {
+  readonly attribute unsigned long length;
+  getter VideoTrack (unsigned long index);
+  VideoTrack? getTrackById(DOMString id);
+  readonly attribute long selectedIndex;
+
+           attribute EventHandler onchange;
+           attribute EventHandler onaddtrack;
+           attribute EventHandler onremovetrack;
+};
+
diff --git a/crates/web-sys/webidls/available/WaveShaperNode.webidl b/crates/web-sys/webidls/available/WaveShaperNode.webidl
new file mode 100644
index 00000000..0bea44c8
--- /dev/null
+++ b/crates/web-sys/webidls/available/WaveShaperNode.webidl
@@ -0,0 +1,36 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum OverSampleType {
+  "none",
+  "2x",
+  "4x"
+};
+
+dictionary WaveShaperOptions : AudioNodeOptions {
+             sequence<float> curve;
+             OverSampleType  oversample = "none";
+};
+
+[Pref="dom.webaudio.enabled",
+ Constructor(BaseAudioContext context, optional WaveShaperOptions options)]
+interface WaveShaperNode : AudioNode {
+
+      [Cached, Pure, SetterThrows]
+      attribute Float32Array? curve;
+      attribute OverSampleType oversample;
+
+};
+
+// Mozilla extension
+WaveShaperNode implements AudioNodePassThrough;
+
diff --git a/crates/web-sys/webidls/available/WebAuthentication.webidl b/crates/web-sys/webidls/available/WebAuthentication.webidl
new file mode 100644
index 00000000..f9a6df41
--- /dev/null
+++ b/crates/web-sys/webidls/available/WebAuthentication.webidl
@@ -0,0 +1,166 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/webauthn/
+ */
+
+/***** Interfaces to Data *****/
+
+[SecureContext, Pref="security.webauth.webauthn"]
+interface PublicKeyCredential : Credential {
+    [SameObject] readonly attribute ArrayBuffer              rawId;
+    [SameObject] readonly attribute AuthenticatorResponse    response;
+    AuthenticationExtensionsClientOutputs getClientExtensionResults();
+};
+
+[SecureContext]
+partial interface PublicKeyCredential {
+    static Promise<boolean> isUserVerifyingPlatformAuthenticatorAvailable();
+};
+
+[SecureContext, Pref="security.webauth.webauthn"]
+interface AuthenticatorResponse {
+    [SameObject] readonly attribute ArrayBuffer clientDataJSON;
+};
+
+[SecureContext, Pref="security.webauth.webauthn"]
+interface AuthenticatorAttestationResponse : AuthenticatorResponse {
+    [SameObject] readonly attribute ArrayBuffer attestationObject;
+};
+
+[SecureContext, Pref="security.webauth.webauthn"]
+interface AuthenticatorAssertionResponse : AuthenticatorResponse {
+    [SameObject] readonly attribute ArrayBuffer      authenticatorData;
+    [SameObject] readonly attribute ArrayBuffer      signature;
+    [SameObject] readonly attribute ArrayBuffer?     userHandle;
+};
+
+dictionary PublicKeyCredentialParameters {
+    required PublicKeyCredentialType  type;
+    required COSEAlgorithmIdentifier  alg;
+};
+
+dictionary PublicKeyCredentialCreationOptions {
+    required PublicKeyCredentialRpEntity   rp;
+    required PublicKeyCredentialUserEntity user;
+
+    required BufferSource                            challenge;
+    required sequence<PublicKeyCredentialParameters> pubKeyCredParams;
+
+    unsigned long                                timeout;
+    sequence<PublicKeyCredentialDescriptor>      excludeCredentials = [];
+    AuthenticatorSelectionCriteria               authenticatorSelection;
+    AttestationConveyancePreference              attestation = "none";
+    AuthenticationExtensionsClientInputs         extensions;
+};
+
+dictionary PublicKeyCredentialEntity {
+    required DOMString    name;
+    USVString             icon;
+};
+
+dictionary PublicKeyCredentialRpEntity : PublicKeyCredentialEntity {
+    DOMString      id;
+};
+
+dictionary PublicKeyCredentialUserEntity : PublicKeyCredentialEntity {
+    required BufferSource   id;
+    required DOMString      displayName;
+};
+
+dictionary AuthenticatorSelectionCriteria {
+    AuthenticatorAttachment      authenticatorAttachment;
+    boolean                      requireResidentKey = false;
+    UserVerificationRequirement  userVerification = "preferred";
+};
+
+enum AuthenticatorAttachment {
+    "platform",       // Platform attachment
+    "cross-platform"  // Cross-platform attachment
+};
+
+enum AttestationConveyancePreference {
+    "none",
+    "indirect",
+    "direct"
+};
+
+enum UserVerificationRequirement {
+    "required",
+    "preferred",
+    "discouraged"
+};
+
+dictionary PublicKeyCredentialRequestOptions {
+    required BufferSource                challenge;
+    unsigned long                        timeout;
+    USVString                            rpId;
+    sequence<PublicKeyCredentialDescriptor> allowCredentials = [];
+    UserVerificationRequirement          userVerification = "preferred";
+    AuthenticationExtensionsClientInputs extensions;
+};
+
+// TODO - Use partial dictionaries when bug 1436329 is fixed.
+dictionary AuthenticationExtensionsClientInputs {
+    // FIDO AppID Extension (appid)
+    // <https://w3c.github.io/webauthn/#sctn-appid-extension>
+    USVString appid;
+};
+
+// TODO - Use partial dictionaries when bug 1436329 is fixed.
+dictionary AuthenticationExtensionsClientOutputs {
+    // FIDO AppID Extension (appid)
+    // <https://w3c.github.io/webauthn/#sctn-appid-extension>
+    boolean appid;
+};
+
+typedef record<DOMString, DOMString> AuthenticationExtensionsAuthenticatorInputs;
+
+dictionary CollectedClientData {
+    required DOMString           type;
+    required DOMString           challenge;
+    required DOMString           origin;
+    required DOMString           hashAlgorithm;
+    DOMString                    tokenBindingId;
+    AuthenticationExtensionsClientInputs clientExtensions;
+    AuthenticationExtensionsAuthenticatorInputs authenticatorExtensions;
+};
+
+enum PublicKeyCredentialType {
+    "public-key"
+};
+
+dictionary PublicKeyCredentialDescriptor {
+    required PublicKeyCredentialType      type;
+    required BufferSource                 id;
+    sequence<AuthenticatorTransport>      transports;
+};
+
+enum AuthenticatorTransport {
+    "usb",
+    "nfc",
+    "ble"
+};
+
+typedef long COSEAlgorithmIdentifier;
+
+typedef sequence<AAGUID>      AuthenticatorSelectionList;
+
+typedef BufferSource      AAGUID;
+
+/*
+// FIDO AppID Extension (appid)
+// <https://w3c.github.io/webauthn/#sctn-appid-extension>
+partial dictionary AuthenticationExtensionsClientInputs {
+    USVString appid;
+};
+
+// FIDO AppID Extension (appid)
+// <https://w3c.github.io/webauthn/#sctn-appid-extension>
+partial dictionary AuthenticationExtensionsClientOutputs {
+  boolean appid;
+};
+*/
diff --git a/crates/web-sys/webidls/available/WebComponents.webidl b/crates/web-sys/webidls/available/WebComponents.webidl
new file mode 100644
index 00000000..ab2fc9c2
--- /dev/null
+++ b/crates/web-sys/webidls/available/WebComponents.webidl
@@ -0,0 +1,27 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/custom/index.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+callback LifecycleConnectedCallback = void();
+callback LifecycleDisconnectedCallback = void();
+callback LifecycleAdoptedCallback = void(Document? oldDocument,
+                                         Document? newDocment);
+callback LifecycleAttributeChangedCallback = void(DOMString attrName,
+                                                  DOMString? oldValue,
+                                                  DOMString? newValue,
+                                                  DOMString? namespaceURI);
+
+dictionary LifecycleCallbacks {
+  LifecycleConnectedCallback connectedCallback;
+  LifecycleDisconnectedCallback disconnectedCallback;
+  LifecycleAdoptedCallback adoptedCallback;
+  LifecycleAttributeChangedCallback attributeChangedCallback;
+};
diff --git a/crates/web-sys/webidls/available/WebGL2RenderingContext.webidl b/crates/web-sys/webidls/available/WebGL2RenderingContext.webidl
new file mode 100644
index 00000000..336687ff
--- /dev/null
+++ b/crates/web-sys/webidls/available/WebGL2RenderingContext.webidl
@@ -0,0 +1,702 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The source for this IDL is found at https://www.khronos.org/registry/webgl/specs/latest/2.0
+ * This IDL depends on WebGLRenderingContext.webidl
+ */
+
+typedef long long GLint64;
+typedef unsigned long long GLuint64;
+
+[Pref="webgl.enable-webgl2"]
+interface WebGLSampler {
+};
+
+[Pref="webgl.enable-webgl2"]
+interface WebGLSync {
+};
+
+[Pref="webgl.enable-webgl2"]
+interface WebGLTransformFeedback {
+};
+
+typedef (Uint32Array or sequence<GLuint>) Uint32List;
+
+// WebGL2 spec has this as an empty interface that pulls in everything
+// via WebGL2RenderingContextBase.
+[Pref="webgl.enable-webgl2"]
+interface WebGL2RenderingContext
+{
+};
+
+[NoInterfaceObject]
+interface WebGL2RenderingContextBase
+{
+    const GLenum READ_BUFFER                                   = 0x0C02;
+    const GLenum UNPACK_ROW_LENGTH                             = 0x0CF2;
+    const GLenum UNPACK_SKIP_ROWS                              = 0x0CF3;
+    const GLenum UNPACK_SKIP_PIXELS                            = 0x0CF4;
+    const GLenum PACK_ROW_LENGTH                               = 0x0D02;
+    const GLenum PACK_SKIP_ROWS                                = 0x0D03;
+    const GLenum PACK_SKIP_PIXELS                              = 0x0D04;
+    const GLenum COLOR                                         = 0x1800;
+    const GLenum DEPTH                                         = 0x1801;
+    const GLenum STENCIL                                       = 0x1802;
+    const GLenum RED                                           = 0x1903;
+    const GLenum RGB8                                          = 0x8051;
+    const GLenum RGBA8                                         = 0x8058;
+    const GLenum RGB10_A2                                      = 0x8059;
+    const GLenum TEXTURE_BINDING_3D                            = 0x806A;
+    const GLenum UNPACK_SKIP_IMAGES                            = 0x806D;
+    const GLenum UNPACK_IMAGE_HEIGHT                           = 0x806E;
+    const GLenum TEXTURE_3D                                    = 0x806F;
+    const GLenum TEXTURE_WRAP_R                                = 0x8072;
+    const GLenum MAX_3D_TEXTURE_SIZE                           = 0x8073;
+    const GLenum UNSIGNED_INT_2_10_10_10_REV                   = 0x8368;
+    const GLenum MAX_ELEMENTS_VERTICES                         = 0x80E8;
+    const GLenum MAX_ELEMENTS_INDICES                          = 0x80E9;
+    const GLenum TEXTURE_MIN_LOD                               = 0x813A;
+    const GLenum TEXTURE_MAX_LOD                               = 0x813B;
+    const GLenum TEXTURE_BASE_LEVEL                            = 0x813C;
+    const GLenum TEXTURE_MAX_LEVEL                             = 0x813D;
+    const GLenum MIN                                           = 0x8007;
+    const GLenum MAX                                           = 0x8008;
+    const GLenum DEPTH_COMPONENT24                             = 0x81A6;
+    const GLenum MAX_TEXTURE_LOD_BIAS                          = 0x84FD;
+    const GLenum TEXTURE_COMPARE_MODE                          = 0x884C;
+    const GLenum TEXTURE_COMPARE_FUNC                          = 0x884D;
+    const GLenum CURRENT_QUERY                                 = 0x8865;
+    const GLenum QUERY_RESULT                                  = 0x8866;
+    const GLenum QUERY_RESULT_AVAILABLE                        = 0x8867;
+    const GLenum STREAM_READ                                   = 0x88E1;
+    const GLenum STREAM_COPY                                   = 0x88E2;
+    const GLenum STATIC_READ                                   = 0x88E5;
+    const GLenum STATIC_COPY                                   = 0x88E6;
+    const GLenum DYNAMIC_READ                                  = 0x88E9;
+    const GLenum DYNAMIC_COPY                                  = 0x88EA;
+    const GLenum MAX_DRAW_BUFFERS                              = 0x8824;
+    const GLenum DRAW_BUFFER0                                  = 0x8825;
+    const GLenum DRAW_BUFFER1                                  = 0x8826;
+    const GLenum DRAW_BUFFER2                                  = 0x8827;
+    const GLenum DRAW_BUFFER3                                  = 0x8828;
+    const GLenum DRAW_BUFFER4                                  = 0x8829;
+    const GLenum DRAW_BUFFER5                                  = 0x882A;
+    const GLenum DRAW_BUFFER6                                  = 0x882B;
+    const GLenum DRAW_BUFFER7                                  = 0x882C;
+    const GLenum DRAW_BUFFER8                                  = 0x882D;
+    const GLenum DRAW_BUFFER9                                  = 0x882E;
+    const GLenum DRAW_BUFFER10                                 = 0x882F;
+    const GLenum DRAW_BUFFER11                                 = 0x8830;
+    const GLenum DRAW_BUFFER12                                 = 0x8831;
+    const GLenum DRAW_BUFFER13                                 = 0x8832;
+    const GLenum DRAW_BUFFER14                                 = 0x8833;
+    const GLenum DRAW_BUFFER15                                 = 0x8834;
+    const GLenum MAX_FRAGMENT_UNIFORM_COMPONENTS               = 0x8B49;
+    const GLenum MAX_VERTEX_UNIFORM_COMPONENTS                 = 0x8B4A;
+    const GLenum SAMPLER_3D                                    = 0x8B5F;
+    const GLenum SAMPLER_2D_SHADOW                             = 0x8B62;
+    const GLenum FRAGMENT_SHADER_DERIVATIVE_HINT               = 0x8B8B;
+    const GLenum PIXEL_PACK_BUFFER                             = 0x88EB;
+    const GLenum PIXEL_UNPACK_BUFFER                           = 0x88EC;
+    const GLenum PIXEL_PACK_BUFFER_BINDING                     = 0x88ED;
+    const GLenum PIXEL_UNPACK_BUFFER_BINDING                   = 0x88EF;
+    const GLenum FLOAT_MAT2x3                                  = 0x8B65;
+    const GLenum FLOAT_MAT2x4                                  = 0x8B66;
+    const GLenum FLOAT_MAT3x2                                  = 0x8B67;
+    const GLenum FLOAT_MAT3x4                                  = 0x8B68;
+    const GLenum FLOAT_MAT4x2                                  = 0x8B69;
+    const GLenum FLOAT_MAT4x3                                  = 0x8B6A;
+    const GLenum SRGB                                          = 0x8C40;
+    const GLenum SRGB8                                         = 0x8C41;
+    const GLenum SRGB8_ALPHA8                                  = 0x8C43;
+    const GLenum COMPARE_REF_TO_TEXTURE                        = 0x884E;
+    const GLenum RGBA32F                                       = 0x8814;
+    const GLenum RGB32F                                        = 0x8815;
+    const GLenum RGBA16F                                       = 0x881A;
+    const GLenum RGB16F                                        = 0x881B;
+    const GLenum VERTEX_ATTRIB_ARRAY_INTEGER                   = 0x88FD;
+    const GLenum MAX_ARRAY_TEXTURE_LAYERS                      = 0x88FF;
+    const GLenum MIN_PROGRAM_TEXEL_OFFSET                      = 0x8904;
+    const GLenum MAX_PROGRAM_TEXEL_OFFSET                      = 0x8905;
+    const GLenum MAX_VARYING_COMPONENTS                        = 0x8B4B;
+    const GLenum TEXTURE_2D_ARRAY                              = 0x8C1A;
+    const GLenum TEXTURE_BINDING_2D_ARRAY                      = 0x8C1D;
+    const GLenum R11F_G11F_B10F                                = 0x8C3A;
+    const GLenum UNSIGNED_INT_10F_11F_11F_REV                  = 0x8C3B;
+    const GLenum RGB9_E5                                       = 0x8C3D;
+    const GLenum UNSIGNED_INT_5_9_9_9_REV                      = 0x8C3E;
+    const GLenum TRANSFORM_FEEDBACK_BUFFER_MODE                = 0x8C7F;
+    const GLenum MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS    = 0x8C80;
+    const GLenum TRANSFORM_FEEDBACK_VARYINGS                   = 0x8C83;
+    const GLenum TRANSFORM_FEEDBACK_BUFFER_START               = 0x8C84;
+    const GLenum TRANSFORM_FEEDBACK_BUFFER_SIZE                = 0x8C85;
+    const GLenum TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN         = 0x8C88;
+    const GLenum RASTERIZER_DISCARD                            = 0x8C89;
+    const GLenum MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS = 0x8C8A;
+    const GLenum MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS       = 0x8C8B;
+    const GLenum INTERLEAVED_ATTRIBS                           = 0x8C8C;
+    const GLenum SEPARATE_ATTRIBS                              = 0x8C8D;
+    const GLenum TRANSFORM_FEEDBACK_BUFFER                     = 0x8C8E;
+    const GLenum TRANSFORM_FEEDBACK_BUFFER_BINDING             = 0x8C8F;
+    const GLenum RGBA32UI                                      = 0x8D70;
+    const GLenum RGB32UI                                       = 0x8D71;
+    const GLenum RGBA16UI                                      = 0x8D76;
+    const GLenum RGB16UI                                       = 0x8D77;
+    const GLenum RGBA8UI                                       = 0x8D7C;
+    const GLenum RGB8UI                                        = 0x8D7D;
+    const GLenum RGBA32I                                       = 0x8D82;
+    const GLenum RGB32I                                        = 0x8D83;
+    const GLenum RGBA16I                                       = 0x8D88;
+    const GLenum RGB16I                                        = 0x8D89;
+    const GLenum RGBA8I                                        = 0x8D8E;
+    const GLenum RGB8I                                         = 0x8D8F;
+    const GLenum RED_INTEGER                                   = 0x8D94;
+    const GLenum RGB_INTEGER                                   = 0x8D98;
+    const GLenum RGBA_INTEGER                                  = 0x8D99;
+    const GLenum SAMPLER_2D_ARRAY                              = 0x8DC1;
+    const GLenum SAMPLER_2D_ARRAY_SHADOW                       = 0x8DC4;
+    const GLenum SAMPLER_CUBE_SHADOW                           = 0x8DC5;
+    const GLenum UNSIGNED_INT_VEC2                             = 0x8DC6;
+    const GLenum UNSIGNED_INT_VEC3                             = 0x8DC7;
+    const GLenum UNSIGNED_INT_VEC4                             = 0x8DC8;
+    const GLenum INT_SAMPLER_2D                                = 0x8DCA;
+    const GLenum INT_SAMPLER_3D                                = 0x8DCB;
+    const GLenum INT_SAMPLER_CUBE                              = 0x8DCC;
+    const GLenum INT_SAMPLER_2D_ARRAY                          = 0x8DCF;
+    const GLenum UNSIGNED_INT_SAMPLER_2D                       = 0x8DD2;
+    const GLenum UNSIGNED_INT_SAMPLER_3D                       = 0x8DD3;
+    const GLenum UNSIGNED_INT_SAMPLER_CUBE                     = 0x8DD4;
+    const GLenum UNSIGNED_INT_SAMPLER_2D_ARRAY                 = 0x8DD7;
+    const GLenum DEPTH_COMPONENT32F                            = 0x8CAC;
+    const GLenum DEPTH32F_STENCIL8                             = 0x8CAD;
+    const GLenum FLOAT_32_UNSIGNED_INT_24_8_REV                = 0x8DAD;
+    const GLenum FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING         = 0x8210;
+    const GLenum FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE         = 0x8211;
+    const GLenum FRAMEBUFFER_ATTACHMENT_RED_SIZE               = 0x8212;
+    const GLenum FRAMEBUFFER_ATTACHMENT_GREEN_SIZE             = 0x8213;
+    const GLenum FRAMEBUFFER_ATTACHMENT_BLUE_SIZE              = 0x8214;
+    const GLenum FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE             = 0x8215;
+    const GLenum FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE             = 0x8216;
+    const GLenum FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE           = 0x8217;
+    const GLenum FRAMEBUFFER_DEFAULT                           = 0x8218;
+    const GLenum UNSIGNED_INT_24_8                             = 0x84FA;
+    const GLenum DEPTH24_STENCIL8                              = 0x88F0;
+    const GLenum UNSIGNED_NORMALIZED                           = 0x8C17;
+    const GLenum DRAW_FRAMEBUFFER_BINDING                      = 0x8CA6; /* Same as FRAMEBUFFER_BINDING */
+    const GLenum READ_FRAMEBUFFER                              = 0x8CA8;
+    const GLenum DRAW_FRAMEBUFFER                              = 0x8CA9;
+    const GLenum READ_FRAMEBUFFER_BINDING                      = 0x8CAA;
+    const GLenum RENDERBUFFER_SAMPLES                          = 0x8CAB;
+    const GLenum FRAMEBUFFER_ATTACHMENT_TEXTURE_LAYER          = 0x8CD4;
+    const GLenum MAX_COLOR_ATTACHMENTS                         = 0x8CDF;
+    const GLenum COLOR_ATTACHMENT1                             = 0x8CE1;
+    const GLenum COLOR_ATTACHMENT2                             = 0x8CE2;
+    const GLenum COLOR_ATTACHMENT3                             = 0x8CE3;
+    const GLenum COLOR_ATTACHMENT4                             = 0x8CE4;
+    const GLenum COLOR_ATTACHMENT5                             = 0x8CE5;
+    const GLenum COLOR_ATTACHMENT6                             = 0x8CE6;
+    const GLenum COLOR_ATTACHMENT7                             = 0x8CE7;
+    const GLenum COLOR_ATTACHMENT8                             = 0x8CE8;
+    const GLenum COLOR_ATTACHMENT9                             = 0x8CE9;
+    const GLenum COLOR_ATTACHMENT10                            = 0x8CEA;
+    const GLenum COLOR_ATTACHMENT11                            = 0x8CEB;
+    const GLenum COLOR_ATTACHMENT12                            = 0x8CEC;
+    const GLenum COLOR_ATTACHMENT13                            = 0x8CED;
+    const GLenum COLOR_ATTACHMENT14                            = 0x8CEE;
+    const GLenum COLOR_ATTACHMENT15                            = 0x8CEF;
+    const GLenum FRAMEBUFFER_INCOMPLETE_MULTISAMPLE            = 0x8D56;
+    const GLenum MAX_SAMPLES                                   = 0x8D57;
+    const GLenum HALF_FLOAT                                    = 0x140B;
+    const GLenum RG                                            = 0x8227;
+    const GLenum RG_INTEGER                                    = 0x8228;
+    const GLenum R8                                            = 0x8229;
+    const GLenum RG8                                           = 0x822B;
+    const GLenum R16F                                          = 0x822D;
+    const GLenum R32F                                          = 0x822E;
+    const GLenum RG16F                                         = 0x822F;
+    const GLenum RG32F                                         = 0x8230;
+    const GLenum R8I                                           = 0x8231;
+    const GLenum R8UI                                          = 0x8232;
+    const GLenum R16I                                          = 0x8233;
+    const GLenum R16UI                                         = 0x8234;
+    const GLenum R32I                                          = 0x8235;
+    const GLenum R32UI                                         = 0x8236;
+    const GLenum RG8I                                          = 0x8237;
+    const GLenum RG8UI                                         = 0x8238;
+    const GLenum RG16I                                         = 0x8239;
+    const GLenum RG16UI                                        = 0x823A;
+    const GLenum RG32I                                         = 0x823B;
+    const GLenum RG32UI                                        = 0x823C;
+    const GLenum VERTEX_ARRAY_BINDING                          = 0x85B5;
+    const GLenum R8_SNORM                                      = 0x8F94;
+    const GLenum RG8_SNORM                                     = 0x8F95;
+    const GLenum RGB8_SNORM                                    = 0x8F96;
+    const GLenum RGBA8_SNORM                                   = 0x8F97;
+    const GLenum SIGNED_NORMALIZED                             = 0x8F9C;
+    const GLenum COPY_READ_BUFFER                              = 0x8F36;
+    const GLenum COPY_WRITE_BUFFER                             = 0x8F37;
+    const GLenum COPY_READ_BUFFER_BINDING                      = 0x8F36; /* Same as COPY_READ_BUFFER */
+    const GLenum COPY_WRITE_BUFFER_BINDING                     = 0x8F37; /* Same as COPY_WRITE_BUFFER */
+    const GLenum UNIFORM_BUFFER                                = 0x8A11;
+    const GLenum UNIFORM_BUFFER_BINDING                        = 0x8A28;
+    const GLenum UNIFORM_BUFFER_START                          = 0x8A29;
+    const GLenum UNIFORM_BUFFER_SIZE                           = 0x8A2A;
+    const GLenum MAX_VERTEX_UNIFORM_BLOCKS                     = 0x8A2B;
+    const GLenum MAX_FRAGMENT_UNIFORM_BLOCKS                   = 0x8A2D;
+    const GLenum MAX_COMBINED_UNIFORM_BLOCKS                   = 0x8A2E;
+    const GLenum MAX_UNIFORM_BUFFER_BINDINGS                   = 0x8A2F;
+    const GLenum MAX_UNIFORM_BLOCK_SIZE                        = 0x8A30;
+    const GLenum MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS        = 0x8A31;
+    const GLenum MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS      = 0x8A33;
+    const GLenum UNIFORM_BUFFER_OFFSET_ALIGNMENT               = 0x8A34;
+    const GLenum ACTIVE_UNIFORM_BLOCKS                         = 0x8A36;
+    const GLenum UNIFORM_TYPE                                  = 0x8A37;
+    const GLenum UNIFORM_SIZE                                  = 0x8A38;
+    const GLenum UNIFORM_BLOCK_INDEX                           = 0x8A3A;
+    const GLenum UNIFORM_OFFSET                                = 0x8A3B;
+    const GLenum UNIFORM_ARRAY_STRIDE                          = 0x8A3C;
+    const GLenum UNIFORM_MATRIX_STRIDE                         = 0x8A3D;
+    const GLenum UNIFORM_IS_ROW_MAJOR                          = 0x8A3E;
+    const GLenum UNIFORM_BLOCK_BINDING                         = 0x8A3F;
+    const GLenum UNIFORM_BLOCK_DATA_SIZE                       = 0x8A40;
+    const GLenum UNIFORM_BLOCK_ACTIVE_UNIFORMS                 = 0x8A42;
+    const GLenum UNIFORM_BLOCK_ACTIVE_UNIFORM_INDICES          = 0x8A43;
+    const GLenum UNIFORM_BLOCK_REFERENCED_BY_VERTEX_SHADER     = 0x8A44;
+    const GLenum UNIFORM_BLOCK_REFERENCED_BY_FRAGMENT_SHADER   = 0x8A46;
+    const GLenum INVALID_INDEX                                 = 0xFFFFFFFF;
+    const GLenum MAX_VERTEX_OUTPUT_COMPONENTS                  = 0x9122;
+    const GLenum MAX_FRAGMENT_INPUT_COMPONENTS                 = 0x9125;
+    const GLenum MAX_SERVER_WAIT_TIMEOUT                       = 0x9111;
+    const GLenum OBJECT_TYPE                                   = 0x9112;
+    const GLenum SYNC_CONDITION                                = 0x9113;
+    const GLenum SYNC_STATUS                                   = 0x9114;
+    const GLenum SYNC_FLAGS                                    = 0x9115;
+    const GLenum SYNC_FENCE                                    = 0x9116;
+    const GLenum SYNC_GPU_COMMANDS_COMPLETE                    = 0x9117;
+    const GLenum UNSIGNALED                                    = 0x9118;
+    const GLenum SIGNALED                                      = 0x9119;
+    const GLenum ALREADY_SIGNALED                              = 0x911A;
+    const GLenum TIMEOUT_EXPIRED                               = 0x911B;
+    const GLenum CONDITION_SATISFIED                           = 0x911C;
+    [NeedsWindowsUndef]
+    const GLenum WAIT_FAILED                                   = 0x911D;
+    const GLenum SYNC_FLUSH_COMMANDS_BIT                       = 0x00000001;
+    const GLenum VERTEX_ATTRIB_ARRAY_DIVISOR                   = 0x88FE;
+    const GLenum ANY_SAMPLES_PASSED                            = 0x8C2F;
+    const GLenum ANY_SAMPLES_PASSED_CONSERVATIVE               = 0x8D6A;
+    const GLenum SAMPLER_BINDING                               = 0x8919;
+    const GLenum RGB10_A2UI                                    = 0x906F;
+    const GLenum INT_2_10_10_10_REV                            = 0x8D9F;
+    const GLenum TRANSFORM_FEEDBACK                            = 0x8E22;
+    const GLenum TRANSFORM_FEEDBACK_PAUSED                     = 0x8E23;
+    const GLenum TRANSFORM_FEEDBACK_ACTIVE                     = 0x8E24;
+    const GLenum TRANSFORM_FEEDBACK_BINDING                    = 0x8E25;
+    const GLenum TEXTURE_IMMUTABLE_FORMAT                      = 0x912F;
+    const GLenum MAX_ELEMENT_INDEX                             = 0x8D6B;
+    const GLenum TEXTURE_IMMUTABLE_LEVELS                      = 0x82DF;
+
+    const GLint64 TIMEOUT_IGNORED                              = -1;
+
+    /* WebGL-specific enums */
+    const GLenum MAX_CLIENT_WAIT_TIMEOUT_WEBGL                 = 0x9247;
+
+    /* Buffer objects */
+    // WebGL1:
+    void bufferData(GLenum target, GLsizeiptr size, GLenum usage);
+    void bufferData(GLenum target, ArrayBuffer? srcData, GLenum usage);
+    void bufferData(GLenum target, ArrayBufferView srcData, GLenum usage);
+    void bufferSubData(GLenum target, GLintptr offset, ArrayBuffer srcData);
+    void bufferSubData(GLenum target, GLintptr offset, ArrayBufferView srcData);
+    // WebGL2:
+    void bufferData(GLenum target, ArrayBufferView srcData, GLenum usage,
+                    GLuint srcOffset, optional GLuint length = 0);
+    void bufferSubData(GLenum target, GLintptr dstByteOffset, ArrayBufferView srcData,
+                       GLuint srcOffset, optional GLuint length = 0);
+
+    void copyBufferSubData(GLenum readTarget, GLenum writeTarget, GLintptr readOffset,
+                           GLintptr writeOffset, GLsizeiptr size);
+    // MapBufferRange, in particular its read-only and write-only modes,
+    // can not be exposed safely to JavaScript. GetBufferSubData
+    // replaces it for the purpose of fetching data back from the GPU.
+    void getBufferSubData(GLenum target, GLintptr srcByteOffset, ArrayBufferView dstData,
+                          optional GLuint dstOffset = 0, optional GLuint length = 0);
+
+    /* Framebuffer objects */
+    void blitFramebuffer(GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1, GLint dstX0, GLint dstY0,
+                         GLint dstX1, GLint dstY1, GLbitfield mask, GLenum filter);
+    void framebufferTextureLayer(GLenum target, GLenum attachment, WebGLTexture? texture, GLint level,
+                                 GLint layer);
+
+    [Throws]
+    void invalidateFramebuffer(GLenum target, sequence<GLenum> attachments);
+
+    [Throws]
+    void invalidateSubFramebuffer(GLenum target, sequence<GLenum> attachments,
+                                  GLint x, GLint y, GLsizei width, GLsizei height);
+
+    void readBuffer(GLenum src);
+
+    /* Renderbuffer objects */
+    [Throws]
+    any getInternalformatParameter(GLenum target, GLenum internalformat, GLenum pname);
+    void renderbufferStorageMultisample(GLenum target, GLsizei samples, GLenum internalformat,
+                                        GLsizei width, GLsizei height);
+
+    /* Texture objects */
+    void texStorage2D(GLenum target, GLsizei levels, GLenum internalformat, GLsizei width,
+                      GLsizei height);
+    void texStorage3D(GLenum target, GLsizei levels, GLenum internalformat, GLsizei width,
+                      GLsizei height, GLsizei depth);
+
+    // WebGL1 legacy entrypoints:
+    [Throws] // Another overhead throws.
+    void texImage2D(GLenum target, GLint level, GLint internalformat,
+                    GLsizei width, GLsizei height, GLint border, GLenum format,
+                    GLenum type, ArrayBufferView? pixels);
+    [Throws]
+    void texImage2D(GLenum target, GLint level, GLint internalformat,
+                    GLenum format, GLenum type, HTMLCanvasElement source); // May throw DOMException
+    [Throws]
+    void texImage2D(GLenum target, GLint level, GLint internalformat,
+                    GLenum format, GLenum type, HTMLImageElement source); // May throw DOMException
+    [Throws]
+    void texImage2D(GLenum target, GLint level, GLint internalformat,
+                    GLenum format, GLenum type, HTMLVideoElement source); // May throw DOMException
+    [Throws] // Another overhead throws.
+    void texImage2D(GLenum target, GLint level, GLint internalformat,
+                    GLenum format, GLenum type, ImageBitmap source);
+    [Throws] // Another overhead throws.
+    void texImage2D(GLenum target, GLint level, GLint internalformat,
+                    GLenum format, GLenum type, ImageData source);
+
+    [Throws] // Another overhead throws.
+    void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                       GLsizei width, GLsizei height,
+                       GLenum format, GLenum type, ArrayBufferView? pixels);
+    [Throws]
+    void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                       GLenum format, GLenum type, HTMLCanvasElement source); // May throw DOMException
+    [Throws]
+    void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                       GLenum format, GLenum type, HTMLImageElement source); // May throw DOMException
+    [Throws]
+    void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                       GLenum format, GLenum type, HTMLVideoElement source); // May throw DOMException
+    [Throws] // Another overhead throws.
+    void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                       GLenum format, GLenum type, ImageBitmap source);
+    [Throws] // Another overhead throws.
+    void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                       GLenum format, GLenum type, ImageData source);
+
+    // WebGL2 entrypoints:
+    [Throws] // Another overhead throws.
+    void texImage2D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                    GLint border, GLenum format, GLenum type, GLintptr pboOffset);
+    [Throws]
+    void texImage2D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                    GLint border, GLenum format, GLenum type,
+                    HTMLCanvasElement source); // May throw DOMException
+    [Throws]
+    void texImage2D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                    GLint border, GLenum format, GLenum type,
+                    HTMLImageElement source); // May throw DOMException
+    [Throws]
+    void texImage2D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                    GLint border, GLenum format, GLenum type,
+                    HTMLVideoElement source); // May throw DOMException
+    [Throws] // Another overhead throws.
+    void texImage2D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                    GLint border, GLenum format, GLenum type,
+                    ImageBitmap source);
+    [Throws] // Another overhead throws.
+    void texImage2D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                    GLint border, GLenum format, GLenum type,
+                    ImageData source);
+    [Throws] // Another overhead throws.
+    void texImage2D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                    GLint border, GLenum format, GLenum type, ArrayBufferView srcData,
+                    GLuint srcOffset);
+
+    [Throws] // Another overhead throws.
+    void texImage3D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                    GLsizei depth, GLint border, GLenum format, GLenum type, GLintptr pboOffset);
+    [Throws]
+    void texImage3D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                    GLsizei depth, GLint border, GLenum format, GLenum type,
+                    HTMLCanvasElement source); // May throw DOMException
+    [Throws]
+    void texImage3D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                    GLsizei depth, GLint border, GLenum format, GLenum type,
+                    HTMLImageElement source); // May throw DOMException
+    [Throws]
+    void texImage3D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                    GLsizei depth, GLint border, GLenum format, GLenum type,
+                    HTMLVideoElement source); // May throw DOMException
+    [Throws] // Another overhead throws.
+    void texImage3D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                    GLsizei depth, GLint border, GLenum format, GLenum type,
+                    ImageBitmap source);
+    [Throws] // Another overhead throws.
+    void texImage3D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                    GLsizei depth, GLint border, GLenum format, GLenum type,
+                    ImageData source);
+    [Throws] // Another overhead throws.
+    void texImage3D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                    GLsizei depth, GLint border, GLenum format, GLenum type, ArrayBufferView? srcData);
+    [Throws] // Another overhead throws.
+    void texImage3D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                    GLsizei depth, GLint border, GLenum format, GLenum type, ArrayBufferView srcData,
+                    GLuint srcOffset);
+
+    [Throws] // Another overhead throws.
+    void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width,
+                       GLsizei height, GLenum format, GLenum type, GLintptr pboOffset);
+    [Throws]
+    void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width,
+                       GLsizei height, GLenum format, GLenum type,
+                       HTMLCanvasElement source); // May throw DOMException
+    [Throws]
+    void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width,
+                       GLsizei height, GLenum format, GLenum type,
+                       HTMLImageElement source); // May throw DOMException
+    [Throws]
+    void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width,
+                       GLsizei height, GLenum format, GLenum type,
+                       HTMLVideoElement source); // May throw DOMException
+    [Throws] // Another overhead throws.
+    void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width,
+                       GLsizei height, GLenum format, GLenum type,
+                       ImageBitmap source);
+    [Throws] // Another overhead throws.
+    void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width,
+                       GLsizei height, GLenum format, GLenum type,
+                       ImageData source);
+    [Throws] // Another overhead throws.
+    void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width,
+                       GLsizei height, GLenum format, GLenum type, ArrayBufferView srcData,
+                       GLuint srcOffset);
+
+    [Throws] // Another overhead throws.
+    void texSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset,
+                       GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type,
+                       GLintptr pboOffset);
+    [Throws]
+    void texSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset,
+                       GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type,
+                       HTMLCanvasElement source); // May throw DOMException
+    [Throws]
+    void texSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset,
+                       GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type,
+                       HTMLImageElement source); // May throw DOMException
+    [Throws]
+    void texSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset,
+                       GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type,
+                       HTMLVideoElement source); // May throw DOMException
+    [Throws] // Another overhead throws.
+    void texSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset,
+                       GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type,
+                       ImageBitmap source);
+    [Throws] // Another overhead throws.
+    void texSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset,
+                       GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type,
+                       ImageData source);
+    [Throws] // Another overhead throws.
+    void texSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset,
+                       GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type,
+                       ArrayBufferView? srcData, optional GLuint srcOffset = 0);
+
+    void copyTexSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset,
+                           GLint x, GLint y, GLsizei width, GLsizei height);
+
+    void compressedTexImage2D(GLenum target, GLint level, GLenum internalformat, GLsizei width,
+                              GLsizei height, GLint border, GLsizei imageSize,  GLintptr offset);
+    void compressedTexImage2D(GLenum target, GLint level, GLenum internalformat, GLsizei width,
+                              GLsizei height, GLint border, ArrayBufferView srcData,
+                              optional GLuint srcOffset = 0, optional GLuint srcLengthOverride = 0);
+
+    void compressedTexImage3D(GLenum target, GLint level, GLenum internalformat, GLsizei width,
+                              GLsizei height, GLsizei depth, GLint border, GLsizei imageSize, GLintptr offset);
+    void compressedTexImage3D(GLenum target, GLint level, GLenum internalformat, GLsizei width,
+                              GLsizei height, GLsizei depth, GLint border, ArrayBufferView srcData,
+                              optional GLuint srcOffset = 0, optional GLuint srcLengthOverride = 0);
+
+    void compressedTexSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                                 GLsizei width, GLsizei height, GLenum format, GLsizei imageSize, GLintptr offset);
+    void compressedTexSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                                 GLsizei width, GLsizei height, GLenum format,
+                                 ArrayBufferView srcData,
+                                 optional GLuint srcOffset = 0,
+                                 optional GLuint srcLengthOverride = 0);
+
+    void compressedTexSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                                 GLint zoffset, GLsizei width, GLsizei height, GLsizei depth,
+                                 GLenum format, GLsizei imageSize, GLintptr offset);
+    void compressedTexSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                                 GLint zoffset, GLsizei width, GLsizei height, GLsizei depth,
+                                 GLenum format, ArrayBufferView srcData,
+                                 optional GLuint srcOffset = 0,
+                                 optional GLuint srcLengthOverride = 0);
+
+    /* Programs and shaders */
+    [WebGLHandlesContextLoss] GLint getFragDataLocation(WebGLProgram program, DOMString name);
+
+    /* Uniforms */
+    void uniform1ui(WebGLUniformLocation? location, GLuint v0);
+    void uniform2ui(WebGLUniformLocation? location, GLuint v0, GLuint v1);
+    void uniform3ui(WebGLUniformLocation? location, GLuint v0, GLuint v1, GLuint v2);
+    void uniform4ui(WebGLUniformLocation? location, GLuint v0, GLuint v1, GLuint v2, GLuint v3);
+
+    void uniform1fv(WebGLUniformLocation? location, Float32List data, optional GLuint srcOffset = 0,
+                    optional GLuint srcLength = 0);
+    void uniform2fv(WebGLUniformLocation? location, Float32List data, optional GLuint srcOffset = 0,
+                    optional GLuint srcLength = 0);
+    void uniform3fv(WebGLUniformLocation? location, Float32List data, optional GLuint srcOffset = 0,
+                    optional GLuint srcLength = 0);
+    void uniform4fv(WebGLUniformLocation? location, Float32List data, optional GLuint srcOffset = 0,
+                    optional GLuint srcLength = 0);
+
+    void uniform1iv(WebGLUniformLocation? location, Int32List data, optional GLuint srcOffset = 0,
+                    optional GLuint srcLength = 0);
+    void uniform2iv(WebGLUniformLocation? location, Int32List data, optional GLuint srcOffset = 0,
+                    optional GLuint srcLength = 0);
+    void uniform3iv(WebGLUniformLocation? location, Int32List data, optional GLuint srcOffset = 0,
+                    optional GLuint srcLength = 0);
+    void uniform4iv(WebGLUniformLocation? location, Int32List data, optional GLuint srcOffset = 0,
+                    optional GLuint srcLength = 0);
+
+    void uniform1uiv(WebGLUniformLocation? location, Uint32List data, optional GLuint srcOffset = 0,
+                    optional GLuint srcLength = 0);
+    void uniform2uiv(WebGLUniformLocation? location, Uint32List data, optional GLuint srcOffset = 0,
+                    optional GLuint srcLength = 0);
+    void uniform3uiv(WebGLUniformLocation? location, Uint32List data, optional GLuint srcOffset = 0,
+                    optional GLuint srcLength = 0);
+    void uniform4uiv(WebGLUniformLocation? location, Uint32List data, optional GLuint srcOffset = 0,
+                    optional GLuint srcLength = 0);
+
+    void uniformMatrix2fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
+                          optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+    void uniformMatrix3x2fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
+                            optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+    void uniformMatrix4x2fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
+                            optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+
+    void uniformMatrix2x3fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
+                            optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+    void uniformMatrix3fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
+                          optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+    void uniformMatrix4x3fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
+                            optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+
+    void uniformMatrix2x4fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
+                            optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+    void uniformMatrix3x4fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
+                            optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+    void uniformMatrix4fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
+                          optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+
+    /* Vertex attribs */
+    void vertexAttribI4i(GLuint index, GLint x, GLint y, GLint z, GLint w);
+    void vertexAttribI4iv(GLuint index, Int32List values);
+    void vertexAttribI4ui(GLuint index, GLuint x, GLuint y, GLuint z, GLuint w);
+    void vertexAttribI4uiv(GLuint index, Uint32List values);
+    void vertexAttribIPointer(GLuint index, GLint size, GLenum type, GLsizei stride, GLintptr offset);
+
+    /* Writing to the drawing buffer */
+    void vertexAttribDivisor(GLuint index, GLuint divisor);
+    void drawArraysInstanced(GLenum mode, GLint first, GLsizei count, GLsizei instanceCount);
+    void drawElementsInstanced(GLenum mode, GLsizei count, GLenum type, GLintptr offset, GLsizei instanceCount);
+    void drawRangeElements(GLenum mode, GLuint start, GLuint end, GLsizei count, GLenum type, GLintptr offset);
+
+    /* Reading back pixels */
+    // WebGL1:
+    [Throws, NeedsCallerType] // Throws on readback in a write-only context.
+    void readPixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type,
+                    ArrayBufferView? dstData);
+    // WebGL2:
+    [Throws, NeedsCallerType] // Throws on readback in a write-only context.
+    void readPixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type,
+                    GLintptr offset);
+    [Throws, NeedsCallerType] // Throws on readback in a write-only context.
+    void readPixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type,
+                    ArrayBufferView dstData, GLuint dstOffset);
+
+    /* Multiple Render Targets */
+    void drawBuffers(sequence<GLenum> buffers);
+
+    void clearBufferfv(GLenum buffer, GLint drawbuffer, Float32List values,
+                       optional GLuint srcOffset = 0);
+    void clearBufferiv(GLenum buffer, GLint drawbuffer, Int32List values,
+                       optional GLuint srcOffset = 0);
+    void clearBufferuiv(GLenum buffer, GLint drawbuffer, Uint32List values,
+                        optional GLuint srcOffset = 0);
+
+    void clearBufferfi(GLenum buffer, GLint drawbuffer, GLfloat depth, GLint stencil);
+
+    /* Query Objects */
+    WebGLQuery? createQuery();
+    void deleteQuery(WebGLQuery? query);
+    [WebGLHandlesContextLoss] GLboolean isQuery(WebGLQuery? query);
+    void beginQuery(GLenum target, WebGLQuery query);
+    void endQuery(GLenum target);
+    any getQuery(GLenum target, GLenum pname);
+    any getQueryParameter(WebGLQuery query, GLenum pname);
+
+    /* Sampler Objects */
+    WebGLSampler? createSampler();
+    void deleteSampler(WebGLSampler? sampler);
+    [WebGLHandlesContextLoss] GLboolean isSampler(WebGLSampler? sampler);
+    void bindSampler(GLuint unit, WebGLSampler? sampler);
+    void samplerParameteri(WebGLSampler sampler, GLenum pname, GLint param);
+    void samplerParameterf(WebGLSampler sampler, GLenum pname, GLfloat param);
+    any getSamplerParameter(WebGLSampler sampler, GLenum pname);
+
+    /* Sync objects */
+    WebGLSync? fenceSync(GLenum condition, GLbitfield flags);
+    [WebGLHandlesContextLoss] GLboolean isSync(WebGLSync? sync);
+    void deleteSync(WebGLSync? sync);
+    GLenum clientWaitSync(WebGLSync sync, GLbitfield flags, GLuint64 timeout);
+    void waitSync(WebGLSync sync, GLbitfield flags, GLint64 timeout);
+    any getSyncParameter(WebGLSync sync, GLenum pname);
+
+    /* Transform Feedback */
+    WebGLTransformFeedback? createTransformFeedback();
+    void deleteTransformFeedback(WebGLTransformFeedback? tf);
+    [WebGLHandlesContextLoss] GLboolean isTransformFeedback(WebGLTransformFeedback? tf);
+    void bindTransformFeedback(GLenum target, WebGLTransformFeedback? tf);
+    void beginTransformFeedback(GLenum primitiveMode);
+    void endTransformFeedback();
+    void transformFeedbackVaryings(WebGLProgram program, sequence<DOMString> varyings, GLenum bufferMode);
+    [NewObject]
+    WebGLActiveInfo? getTransformFeedbackVarying(WebGLProgram program, GLuint index);
+    void pauseTransformFeedback();
+    void resumeTransformFeedback();
+
+    /* Uniform Buffer Objects and Transform Feedback Buffers */
+    void bindBufferBase(GLenum target, GLuint index, WebGLBuffer? buffer);
+    void bindBufferRange(GLenum target, GLuint index, WebGLBuffer? buffer, GLintptr offset, GLsizeiptr size);
+    [Throws] // GetOrCreateDOMReflector can fail.
+    any getIndexedParameter(GLenum target, GLuint index);
+    sequence<GLuint>? getUniformIndices(WebGLProgram program, sequence<DOMString> uniformNames);
+    any getActiveUniforms(WebGLProgram program, sequence<GLuint> uniformIndices, GLenum pname);
+    GLuint getUniformBlockIndex(WebGLProgram program, DOMString uniformBlockName);
+    [Throws] // Creating a Uint32Array can fail.
+    any getActiveUniformBlockParameter(WebGLProgram program, GLuint uniformBlockIndex, GLenum pname);
+    DOMString? getActiveUniformBlockName(WebGLProgram program, GLuint uniformBlockIndex);
+    void uniformBlockBinding(WebGLProgram program, GLuint uniformBlockIndex, GLuint uniformBlockBinding);
+
+    /* Vertex Array Objects */
+    WebGLVertexArrayObject? createVertexArray();
+    void deleteVertexArray(WebGLVertexArrayObject? vertexArray);
+    [WebGLHandlesContextLoss] GLboolean isVertexArray(WebGLVertexArrayObject? vertexArray);
+    void bindVertexArray(WebGLVertexArrayObject? array);
+};
+
+WebGL2RenderingContextBase implements WebGLRenderingContextBase;
+WebGL2RenderingContext implements WebGL2RenderingContextBase;
+
+[NoInterfaceObject]
+interface EXT_color_buffer_float {
+};
diff --git a/crates/web-sys/webidls/available/WebGLContextEvent.webidl b/crates/web-sys/webidls/available/WebGLContextEvent.webidl
new file mode 100644
index 00000000..8b227da7
--- /dev/null
+++ b/crates/web-sys/webidls/available/WebGLContextEvent.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+
+ * The origin of this IDL file is
+ * https://www.khronos.org/registry/webgl/specs/latest/1.0/#fire-a-webgl-context-event
+ */
+
+[Constructor(DOMString type, optional WebGLContextEventInit eventInit),
+ Exposed=(Window,Worker),
+ Func="mozilla::dom::OffscreenCanvas::PrefEnabledOnWorkerThread"]
+interface WebGLContextEvent : Event {
+  readonly attribute DOMString statusMessage;
+};
+
+// EventInit is defined in the DOM4 specification.
+dictionary WebGLContextEventInit : EventInit {
+  DOMString statusMessage = "";
+};
diff --git a/crates/web-sys/webidls/available/WebGLRenderingContext.webidl b/crates/web-sys/webidls/available/WebGLRenderingContext.webidl
new file mode 100644
index 00000000..ea6bb5c2
--- /dev/null
+++ b/crates/web-sys/webidls/available/WebGLRenderingContext.webidl
@@ -0,0 +1,1109 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://www.khronos.org/registry/webgl/specs/latest/webgl.idl
+ *
+ * Copyright © 2012 Khronos Group
+ */
+
+// WebGL IDL definitions scraped from the Khronos specification:
+// https://www.khronos.org/registry/webgl/specs/latest/
+//
+// This IDL depends on the typed array specification defined at:
+// https://www.khronos.org/registry/typedarray/specs/latest/typedarrays.idl
+
+typedef unsigned long  GLenum;
+typedef boolean        GLboolean;
+typedef unsigned long  GLbitfield;
+typedef byte           GLbyte;         /* 'byte' should be a signed 8 bit type. */
+typedef short          GLshort;
+typedef long           GLint;
+typedef long           GLsizei;
+typedef long long      GLintptr;
+typedef long long      GLsizeiptr;
+// Ideally the typedef below would use 'unsigned byte', but that doesn't currently exist in Web IDL.
+typedef octet          GLubyte;        /* 'octet' should be an unsigned 8 bit type. */
+typedef unsigned short GLushort;
+typedef unsigned long  GLuint;
+typedef unrestricted float GLfloat;
+typedef unrestricted float GLclampf;
+typedef unsigned long long GLuint64EXT;
+
+// The power preference settings are documented in the WebGLContextAttributes
+// section of the specification.
+enum WebGLPowerPreference { "default", "low-power", "high-performance" };
+
+dictionary WebGLContextAttributes {
+    // boolean alpha = true;
+    // We deviate from the spec here.
+    // If alpha isn't specified, we rely on a pref ("webgl.default-no-alpha")
+    GLboolean alpha;
+    GLboolean depth = true;
+    GLboolean stencil = false;
+    GLboolean antialias = true;
+    GLboolean premultipliedAlpha = true;
+    GLboolean preserveDrawingBuffer = false;
+    GLboolean failIfMajorPerformanceCaveat = false;
+    WebGLPowerPreference powerPreference = "default";
+};
+
+[Exposed=(Window,Worker),
+ Func="mozilla::dom::OffscreenCanvas::PrefEnabledOnWorkerThread"]
+interface WebGLBuffer {
+};
+
+[Exposed=(Window,Worker),
+ Func="mozilla::dom::OffscreenCanvas::PrefEnabledOnWorkerThread"]
+interface WebGLFramebuffer {
+};
+
+[Exposed=(Window,Worker),
+ Func="mozilla::dom::OffscreenCanvas::PrefEnabledOnWorkerThread"]
+interface WebGLProgram {
+};
+
+[Exposed=(Window,Worker),
+ Func="mozilla::dom::OffscreenCanvas::PrefEnabledOnWorkerThread"]
+interface WebGLRenderbuffer {
+};
+
+[Exposed=(Window,Worker),
+ Func="mozilla::dom::OffscreenCanvas::PrefEnabledOnWorkerThread"]
+interface WebGLShader {
+};
+
+[Exposed=(Window,Worker),
+ Func="mozilla::dom::OffscreenCanvas::PrefEnabledOnWorkerThread"]
+interface WebGLTexture {
+};
+
+[Exposed=(Window,Worker),
+ Func="mozilla::dom::OffscreenCanvas::PrefEnabledOnWorkerThread"]
+interface WebGLUniformLocation {
+};
+
+interface WebGLVertexArrayObject {
+};
+
+[Exposed=(Window,Worker),
+ Func="mozilla::dom::OffscreenCanvas::PrefEnabledOnWorkerThread"]
+interface WebGLActiveInfo {
+    readonly attribute GLint size;
+    readonly attribute GLenum type;
+    readonly attribute DOMString name;
+};
+
+[Exposed=(Window,Worker),
+ Func="mozilla::dom::OffscreenCanvas::PrefEnabledOnWorkerThread"]
+interface WebGLShaderPrecisionFormat {
+    readonly attribute GLint rangeMin;
+    readonly attribute GLint rangeMax;
+    readonly attribute GLint precision;
+};
+
+typedef (Float32Array or sequence<GLfloat>) Float32List;
+typedef (Int32Array or sequence<GLint>) Int32List;
+
+// Shared interface for the things that WebGLRenderingContext and
+// WebGL2RenderingContext have in common.  This doesn't have all the things they
+// have in common, because we don't support splitting multiple overloads of the
+// same method across separate interfaces and pulling them in with "implements".
+[Exposed=(Window, Worker), NoInterfaceObject]
+interface WebGLRenderingContextBase {
+    /* ClearBufferMask */
+    const GLenum DEPTH_BUFFER_BIT               = 0x00000100;
+    const GLenum STENCIL_BUFFER_BIT             = 0x00000400;
+    const GLenum COLOR_BUFFER_BIT               = 0x00004000;
+
+    /* BeginMode */
+    const GLenum POINTS                         = 0x0000;
+    const GLenum LINES                          = 0x0001;
+    const GLenum LINE_LOOP                      = 0x0002;
+    const GLenum LINE_STRIP                     = 0x0003;
+    const GLenum TRIANGLES                      = 0x0004;
+    const GLenum TRIANGLE_STRIP                 = 0x0005;
+    const GLenum TRIANGLE_FAN                   = 0x0006;
+
+    /* AlphaFunction (not supported in ES20) */
+    /*      NEVER */
+    /*      LESS */
+    /*      EQUAL */
+    /*      LEQUAL */
+    /*      GREATER */
+    /*      NOTEQUAL */
+    /*      GEQUAL */
+    /*      ALWAYS */
+
+    /* BlendingFactorDest */
+    const GLenum ZERO                           = 0;
+    const GLenum ONE                            = 1;
+    const GLenum SRC_COLOR                      = 0x0300;
+    const GLenum ONE_MINUS_SRC_COLOR            = 0x0301;
+    const GLenum SRC_ALPHA                      = 0x0302;
+    const GLenum ONE_MINUS_SRC_ALPHA            = 0x0303;
+    const GLenum DST_ALPHA                      = 0x0304;
+    const GLenum ONE_MINUS_DST_ALPHA            = 0x0305;
+
+    /* BlendingFactorSrc */
+    /*      ZERO */
+    /*      ONE */
+    const GLenum DST_COLOR                      = 0x0306;
+    const GLenum ONE_MINUS_DST_COLOR            = 0x0307;
+    const GLenum SRC_ALPHA_SATURATE             = 0x0308;
+    /*      SRC_ALPHA */
+    /*      ONE_MINUS_SRC_ALPHA */
+    /*      DST_ALPHA */
+    /*      ONE_MINUS_DST_ALPHA */
+
+    /* BlendEquationSeparate */
+    const GLenum FUNC_ADD                       = 0x8006;
+    const GLenum BLEND_EQUATION                 = 0x8009;
+    const GLenum BLEND_EQUATION_RGB             = 0x8009;   /* same as BLEND_EQUATION */
+    const GLenum BLEND_EQUATION_ALPHA           = 0x883D;
+
+    /* BlendSubtract */
+    const GLenum FUNC_SUBTRACT                  = 0x800A;
+    const GLenum FUNC_REVERSE_SUBTRACT          = 0x800B;
+
+    /* Separate Blend Functions */
+    const GLenum BLEND_DST_RGB                  = 0x80C8;
+    const GLenum BLEND_SRC_RGB                  = 0x80C9;
+    const GLenum BLEND_DST_ALPHA                = 0x80CA;
+    const GLenum BLEND_SRC_ALPHA                = 0x80CB;
+    const GLenum CONSTANT_COLOR                 = 0x8001;
+    const GLenum ONE_MINUS_CONSTANT_COLOR       = 0x8002;
+    const GLenum CONSTANT_ALPHA                 = 0x8003;
+    const GLenum ONE_MINUS_CONSTANT_ALPHA       = 0x8004;
+    const GLenum BLEND_COLOR                    = 0x8005;
+
+    /* Buffer Objects */
+    const GLenum ARRAY_BUFFER                   = 0x8892;
+    const GLenum ELEMENT_ARRAY_BUFFER           = 0x8893;
+    const GLenum ARRAY_BUFFER_BINDING           = 0x8894;
+    const GLenum ELEMENT_ARRAY_BUFFER_BINDING   = 0x8895;
+
+    const GLenum STREAM_DRAW                    = 0x88E0;
+    const GLenum STATIC_DRAW                    = 0x88E4;
+    const GLenum DYNAMIC_DRAW                   = 0x88E8;
+
+    const GLenum BUFFER_SIZE                    = 0x8764;
+    const GLenum BUFFER_USAGE                   = 0x8765;
+
+    const GLenum CURRENT_VERTEX_ATTRIB          = 0x8626;
+
+    /* CullFaceMode */
+    const GLenum FRONT                          = 0x0404;
+    const GLenum BACK                           = 0x0405;
+    const GLenum FRONT_AND_BACK                 = 0x0408;
+
+    /* DepthFunction */
+    /*      NEVER */
+    /*      LESS */
+    /*      EQUAL */
+    /*      LEQUAL */
+    /*      GREATER */
+    /*      NOTEQUAL */
+    /*      GEQUAL */
+    /*      ALWAYS */
+
+    /* EnableCap */
+    /* TEXTURE_2D */
+    const GLenum CULL_FACE                      = 0x0B44;
+    const GLenum BLEND                          = 0x0BE2;
+    const GLenum DITHER                         = 0x0BD0;
+    const GLenum STENCIL_TEST                   = 0x0B90;
+    const GLenum DEPTH_TEST                     = 0x0B71;
+    const GLenum SCISSOR_TEST                   = 0x0C11;
+    const GLenum POLYGON_OFFSET_FILL            = 0x8037;
+    const GLenum SAMPLE_ALPHA_TO_COVERAGE       = 0x809E;
+    const GLenum SAMPLE_COVERAGE                = 0x80A0;
+
+    /* ErrorCode */
+    [NeedsWindowsUndef]
+    const GLenum NO_ERROR                       = 0;
+    const GLenum INVALID_ENUM                   = 0x0500;
+    const GLenum INVALID_VALUE                  = 0x0501;
+    const GLenum INVALID_OPERATION              = 0x0502;
+    const GLenum OUT_OF_MEMORY                  = 0x0505;
+
+    /* FrontFaceDirection */
+    const GLenum CW                             = 0x0900;
+    const GLenum CCW                            = 0x0901;
+
+    /* GetPName */
+    const GLenum LINE_WIDTH                     = 0x0B21;
+    const GLenum ALIASED_POINT_SIZE_RANGE       = 0x846D;
+    const GLenum ALIASED_LINE_WIDTH_RANGE       = 0x846E;
+    const GLenum CULL_FACE_MODE                 = 0x0B45;
+    const GLenum FRONT_FACE                     = 0x0B46;
+    const GLenum DEPTH_RANGE                    = 0x0B70;
+    const GLenum DEPTH_WRITEMASK                = 0x0B72;
+    const GLenum DEPTH_CLEAR_VALUE              = 0x0B73;
+    const GLenum DEPTH_FUNC                     = 0x0B74;
+    const GLenum STENCIL_CLEAR_VALUE            = 0x0B91;
+    const GLenum STENCIL_FUNC                   = 0x0B92;
+    const GLenum STENCIL_FAIL                   = 0x0B94;
+    const GLenum STENCIL_PASS_DEPTH_FAIL        = 0x0B95;
+    const GLenum STENCIL_PASS_DEPTH_PASS        = 0x0B96;
+    const GLenum STENCIL_REF                    = 0x0B97;
+    const GLenum STENCIL_VALUE_MASK             = 0x0B93;
+    const GLenum STENCIL_WRITEMASK              = 0x0B98;
+    const GLenum STENCIL_BACK_FUNC              = 0x8800;
+    const GLenum STENCIL_BACK_FAIL              = 0x8801;
+    const GLenum STENCIL_BACK_PASS_DEPTH_FAIL   = 0x8802;
+    const GLenum STENCIL_BACK_PASS_DEPTH_PASS   = 0x8803;
+    const GLenum STENCIL_BACK_REF               = 0x8CA3;
+    const GLenum STENCIL_BACK_VALUE_MASK        = 0x8CA4;
+    const GLenum STENCIL_BACK_WRITEMASK         = 0x8CA5;
+    const GLenum VIEWPORT                       = 0x0BA2;
+    const GLenum SCISSOR_BOX                    = 0x0C10;
+    /*      SCISSOR_TEST */
+    const GLenum COLOR_CLEAR_VALUE              = 0x0C22;
+    const GLenum COLOR_WRITEMASK                = 0x0C23;
+    const GLenum UNPACK_ALIGNMENT               = 0x0CF5;
+    const GLenum PACK_ALIGNMENT                 = 0x0D05;
+    const GLenum MAX_TEXTURE_SIZE               = 0x0D33;
+    const GLenum MAX_VIEWPORT_DIMS              = 0x0D3A;
+    const GLenum SUBPIXEL_BITS                  = 0x0D50;
+    const GLenum RED_BITS                       = 0x0D52;
+    const GLenum GREEN_BITS                     = 0x0D53;
+    const GLenum BLUE_BITS                      = 0x0D54;
+    const GLenum ALPHA_BITS                     = 0x0D55;
+    const GLenum DEPTH_BITS                     = 0x0D56;
+    const GLenum STENCIL_BITS                   = 0x0D57;
+    const GLenum POLYGON_OFFSET_UNITS           = 0x2A00;
+    /*      POLYGON_OFFSET_FILL */
+    const GLenum POLYGON_OFFSET_FACTOR          = 0x8038;
+    const GLenum TEXTURE_BINDING_2D             = 0x8069;
+    const GLenum SAMPLE_BUFFERS                 = 0x80A8;
+    const GLenum SAMPLES                        = 0x80A9;
+    const GLenum SAMPLE_COVERAGE_VALUE          = 0x80AA;
+    const GLenum SAMPLE_COVERAGE_INVERT         = 0x80AB;
+
+    /* GetTextureParameter */
+    /*      TEXTURE_MAG_FILTER */
+    /*      TEXTURE_MIN_FILTER */
+    /*      TEXTURE_WRAP_S */
+    /*      TEXTURE_WRAP_T */
+
+    const GLenum COMPRESSED_TEXTURE_FORMATS     = 0x86A3;
+
+    /* HintMode */
+    const GLenum DONT_CARE                      = 0x1100;
+    const GLenum FASTEST                        = 0x1101;
+    const GLenum NICEST                         = 0x1102;
+
+    /* HintTarget */
+    const GLenum GENERATE_MIPMAP_HINT            = 0x8192;
+
+    /* DataType */
+    const GLenum BYTE                           = 0x1400;
+    const GLenum UNSIGNED_BYTE                  = 0x1401;
+    const GLenum SHORT                          = 0x1402;
+    const GLenum UNSIGNED_SHORT                 = 0x1403;
+    const GLenum INT                            = 0x1404;
+    const GLenum UNSIGNED_INT                   = 0x1405;
+    const GLenum FLOAT                          = 0x1406;
+
+    /* PixelFormat */
+    const GLenum DEPTH_COMPONENT                = 0x1902;
+    const GLenum ALPHA                          = 0x1906;
+    const GLenum RGB                            = 0x1907;
+    const GLenum RGBA                           = 0x1908;
+    const GLenum LUMINANCE                      = 0x1909;
+    const GLenum LUMINANCE_ALPHA                = 0x190A;
+
+    /* PixelType */
+    /*      UNSIGNED_BYTE */
+    const GLenum UNSIGNED_SHORT_4_4_4_4         = 0x8033;
+    const GLenum UNSIGNED_SHORT_5_5_5_1         = 0x8034;
+    const GLenum UNSIGNED_SHORT_5_6_5           = 0x8363;
+
+    /* Shaders */
+    const GLenum FRAGMENT_SHADER                  = 0x8B30;
+    const GLenum VERTEX_SHADER                    = 0x8B31;
+    const GLenum MAX_VERTEX_ATTRIBS               = 0x8869;
+    const GLenum MAX_VERTEX_UNIFORM_VECTORS       = 0x8DFB;
+    const GLenum MAX_VARYING_VECTORS              = 0x8DFC;
+    const GLenum MAX_COMBINED_TEXTURE_IMAGE_UNITS = 0x8B4D;
+    const GLenum MAX_VERTEX_TEXTURE_IMAGE_UNITS   = 0x8B4C;
+    const GLenum MAX_TEXTURE_IMAGE_UNITS          = 0x8872;
+    const GLenum MAX_FRAGMENT_UNIFORM_VECTORS     = 0x8DFD;
+    const GLenum SHADER_TYPE                      = 0x8B4F;
+    const GLenum DELETE_STATUS                    = 0x8B80;
+    const GLenum LINK_STATUS                      = 0x8B82;
+    const GLenum VALIDATE_STATUS                  = 0x8B83;
+    const GLenum ATTACHED_SHADERS                 = 0x8B85;
+    const GLenum ACTIVE_UNIFORMS                  = 0x8B86;
+    const GLenum ACTIVE_ATTRIBUTES                = 0x8B89;
+    const GLenum SHADING_LANGUAGE_VERSION         = 0x8B8C;
+    const GLenum CURRENT_PROGRAM                  = 0x8B8D;
+
+    /* StencilFunction */
+    const GLenum NEVER                          = 0x0200;
+    const GLenum LESS                           = 0x0201;
+    const GLenum EQUAL                          = 0x0202;
+    const GLenum LEQUAL                         = 0x0203;
+    const GLenum GREATER                        = 0x0204;
+    const GLenum NOTEQUAL                       = 0x0205;
+    const GLenum GEQUAL                         = 0x0206;
+    const GLenum ALWAYS                         = 0x0207;
+
+    /* StencilOp */
+    /*      ZERO */
+    const GLenum KEEP                           = 0x1E00;
+    const GLenum REPLACE                        = 0x1E01;
+    const GLenum INCR                           = 0x1E02;
+    const GLenum DECR                           = 0x1E03;
+    const GLenum INVERT                         = 0x150A;
+    const GLenum INCR_WRAP                      = 0x8507;
+    const GLenum DECR_WRAP                      = 0x8508;
+
+    /* StringName */
+    const GLenum VENDOR                         = 0x1F00;
+    const GLenum RENDERER                       = 0x1F01;
+    const GLenum VERSION                        = 0x1F02;
+
+    /* TextureMagFilter */
+    const GLenum NEAREST                        = 0x2600;
+    const GLenum LINEAR                         = 0x2601;
+
+    /* TextureMinFilter */
+    /*      NEAREST */
+    /*      LINEAR */
+    const GLenum NEAREST_MIPMAP_NEAREST         = 0x2700;
+    const GLenum LINEAR_MIPMAP_NEAREST          = 0x2701;
+    const GLenum NEAREST_MIPMAP_LINEAR          = 0x2702;
+    const GLenum LINEAR_MIPMAP_LINEAR           = 0x2703;
+
+    /* TextureParameterName */
+    const GLenum TEXTURE_MAG_FILTER             = 0x2800;
+    const GLenum TEXTURE_MIN_FILTER             = 0x2801;
+    const GLenum TEXTURE_WRAP_S                 = 0x2802;
+    const GLenum TEXTURE_WRAP_T                 = 0x2803;
+
+    /* TextureTarget */
+    const GLenum TEXTURE_2D                     = 0x0DE1;
+    const GLenum TEXTURE                        = 0x1702;
+
+    const GLenum TEXTURE_CUBE_MAP               = 0x8513;
+    const GLenum TEXTURE_BINDING_CUBE_MAP       = 0x8514;
+    const GLenum TEXTURE_CUBE_MAP_POSITIVE_X    = 0x8515;
+    const GLenum TEXTURE_CUBE_MAP_NEGATIVE_X    = 0x8516;
+    const GLenum TEXTURE_CUBE_MAP_POSITIVE_Y    = 0x8517;
+    const GLenum TEXTURE_CUBE_MAP_NEGATIVE_Y    = 0x8518;
+    const GLenum TEXTURE_CUBE_MAP_POSITIVE_Z    = 0x8519;
+    const GLenum TEXTURE_CUBE_MAP_NEGATIVE_Z    = 0x851A;
+    const GLenum MAX_CUBE_MAP_TEXTURE_SIZE      = 0x851C;
+
+    /* TextureUnit */
+    const GLenum TEXTURE0                       = 0x84C0;
+    const GLenum TEXTURE1                       = 0x84C1;
+    const GLenum TEXTURE2                       = 0x84C2;
+    const GLenum TEXTURE3                       = 0x84C3;
+    const GLenum TEXTURE4                       = 0x84C4;
+    const GLenum TEXTURE5                       = 0x84C5;
+    const GLenum TEXTURE6                       = 0x84C6;
+    const GLenum TEXTURE7                       = 0x84C7;
+    const GLenum TEXTURE8                       = 0x84C8;
+    const GLenum TEXTURE9                       = 0x84C9;
+    const GLenum TEXTURE10                      = 0x84CA;
+    const GLenum TEXTURE11                      = 0x84CB;
+    const GLenum TEXTURE12                      = 0x84CC;
+    const GLenum TEXTURE13                      = 0x84CD;
+    const GLenum TEXTURE14                      = 0x84CE;
+    const GLenum TEXTURE15                      = 0x84CF;
+    const GLenum TEXTURE16                      = 0x84D0;
+    const GLenum TEXTURE17                      = 0x84D1;
+    const GLenum TEXTURE18                      = 0x84D2;
+    const GLenum TEXTURE19                      = 0x84D3;
+    const GLenum TEXTURE20                      = 0x84D4;
+    const GLenum TEXTURE21                      = 0x84D5;
+    const GLenum TEXTURE22                      = 0x84D6;
+    const GLenum TEXTURE23                      = 0x84D7;
+    const GLenum TEXTURE24                      = 0x84D8;
+    const GLenum TEXTURE25                      = 0x84D9;
+    const GLenum TEXTURE26                      = 0x84DA;
+    const GLenum TEXTURE27                      = 0x84DB;
+    const GLenum TEXTURE28                      = 0x84DC;
+    const GLenum TEXTURE29                      = 0x84DD;
+    const GLenum TEXTURE30                      = 0x84DE;
+    const GLenum TEXTURE31                      = 0x84DF;
+    const GLenum ACTIVE_TEXTURE                 = 0x84E0;
+
+    /* TextureWrapMode */
+    const GLenum REPEAT                         = 0x2901;
+    const GLenum CLAMP_TO_EDGE                  = 0x812F;
+    const GLenum MIRRORED_REPEAT                = 0x8370;
+
+    /* Uniform Types */
+    const GLenum FLOAT_VEC2                     = 0x8B50;
+    const GLenum FLOAT_VEC3                     = 0x8B51;
+    const GLenum FLOAT_VEC4                     = 0x8B52;
+    const GLenum INT_VEC2                       = 0x8B53;
+    const GLenum INT_VEC3                       = 0x8B54;
+    const GLenum INT_VEC4                       = 0x8B55;
+    const GLenum BOOL                           = 0x8B56;
+    const GLenum BOOL_VEC2                      = 0x8B57;
+    const GLenum BOOL_VEC3                      = 0x8B58;
+    const GLenum BOOL_VEC4                      = 0x8B59;
+    const GLenum FLOAT_MAT2                     = 0x8B5A;
+    const GLenum FLOAT_MAT3                     = 0x8B5B;
+    const GLenum FLOAT_MAT4                     = 0x8B5C;
+    const GLenum SAMPLER_2D                     = 0x8B5E;
+    const GLenum SAMPLER_CUBE                   = 0x8B60;
+
+    /* Vertex Arrays */
+    const GLenum VERTEX_ATTRIB_ARRAY_ENABLED        = 0x8622;
+    const GLenum VERTEX_ATTRIB_ARRAY_SIZE           = 0x8623;
+    const GLenum VERTEX_ATTRIB_ARRAY_STRIDE         = 0x8624;
+    const GLenum VERTEX_ATTRIB_ARRAY_TYPE           = 0x8625;
+    const GLenum VERTEX_ATTRIB_ARRAY_NORMALIZED     = 0x886A;
+    const GLenum VERTEX_ATTRIB_ARRAY_POINTER        = 0x8645;
+    const GLenum VERTEX_ATTRIB_ARRAY_BUFFER_BINDING = 0x889F;
+
+    /* Read Format */
+    const GLenum IMPLEMENTATION_COLOR_READ_TYPE   = 0x8B9A;
+    const GLenum IMPLEMENTATION_COLOR_READ_FORMAT = 0x8B9B;
+
+    /* Shader Source */
+    const GLenum COMPILE_STATUS                 = 0x8B81;
+
+    /* Shader Precision-Specified Types */
+    const GLenum LOW_FLOAT                      = 0x8DF0;
+    const GLenum MEDIUM_FLOAT                   = 0x8DF1;
+    const GLenum HIGH_FLOAT                     = 0x8DF2;
+    const GLenum LOW_INT                        = 0x8DF3;
+    const GLenum MEDIUM_INT                     = 0x8DF4;
+    const GLenum HIGH_INT                       = 0x8DF5;
+
+    /* Framebuffer Object. */
+    const GLenum FRAMEBUFFER                    = 0x8D40;
+    const GLenum RENDERBUFFER                   = 0x8D41;
+
+    const GLenum RGBA4                          = 0x8056;
+    const GLenum RGB5_A1                        = 0x8057;
+    const GLenum RGB565                         = 0x8D62;
+    const GLenum DEPTH_COMPONENT16              = 0x81A5;
+    const GLenum STENCIL_INDEX8                 = 0x8D48;
+    const GLenum DEPTH_STENCIL                  = 0x84F9;
+
+    const GLenum RENDERBUFFER_WIDTH             = 0x8D42;
+    const GLenum RENDERBUFFER_HEIGHT            = 0x8D43;
+    const GLenum RENDERBUFFER_INTERNAL_FORMAT   = 0x8D44;
+    const GLenum RENDERBUFFER_RED_SIZE          = 0x8D50;
+    const GLenum RENDERBUFFER_GREEN_SIZE        = 0x8D51;
+    const GLenum RENDERBUFFER_BLUE_SIZE         = 0x8D52;
+    const GLenum RENDERBUFFER_ALPHA_SIZE        = 0x8D53;
+    const GLenum RENDERBUFFER_DEPTH_SIZE        = 0x8D54;
+    const GLenum RENDERBUFFER_STENCIL_SIZE      = 0x8D55;
+
+    const GLenum FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE           = 0x8CD0;
+    const GLenum FRAMEBUFFER_ATTACHMENT_OBJECT_NAME           = 0x8CD1;
+    const GLenum FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL         = 0x8CD2;
+    const GLenum FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE = 0x8CD3;
+
+    const GLenum COLOR_ATTACHMENT0              = 0x8CE0;
+    const GLenum DEPTH_ATTACHMENT               = 0x8D00;
+    const GLenum STENCIL_ATTACHMENT             = 0x8D20;
+    const GLenum DEPTH_STENCIL_ATTACHMENT       = 0x821A;
+
+    const GLenum NONE                           = 0;
+
+    const GLenum FRAMEBUFFER_COMPLETE                      = 0x8CD5;
+    const GLenum FRAMEBUFFER_INCOMPLETE_ATTACHMENT         = 0x8CD6;
+    const GLenum FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT = 0x8CD7;
+    const GLenum FRAMEBUFFER_INCOMPLETE_DIMENSIONS         = 0x8CD9;
+    const GLenum FRAMEBUFFER_UNSUPPORTED                   = 0x8CDD;
+
+    const GLenum FRAMEBUFFER_BINDING            = 0x8CA6;
+    const GLenum RENDERBUFFER_BINDING           = 0x8CA7;
+    const GLenum MAX_RENDERBUFFER_SIZE          = 0x84E8;
+
+    const GLenum INVALID_FRAMEBUFFER_OPERATION  = 0x0506;
+
+    /* WebGL-specific enums */
+    const GLenum UNPACK_FLIP_Y_WEBGL            = 0x9240;
+    const GLenum UNPACK_PREMULTIPLY_ALPHA_WEBGL = 0x9241;
+    const GLenum CONTEXT_LOST_WEBGL             = 0x9242;
+    const GLenum UNPACK_COLORSPACE_CONVERSION_WEBGL = 0x9243;
+    const GLenum BROWSER_DEFAULT_WEBGL          = 0x9244;
+
+    // The canvas might actually be null in some cases, apparently.
+    readonly attribute (HTMLCanvasElement or OffscreenCanvas)? canvas;
+    readonly attribute GLsizei drawingBufferWidth;
+    readonly attribute GLsizei drawingBufferHeight;
+
+    [WebGLHandlesContextLoss] WebGLContextAttributes? getContextAttributes();
+    [WebGLHandlesContextLoss] boolean isContextLost();
+
+    [NeedsCallerType]
+    sequence<DOMString>? getSupportedExtensions();
+
+    [Throws, NeedsCallerType]
+    object? getExtension(DOMString name);
+
+    void activeTexture(GLenum texture);
+    void attachShader(WebGLProgram program, WebGLShader shader);
+    void bindAttribLocation(WebGLProgram program, GLuint index, DOMString name);
+    void bindBuffer(GLenum target, WebGLBuffer? buffer);
+    void bindFramebuffer(GLenum target, WebGLFramebuffer? framebuffer);
+    void bindRenderbuffer(GLenum target, WebGLRenderbuffer? renderbuffer);
+    void bindTexture(GLenum target, WebGLTexture? texture);
+    void blendColor(GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha);
+    void blendEquation(GLenum mode);
+    void blendEquationSeparate(GLenum modeRGB, GLenum modeAlpha);
+    void blendFunc(GLenum sfactor, GLenum dfactor);
+    void blendFuncSeparate(GLenum srcRGB, GLenum dstRGB,
+                           GLenum srcAlpha, GLenum dstAlpha);
+
+    [WebGLHandlesContextLoss] GLenum checkFramebufferStatus(GLenum target);
+    void clear(GLbitfield mask);
+    void clearColor(GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha);
+    void clearDepth(GLclampf depth);
+    void clearStencil(GLint s);
+    void colorMask(GLboolean red, GLboolean green, GLboolean blue, GLboolean alpha);
+    void compileShader(WebGLShader shader);
+
+    void copyTexImage2D(GLenum target, GLint level, GLenum internalformat,
+                        GLint x, GLint y, GLsizei width, GLsizei height,
+                        GLint border);
+    void copyTexSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                           GLint x, GLint y, GLsizei width, GLsizei height);
+
+    WebGLBuffer? createBuffer();
+    WebGLFramebuffer? createFramebuffer();
+    WebGLProgram? createProgram();
+    WebGLRenderbuffer? createRenderbuffer();
+    WebGLShader? createShader(GLenum type);
+    WebGLTexture? createTexture();
+
+    void cullFace(GLenum mode);
+
+    void deleteBuffer(WebGLBuffer? buffer);
+    void deleteFramebuffer(WebGLFramebuffer? framebuffer);
+    void deleteProgram(WebGLProgram? program);
+    void deleteRenderbuffer(WebGLRenderbuffer? renderbuffer);
+    void deleteShader(WebGLShader? shader);
+    void deleteTexture(WebGLTexture? texture);
+
+    void depthFunc(GLenum func);
+    void depthMask(GLboolean flag);
+    void depthRange(GLclampf zNear, GLclampf zFar);
+    void detachShader(WebGLProgram program, WebGLShader shader);
+    void disable(GLenum cap);
+    void disableVertexAttribArray(GLuint index);
+    void drawArrays(GLenum mode, GLint first, GLsizei count);
+    void drawElements(GLenum mode, GLsizei count, GLenum type, GLintptr offset);
+
+    void enable(GLenum cap);
+    void enableVertexAttribArray(GLuint index);
+    void finish();
+    void flush();
+    void framebufferRenderbuffer(GLenum target, GLenum attachment,
+                                 GLenum renderbuffertarget,
+                                 WebGLRenderbuffer? renderbuffer);
+    void framebufferTexture2D(GLenum target, GLenum attachment, GLenum textarget,
+                              WebGLTexture? texture, GLint level);
+    void frontFace(GLenum mode);
+
+    void generateMipmap(GLenum target);
+
+    [NewObject]
+    WebGLActiveInfo? getActiveAttrib(WebGLProgram program, GLuint index);
+    [NewObject]
+    WebGLActiveInfo? getActiveUniform(WebGLProgram program, GLuint index);
+
+    sequence<WebGLShader>? getAttachedShaders(WebGLProgram program);
+
+    [WebGLHandlesContextLoss] GLint getAttribLocation(WebGLProgram program, DOMString name);
+
+    any getBufferParameter(GLenum target, GLenum pname);
+    [Throws]
+    any getParameter(GLenum pname);
+
+    [WebGLHandlesContextLoss] GLenum getError();
+
+    [Throws]
+    any getFramebufferAttachmentParameter(GLenum target, GLenum attachment,
+                                          GLenum pname);
+    any getProgramParameter(WebGLProgram program, GLenum pname);
+    DOMString? getProgramInfoLog(WebGLProgram program);
+    any getRenderbufferParameter(GLenum target, GLenum pname);
+    any getShaderParameter(WebGLShader shader, GLenum pname);
+
+    [NewObject]
+    WebGLShaderPrecisionFormat? getShaderPrecisionFormat(GLenum shadertype, GLenum precisiontype);
+
+    DOMString? getShaderInfoLog(WebGLShader shader);
+
+    DOMString? getShaderSource(WebGLShader shader);
+
+    any getTexParameter(GLenum target, GLenum pname);
+
+    any getUniform(WebGLProgram program, WebGLUniformLocation location);
+
+    [NewObject]
+    WebGLUniformLocation? getUniformLocation(WebGLProgram program, DOMString name);
+
+    [Throws]
+    any getVertexAttrib(GLuint index, GLenum pname);
+
+    [WebGLHandlesContextLoss] GLintptr getVertexAttribOffset(GLuint index, GLenum pname);
+
+    void hint(GLenum target, GLenum mode);
+    [WebGLHandlesContextLoss] GLboolean isBuffer(WebGLBuffer? buffer);
+    [WebGLHandlesContextLoss] GLboolean isEnabled(GLenum cap);
+    [WebGLHandlesContextLoss] GLboolean isFramebuffer(WebGLFramebuffer? framebuffer);
+    [WebGLHandlesContextLoss] GLboolean isProgram(WebGLProgram? program);
+    [WebGLHandlesContextLoss] GLboolean isRenderbuffer(WebGLRenderbuffer? renderbuffer);
+    [WebGLHandlesContextLoss] GLboolean isShader(WebGLShader? shader);
+    [WebGLHandlesContextLoss] GLboolean isTexture(WebGLTexture? texture);
+    void lineWidth(GLfloat width);
+    void linkProgram(WebGLProgram program);
+    void pixelStorei(GLenum pname, GLint param);
+    void polygonOffset(GLfloat factor, GLfloat units);
+
+    void renderbufferStorage(GLenum target, GLenum internalformat,
+                             GLsizei width, GLsizei height);
+    void sampleCoverage(GLclampf value, GLboolean invert);
+    void scissor(GLint x, GLint y, GLsizei width, GLsizei height);
+
+    void shaderSource(WebGLShader shader, DOMString source);
+
+    void stencilFunc(GLenum func, GLint ref, GLuint mask);
+    void stencilFuncSeparate(GLenum face, GLenum func, GLint ref, GLuint mask);
+    void stencilMask(GLuint mask);
+    void stencilMaskSeparate(GLenum face, GLuint mask);
+    void stencilOp(GLenum fail, GLenum zfail, GLenum zpass);
+    void stencilOpSeparate(GLenum face, GLenum fail, GLenum zfail, GLenum zpass);
+
+    void texParameterf(GLenum target, GLenum pname, GLfloat param);
+    void texParameteri(GLenum target, GLenum pname, GLint param);
+
+    void uniform1f(WebGLUniformLocation? location, GLfloat x);
+    void uniform2f(WebGLUniformLocation? location, GLfloat x, GLfloat y);
+    void uniform3f(WebGLUniformLocation? location, GLfloat x, GLfloat y, GLfloat z);
+    void uniform4f(WebGLUniformLocation? location, GLfloat x, GLfloat y, GLfloat z, GLfloat w);
+
+    void uniform1i(WebGLUniformLocation? location, GLint x);
+    void uniform2i(WebGLUniformLocation? location, GLint x, GLint y);
+    void uniform3i(WebGLUniformLocation? location, GLint x, GLint y, GLint z);
+    void uniform4i(WebGLUniformLocation? location, GLint x, GLint y, GLint z, GLint w);
+
+    void useProgram(WebGLProgram? program);
+    void validateProgram(WebGLProgram program);
+
+    void vertexAttrib1f(GLuint indx, GLfloat x);
+    void vertexAttrib1fv(GLuint indx, Float32List values);
+    void vertexAttrib2f(GLuint indx, GLfloat x, GLfloat y);
+    void vertexAttrib2fv(GLuint indx, Float32List values);
+    void vertexAttrib3f(GLuint indx, GLfloat x, GLfloat y, GLfloat z);
+    void vertexAttrib3fv(GLuint indx, Float32List values);
+    void vertexAttrib4f(GLuint indx, GLfloat x, GLfloat y, GLfloat z, GLfloat w);
+    void vertexAttrib4fv(GLuint indx, Float32List values);
+    void vertexAttribPointer(GLuint indx, GLint size, GLenum type,
+                             GLboolean normalized, GLsizei stride, GLintptr offset);
+
+    void viewport(GLint x, GLint y, GLsizei width, GLsizei height);
+};
+
+[Exposed=(Window,Worker),
+ Func="mozilla::dom::OffscreenCanvas::PrefEnabledOnWorkerThread"]
+interface WebGLRenderingContext {
+    // bufferData has WebGL2 overloads.
+    void bufferData(GLenum target, GLsizeiptr size, GLenum usage);
+    void bufferData(GLenum target, ArrayBuffer? data, GLenum usage);
+    void bufferData(GLenum target, ArrayBufferView data, GLenum usage);
+    // bufferSubData has WebGL2 overloads.
+    void bufferSubData(GLenum target, GLintptr offset, ArrayBuffer data);
+    void bufferSubData(GLenum target, GLintptr offset, ArrayBufferView data);
+
+    // compressedTexImage2D has WebGL2 overloads.
+    void compressedTexImage2D(GLenum target, GLint level, GLenum internalformat,
+                              GLsizei width, GLsizei height, GLint border,
+                              ArrayBufferView data);
+    // compressedTexSubImage2D has WebGL2 overloads.
+    void compressedTexSubImage2D(GLenum target, GLint level,
+                                 GLint xoffset, GLint yoffset,
+                                 GLsizei width, GLsizei height, GLenum format,
+                                 ArrayBufferView data);
+
+    // readPixels has WebGL2 overloads.
+    [Throws, NeedsCallerType]
+    void readPixels(GLint x, GLint y, GLsizei width, GLsizei height,
+                    GLenum format, GLenum type, ArrayBufferView? pixels);
+
+    // texImage2D has WebGL2 overloads.
+    // Overloads must share [Throws].
+    [Throws] // Can't actually throw.
+    void texImage2D(GLenum target, GLint level, GLint internalformat,
+                    GLsizei width, GLsizei height, GLint border, GLenum format,
+                    GLenum type, ArrayBufferView? pixels);
+    [Throws] // Can't actually throw.
+    void texImage2D(GLenum target, GLint level, GLint internalformat,
+                    GLenum format, GLenum type, ImageBitmap pixels);
+    [Throws] // Can't actually throw.
+    void texImage2D(GLenum target, GLint level, GLint internalformat,
+                    GLenum format, GLenum type, ImageData pixels);
+    [Throws]
+    void texImage2D(GLenum target, GLint level, GLint internalformat,
+                    GLenum format, GLenum type, HTMLImageElement image); // May throw DOMException
+    [Throws]
+    void texImage2D(GLenum target, GLint level, GLint internalformat,
+                    GLenum format, GLenum type, HTMLCanvasElement canvas); // May throw DOMException
+    [Throws]
+    void texImage2D(GLenum target, GLint level, GLint internalformat,
+                    GLenum format, GLenum type, HTMLVideoElement video); // May throw DOMException
+
+    // texSubImage2D has WebGL2 overloads.
+    [Throws] // Can't actually throw.
+    void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                       GLsizei width, GLsizei height,
+                       GLenum format, GLenum type, ArrayBufferView? pixels);
+    [Throws] // Can't actually throw.
+    void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                       GLenum format, GLenum type, ImageBitmap pixels);
+    [Throws] // Can't actually throw.
+    void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                       GLenum format, GLenum type, ImageData pixels);
+    [Throws]
+    void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                       GLenum format, GLenum type, HTMLImageElement image); // May throw DOMException
+    [Throws]
+    void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                       GLenum format, GLenum type, HTMLCanvasElement canvas); // May throw DOMException
+    [Throws]
+    void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                       GLenum format, GLenum type, HTMLVideoElement video); // May throw DOMException
+
+    // uniform*fv have WebGL2 overloads, or rather extensions, that are not
+    // distinguishable from the WebGL1 versions when called with two arguments.
+    void uniform1fv(WebGLUniformLocation? location, Float32List data);
+    void uniform2fv(WebGLUniformLocation? location, Float32List data);
+    void uniform3fv(WebGLUniformLocation? location, Float32List data);
+    void uniform4fv(WebGLUniformLocation? location, Float32List data);
+
+    // uniform*iv have WebGL2 overloads, or rather extensions, that are not
+    // distinguishable from the WebGL1 versions when called with two arguments.
+    void uniform1iv(WebGLUniformLocation? location, Int32List data);
+    void uniform2iv(WebGLUniformLocation? location, Int32List data);
+    void uniform3iv(WebGLUniformLocation? location, Int32List data);
+    void uniform4iv(WebGLUniformLocation? location, Int32List data);
+
+    // uniformMatrix*fv have WebGL2 overloads, or rather extensions, that are
+    // not distinguishable from the WebGL1 versions when called with two
+    // arguments.
+    void uniformMatrix2fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data);
+    void uniformMatrix3fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data);
+    void uniformMatrix4fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data);
+};
+
+WebGLRenderingContext implements WebGLRenderingContextBase;
+
+// For OffscreenCanvas
+// Reference: https://wiki.whatwg.org/wiki/OffscreenCanvas
+[Exposed=(Window,Worker)]
+partial interface WebGLRenderingContext {
+    [Func="mozilla::dom::DOMPrefs::OffscreenCanvasEnabled"]
+    void commit();
+};
+
+////////////////////////////////////////
+// specific extension interfaces
+
+[NoInterfaceObject]
+interface WEBGL_compressed_texture_s3tc
+{
+    const GLenum COMPRESSED_RGB_S3TC_DXT1_EXT  = 0x83F0;
+    const GLenum COMPRESSED_RGBA_S3TC_DXT1_EXT = 0x83F1;
+    const GLenum COMPRESSED_RGBA_S3TC_DXT3_EXT = 0x83F2;
+    const GLenum COMPRESSED_RGBA_S3TC_DXT5_EXT = 0x83F3;
+};
+
+[NoInterfaceObject]
+interface WEBGL_compressed_texture_s3tc_srgb {
+    /* Compressed Texture Formats */
+    const GLenum COMPRESSED_SRGB_S3TC_DXT1_EXT        = 0x8C4C;
+    const GLenum COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT  = 0x8C4D;
+    const GLenum COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT  = 0x8C4E;
+    const GLenum COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT  = 0x8C4F;
+};
+
+[NoInterfaceObject]
+interface WEBGL_compressed_texture_astc {
+    /* Compressed Texture Format */
+    const GLenum COMPRESSED_RGBA_ASTC_4x4_KHR = 0x93B0;
+    const GLenum COMPRESSED_RGBA_ASTC_5x4_KHR = 0x93B1;
+    const GLenum COMPRESSED_RGBA_ASTC_5x5_KHR = 0x93B2;
+    const GLenum COMPRESSED_RGBA_ASTC_6x5_KHR = 0x93B3;
+    const GLenum COMPRESSED_RGBA_ASTC_6x6_KHR = 0x93B4;
+    const GLenum COMPRESSED_RGBA_ASTC_8x5_KHR = 0x93B5;
+    const GLenum COMPRESSED_RGBA_ASTC_8x6_KHR = 0x93B6;
+    const GLenum COMPRESSED_RGBA_ASTC_8x8_KHR = 0x93B7;
+    const GLenum COMPRESSED_RGBA_ASTC_10x5_KHR = 0x93B8;
+    const GLenum COMPRESSED_RGBA_ASTC_10x6_KHR = 0x93B9;
+    const GLenum COMPRESSED_RGBA_ASTC_10x8_KHR = 0x93BA;
+    const GLenum COMPRESSED_RGBA_ASTC_10x10_KHR = 0x93BB;
+    const GLenum COMPRESSED_RGBA_ASTC_12x10_KHR = 0x93BC;
+    const GLenum COMPRESSED_RGBA_ASTC_12x12_KHR = 0x93BD;
+
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR = 0x93D0;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHR = 0x93D1;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_5x5_KHR = 0x93D2;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_6x5_KHR = 0x93D3;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_6x6_KHR = 0x93D4;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_8x5_KHR = 0x93D5;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_8x6_KHR = 0x93D6;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR = 0x93D7;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_10x5_KHR = 0x93D8;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR = 0x93D9;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_10x8_KHR = 0x93DA;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_10x10_KHR = 0x93DB;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHR = 0x93DC;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHR = 0x93DD;
+
+    // Profile query support.
+    sequence<DOMString>? getSupportedProfiles();
+};
+
+[NoInterfaceObject]
+interface WEBGL_compressed_texture_atc
+{
+    const GLenum COMPRESSED_RGB_ATC_WEBGL                     = 0x8C92;
+    const GLenum COMPRESSED_RGBA_ATC_EXPLICIT_ALPHA_WEBGL     = 0x8C93;
+    const GLenum COMPRESSED_RGBA_ATC_INTERPOLATED_ALPHA_WEBGL = 0x87EE;
+};
+
+[NoInterfaceObject]
+interface WEBGL_compressed_texture_etc
+{
+    const GLenum COMPRESSED_R11_EAC                                 = 0x9270;
+    const GLenum COMPRESSED_SIGNED_R11_EAC                          = 0x9271;
+    const GLenum COMPRESSED_RG11_EAC                                = 0x9272;
+    const GLenum COMPRESSED_SIGNED_RG11_EAC                         = 0x9273;
+    const GLenum COMPRESSED_RGB8_ETC2                               = 0x9274;
+    const GLenum COMPRESSED_SRGB8_ETC2                              = 0x9275;
+    const GLenum COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2           = 0x9276;
+    const GLenum COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2          = 0x9277;
+    const GLenum COMPRESSED_RGBA8_ETC2_EAC                          = 0x9278;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ETC2_EAC                   = 0x9279;
+};
+
+[NoInterfaceObject]
+interface WEBGL_compressed_texture_etc1
+{
+    const GLenum COMPRESSED_RGB_ETC1_WEBGL = 0x8D64;
+};
+
+[NoInterfaceObject]
+interface WEBGL_compressed_texture_pvrtc
+{
+    const GLenum COMPRESSED_RGB_PVRTC_4BPPV1_IMG  = 0x8C00;
+    const GLenum COMPRESSED_RGB_PVRTC_2BPPV1_IMG  = 0x8C01;
+    const GLenum COMPRESSED_RGBA_PVRTC_4BPPV1_IMG = 0x8C02;
+    const GLenum COMPRESSED_RGBA_PVRTC_2BPPV1_IMG = 0x8C03;
+};
+
+[NoInterfaceObject]
+interface WEBGL_debug_renderer_info
+{
+    const GLenum UNMASKED_VENDOR_WEBGL        = 0x9245;
+    const GLenum UNMASKED_RENDERER_WEBGL      = 0x9246;
+};
+
+[NoInterfaceObject]
+interface WEBGL_debug_shaders
+{
+    DOMString getTranslatedShaderSource(WebGLShader shader);
+};
+
+[NoInterfaceObject]
+interface WEBGL_depth_texture
+{
+    const GLenum UNSIGNED_INT_24_8_WEBGL = 0x84FA;
+};
+
+[NoInterfaceObject]
+interface OES_element_index_uint
+{
+};
+
+[NoInterfaceObject]
+interface EXT_frag_depth
+{
+};
+
+[NoInterfaceObject]
+interface WEBGL_lose_context {
+    void loseContext();
+    void restoreContext();
+};
+
+[NoInterfaceObject]
+interface EXT_texture_filter_anisotropic
+{
+    const GLenum TEXTURE_MAX_ANISOTROPY_EXT     = 0x84FE;
+    const GLenum MAX_TEXTURE_MAX_ANISOTROPY_EXT = 0x84FF;
+};
+
+[NoInterfaceObject]
+interface EXT_sRGB
+{
+    const GLenum SRGB_EXT                                  = 0x8C40;
+    const GLenum SRGB_ALPHA_EXT                            = 0x8C42;
+    const GLenum SRGB8_ALPHA8_EXT                          = 0x8C43;
+    const GLenum FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING_EXT = 0x8210;
+};
+
+[NoInterfaceObject]
+interface OES_standard_derivatives {
+    const GLenum FRAGMENT_SHADER_DERIVATIVE_HINT_OES = 0x8B8B;
+};
+
+[NoInterfaceObject]
+interface OES_texture_float
+{
+};
+
+[NoInterfaceObject]
+interface WEBGL_draw_buffers {
+    const GLenum COLOR_ATTACHMENT0_WEBGL     = 0x8CE0;
+    const GLenum COLOR_ATTACHMENT1_WEBGL     = 0x8CE1;
+    const GLenum COLOR_ATTACHMENT2_WEBGL     = 0x8CE2;
+    const GLenum COLOR_ATTACHMENT3_WEBGL     = 0x8CE3;
+    const GLenum COLOR_ATTACHMENT4_WEBGL     = 0x8CE4;
+    const GLenum COLOR_ATTACHMENT5_WEBGL     = 0x8CE5;
+    const GLenum COLOR_ATTACHMENT6_WEBGL     = 0x8CE6;
+    const GLenum COLOR_ATTACHMENT7_WEBGL     = 0x8CE7;
+    const GLenum COLOR_ATTACHMENT8_WEBGL     = 0x8CE8;
+    const GLenum COLOR_ATTACHMENT9_WEBGL     = 0x8CE9;
+    const GLenum COLOR_ATTACHMENT10_WEBGL    = 0x8CEA;
+    const GLenum COLOR_ATTACHMENT11_WEBGL    = 0x8CEB;
+    const GLenum COLOR_ATTACHMENT12_WEBGL    = 0x8CEC;
+    const GLenum COLOR_ATTACHMENT13_WEBGL    = 0x8CED;
+    const GLenum COLOR_ATTACHMENT14_WEBGL    = 0x8CEE;
+    const GLenum COLOR_ATTACHMENT15_WEBGL    = 0x8CEF;
+
+    const GLenum DRAW_BUFFER0_WEBGL          = 0x8825;
+    const GLenum DRAW_BUFFER1_WEBGL          = 0x8826;
+    const GLenum DRAW_BUFFER2_WEBGL          = 0x8827;
+    const GLenum DRAW_BUFFER3_WEBGL          = 0x8828;
+    const GLenum DRAW_BUFFER4_WEBGL          = 0x8829;
+    const GLenum DRAW_BUFFER5_WEBGL          = 0x882A;
+    const GLenum DRAW_BUFFER6_WEBGL          = 0x882B;
+    const GLenum DRAW_BUFFER7_WEBGL          = 0x882C;
+    const GLenum DRAW_BUFFER8_WEBGL          = 0x882D;
+    const GLenum DRAW_BUFFER9_WEBGL          = 0x882E;
+    const GLenum DRAW_BUFFER10_WEBGL         = 0x882F;
+    const GLenum DRAW_BUFFER11_WEBGL         = 0x8830;
+    const GLenum DRAW_BUFFER12_WEBGL         = 0x8831;
+    const GLenum DRAW_BUFFER13_WEBGL         = 0x8832;
+    const GLenum DRAW_BUFFER14_WEBGL         = 0x8833;
+    const GLenum DRAW_BUFFER15_WEBGL         = 0x8834;
+
+    const GLenum MAX_COLOR_ATTACHMENTS_WEBGL = 0x8CDF;
+    const GLenum MAX_DRAW_BUFFERS_WEBGL      = 0x8824;
+
+    void drawBuffersWEBGL(sequence<GLenum> buffers);
+};
+
+[NoInterfaceObject]
+interface OES_texture_float_linear
+{
+};
+
+[NoInterfaceObject]
+interface EXT_shader_texture_lod
+{
+};
+
+[NoInterfaceObject]
+interface OES_texture_half_float
+{
+    const GLenum HALF_FLOAT_OES = 0x8D61;
+};
+
+[NoInterfaceObject]
+interface OES_texture_half_float_linear
+{
+};
+
+[NoInterfaceObject]
+interface WEBGL_color_buffer_float
+{
+    const GLenum RGBA32F_EXT = 0x8814;
+    const GLenum RGB32F_EXT = 0x8815;
+    const GLenum FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE_EXT = 0x8211;
+    const GLenum UNSIGNED_NORMALIZED_EXT = 0x8C17;
+};
+
+[NoInterfaceObject]
+interface EXT_color_buffer_half_float
+{
+    const GLenum RGBA16F_EXT = 0x881A;
+    const GLenum RGB16F_EXT = 0x881B;
+    const GLenum FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE_EXT = 0x8211;
+    const GLenum UNSIGNED_NORMALIZED_EXT = 0x8C17;
+};
+
+[NoInterfaceObject]
+interface OES_vertex_array_object {
+    const GLenum VERTEX_ARRAY_BINDING_OES = 0x85B5;
+
+    WebGLVertexArrayObject? createVertexArrayOES();
+    void deleteVertexArrayOES(WebGLVertexArrayObject? arrayObject);
+    [WebGLHandlesContextLoss] GLboolean isVertexArrayOES(WebGLVertexArrayObject? arrayObject);
+    void bindVertexArrayOES(WebGLVertexArrayObject? arrayObject);
+};
+
+[NoInterfaceObject]
+interface ANGLE_instanced_arrays {
+    const GLenum VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE = 0x88FE;
+
+    void drawArraysInstancedANGLE(GLenum mode, GLint first, GLsizei count, GLsizei primcount);
+    void drawElementsInstancedANGLE(GLenum mode, GLsizei count, GLenum type, GLintptr offset, GLsizei primcount);
+    void vertexAttribDivisorANGLE(GLuint index, GLuint divisor);
+};
+
+[NoInterfaceObject]
+interface EXT_blend_minmax {
+    const GLenum MIN_EXT = 0x8007;
+    const GLenum MAX_EXT = 0x8008;
+};
+
+interface WebGLQuery {
+};
+
+[NoInterfaceObject]
+interface EXT_disjoint_timer_query {
+    const GLenum QUERY_COUNTER_BITS_EXT = 0x8864;
+    const GLenum CURRENT_QUERY_EXT = 0x8865;
+    const GLenum QUERY_RESULT_EXT = 0x8866;
+    const GLenum QUERY_RESULT_AVAILABLE_EXT = 0x8867;
+    const GLenum TIME_ELAPSED_EXT = 0x88BF;
+    const GLenum TIMESTAMP_EXT = 0x8E28;
+    const GLenum GPU_DISJOINT_EXT = 0x8FBB;
+
+    WebGLQuery? createQueryEXT();
+    void deleteQueryEXT(WebGLQuery? query);
+    [WebGLHandlesContextLoss] boolean isQueryEXT(WebGLQuery? query);
+    void beginQueryEXT(GLenum target, WebGLQuery query);
+    void endQueryEXT(GLenum target);
+    void queryCounterEXT(WebGLQuery query, GLenum target);
+    any getQueryEXT(GLenum target, GLenum pname);
+    any getQueryObjectEXT(WebGLQuery query, GLenum pname);
+};
+
+[NoInterfaceObject]
+interface MOZ_debug {
+    const GLenum EXTENSIONS = 0x1F03;
+    const GLenum WSI_INFO   = 0x10000;
+    const GLenum UNPACK_REQUIRE_FASTPATH = 0x10001;
+
+    [Throws]
+    any getParameter(GLenum pname);
+};
diff --git a/crates/web-sys/webidls/available/WebGPU.webidl b/crates/web-sys/webidls/available/WebGPU.webidl
new file mode 100644
index 00000000..1da99854
--- /dev/null
+++ b/crates/web-sys/webidls/available/WebGPU.webidl
@@ -0,0 +1,639 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://github.com/gpuweb/gpuweb/blob/master/design/sketch.webidl
+ */
+
+typedef unsigned long u32;
+typedef unsigned long long u64;
+
+// ****************************************************************************
+// ERROR HANDLING
+// ****************************************************************************
+
+enum WebGPULogEntryType {
+    "device-lost",
+    "validation-error",
+    "recoverable-out-of-memory",
+};
+
+[Pref="dom.webgpu.enable"]
+interface WebGPULogEntry {
+    readonly attribute WebGPULogEntryType type;
+    readonly attribute any obj;
+    readonly attribute DOMString? reason;
+};
+
+enum WebGPUObjectStatus {
+    "valid",
+    "out-of-memory",
+    "invalid",
+};
+
+typedef (WebGPUBuffer or WebGPUTexture) WebGPUStatusable;
+
+callback WebGPULogCallback = void (WebGPULogEntry error);
+
+// ****************************************************************************
+// SHADER RESOURCES (buffer, textures, texture views, samples)
+// ****************************************************************************
+
+// Buffer
+typedef u32 WebGPUBufferUsageFlags;
+[Pref="dom.webgpu.enable"]
+interface WebGPUBufferUsage {
+    const u32 NONE = 0;
+    const u32 MAP_READ = 1;
+    const u32 MAP_WRITE = 2;
+    const u32 TRANSFER_SRC = 4;
+    const u32 TRANSFER_DST = 8;
+    const u32 INDEX = 16;
+    const u32 VERTEX = 32;
+    const u32 UNIFORM = 64;
+    const u32 STORAGE = 128;
+};
+
+dictionary WebGPUBufferDescriptor {
+    u32 size;
+    WebGPUBufferUsageFlags usage;
+};
+
+[Pref="dom.webgpu.enable"]
+interface WebGPUBuffer {
+    readonly attribute ArrayBuffer? mapping;
+    void unmap();
+};
+
+// Texture view
+dictionary WebGPUTextureViewDescriptor {
+    // TODO Investigate what goes in there.
+};
+
+[Pref="dom.webgpu.enable"]
+interface WebGPUTextureView {
+};
+
+// Texture
+typedef u32 WebGPUTextureDimensionEnum;
+[Pref="dom.webgpu.enable"]
+interface WebGPUTextureDimension {
+    const u32 e1D = 0;
+    const u32 e2D = 1;
+    const u32 e3D = 2;
+    // TODO other dimensions (cube, arrays)
+};
+
+typedef u32 WebGPUTextureFormatEnum;
+[Pref="dom.webgpu.enable"]
+interface WebGPUTextureFormat {
+    const u32 R8_G8_B8_A8_UNORM = 0;
+    const u32 R8_G8_B8_A8_UINT = 1;
+    const u32 B8_G8_R8_A8_UNORM = 2;
+    const u32 D32_FLOAT_S8_UINT = 3;
+    // TODO other formats
+};
+
+typedef u32 WebGPUTextureUsageFlags;
+[Pref="dom.webgpu.enable"]
+interface WebGPUTextureUsage {
+    const u32 NONE = 0;
+    const u32 TRANSFER_SRC = 1;
+    const u32 TRANSFER_DST = 2;
+    const u32 SAMPLED = 4;
+    const u32 STORAGE = 8;
+    const u32 OUTPUT_ATTACHMENT = 16;
+    const u32 PRESENT = 32;
+};
+
+dictionary WebGPUTextureDescriptor {
+    u32 width;
+    u32 height;
+    u32 depth;
+    u32 arraySize;
+    WebGPUTextureDimensionEnum dimension;
+    WebGPUTextureFormatEnum format;
+    WebGPUTextureUsageFlags usage;
+};
+
+[Pref="dom.webgpu.enable"]
+interface WebGPUTexture {
+    WebGPUTextureView createTextureView(optional WebGPUTextureViewDescriptor desc);
+};
+
+// Sampler
+typedef u32 WebGPUFilterModeEnum;
+[Pref="dom.webgpu.enable"]
+interface WebGPUFilterMode {
+    const u32 NEAREST = 0;
+    const u32 LINEAR = 1;
+};
+
+dictionary WebGPUSamplerDescriptor {
+    WebGPUFilterModeEnum magFilter;
+    WebGPUFilterModeEnum minFilter;
+    WebGPUFilterModeEnum mipmapFilter;
+};
+
+[Pref="dom.webgpu.enable"]
+interface WebGPUSampler {
+};
+
+// ****************************************************************************
+// BINDING MODEL (bindgroup layout, bindgroup)
+// ****************************************************************************
+
+// BindGroupLayout
+typedef u32 WebGPUShaderStageFlags;
+[Pref="dom.webgpu.enable"]
+interface WebGPUShaderStageBit {
+    const u32 NONE = 0;
+    const u32 VERTEX = 1;
+    const u32 FRAGMENT = 2;
+    const u32 COMPUTE = 4;
+};
+
+typedef u32 WebGPUBindingTypeEnum;
+[Pref="dom.webgpu.enable"]
+interface WebGPUBindingType {
+    const u32 UNIFORM_BUFFER = 0;
+    const u32 SAMPLER = 1;
+    const u32 SAMPLED_TEXTURE = 2;
+    const u32 STORAGE_BUFFER = 3;
+    // TODO other binding types (storage images, ...)
+};
+
+dictionary WebGPUBindGroupBinding {
+    WebGPUShaderStageFlags visibility;
+    WebGPUBindingTypeEnum type;
+    u32 start;
+    u32 count;
+};
+
+dictionary WebGPUBindGroupLayoutDescriptor {
+    sequence<WebGPUBindGroupBinding> bindingTypes;
+};
+
+[Pref="dom.webgpu.enable"]
+interface WebGPUBindGroupLayout {
+};
+
+// PipelineLayout
+dictionary WebGPUPipelineLayoutDescriptor {
+    sequence<WebGPUBindGroupLayout> bindGroupLayouts;
+};
+
+[Pref="dom.webgpu.enable"]
+interface WebGPUPipelineLayout {
+};
+
+// BindGroup
+/* Moved to WebGPUExtras.webidl for now.
+dictionary WebGPUBufferBinding {
+    WebGPUBuffer buffer;
+    u32 offset;
+    u32 size;
+};
+*/
+
+typedef (WebGPUSampler or WebGPUTextureView or WebGPUBufferBinding) WebGPUBindingResource;
+
+dictionary WebGPUBinding {
+    sequence<WebGPUBindingResource> resources;
+    u32 start;
+    u32 count;
+};
+
+dictionary WebGPUBindGroupDescriptor {
+    WebGPUBindGroupLayout layout;
+    sequence<WebGPUBinding> bindings;
+};
+
+[Pref="dom.webgpu.enable"]
+interface WebGPUBindGroup {
+};
+
+// ****************************************************************************
+// PIPELINE CREATION (blend state, DS state, ..., pipelines)
+// ****************************************************************************
+
+// BlendState
+typedef u32 WebGPUBlendFactorEnum;
+[Pref="dom.webgpu.enable"]
+interface WebGPUBlendFactor {
+    const u32 ZERO = 0;
+    const u32 ONE = 1;
+    const u32 SRC_COLOR = 2;
+    const u32 ONE_MINUS_SRC_COLOR = 3;
+    const u32 SRC_ALPHA = 4;
+    const u32 ONE_MINUS_SRC_ALPHA = 5;
+    const u32 DST_COLOR = 6;
+    const u32 ONE_MINUS_DST_COLOR = 7;
+    const u32 DST_ALPHA = 8;
+    const u32 ONE_MINUS_DST_ALPHA = 9;
+    const u32 SRC_ALPHA_SATURATED = 10;
+    const u32 BLEND_COLOR = 11;
+    const u32 ONE_MINUS_BLEND_COLOR = 12;
+};
+
+typedef u32 WebGPUBlendOperationEnum;
+[Pref="dom.webgpu.enable"]
+interface WebGPUBlendOperation {
+    const u32 ADD = 0;
+    const u32 SUBTRACT = 1;
+    const u32 REVERSE_SUBTRACT = 2;
+    const u32 MIN = 3;
+    const u32 MAX = 4;
+};
+
+typedef u32 WebGPUColorWriteFlags;
+[Pref="dom.webgpu.enable"]
+interface WebGPUColorWriteBits {
+    const u32 NONE = 0;
+    const u32 RED = 1;
+    const u32 GREEN = 2;
+    const u32 BLUE = 4;
+    const u32 ALPHA = 8;
+    const u32 ALL = 15;
+};
+
+dictionary WebGPUBlendDescriptor {
+    WebGPUBlendFactorEnum srcFactor;
+    WebGPUBlendFactorEnum dstFactor;
+    WebGPUBlendOperationEnum operation;
+};
+
+dictionary WebGPUBlendStateDescriptor {
+    boolean blendEnabled;
+    WebGPUBlendDescriptor alpha;
+    WebGPUBlendDescriptor color;
+    WebGPUColorWriteFlags writeMask;
+};
+
+[Pref="dom.webgpu.enable"]
+interface WebGPUBlendState {
+};
+
+// DepthStencilState
+typedef u32 WebGPUCompareFunctionEnum;
+[Pref="dom.webgpu.enable"]
+interface WebGPUCompareFunction {
+    const u32 NEVER = 0;
+    const u32 LESS = 1;
+    const u32 LESS_EQUAL = 2;
+    const u32 GREATER = 3;
+    const u32 GREATER_EQUAL = 4;
+    const u32 EQUAL = 5;
+    const u32 NOT_EQUAL = 6;
+    const u32 ALWAYS = 7;
+};
+
+typedef u32 WebGPUStencilOperationEnum;
+[Pref="dom.webgpu.enable"]
+interface WebGPUStencilOperation {
+    const u32 KEEP = 0;
+    const u32 ZERO = 1;
+    const u32 REPLACE = 2;
+    const u32 INVERT = 3;
+    const u32 INCREMENT_CLAMP = 4;
+    const u32 DECREMENT_CLAMP = 5;
+    const u32 INCREMENT_WRAP = 6;
+    const u32 DECREMENT_WRAP = 7;
+};
+
+dictionary WebGPUStencilStateFaceDescriptor {
+    WebGPUCompareFunctionEnum compare;
+    WebGPUStencilOperationEnum stencilFailOp;
+    WebGPUStencilOperationEnum depthFailOp;
+    WebGPUStencilOperationEnum passOp;
+};
+
+dictionary WebGPUDepthStencilStateDescriptor {
+    boolean depthWriteEnabled;
+    WebGPUCompareFunctionEnum depthCompare;
+
+    WebGPUStencilStateFaceDescriptor front;
+    WebGPUStencilStateFaceDescriptor back;
+
+    u32 stencilReadMask;
+    u32 stencilWriteMask;
+};
+
+[Pref="dom.webgpu.enable"]
+interface WebGPUDepthStencilState {
+};
+
+// InputState
+typedef u32 WebGPUIndexFormatEnum;
+[Pref="dom.webgpu.enable"]
+interface WebGPUIndexFormat {
+    const u32 UINT16 = 0;
+    const u32 UINT32 = 1;
+};
+
+typedef u32 WebGPUVertexFormatEnum;
+[Pref="dom.webgpu.enable"]
+interface WebGPUVertexFormat {
+    const u32 FLOAT_R32_G32_B32_A32 = 0;
+    const u32 FLOAT_R32_G32_B32 = 1;
+    const u32 FLOAT_R32_G32 = 2;
+    const u32 FLOAT_R32 = 3;
+    // TODO other vertex formats
+};
+
+typedef u32 WebGPUInputStepModeEnum;
+[Pref="dom.webgpu.enable"]
+interface WebGPUInputStepMode {
+    const u32 VERTEX = 0;
+    const u32 INSTANCE = 1;
+};
+
+dictionary WebGPUVertexAttributeDescriptor {
+    u32 shaderLocation;
+    u32 inputSlot;
+    u32 offset;
+    WebGPUVertexFormatEnum format;
+};
+
+dictionary WebGPUVertexInputDescriptor {
+    u32 inputSlot;
+    u32 stride;
+    WebGPUInputStepModeEnum stepMode;
+};
+
+dictionary WebGPUInputStateDescriptor {
+    WebGPUIndexFormatEnum indexFormat;
+
+    sequence<WebGPUVertexAttributeDescriptor> attributes;
+    sequence<WebGPUVertexInputDescriptor> inputs;
+};
+
+[Pref="dom.webgpu.enable"]
+interface WebGPUInputState {
+};
+
+// ShaderModule
+dictionary WebGPUShaderModuleDescriptor {
+    required ArrayBuffer code;
+};
+
+[Pref="dom.webgpu.enable"]
+interface WebGPUShaderModule {
+};
+
+// AttachmentState
+dictionary WebGPUAttachmentStateDescriptor {
+    sequence<WebGPUTextureFormatEnum> formats;
+    // TODO other stuff like sample count etc.
+};
+
+[Pref="dom.webgpu.enable"]
+interface WebGPUAttachmentState {
+};
+
+// Common stuff for ComputePipeline and RenderPipeline
+typedef u32 WebGPUShaderStageEnum;
+[Pref="dom.webgpu.enable"]
+interface WebGPUShaderStage {
+    const u32 VERTEX = 0;
+    const u32 FRAGMENT = 1;
+    const u32 COMPUTE = 2;
+};
+
+dictionary WebGPUPipelineStageDescriptor {
+    required WebGPUShaderModule shaderModule;
+    required WebGPUShaderStageEnum stage;
+    required DOMString entryPoint;
+    // TODO other stuff like specialization constants?
+};
+
+dictionary WebGPUPipelineDescriptorBase {
+    required WebGPUPipelineLayout layout;
+    sequence<WebGPUPipelineStageDescriptor> stages;
+};
+
+// ComputePipeline
+dictionary WebGPUComputePipelineDescriptor : WebGPUPipelineDescriptorBase {
+};
+
+[Pref="dom.webgpu.enable"]
+interface WebGPUComputePipeline {
+};
+
+// WebGPURenderPipeline
+typedef u32 WebGPUPrimitiveTopologyEnum;
+[Pref="dom.webgpu.enable"]
+interface WebGPUPrimitiveTopology {
+    const u32 POINT_LIST = 0;
+    const u32 LINE_LIST = 1;
+    const u32 LINE_STRIP = 2;
+    const u32 TRIANGLE_LIST = 3;
+    const u32 TRIANGLE_STRIP = 4;
+};
+
+dictionary WebGPURenderPipelineDescriptor : WebGPUPipelineDescriptorBase {
+    WebGPUPrimitiveTopologyEnum primitiveTopology;
+    sequence<WebGPUBlendState> blendState;
+    WebGPUDepthStencilState depthStencilState;
+    WebGPUInputState inputState;
+    WebGPUAttachmentState attachmentState;
+    // TODO other properties
+};
+
+[Pref="dom.webgpu.enable"]
+interface WebGPURenderPipeline {
+};
+// ****************************************************************************
+// COMMAND RECORDING (Command buffer and all relevant structures)
+// ****************************************************************************
+
+typedef u32 WebGPULoadOpEnum;
+[Pref="dom.webgpu.enable"]
+interface WebGPULoadOp {
+    const u32 CLEAR = 0;
+    const u32 LOAD = 1;
+};
+
+typedef u32 WebGPUStoreOpEnum;
+[Pref="dom.webgpu.enable"]
+interface WebGPUStoreOp {
+    const u32 STORE = 0;
+};
+
+dictionary WebGPURenderPassAttachmentDescriptor {
+    WebGPUTextureView attachment;
+    WebGPULoadOpEnum loadOp;
+    WebGPUStoreOpEnum storeOp;
+};
+
+dictionary WebGPURenderPassDescriptor {
+    sequence<WebGPURenderPassAttachmentDescriptor> colorAttachments;
+    WebGPURenderPassAttachmentDescriptor depthStencilAttachment;
+};
+
+[Pref="dom.webgpu.enable"]
+interface WebGPUCommandBuffer {
+};
+
+dictionary WebGPUCommandEncoderDescriptor {
+};
+
+[Pref="dom.webgpu.enable"]
+interface WebGPUCommandEncoder {
+    WebGPUCommandBuffer finishEncoding();
+
+    // Commands allowed outside of "passes"
+    void copyBufferToBuffer(WebGPUBuffer src,
+                            u32 srcOffset,
+                            WebGPUBuffer dst,
+                            u32 dstOffset,
+                            u32 size);
+    // TODO figure out all the arguments required for these
+    void copyBufferToTexture();
+    void copyTextureToBuffer();
+    void copyTextureToTexture();
+    void blit();
+
+    void transitionBuffer(WebGPUBuffer b, WebGPUBufferUsageFlags f);
+
+    // Allowed in both compute and render passes
+    void setPushConstants(WebGPUShaderStageFlags stage,
+                          u32 offset,
+                          u32 count,
+                          ArrayBuffer data);
+    void setBindGroup(u32 index, WebGPUBindGroup bindGroup);
+    void setPipeline((WebGPUComputePipeline or WebGPURenderPipeline) pipeline);
+
+    // Compute pass commands
+    void beginComputePass();
+    void endComputePass();
+
+    void dispatch(u32 x, u32 y, u32 z);
+
+    // Render pass commands
+    void beginRenderPass(optional WebGPURenderPassDescriptor descriptor);
+    void endRenderPass();
+
+    void setBlendColor(float r, float g, float b, float a);
+    void setIndexBuffer(WebGPUBuffer buffer, u32 offset);
+    void setVertexBuffers(u32 startSlot, sequence<WebGPUBuffer> buffers, sequence<u32> offsets);
+
+    void draw(u32 vertexCount, u32 instanceCount, u32 firstVertex, u32 firstInstance);
+    void drawIndexed(u32 indexCount, u32 instanceCount, u32 firstIndex, u32 firstInstance, u32 firstVertex);
+
+    // TODO add missing commands
+};
+
+// ****************************************************************************
+// OTHER (Fence, Queue SwapChain, Device)
+// ****************************************************************************
+
+// Fence
+[Pref="dom.webgpu.enable"]
+interface WebGPUFence {
+    boolean wait(double milliseconds);
+    readonly attribute Promise<void> promise;
+};
+
+// Queue
+[Pref="dom.webgpu.enable"]
+interface WebGPUQueue {
+    void submit(sequence<WebGPUCommandBuffer> buffers);
+    WebGPUFence insertFence();
+};
+
+// SwapChain / RenderingContext
+dictionary WebGPUSwapChainDescriptor {
+    WebGPUTextureUsageFlags usage;
+    WebGPUTextureFormatEnum format;
+    u32 width;
+    u32 height;
+};
+
+[Pref="dom.webgpu.enable"]
+interface WebGPUSwapChain {
+    void configure(optional WebGPUSwapChainDescriptor descriptor);
+    WebGPUTexture getNextTexture();
+    void present();
+};
+
+//[Pref="dom.webgpu.enable"]
+//interface WebGPURenderingContext : WebGPUSwapChain {
+//};
+
+// WebGPU "namespace" used for device creation
+dictionary WebGPUExtensions {
+    boolean anisotropicFiltering;
+    boolean logicOp; // Previously a "Feature".
+};
+
+dictionary WebGPULimits {
+    u32 maxBindGroups;
+};
+
+// Device
+[Pref="dom.webgpu.enable"]
+interface WebGPUDevice {
+    readonly attribute WebGPUAdapter adapter;
+    WebGPUExtensions extensions();
+    WebGPULimits limits();
+
+    WebGPUBuffer createBuffer(optional WebGPUBufferDescriptor descriptor);
+    WebGPUTexture createTexture(optional WebGPUTextureDescriptor descriptor);
+    WebGPUSampler createSampler(optional WebGPUSamplerDescriptor descriptor);
+
+    WebGPUBindGroupLayout createBindGroupLayout(optional WebGPUBindGroupLayoutDescriptor descriptor);
+    WebGPUPipelineLayout createPipelineLayout(optional WebGPUPipelineLayoutDescriptor descriptor);
+    WebGPUBindGroup createBindGroup(optional WebGPUBindGroupDescriptor descriptor);
+
+    WebGPUBlendState createBlendState(optional WebGPUBlendStateDescriptor descriptor);
+    WebGPUDepthStencilState createDepthStencilState(optional WebGPUDepthStencilStateDescriptor descriptor);
+    WebGPUInputState createInputState(optional WebGPUInputStateDescriptor descriptor);
+    WebGPUShaderModule createShaderModule(WebGPUShaderModuleDescriptor descriptor);
+    WebGPUAttachmentState createAttachmentState(optional WebGPUAttachmentStateDescriptor descriptor);
+    WebGPUComputePipeline createComputePipeline(WebGPUComputePipelineDescriptor descriptor);
+    WebGPURenderPipeline createRenderPipeline(WebGPURenderPipelineDescriptor descriptor);
+
+    WebGPUCommandEncoder createCommandEncoder(optional WebGPUCommandEncoderDescriptor descriptor);
+
+    WebGPUQueue getQueue();
+
+    attribute WebGPULogCallback onLog;
+    Promise<WebGPUObjectStatus> getObjectStatus(WebGPUStatusable obj);
+};
+
+dictionary WebGPUDeviceDescriptor {
+    WebGPUExtensions extensions;
+    //WebGPULimits limits; Don't expose higher limits for now.
+
+    // TODO are other things configurable like queues?
+};
+
+[Pref="dom.webgpu.enable"]
+interface WebGPUAdapter {
+    readonly attribute DOMString name;
+    WebGPUExtensions extensions();
+    //WebGPULimits limits(); Don't expose higher limits for now.
+
+    WebGPUDevice createDevice(optional WebGPUDeviceDescriptor descriptor);
+};
+
+enum WebGPUPowerPreference { "default", "low-power", "high-performance" };
+
+dictionary WebGPUAdapterDescriptor {
+    WebGPUPowerPreference powerPreference;
+};
+
+[Pref="dom.webgpu.enable"]
+interface WebGPU {
+    WebGPUAdapter getAdapter(optional WebGPUAdapterDescriptor desc);
+};
+
+// Add a "webgpu" member to Window that contains the global instance of a "WebGPU"
+[NoInterfaceObject]
+interface WebGPUProvider {
+    [SameObject, Replaceable, Pref="dom.webgpu.enable"] readonly attribute WebGPU webgpu;
+};
+//Window includes WebGPUProvider;
diff --git a/crates/web-sys/webidls/available/WebGPUExtras.webidl b/crates/web-sys/webidls/available/WebGPUExtras.webidl
new file mode 100644
index 00000000..ad38d509
--- /dev/null
+++ b/crates/web-sys/webidls/available/WebGPUExtras.webidl
@@ -0,0 +1,14 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * Some parts of WebGPU.webidl need to be pulled into a different file due to a codegen
+ * bug/missing support.
+ */
+
+dictionary WebGPUBufferBinding {
+    WebGPUBuffer buffer;
+    u32 offset;
+    u32 size;
+};
diff --git a/crates/web-sys/webidls/available/WebKitCSSMatrix.webidl b/crates/web-sys/webidls/available/WebKitCSSMatrix.webidl
new file mode 100644
index 00000000..8115711a
--- /dev/null
+++ b/crates/web-sys/webidls/available/WebKitCSSMatrix.webidl
@@ -0,0 +1,39 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://compat.spec.whatwg.org/#webkitcssmatrix-interface
+ */
+
+[Constructor,
+ Constructor(DOMString transformList),
+ Constructor(WebKitCSSMatrix other),
+ Exposed=Window,
+ Func="mozilla::dom::WebKitCSSMatrix::FeatureEnabled"]
+interface WebKitCSSMatrix : DOMMatrix {
+    // Mutable transform methods
+    [Throws]
+    WebKitCSSMatrix setMatrixValue(DOMString transformList);
+
+    // Immutable transform methods
+    WebKitCSSMatrix multiply(WebKitCSSMatrix other);
+    [Throws]
+    WebKitCSSMatrix inverse();
+    WebKitCSSMatrix translate(optional unrestricted double tx = 0,
+                              optional unrestricted double ty = 0,
+                              optional unrestricted double tz = 0);
+    WebKitCSSMatrix scale(optional unrestricted double scaleX = 1,
+                          optional unrestricted double scaleY,
+                          optional unrestricted double scaleZ = 1);
+    WebKitCSSMatrix rotate(optional unrestricted double rotX = 0,
+                           optional unrestricted double rotY,
+                           optional unrestricted double rotZ);
+    WebKitCSSMatrix rotateAxisAngle(optional unrestricted double x = 0,
+                                    optional unrestricted double y = 0,
+                                    optional unrestricted double z = 0,
+                                    optional unrestricted double angle = 0);
+    WebKitCSSMatrix skewX(optional unrestricted double sx = 0);
+    WebKitCSSMatrix skewY(optional unrestricted double sy = 0);
+};
diff --git a/crates/web-sys/webidls/available/WebSocket.webidl b/crates/web-sys/webidls/available/WebSocket.webidl
new file mode 100644
index 00000000..d656baf7
--- /dev/null
+++ b/crates/web-sys/webidls/available/WebSocket.webidl
@@ -0,0 +1,77 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/html/#network
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and Opera Software ASA.
+ * You are granted a license to use, reproduce and create derivative works of this document.
+ */
+
+enum BinaryType { "blob", "arraybuffer" };
+
+[Exposed=(Window,Worker),
+ Constructor(DOMString url),
+ Constructor(DOMString url, DOMString protocols),
+ Constructor(DOMString url, sequence<DOMString> protocols)]
+interface WebSocket : EventTarget {
+
+  readonly attribute DOMString url;
+
+  // ready state
+  const unsigned short CONNECTING = 0;
+  const unsigned short OPEN = 1;
+  const unsigned short CLOSING = 2;
+  const unsigned short CLOSED = 3;
+
+  readonly attribute unsigned short readyState;
+
+  readonly attribute unsigned long bufferedAmount;
+
+  // networking
+
+  attribute EventHandler onopen;
+
+  attribute EventHandler onerror;
+
+  attribute EventHandler onclose;
+
+  readonly attribute DOMString extensions;
+
+  readonly attribute DOMString protocol;
+
+  [Throws]
+  void close([Clamp] optional unsigned short code, optional DOMString reason);
+
+  // messaging
+
+  attribute EventHandler onmessage;
+
+  attribute BinaryType binaryType;
+
+  [Throws]
+  void send(DOMString data);
+
+  [Throws]
+  void send(Blob data);
+
+  [Throws]
+  void send(ArrayBuffer data);
+
+  [Throws]
+  void send(ArrayBufferView data);
+};
+
+// Support for creating server-side chrome-only WebSocket. Used in
+// devtools remote debugging server.
+interface nsITransportProvider;
+
+partial interface WebSocket {
+  [ChromeOnly, NewObject, Throws]
+  static WebSocket createServerWebSocket(DOMString url,
+                                         sequence<DOMString> protocols,
+                                         nsITransportProvider transportProvider,
+                                         DOMString negotiatedExtensions);
+};
diff --git a/crates/web-sys/webidls/available/WebrtcDeprecated.webidl b/crates/web-sys/webidls/available/WebrtcDeprecated.webidl
new file mode 100644
index 00000000..bd939ba8
--- /dev/null
+++ b/crates/web-sys/webidls/available/WebrtcDeprecated.webidl
@@ -0,0 +1,29 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file includes all the deprecated mozRTC prefixed interfaces.
+ *
+ * The declaration of each should match the declaration of the real, unprefixed
+ * interface.  These aliases will be removed at some point (Bug 1155923).
+ */
+
+[Deprecated="WebrtcDeprecatedPrefix",
+ Pref="media.peerconnection.enabled",
+ JSImplementation="@mozilla.org/dom/rtcicecandidate;1",
+ Constructor(optional RTCIceCandidateInit candidateInitDict)]
+interface mozRTCIceCandidate : RTCIceCandidate {};
+
+[Deprecated="WebrtcDeprecatedPrefix",
+ Pref="media.peerconnection.enabled",
+ JSImplementation="@mozilla.org/dom/peerconnection;1",
+ Constructor (optional RTCConfiguration configuration,
+              optional object? constraints)]
+interface mozRTCPeerConnection : RTCPeerConnection {};
+
+[Deprecated="WebrtcDeprecatedPrefix",
+ Pref="media.peerconnection.enabled",
+ JSImplementation="@mozilla.org/dom/rtcsessiondescription;1",
+ Constructor(optional RTCSessionDescriptionInit descriptionInitDict)]
+interface mozRTCSessionDescription : RTCSessionDescription {};
diff --git a/crates/web-sys/webidls/available/WebrtcGlobalInformation.webidl b/crates/web-sys/webidls/available/WebrtcGlobalInformation.webidl
new file mode 100644
index 00000000..cdda0993
--- /dev/null
+++ b/crates/web-sys/webidls/available/WebrtcGlobalInformation.webidl
@@ -0,0 +1,41 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+dictionary WebrtcGlobalStatisticsReport {
+  sequence<RTCStatsReportInternal> reports;
+};
+
+callback WebrtcGlobalStatisticsCallback = void (WebrtcGlobalStatisticsReport reports);
+callback WebrtcGlobalLoggingCallback = void (sequence<DOMString> logMessages);
+
+[ChromeOnly]
+interface WebrtcGlobalInformation {
+
+  [Throws]
+  static void getAllStats(WebrtcGlobalStatisticsCallback callback,
+                          optional DOMString pcIdFilter);
+
+  static void clearAllStats();
+
+  [Throws]
+  static void getLogging(DOMString pattern,
+                         WebrtcGlobalLoggingCallback callback);
+
+  static void clearLogging();
+
+  // NSPR WebRTC Trace debug level (0 - 65535)
+  //
+  // Notes:
+  // - Setting a non-zero debug level turns on gathering of log for file output.
+  // - Subsequently setting a zero debug level writes that log to disk.
+
+  static attribute long debugLevel;
+
+  // WebRTC AEC debugging enable
+  static attribute boolean aecDebug;
+
+  static readonly attribute DOMString aecDebugLogDir;
+};
diff --git a/crates/web-sys/webidls/available/WheelEvent.webidl b/crates/web-sys/webidls/available/WheelEvent.webidl
new file mode 100644
index 00000000..0c89bc73
--- /dev/null
+++ b/crates/web-sys/webidls/available/WheelEvent.webidl
@@ -0,0 +1,33 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface please see
+ * http://dev.w3.org/2006/webapi/DOM-Level-3-Events/html/DOM3-Events.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Constructor(DOMString type, optional WheelEventInit eventInitDict)]
+interface WheelEvent : MouseEvent
+{
+  const unsigned long DOM_DELTA_PIXEL = 0x00;
+  const unsigned long DOM_DELTA_LINE  = 0x01;
+  const unsigned long DOM_DELTA_PAGE  = 0x02;
+
+  readonly attribute double        deltaX;
+  readonly attribute double        deltaY;
+  readonly attribute double        deltaZ;
+  readonly attribute unsigned long deltaMode;
+
+};
+
+dictionary WheelEventInit : MouseEventInit
+{
+  double deltaX = 0;
+  double deltaY = 0;
+  double deltaZ = 0;
+  unsigned long deltaMode = 0;
+};
diff --git a/crates/web-sys/webidls/available/WidevineCDMManifest.webidl b/crates/web-sys/webidls/available/WidevineCDMManifest.webidl
new file mode 100644
index 00000000..83e14e0b
--- /dev/null
+++ b/crates/web-sys/webidls/available/WidevineCDMManifest.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+dictionary WidevineCDMManifest {
+  required DOMString name;
+  required DOMString description;
+  required DOMString version;
+  required DOMString x-cdm-module-versions;
+  required DOMString x-cdm-interface-versions;
+  required DOMString x-cdm-host-versions;
+  required DOMString x-cdm-codecs;
+};
diff --git a/crates/web-sys/webidls/available/Window.webidl b/crates/web-sys/webidls/available/Window.webidl
new file mode 100644
index 00000000..84fb0781
--- /dev/null
+++ b/crates/web-sys/webidls/available/Window.webidl
@@ -0,0 +1,561 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is:
+ * http://www.whatwg.org/specs/web-apps/current-work/
+ * https://dvcs.w3.org/hg/editing/raw-file/tip/editing.html
+ * https://dvcs.w3.org/hg/IndexedDB/raw-file/tip/Overview.html
+ * http://dev.w3.org/csswg/cssom/
+ * http://dev.w3.org/csswg/cssom-view/
+ * https://dvcs.w3.org/hg/webperf/raw-file/tip/specs/RequestAnimationFrame/Overview.html
+ * https://dvcs.w3.org/hg/webperf/raw-file/tip/specs/NavigationTiming/Overview.html
+ * https://dvcs.w3.org/hg/webcrypto-api/raw-file/tip/spec/Overview.html
+ * http://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
+ * https://w3c.github.io/webappsec-secure-contexts/#monkey-patching-global-object
+ * https://w3c.github.io/requestidlecallback/
+ * https://drafts.css-houdini.org/css-paint-api-1/#dom-window-paintworklet
+ */
+
+interface ApplicationCache;
+interface IID;
+interface nsIBrowserDOMWindow;
+interface XULControllers;
+
+// http://www.whatwg.org/specs/web-apps/current-work/
+[PrimaryGlobal, LegacyUnenumerableNamedProperties, NeedResolve]
+/*sealed*/ interface Window : EventTarget {
+  // the current browsing context
+  [Unforgeable, Constant, StoreInSlot,
+   CrossOriginReadable] readonly attribute Window window;
+  [Replaceable, Constant, StoreInSlot,
+   CrossOriginReadable] readonly attribute Window self;
+  [Unforgeable, StoreInSlot, Pure] readonly attribute Document? document;
+  [Throws] attribute DOMString name;
+  [PutForwards=href, Unforgeable, BinaryName="getLocation",
+   CrossOriginReadable, CrossOriginWritable] readonly attribute Location location;
+  [Throws] readonly attribute History history;
+  [Func="CustomElementRegistry::IsCustomElementEnabled"]
+  readonly attribute CustomElementRegistry customElements;
+  [Replaceable, Throws] readonly attribute BarProp locationbar;
+  [Replaceable, Throws] readonly attribute BarProp menubar;
+  [Replaceable, Throws] readonly attribute BarProp personalbar;
+  [Replaceable, Throws] readonly attribute BarProp scrollbars;
+  [Replaceable, Throws] readonly attribute BarProp statusbar;
+  [Replaceable, Throws] readonly attribute BarProp toolbar;
+  [Throws] attribute DOMString status;
+  [Throws, CrossOriginCallable] void close();
+  [Throws, CrossOriginReadable] readonly attribute boolean closed;
+  [Throws] void stop();
+  [Throws, CrossOriginCallable] void focus();
+  [Throws, CrossOriginCallable] void blur();
+  [Replaceable] readonly attribute any event;
+
+  // other browsing contexts
+  [Replaceable, Throws, CrossOriginReadable] readonly attribute WindowProxy frames;
+  [Replaceable, CrossOriginReadable] readonly attribute unsigned long length;
+  //[Unforgeable, Throws, CrossOriginReadable] readonly attribute WindowProxy top;
+  [Unforgeable, Throws, CrossOriginReadable] readonly attribute WindowProxy? top;
+  [Throws, CrossOriginReadable] attribute any opener;
+  //[Throws] readonly attribute WindowProxy parent;
+  [Replaceable, Throws, CrossOriginReadable] readonly attribute WindowProxy? parent;
+  [Throws, NeedsSubjectPrincipal] readonly attribute Element? frameElement;
+  //[Throws] WindowProxy? open(optional USVString url = "about:blank", optional DOMString target = "_blank", [TreatNullAs=EmptyString] optional DOMString features = "");
+  [Throws] WindowProxy? open(optional DOMString url = "", optional DOMString target = "", [TreatNullAs=EmptyString] optional DOMString features = "");
+  getter object (DOMString name);
+
+  // the user agent
+  readonly attribute Navigator navigator;
+#ifdef HAVE_SIDEBAR
+  [Replaceable, Throws] readonly attribute External external;
+#endif
+  [Throws, Pref="browser.cache.offline.enable", Func="nsGlobalWindowInner::OfflineCacheAllowedForContext"] readonly attribute ApplicationCache applicationCache;
+
+  // user prompts
+  [Throws, NeedsSubjectPrincipal] void alert();
+  [Throws, NeedsSubjectPrincipal] void alert(DOMString message);
+  [Throws, NeedsSubjectPrincipal] boolean confirm(optional DOMString message = "");
+  [Throws, NeedsSubjectPrincipal] DOMString? prompt(optional DOMString message = "", optional DOMString default = "");
+  [Throws, Func="nsGlobalWindowInner::IsWindowPrintEnabled"]
+  void print();
+
+  [Throws, CrossOriginCallable, NeedsSubjectPrincipal]
+  void postMessage(any message, DOMString targetOrigin, optional sequence<object> transfer = []);
+
+  // also has obsolete members
+};
+Window implements GlobalEventHandlers;
+Window implements WindowEventHandlers;
+
+// https://www.w3.org/TR/appmanifest/#onappinstalled-attribute
+partial interface Window {
+  [Pref="dom.manifest.onappinstalled"]
+  attribute EventHandler onappinstalled;
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/
+[NoInterfaceObject]
+interface WindowSessionStorage {
+  //[Throws] readonly attribute Storage sessionStorage;
+  [Throws] readonly attribute Storage? sessionStorage;
+};
+Window implements WindowSessionStorage;
+
+// http://www.whatwg.org/specs/web-apps/current-work/
+[NoInterfaceObject]
+interface WindowLocalStorage {
+  [Throws] readonly attribute Storage? localStorage;
+};
+Window implements WindowLocalStorage;
+
+// http://www.whatwg.org/specs/web-apps/current-work/
+partial interface Window {
+  void captureEvents();
+  void releaseEvents();
+};
+
+// https://dvcs.w3.org/hg/editing/raw-file/tip/editing.html
+partial interface Window {
+  //[Throws] Selection getSelection();
+  [Throws] Selection? getSelection();
+};
+
+// http://dev.w3.org/csswg/cssom/
+partial interface Window {
+  //[NewObject, Throws] CSSStyleDeclaration getComputedStyle(Element elt, optional DOMString pseudoElt = "");
+  [NewObject, Throws] CSSStyleDeclaration? getComputedStyle(Element elt, optional DOMString pseudoElt = "");
+};
+
+// http://dev.w3.org/csswg/cssom-view/
+enum ScrollBehavior { "auto", "instant", "smooth" };
+
+dictionary ScrollOptions {
+  ScrollBehavior behavior = "auto";
+};
+
+dictionary ScrollToOptions : ScrollOptions {
+  unrestricted double left;
+  unrestricted double top;
+};
+
+partial interface Window {
+  //[Throws, NewObject, NeedsCallerType] MediaQueryList matchMedia(DOMString query);
+  [Throws, NewObject, NeedsCallerType] MediaQueryList? matchMedia(DOMString query);
+  // Per spec, screen is SameObject, but we don't actually guarantee that given
+  // nsGlobalWindow::Cleanup.  :(
+  //[SameObject, Replaceable, Throws] readonly attribute Screen screen;
+  [Replaceable, Throws] readonly attribute Screen screen;
+
+  // browsing context
+  //[Throws] void moveTo(double x, double y);
+  //[Throws] void moveBy(double x, double y);
+  //[Throws] void resizeTo(double x, double y);
+  //[Throws] void resizeBy(double x, double y);
+  [Throws, NeedsCallerType] void moveTo(long x, long y);
+  [Throws, NeedsCallerType] void moveBy(long x, long y);
+  [Throws, NeedsCallerType] void resizeTo(long x, long y);
+  [Throws, NeedsCallerType] void resizeBy(long x, long y);
+
+  // viewport
+  // These are writable because we allow chrome to write them.  And they need
+  // to use 'any' as the type, because non-chrome writing them needs to act
+  // like a [Replaceable] attribute would, which needs the original JS value.
+  //[Replaceable, Throws] readonly attribute double innerWidth;
+  //[Replaceable, Throws] readonly attribute double innerHeight;
+  [Throws, NeedsCallerType] attribute any innerWidth;
+  [Throws, NeedsCallerType] attribute any innerHeight;
+
+  // viewport scrolling
+  void scroll(unrestricted double x, unrestricted double y);
+  void scroll(optional ScrollToOptions options);
+  void scrollTo(unrestricted double x, unrestricted double y);
+  void scrollTo(optional ScrollToOptions options);
+  void scrollBy(unrestricted double x, unrestricted double y);
+  void scrollBy(optional ScrollToOptions options);
+  // mozScrollSnap is used by chrome to perform scroll snapping after the
+  // user performs actions that may affect scroll position
+  // mozScrollSnap is deprecated, to be replaced by a web accessible API, such
+  // as an extension to the ScrollOptions dictionary.  See bug 1137937.
+  [ChromeOnly] void mozScrollSnap();
+  // The four properties below are double per spec at the moment, but whether
+  // that will continue is unclear.
+  [Replaceable, Throws] readonly attribute double scrollX;
+  [Replaceable, Throws] readonly attribute double pageXOffset;
+  [Replaceable, Throws] readonly attribute double scrollY;
+  [Replaceable, Throws] readonly attribute double pageYOffset;
+
+  // client
+  // These are writable because we allow chrome to write them.  And they need
+  // to use 'any' as the type, because non-chrome writing them needs to act
+  // like a [Replaceable] attribute would, which needs the original JS value.
+  //[Replaceable, Throws] readonly attribute double screenX;
+  //[Replaceable, Throws] readonly attribute double screenY;
+  //[Replaceable, Throws] readonly attribute double outerWidth;
+  //[Replaceable, Throws] readonly attribute double outerHeight;
+  [Throws, NeedsCallerType] attribute any screenX;
+  [Throws, NeedsCallerType] attribute any screenY;
+  [Throws, NeedsCallerType] attribute any outerWidth;
+  [Throws, NeedsCallerType] attribute any outerHeight;
+};
+
+// https://dvcs.w3.org/hg/webperf/raw-file/tip/specs/RequestAnimationFrame/Overview.html
+partial interface Window {
+  [Throws] long requestAnimationFrame(FrameRequestCallback callback);
+  [Throws] void cancelAnimationFrame(long handle);
+};
+callback FrameRequestCallback = void (DOMHighResTimeStamp time);
+
+// https://dvcs.w3.org/hg/webperf/raw-file/tip/specs/NavigationTiming/Overview.html
+partial interface Window {
+  [Replaceable, Pure, StoreInSlot] readonly attribute Performance? performance;
+};
+
+// https://dvcs.w3.org/hg/webcrypto-api/raw-file/tip/spec/Overview.html
+Window implements GlobalCrypto;
+
+// https://fidoalliance.org/specifications/download/
+Window implements GlobalU2F;
+
+#ifdef MOZ_WEBSPEECH
+// http://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
+[NoInterfaceObject]
+interface SpeechSynthesisGetter {
+  [Throws, Pref="media.webspeech.synth.enabled"] readonly attribute SpeechSynthesis speechSynthesis;
+};
+
+Window implements SpeechSynthesisGetter;
+#endif
+
+// Mozilla-specific stuff
+partial interface Window {
+  //[NewObject, Throws] CSSStyleDeclaration getDefaultComputedStyle(Element elt, optional DOMString pseudoElt = "");
+  [NewObject, Throws] CSSStyleDeclaration? getDefaultComputedStyle(Element elt, optional DOMString pseudoElt = "");
+
+  // Mozilla extensions
+  /**
+   * Method for scrolling this window by a number of lines.
+   */
+  void                      scrollByLines(long numLines, optional ScrollOptions options);
+
+  /**
+   * Method for scrolling this window by a number of pages.
+   */
+  void                      scrollByPages(long numPages, optional ScrollOptions options);
+
+  /**
+   * Method for sizing this window to the content in the window.
+   */
+  [Throws, NeedsCallerType] void sizeToContent();
+
+  // XXX Shouldn't this be in nsIDOMChromeWindow?
+  [ChromeOnly, Replaceable, Throws] readonly attribute XULControllers controllers;
+
+  [ChromeOnly, Throws] readonly attribute Element? realFrameElement;
+
+  [Throws, NeedsCallerType]
+  readonly attribute float mozInnerScreenX;
+  [Throws, NeedsCallerType]
+  readonly attribute float mozInnerScreenY;
+  [Replaceable, Throws, NeedsCallerType]
+  readonly attribute double devicePixelRatio;
+
+  /* The maximum offset that the window can be scrolled to
+     (i.e., the document width/height minus the scrollport width/height) */
+  [ChromeOnly, Throws]  readonly attribute long   scrollMinX;
+  [ChromeOnly, Throws]  readonly attribute long   scrollMinY;
+  [Replaceable, Throws] readonly attribute long   scrollMaxX;
+  [Replaceable, Throws] readonly attribute long   scrollMaxY;
+
+  [Throws] attribute boolean fullScreen;
+
+  [Throws, ChromeOnly] void back();
+  [Throws, ChromeOnly] void forward();
+  [Throws, ChromeOnly, NeedsSubjectPrincipal] void home();
+
+  // XXX Should this be in nsIDOMChromeWindow?
+  void                      updateCommands(DOMString action,
+                                           optional Selection? sel = null,
+                                           optional short reason = 0);
+
+  /* Find in page.
+   * @param str: the search pattern
+   * @param caseSensitive: is the search caseSensitive
+   * @param backwards: should we search backwards
+   * @param wrapAround: should we wrap the search
+   * @param wholeWord: should we search only for whole words
+   * @param searchInFrames: should we search through all frames
+   * @param showDialog: should we show the Find dialog
+   */
+  [Throws] boolean    find(optional DOMString str = "",
+                           optional boolean caseSensitive = false,
+                           optional boolean backwards = false,
+                           optional boolean wrapAround = false,
+                           optional boolean wholeWord = false,
+                           optional boolean searchInFrames = false,
+                           optional boolean showDialog = false);
+
+  /**
+   * Returns the number of times this document for this window has
+   * been painted to the screen.
+   */
+  [Throws] readonly attribute unsigned long long mozPaintCount;
+
+           attribute EventHandler ondevicemotion;
+           attribute EventHandler ondeviceorientation;
+           attribute EventHandler onabsolutedeviceorientation;
+           attribute EventHandler ondeviceproximity;
+           attribute EventHandler onuserproximity;
+           attribute EventHandler ondevicelight;
+
+  void                      dump(DOMString str);
+
+  /**
+   * This method is here for backwards compatibility with 4.x only,
+   * its implementation is a no-op
+   */
+  void                      setResizable(boolean resizable);
+
+  /**
+   * This is the scriptable version of
+   * nsIDOMWindow::openDialog() that takes 3 optional
+   * arguments, plus any additional arguments are passed on as
+   * arguments on the dialog's window object (window.arguments).
+   */
+  [Throws, ChromeOnly] WindowProxy? openDialog(optional DOMString url = "",
+                                               optional DOMString name = "",
+                                               optional DOMString options = "",
+                                               any... extraArguments);
+
+  [
+#ifdef NIGHTLY_BUILD
+   ChromeOnly,
+#endif
+   NonEnumerable, Replaceable, Throws, NeedsCallerType]
+  readonly attribute object? content;
+
+  [Throws, ChromeOnly] any getInterface(IID iid);
+
+  /**
+   * Same as nsIDOMWindow.windowRoot, useful for event listener targeting.
+   */
+  [ChromeOnly, Throws]
+  readonly attribute WindowRoot? windowRoot;
+
+  /**
+   * ChromeOnly method to determine if a particular window should see console
+   * reports from service workers of the given scope.
+   */
+  [ChromeOnly]
+  boolean shouldReportForServiceWorkerScope(USVString aScope);
+
+  /**
+   * InstallTrigger is used for extension installs.  Ideally it would
+   * be something like a WebIDL namespace, but we don't support
+   * JS-implemented static things yet.  See bug 863952.
+   */
+  [Replaceable]
+  readonly attribute InstallTriggerImpl? InstallTrigger;
+};
+
+Window implements TouchEventHandlers;
+
+Window implements OnErrorEventHandlerForWindow;
+
+#if defined(MOZ_WIDGET_ANDROID)
+// https://compat.spec.whatwg.org/#windoworientation-interface
+partial interface Window {
+  [NeedsCallerType]
+  readonly attribute short orientation;
+           attribute EventHandler onorientationchange;
+};
+#endif
+
+#ifdef HAVE_SIDEBAR
+// Mozilla extension
+partial interface Window {
+  [Replaceable, Throws, UseCounter]
+  readonly attribute (External or WindowProxy) sidebar;
+};
+#endif
+
+callback PromiseDocumentFlushedCallback = any ();
+
+// Mozilla extensions for Chrome windows.
+partial interface Window {
+  // The STATE_* constants need to match the corresponding enum in nsGlobalWindow.cpp.
+  [Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  const unsigned short STATE_MAXIMIZED = 1;
+  [Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  const unsigned short STATE_MINIMIZED = 2;
+  [Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  const unsigned short STATE_NORMAL = 3;
+  [Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  const unsigned short STATE_FULLSCREEN = 4;
+
+  [Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  readonly attribute unsigned short windowState;
+
+  [Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  readonly attribute boolean isFullyOccluded;
+
+  /**
+   * browserDOMWindow provides access to yet another layer of
+   * utility functions implemented by chrome script. It will be null
+   * for DOMWindows not corresponding to browsers.
+   */
+  [Throws, Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+           attribute nsIBrowserDOMWindow? browserDOMWindow;
+
+  [Throws, Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  void                      getAttention();
+
+  [Throws, Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  void                      getAttentionWithCycleCount(long aCycleCount);
+
+  [Throws, Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  void                      setCursor(DOMString cursor);
+
+  [Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  void                      maximize();
+  [Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  void                      minimize();
+  [Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  void                      restore();
+
+  /**
+   * Notify a default button is loaded on a dialog or a wizard.
+   * defaultButton is the default button.
+   */
+  [Throws, Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  void notifyDefaultButtonLoaded(Element defaultButton);
+
+  [Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  readonly attribute ChromeMessageBroadcaster messageManager;
+
+  /**
+   * Returns the message manager identified by the given group name that
+   * manages all frame loaders belonging to that group.
+   */
+  [Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  ChromeMessageBroadcaster getGroupMessageManager(DOMString aGroup);
+
+  /**
+   * On some operating systems, we must allow the window manager to
+   * handle window dragging. This function tells the window manager to
+   * start dragging the window. This function will fail unless called
+   * while the left mouse button is held down, callers must check this.
+   *
+   * Throws NS_ERROR_NOT_IMPLEMENTED if the OS doesn't support this.
+   */
+  [Throws, Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  void beginWindowMove(Event mouseDownEvent);
+
+  /**
+   * Calls the given function as soon as a style or layout flush for the
+   * top-level document is not necessary, and returns a Promise which
+   * resolves to the callback's return value after it executes.
+   *
+   * In the event that the window goes away before a flush can occur, the
+   * callback will still be called and the Promise resolved as the window
+   * tears itself down.
+   *
+   * Note that the callback can be called either synchronously or asynchronously
+   * depending on whether or not flushes are pending:
+   *
+   *   The callback will be called synchronously when calling
+   *   promiseDocumentFlushed when NO flushes are already pending. This is
+   *   to ensure that no script has a chance to dirty the DOM before the callback
+   *   is called.
+   *
+   *   The callback will be called asynchronously if a flush is pending.
+   *
+   * The expected execution order is that all pending callbacks will
+   * be fired first (and in the order that they were queued) and then the
+   * Promise resolution handlers will all be invoked later on during the
+   * next microtask checkpoint.
+   *
+   * promiseDocumentFlushed does not support re-entrancy - so calling it from
+   * within a promiseDocumentFlushed callback will result in the inner call
+   * throwing an NS_ERROR_FAILURE exception, and the outer Promise rejecting
+   * with that exception.
+   *
+   * The callback function *must not make any changes which would require
+   * a style or layout flush*.
+   *
+   * Also throws NS_ERROR_FAILURE if the window is not in a state where flushes
+   * can be waited for (for example, the PresShell has not yet been created).
+   *
+   * @param {function} callback
+   * @returns {Promise}
+   */
+  [Throws, Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  Promise<any> promiseDocumentFlushed(PromiseDocumentFlushedCallback callback);
+
+  [Func="IsChromeOrXBL"]
+  readonly attribute boolean isChromeWindow;
+};
+
+partial interface Window {
+  [Pref="dom.vr.enabled"]
+  attribute EventHandler onvrdisplayconnect;
+  [Pref="dom.vr.enabled"]
+  attribute EventHandler onvrdisplaydisconnect;
+  [Pref="dom.vr.enabled"]
+  attribute EventHandler onvrdisplayactivate;
+  [Pref="dom.vr.enabled"]
+  attribute EventHandler onvrdisplaydeactivate;
+  [Pref="dom.vr.enabled"]
+  attribute EventHandler onvrdisplaypresentchange;
+};
+
+// https://drafts.css-houdini.org/css-paint-api-1/#dom-window-paintworklet
+partial interface Window {
+    [Pref="dom.paintWorklet.enabled", Throws]
+    readonly attribute Worklet paintWorklet;
+};
+
+Window implements WindowOrWorkerGlobalScope;
+
+partial interface Window {
+  [Throws, Func="nsGlobalWindowInner::IsRequestIdleCallbackEnabled"]
+  unsigned long requestIdleCallback(IdleRequestCallback callback,
+                                    optional IdleRequestOptions options);
+  [Func="nsGlobalWindowInner::IsRequestIdleCallbackEnabled"]
+  void          cancelIdleCallback(unsigned long handle);
+};
+
+dictionary IdleRequestOptions {
+  unsigned long timeout;
+};
+
+callback IdleRequestCallback = void (IdleDeadline deadline);
+
+partial interface Window {
+  /**
+   * Returns a list of locales that the internationalization components
+   * should be localized to.
+   *
+   * The function name refers to Regional Preferences which can be either
+   * fetched from the internal internationalization database (CLDR), or
+   * from the host environment.
+   *
+   * The result is a sorted list of valid locale IDs and it should be
+   * used for all APIs that accept list of locales, like ECMA402 and L10n APIs.
+   *
+   * This API always returns at least one locale.
+   *
+   * Example: ["en-US", "de", "pl", "sr-Cyrl", "zh-Hans-HK"]
+   */
+  [Func="IsChromeOrXBL"]
+  sequence<DOMString> getRegionalPrefsLocales();
+
+  /**
+   * Getter funcion for IntlUtils, which provides helper functions for
+   * localization.
+   */
+  [Throws, Func="IsChromeOrXBL"]
+  readonly attribute IntlUtils intlUtils;
+};
+
+Window implements WebGPUProvider;
diff --git a/crates/web-sys/webidls/available/WindowOrWorkerGlobalScope.webidl b/crates/web-sys/webidls/available/WindowOrWorkerGlobalScope.webidl
new file mode 100644
index 00000000..81b71979
--- /dev/null
+++ b/crates/web-sys/webidls/available/WindowOrWorkerGlobalScope.webidl
@@ -0,0 +1,82 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is:
+ * https://html.spec.whatwg.org/multipage/webappapis.html#windoworworkerglobalscope-mixin
+ * https://fetch.spec.whatwg.org/#fetch-method
+ * https://w3c.github.io/webappsec-secure-contexts/#monkey-patching-global-object
+ * https://w3c.github.io/ServiceWorker/#self-caches
+ */
+
+// https://html.spec.whatwg.org/multipage/webappapis.html#windoworworkerglobalscope-mixin
+[NoInterfaceObject, Exposed=(Window,Worker)]
+interface WindowOrWorkerGlobalScope {
+  [Replaceable] readonly attribute USVString origin;
+
+  // base64 utility methods
+  [Throws]
+  DOMString btoa(DOMString btoa);
+  [Throws]
+  DOMString atob(DOMString atob);
+
+  // timers
+  // NOTE: We're using overloads where the spec uses a union.  Should
+  // be black-box the same.
+  [Throws]
+  long setTimeout(Function handler, optional long timeout = 0, any... arguments);
+  [Throws]
+  long setTimeout(DOMString handler, optional long timeout = 0, any... unused);
+  void clearTimeout(optional long handle = 0);
+  [Throws]
+  long setInterval(Function handler, optional long timeout = 0, any... arguments);
+  [Throws]
+  long setInterval(DOMString handler, optional long timeout = 0, any... unused);
+  void clearInterval(optional long handle = 0);
+
+  // ImageBitmap
+  [Throws]
+  Promise<ImageBitmap> createImageBitmap(ImageBitmapSource aImage);
+  [Throws]
+  Promise<ImageBitmap> createImageBitmap(ImageBitmapSource aImage, long aSx, long aSy, long aSw, long aSh);
+};
+
+// https://fetch.spec.whatwg.org/#fetch-method
+partial interface WindowOrWorkerGlobalScope {
+  [NewObject, NeedsCallerType]
+  Promise<Response> fetch(RequestInfo input, optional RequestInit init);
+};
+
+// https://w3c.github.io/webappsec-secure-contexts/#monkey-patching-global-object
+partial interface WindowOrWorkerGlobalScope {
+  readonly attribute boolean isSecureContext;
+};
+
+// http://w3c.github.io/IndexedDB/#factory-interface
+partial interface WindowOrWorkerGlobalScope {
+   // readonly attribute IDBFactory indexedDB;
+   [Throws]
+   readonly attribute IDBFactory? indexedDB;
+};
+
+// https://w3c.github.io/ServiceWorker/#self-caches
+partial interface WindowOrWorkerGlobalScope {
+  [Throws, Func="mozilla::dom::DOMPrefs::DOMCachesEnabled", SameObject]
+  readonly attribute CacheStorage caches;
+};
+
+// Mozilla extensions
+partial interface WindowOrWorkerGlobalScope {
+  // Extensions to ImageBitmap bits.
+  // Bug 1141979 - [FoxEye] Extend ImageBitmap with interfaces to access its
+  // underlying image data
+  //
+  // Note:
+  // Overloaded functions cannot have different "extended attributes",
+  // so I cannot add preference on the extended version of createImageBitmap().
+  // To work around, I will then check the preference at run time and throw if
+  // the preference is set to be false.
+  [Throws]
+  Promise<ImageBitmap> createImageBitmap(ImageBitmapSource aImage, long aOffset, long aLength, ImageBitmapFormat aFormat, ImagePixelLayout aLayout);
+};
diff --git a/crates/web-sys/webidls/available/WindowRoot.webidl b/crates/web-sys/webidls/available/WindowRoot.webidl
new file mode 100644
index 00000000..0ddb1a9f
--- /dev/null
+++ b/crates/web-sys/webidls/available/WindowRoot.webidl
@@ -0,0 +1,9 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[ChromeOnly]
+interface WindowRoot : EventTarget {
+};
diff --git a/crates/web-sys/webidls/available/Worker.webidl b/crates/web-sys/webidls/available/Worker.webidl
new file mode 100644
index 00000000..b4ce0500
--- /dev/null
+++ b/crates/web-sys/webidls/available/Worker.webidl
@@ -0,0 +1,39 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://html.spec.whatwg.org/multipage/workers.html
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and Opera
+ * Software ASA.
+ * You are granted a license to use, reproduce and create derivative works of
+ * this document.
+ */
+
+[Constructor(USVString scriptURL, optional WorkerOptions options),
+ Exposed=(Window,DedicatedWorker,SharedWorker,System)]
+interface Worker : EventTarget {
+  void terminate();
+
+  [Throws]
+  void postMessage(any message, optional sequence<object> transfer = []);
+
+  attribute EventHandler onmessage;
+  attribute EventHandler onmessageerror;
+};
+
+Worker implements AbstractWorker;
+
+dictionary WorkerOptions {
+  // WorkerType type = "classic"; TODO: Bug 1247687
+  // RequestCredentials credentials = "omit"; // credentials is only used if type is "module" TODO: Bug 1247687
+  DOMString name = "";
+};
+
+[Constructor(USVString scriptURL),
+ Func="mozilla::dom::ChromeWorker::WorkerAvailable",
+ Exposed=(Window,DedicatedWorker,SharedWorker,System)]
+interface ChromeWorker : Worker {
+};
diff --git a/crates/web-sys/webidls/available/WorkerDebuggerGlobalScope.webidl b/crates/web-sys/webidls/available/WorkerDebuggerGlobalScope.webidl
new file mode 100644
index 00000000..16850589
--- /dev/null
+++ b/crates/web-sys/webidls/available/WorkerDebuggerGlobalScope.webidl
@@ -0,0 +1,40 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+[Global=(WorkerDebugger), Exposed=WorkerDebugger]
+interface WorkerDebuggerGlobalScope : EventTarget {
+  [Throws]
+  readonly attribute object global;
+
+  [Throws]
+  object createSandbox(DOMString name, object prototype);
+
+  [Throws]
+  void loadSubScript(DOMString url, optional object sandbox);
+
+  void enterEventLoop();
+
+  void leaveEventLoop();
+
+  void postMessage(DOMString message);
+
+  attribute EventHandler onmessage;
+
+  [Throws]
+  void setImmediate(Function handler);
+
+  void reportError(DOMString message);
+
+  [Throws]
+  sequence<any> retrieveConsoleEvents();
+
+  [Throws]
+  void setConsoleEventHandler(AnyCallback? handler);
+};
+
+// So you can debug while you debug
+partial interface WorkerDebuggerGlobalScope {
+  void dump(optional DOMString string);
+};
diff --git a/crates/web-sys/webidls/available/WorkerGlobalScope.webidl b/crates/web-sys/webidls/available/WorkerGlobalScope.webidl
new file mode 100644
index 00000000..9b4342ed
--- /dev/null
+++ b/crates/web-sys/webidls/available/WorkerGlobalScope.webidl
@@ -0,0 +1,49 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/multipage/workers.html#the-workerglobalscope-common-interface
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and Opera
+ * Software ASA.
+ * You are granted a license to use, reproduce and create derivative works of
+ * this document.
+ */
+
+[Exposed=(Worker)]
+interface WorkerGlobalScope : EventTarget {
+  [Constant, Cached]
+  readonly attribute WorkerGlobalScope self;
+  readonly attribute WorkerLocation location;
+  readonly attribute WorkerNavigator navigator;
+
+  [Throws]
+  void importScripts(DOMString... urls);
+
+  attribute OnErrorEventHandler onerror;
+
+  attribute EventHandler onoffline;
+  attribute EventHandler ononline;
+  // also has additional members in a partial interface
+};
+
+WorkerGlobalScope implements GlobalCrypto;
+WorkerGlobalScope implements WindowOrWorkerGlobalScope;
+
+// Not implemented yet: bug 1072107.
+// WorkerGlobalScope implements FontFaceSource;
+
+// Mozilla extensions
+partial interface WorkerGlobalScope {
+
+  void dump(optional DOMString str);
+
+  // XXXbz no spec for this yet, because the webperf WG is a bit dysfunctional
+  [Constant, Cached]
+  readonly attribute Performance performance;
+
+  [Func="WorkerGlobalScope::IsInAutomation", Throws]
+  object getJSTestingFunctions();
+};
diff --git a/crates/web-sys/webidls/available/WorkerLocation.webidl b/crates/web-sys/webidls/available/WorkerLocation.webidl
new file mode 100644
index 00000000..23fc478d
--- /dev/null
+++ b/crates/web-sys/webidls/available/WorkerLocation.webidl
@@ -0,0 +1,33 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/html/#worker-locations
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and Opera
+ * Software ASA.
+ * You are granted a license to use, reproduce and create derivative works of
+ * this document.
+ */
+
+[Exposed=Worker]
+interface WorkerLocation {
+  // Bug 824857: no support for stringifier attributes yet.
+  //  stringifier attribute USVString href;
+
+  // Bug 824857 should remove this.
+  stringifier;
+
+  readonly attribute USVString href;
+
+  readonly attribute USVString origin;
+  readonly attribute USVString protocol;
+  readonly attribute USVString host;
+  readonly attribute USVString hostname;
+  readonly attribute USVString port;
+  readonly attribute USVString pathname;
+  readonly attribute USVString search;
+  readonly attribute USVString hash;
+};
diff --git a/crates/web-sys/webidls/available/WorkerNavigator.webidl b/crates/web-sys/webidls/available/WorkerNavigator.webidl
new file mode 100644
index 00000000..a0d2dfdc
--- /dev/null
+++ b/crates/web-sys/webidls/available/WorkerNavigator.webidl
@@ -0,0 +1,28 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+
+[Exposed=Worker]
+interface WorkerNavigator {
+};
+
+WorkerNavigator implements NavigatorID;
+WorkerNavigator implements NavigatorLanguage;
+WorkerNavigator implements NavigatorOnLine;
+WorkerNavigator implements NavigatorConcurrentHardware;
+WorkerNavigator implements NavigatorStorage;
+
+// http://wicg.github.io/netinfo/#extensions-to-the-navigator-interface
+[Exposed=Worker]
+partial interface WorkerNavigator {
+    [Func="mozilla::dom::DOMPrefs::NetworkInformationEnabled", Throws]
+    readonly attribute NetworkInformation connection;
+};
+
+// https://wicg.github.io/media-capabilities/#idl-index
+[Exposed=Worker]
+partial interface WorkerNavigator {
+  [SameObject, Func="mozilla::dom::MediaCapabilities::Enabled"]
+  readonly attribute MediaCapabilities mediaCapabilities;
+};
diff --git a/crates/web-sys/webidls/available/Worklet.webidl b/crates/web-sys/webidls/available/Worklet.webidl
new file mode 100644
index 00000000..c6923fa8
--- /dev/null
+++ b/crates/web-sys/webidls/available/Worklet.webidl
@@ -0,0 +1,14 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.css-houdini.org/worklets/#idl-index
+ */
+
+[Pref="dom.worklet.enabled"]
+interface Worklet {
+  [NewObject, Throws, NeedsCallerType]
+  Promise<void> import(USVString moduleURL);
+};
diff --git a/crates/web-sys/webidls/available/WorkletGlobalScope.webidl b/crates/web-sys/webidls/available/WorkletGlobalScope.webidl
new file mode 100644
index 00000000..c4b684d2
--- /dev/null
+++ b/crates/web-sys/webidls/available/WorkletGlobalScope.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.css-houdini.org/worklets/#idl-index
+ */
+
+[Exposed=Worklet]
+interface WorkletGlobalScope {
+};
+
+// Mozilla extensions
+partial interface WorkletGlobalScope {
+  void dump(optional DOMString str);
+};
diff --git a/crates/web-sys/webidls/available/XMLDocument.webidl b/crates/web-sys/webidls/available/XMLDocument.webidl
new file mode 100644
index 00000000..1db8952a
--- /dev/null
+++ b/crates/web-sys/webidls/available/XMLDocument.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is:
+ * http://dom.spec.whatwg.org/#xmldocument
+ * http://www.whatwg.org/specs/web-apps/current-work/#xmldocument
+ */
+
+// http://dom.spec.whatwg.org/#xmldocument
+interface XMLDocument : Document {};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#xmldocument
+partial interface XMLDocument {
+  [Throws, NeedsCallerType]
+  boolean load(DOMString url);
+};
+
+// Gecko extensions?
+partial interface XMLDocument {
+  [UseCounter]
+  attribute boolean async;
+};
diff --git a/crates/web-sys/webidls/available/XMLHttpRequest.webidl b/crates/web-sys/webidls/available/XMLHttpRequest.webidl
new file mode 100644
index 00000000..2814e577
--- /dev/null
+++ b/crates/web-sys/webidls/available/XMLHttpRequest.webidl
@@ -0,0 +1,145 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://xhr.spec.whatwg.org/#interface-xmlhttprequest
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface InputStream;
+interface MozChannel;
+interface IID;
+
+enum XMLHttpRequestResponseType {
+  "",
+  "arraybuffer",
+  "blob",
+  "document",
+  "json",
+  "text",
+
+  // Mozilla-specific stuff
+  "moz-chunked-arraybuffer",
+};
+
+/**
+ * Parameters for instantiating an XMLHttpRequest. They are passed as an
+ * optional argument to the constructor:
+ *
+ *  new XMLHttpRequest({anon: true, system: true});
+ */
+dictionary MozXMLHttpRequestParameters
+{
+  /**
+   * If true, the request will be sent without cookie and authentication
+   * headers.
+   */
+  boolean mozAnon = false;
+
+  /**
+   * If true, the same origin policy will not be enforced on the request.
+   */
+  boolean mozSystem = false;
+};
+
+[Constructor(optional MozXMLHttpRequestParameters params),
+ // There are apparently callers, specifically CoffeeScript, who do
+ // things like this:
+ //   c = new(window.ActiveXObject || XMLHttpRequest)("Microsoft.XMLHTTP")
+ // To handle that, we need a constructor that takes a string.
+ Constructor(DOMString ignored),
+ Exposed=(Window,DedicatedWorker,SharedWorker)]
+interface XMLHttpRequest : XMLHttpRequestEventTarget {
+  // event handler
+  attribute EventHandler onreadystatechange;
+
+  // states
+  const unsigned short UNSENT = 0;
+  const unsigned short OPENED = 1;
+  const unsigned short HEADERS_RECEIVED = 2;
+  const unsigned short LOADING = 3;
+  const unsigned short DONE = 4;
+
+  readonly attribute unsigned short readyState;
+
+  // request
+  [Throws]
+  void open(ByteString method, USVString url);
+  [Throws]
+  void open(ByteString method, USVString url, boolean async,
+            optional USVString? user=null, optional USVString? password=null);
+  [Throws]
+  void setRequestHeader(ByteString header, ByteString value);
+
+  [SetterThrows]
+  attribute unsigned long timeout;
+
+  [SetterThrows]
+  attribute boolean withCredentials;
+
+  [Throws]
+  readonly attribute XMLHttpRequestUpload upload;
+
+  [Throws]
+  void send(optional (Document or BodyInit)? body = null);
+
+  [Throws]
+  void abort();
+
+  // response
+  readonly attribute USVString responseURL;
+
+  [Throws]
+  readonly attribute unsigned short status;
+
+  [Throws]
+  readonly attribute ByteString statusText;
+
+  [Throws]
+  ByteString? getResponseHeader(ByteString header);
+
+  [Throws]
+  ByteString getAllResponseHeaders();
+
+  [Throws]
+  void overrideMimeType(DOMString mime);
+
+  [SetterThrows]
+  attribute XMLHttpRequestResponseType responseType;
+  [Throws]
+  readonly attribute any response;
+  [Cached, Pure, Throws]
+  readonly attribute USVString? responseText;
+
+  [Throws, Exposed=Window]
+  readonly attribute Document? responseXML;
+
+  // Mozilla-specific stuff
+
+  [ChromeOnly, SetterThrows]
+  attribute boolean mozBackgroundRequest;
+
+  [ChromeOnly, Exposed=Window]
+  readonly attribute MozChannel? channel;
+
+  [Throws, ChromeOnly, Exposed=Window]
+  any getInterface(IID iid);
+
+  [ChromeOnly, Exposed=Window]
+  void setOriginAttributes(optional OriginAttributesDictionary originAttributes);
+
+  [ChromeOnly, Throws]
+  void sendInputStream(InputStream body);
+
+  // Only works on MainThread.
+  // Its permanence is to be evaluated in bug 1368540 for Firefox 60.
+  [ChromeOnly]
+  readonly attribute unsigned short errorCode;
+
+  readonly attribute boolean mozAnon;
+  readonly attribute boolean mozSystem;
+};
diff --git a/crates/web-sys/webidls/available/XMLHttpRequestEventTarget.webidl b/crates/web-sys/webidls/available/XMLHttpRequestEventTarget.webidl
new file mode 100644
index 00000000..035da04c
--- /dev/null
+++ b/crates/web-sys/webidls/available/XMLHttpRequestEventTarget.webidl
@@ -0,0 +1,29 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * www.w3.org/TR/2012/WD-XMLHttpRequest-20120117/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=(Window,DedicatedWorker,SharedWorker)]
+interface XMLHttpRequestEventTarget : EventTarget {
+  // event handlers
+  attribute EventHandler onloadstart;
+
+  attribute EventHandler onprogress;
+
+  attribute EventHandler onabort;
+
+  attribute EventHandler onerror;
+
+  attribute EventHandler onload;
+
+  attribute EventHandler ontimeout;
+
+  attribute EventHandler onloadend;
+};
diff --git a/crates/web-sys/webidls/available/XMLHttpRequestUpload.webidl b/crates/web-sys/webidls/available/XMLHttpRequestUpload.webidl
new file mode 100644
index 00000000..cbb8728b
--- /dev/null
+++ b/crates/web-sys/webidls/available/XMLHttpRequestUpload.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * www.w3.org/TR/2012/WD-XMLHttpRequest-20120117/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=(Window,DedicatedWorker,SharedWorker)]
+interface XMLHttpRequestUpload : XMLHttpRequestEventTarget {
+
+};
diff --git a/crates/web-sys/webidls/available/XMLSerializer.webidl b/crates/web-sys/webidls/available/XMLSerializer.webidl
new file mode 100644
index 00000000..c337ba45
--- /dev/null
+++ b/crates/web-sys/webidls/available/XMLSerializer.webidl
@@ -0,0 +1,38 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://domparsing.spec.whatwg.org/#the-xmlserializer-interface
+ */
+
+interface OutputStream;
+
+[Constructor]
+interface XMLSerializer {
+  /**
+   * The subtree rooted by the specified element is serialized to
+   * a string.
+   *
+   * @param root The root of the subtree to be serialized. This could
+   *             be any node, including a Document.
+   * @returns The serialized subtree in the form of a Unicode string
+   */
+  [Throws]
+  DOMString serializeToString(Node root);
+
+  // Mozilla-specific stuff
+  /**
+   * The subtree rooted by the specified element is serialized to
+   * a byte stream using the character set specified.
+   * @param root The root of the subtree to be serialized. This could
+   *             be any node, including a Document.
+   * @param stream The byte stream to which the subtree is serialized.
+   * @param charset The name of the character set to use for the encoding
+   *                to a byte stream.  If this string is empty and root is
+   *                a document, the document's character set will be used.
+   */
+  [Throws, ChromeOnly]
+  void serializeToStream(Node root, OutputStream stream, DOMString? charset);
+};
+
diff --git a/crates/web-sys/webidls/available/XPathEvaluator.webidl b/crates/web-sys/webidls/available/XPathEvaluator.webidl
new file mode 100644
index 00000000..63604875
--- /dev/null
+++ b/crates/web-sys/webidls/available/XPathEvaluator.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Constructor]
+interface XPathEvaluator {
+  [NewObject, Throws]
+  XPathExpression createExpression(DOMString expression,
+                                   optional XPathNSResolver? resolver = null);
+  [Pure]
+  Node createNSResolver(Node nodeResolver);
+  [Throws]
+  XPathResult evaluate(DOMString expression,
+                       Node contextNode,
+                       optional XPathNSResolver? resolver = null,
+                       optional unsigned short type = 0 /* XPathResult.ANY_TYPE */,
+                       optional object? result = null);
+};
diff --git a/crates/web-sys/webidls/available/XPathExpression.webidl b/crates/web-sys/webidls/available/XPathExpression.webidl
new file mode 100644
index 00000000..90bc603f
--- /dev/null
+++ b/crates/web-sys/webidls/available/XPathExpression.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+interface XPathExpression {
+  // The result specifies a specific result object which may be reused and
+  // returned by this method. If this is specified as null or it's not an
+  // XPathResult object, a new result object will be constructed and returned.
+  [Throws]
+  XPathResult evaluate(Node contextNode,
+                       optional unsigned short type = 0  /* XPathResult.ANY_TYPE */,
+                       optional object? result = null);
+
+  // The result specifies a specific result object which may be reused and
+  // returned by this method. If this is specified as null or it's not an
+  // XPathResult object, a new result object will be constructed and returned.
+  [Throws, ChromeOnly]
+  XPathResult evaluateWithContext(Node contextNode,
+                                  unsigned long contextPosition,
+                                  unsigned long contextSize,
+                                  optional unsigned short type = 0  /* XPathResult.ANY_TYPE */,
+                                  optional object? result = null);
+};
diff --git a/crates/web-sys/webidls/available/XPathNSResolver.webidl b/crates/web-sys/webidls/available/XPathNSResolver.webidl
new file mode 100644
index 00000000..6309ff38
--- /dev/null
+++ b/crates/web-sys/webidls/available/XPathNSResolver.webidl
@@ -0,0 +1,10 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+callback interface XPathNSResolver
+{
+  DOMString? lookupNamespaceURI(DOMString? prefix);
+};
diff --git a/crates/web-sys/webidls/available/XPathResult.webidl b/crates/web-sys/webidls/available/XPathResult.webidl
new file mode 100644
index 00000000..d5006377
--- /dev/null
+++ b/crates/web-sys/webidls/available/XPathResult.webidl
@@ -0,0 +1,38 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * Corresponds to http://www.w3.org/TR/2002/WD-DOM-Level-3-XPath-20020208
+ */
+
+interface XPathResult {
+  // XPathResultType
+  const unsigned short ANY_TYPE = 0;
+  const unsigned short NUMBER_TYPE = 1;
+  const unsigned short STRING_TYPE = 2;
+  const unsigned short BOOLEAN_TYPE = 3;
+  const unsigned short UNORDERED_NODE_ITERATOR_TYPE = 4;
+  const unsigned short ORDERED_NODE_ITERATOR_TYPE = 5;
+  const unsigned short UNORDERED_NODE_SNAPSHOT_TYPE = 6;
+  const unsigned short ORDERED_NODE_SNAPSHOT_TYPE = 7;
+  const unsigned short ANY_UNORDERED_NODE_TYPE = 8;
+  const unsigned short FIRST_ORDERED_NODE_TYPE = 9;
+
+  readonly attribute unsigned short resultType;
+  [Throws]
+  readonly attribute double numberValue;
+  [Throws]
+  readonly attribute DOMString stringValue;
+  [Throws]
+  readonly attribute boolean booleanValue;
+  [Throws]
+  readonly attribute Node? singleNodeValue;
+  readonly attribute boolean invalidIteratorState;
+  [Throws]
+  readonly attribute unsigned long snapshotLength;
+  [Throws]
+  Node? iterateNext();
+  [Throws]
+  Node? snapshotItem(unsigned long index);
+};
diff --git a/crates/web-sys/webidls/available/XSLTProcessor.webidl b/crates/web-sys/webidls/available/XSLTProcessor.webidl
new file mode 100644
index 00000000..278ca94b
--- /dev/null
+++ b/crates/web-sys/webidls/available/XSLTProcessor.webidl
@@ -0,0 +1,109 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+interface nsIVariant;
+
+[Constructor]
+interface XSLTProcessor {
+    /**
+     * Import the stylesheet into this XSLTProcessor for transformations.
+     *
+     * @param style The root-node of a XSLT stylesheet. This can be either
+     *              a document node or an element node. If a document node
+     *              then the document can contain either a XSLT stylesheet
+     *              or a LRE stylesheet.
+     *              If the argument is an element node it must be the
+     *              xsl:stylesheet (or xsl:transform) element of an XSLT
+     *              stylesheet.
+     */
+    [Throws]
+    void importStylesheet(Node style);
+
+    /**
+     * Transforms the node source applying the stylesheet given by
+     * the importStylesheet() function. The owner document of the output node
+     * owns the returned document fragment.
+     *
+     * @param source The node to be transformed
+     * @param output This document is used to generate the output
+     * @return DocumentFragment The result of the transformation
+     */
+    [CEReactions, Throws]
+    DocumentFragment transformToFragment(Node source,
+                                         Document output);
+
+    /**
+     * Transforms the node source applying the stylesheet given by the
+     * importStylesheet() function.
+     *
+     * @param source The node to be transformed
+     * @return Document The result of the transformation
+     */
+    [CEReactions, Throws]
+    Document transformToDocument(Node source);
+
+    /**
+     * Sets a parameter to be used in subsequent transformations with this
+     * XSLTProcessor. If the parameter doesn't exist in the stylesheet the
+     * parameter will be ignored.
+     *
+     * @param namespaceURI The namespaceURI of the XSLT parameter
+     * @param localName    The local name of the XSLT parameter
+     * @param value        The new value of the XSLT parameter
+     */
+    [Throws]
+    void setParameter([TreatNullAs=EmptyString] DOMString namespaceURI,
+                      DOMString localName,
+                      any value);
+
+    /**
+     * Gets a parameter if previously set by setParameter. Returns null
+     * otherwise.
+     *
+     * @param namespaceURI The namespaceURI of the XSLT parameter
+     * @param localName    The local name of the XSLT parameter
+     * @return nsIVariant  The value of the XSLT parameter
+     */
+    [Throws]
+    nsIVariant? getParameter([TreatNullAs=EmptyString] DOMString namespaceURI,
+                             DOMString localName);
+    /**
+     * Removes a parameter, if set. This will make the processor use the
+     * default-value for the parameter as specified in the stylesheet.
+     *
+     * @param namespaceURI The namespaceURI of the XSLT parameter
+     * @param localName    The local name of the XSLT parameter
+     */
+    [Throws]
+    void removeParameter([TreatNullAs=EmptyString] DOMString namespaceURI,
+                         DOMString localName);
+
+    /**
+     * Removes all set parameters from this XSLTProcessor. This will make
+     * the processor use the default-value for all parameters as specified in
+     * the stylesheet.
+     */
+    void clearParameters();
+
+    /**
+     * Remove all parameters and stylesheets from this XSLTProcessor.
+     */
+    void reset();
+
+    /**
+    * Disables all loading of external documents, such as from
+    * <xsl:import> and document()
+    * Defaults to off and is *not* reset by calls to reset()
+    */
+    [ChromeOnly]
+    const unsigned long DISABLE_ALL_LOADS = 1;
+
+    /**
+    * Flags for this processor. Defaults to 0. See individual flags above
+    * for documentation for effect of reset()
+    */
+    [ChromeOnly, NeedsCallerType]
+    attribute unsigned long flags;
+};
diff --git a/crates/web-sys/webidls/enabled/DOMHighResTimeStamp.webidl b/crates/web-sys/webidls/enabled/DOMHighResTimeStamp.webidl
new file mode 100644
index 00000000..bb797c54
--- /dev/null
+++ b/crates/web-sys/webidls/enabled/DOMHighResTimeStamp.webidl
@@ -0,0 +1,13 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://w3c.github.io/hr-time/
+ *
+ * Copyright © 2015 W3C® (MIT, ERCIM, Keio, Beihang).
+ * W3C liability, trademark and document use rules apply.
+ */
+
+typedef double DOMHighResTimeStamp;
diff --git a/crates/web-sys/webidls/enabled/Event.webidl b/crates/web-sys/webidls/enabled/Event.webidl
new file mode 100644
index 00000000..f66e084d
--- /dev/null
+++ b/crates/web-sys/webidls/enabled/Event.webidl
@@ -0,0 +1,90 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/2012/WD-dom-20120105/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Constructor(DOMString type, optional EventInit eventInitDict),
+ Exposed=(Window,Worker,System), ProbablyShortLivingWrapper]
+interface Event {
+  [Pure]
+  readonly attribute DOMString type;
+  [Pure, BindingAlias="srcElement"]
+  readonly attribute EventTarget? target;
+  [Pure]
+  readonly attribute EventTarget? currentTarget;
+
+  sequence<EventTarget> composedPath();
+
+  const unsigned short NONE = 0;
+  const unsigned short CAPTURING_PHASE = 1;
+  const unsigned short AT_TARGET = 2;
+  const unsigned short BUBBLING_PHASE = 3;
+  [Pure]
+  readonly attribute unsigned short eventPhase;
+
+  void stopPropagation();
+  void stopImmediatePropagation();
+
+  [Pure]
+  readonly attribute boolean bubbles;
+  [Pure]
+  readonly attribute boolean cancelable;
+  [NeedsCallerType]
+  void preventDefault();
+  [Pure, NeedsCallerType]
+  readonly attribute boolean defaultPrevented;
+  [ChromeOnly, Pure]
+  readonly attribute boolean defaultPreventedByChrome;
+  [ChromeOnly, Pure]
+  readonly attribute boolean defaultPreventedByContent;
+  [Pure]
+  readonly attribute boolean composed;
+
+  [Unforgeable, Pure]
+  readonly attribute boolean isTrusted;
+  [Pure]
+  readonly attribute DOMHighResTimeStamp timeStamp;
+
+  void initEvent(DOMString type,
+                 optional boolean bubbles = false,
+                 optional boolean cancelable = false);
+  attribute boolean cancelBubble;
+};
+
+// Mozilla specific legacy stuff.
+partial interface Event {
+  const long ALT_MASK     = 0x00000001;
+  const long CONTROL_MASK = 0x00000002;
+  const long SHIFT_MASK   = 0x00000004;
+  const long META_MASK    = 0x00000008;
+
+  /** The original target of the event, before any retargetings. */
+  readonly attribute EventTarget? originalTarget;
+  /**
+   * The explicit original target of the event.  If the event was retargeted
+   * for some reason other than an anonymous boundary crossing, this will be set
+   * to the target before the retargeting occurs.  For example, mouse events
+   * are retargeted to their parent node when they happen over text nodes (bug
+   * 185889), and in that case .target will show the parent and
+   * .explicitOriginalTarget will show the text node.
+   * .explicitOriginalTarget differs from .originalTarget in that it will never
+   * contain anonymous content.
+   */
+  readonly attribute EventTarget? explicitOriginalTarget;
+  [ChromeOnly] readonly attribute EventTarget? composedTarget;
+  [ChromeOnly] readonly attribute boolean multipleActionsPrevented;
+  [ChromeOnly] readonly attribute boolean isSynthesized;
+};
+
+dictionary EventInit {
+  boolean bubbles = false;
+  boolean cancelable = false;
+  boolean composed = false;
+};
diff --git a/crates/web-sys/webidls/enabled/StorageType.webidl b/crates/web-sys/webidls/enabled/StorageType.webidl
new file mode 100644
index 00000000..cb0702d2
--- /dev/null
+++ b/crates/web-sys/webidls/enabled/StorageType.webidl
@@ -0,0 +1,7 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+enum StorageType { "persistent", "temporary", "default" };
diff --git a/crates/webidl/Cargo.toml b/crates/webidl/Cargo.toml
index 98a00e3a..1fdecb60 100644
--- a/crates/webidl/Cargo.toml
+++ b/crates/webidl/Cargo.toml
@@ -7,7 +7,7 @@ authors = ["Nick Fitzgerald <fitzgen@gmail.com>"]
 diff = "0.1.11"
 env_logger = "0.5.10"
 wasm-bindgen = { path = "../..", default-features = false }
-wasm-bindgen-backend = { path = "../backend", features = ["extra-traits"] }
+wasm-bindgen-backend = { version = "=0.2.11", path = "../backend", features = ["extra-traits"] }
 
 [dependencies]
 failure = "0.1"
diff --git a/crates/webidl/src/lib.rs b/crates/webidl/src/lib.rs
index 7b5e24af..12469d15 100644
--- a/crates/webidl/src/lib.rs
+++ b/crates/webidl/src/lib.rs
@@ -20,10 +20,13 @@ extern crate webidl;
 
 mod util;
 
+use std::collections::BTreeSet;
 use std::fs;
 use std::io::{self, Read};
+use std::iter::FromIterator;
 use std::path::Path;
 
+use backend::defined::{ImportedTypeDefinitions, RemoveUndefinedImports};
 use backend::util::{ident_ty, rust_ident, wrap_import_function};
 use failure::ResultExt;
 use quote::ToTokens;
@@ -37,7 +40,7 @@ use util::{
 pub type Result<T> = ::std::result::Result<T, failure::Error>;
 
 /// Parse the WebIDL at the given path into a wasm-bindgen AST.
-pub fn parse_file(webidl_path: &Path) -> Result<backend::ast::Program> {
+fn parse_file(webidl_path: &Path) -> Result<backend::ast::Program> {
     let file = fs::File::open(webidl_path).context("opening WebIDL file")?;
     let mut file = io::BufReader::new(file);
     let mut source = String::new();
@@ -47,7 +50,7 @@ pub fn parse_file(webidl_path: &Path) -> Result<backend::ast::Program> {
 }
 
 /// Parse a string of WebIDL source text into a wasm-bindgen AST.
-pub fn parse(webidl_source: &str) -> Result<backend::ast::Program> {
+fn parse(webidl_source: &str) -> Result<backend::ast::Program> {
     let definitions = webidl::parse_string(webidl_source).context("parsing WebIDL source text")?;
 
     let mut program = backend::ast::Program::default();
@@ -60,17 +63,29 @@ pub fn parse(webidl_source: &str) -> Result<backend::ast::Program> {
 /// `wasm-bindgen` bindings to the things described in the WebIDL.
 pub fn compile_file(webidl_path: &Path) -> Result<String> {
     let ast = parse_file(webidl_path)?;
-    Ok(compile_ast(&ast))
+    Ok(compile_ast(ast))
 }
 
 /// Compile the given WebIDL source text into Rust source text containing
 /// `wasm-bindgen` bindings to the things described in the WebIDL.
 pub fn compile(webidl_source: &str) -> Result<String> {
     let ast = parse(webidl_source)?;
-    Ok(compile_ast(&ast))
+    Ok(compile_ast(ast))
 }
 
-fn compile_ast(ast: &backend::ast::Program) -> String {
+fn compile_ast(mut ast: backend::ast::Program) -> String {
+    let mut defined = BTreeSet::from_iter(
+        vec![
+            "str", "char", "bool", "JsValue", "u8", "i8", "u16", "i16", "u32", "i32", "u64", "i64",
+            "usize", "isize", "f32", "f64",
+        ].into_iter()
+            .map(|id| proc_macro2::Ident::new(id, proc_macro2::Span::call_site())),
+    );
+    ast.imported_type_definitions(&mut |id| {
+        defined.insert(id.clone());
+    });
+    ast.remove_undefined_imports(&|id| defined.contains(id));
+
     let mut tokens = proc_macro2::TokenStream::new();
     ast.to_tokens(&mut tokens);
     tokens.to_string()
@@ -207,6 +222,7 @@ impl<'a> WebidlParse<&'a webidl::ast::NonPartialInterface> for webidl::ast::Exte
                     .map(|arg| (&*arg.name, &*arg.type_, arg.variadic)),
                 Some(self_ty),
                 kind,
+                false,
             ).map(|function| {
                 program.imports.push(backend::ast::Import {
                     module: None,
@@ -305,12 +321,14 @@ impl<'a> WebidlParse<&'a str> for webidl::ast::RegularAttribute {
             return Ok(());
         }
 
-        create_getter(&self.name, &self.type_, self_name, false)
+        let is_structural = util::is_structural(&self.extended_attributes);
+
+        create_getter(&self.name, &self.type_, self_name, false, is_structural)
             .map(wrap_import_function)
             .map(|import| program.imports.push(import));
 
         if !self.read_only {
-            create_setter(&self.name, &self.type_, self_name, false)
+            create_setter(&self.name, &self.type_, self_name, false, is_structural)
                 .map(wrap_import_function)
                 .map(|import| program.imports.push(import));
         }
@@ -325,12 +343,14 @@ impl<'a> WebidlParse<&'a str> for webidl::ast::StaticAttribute {
             return Ok(());
         }
 
-        create_getter(&self.name, &self.type_, self_name, true)
+        let is_structural = util::is_structural(&self.extended_attributes);
+
+        create_getter(&self.name, &self.type_, self_name, true, is_structural)
             .map(wrap_import_function)
             .map(|import| program.imports.push(import));
 
         if !self.read_only {
-            create_setter(&self.name, &self.type_, self_name, true)
+            create_setter(&self.name, &self.type_, self_name, true, is_structural)
                 .map(wrap_import_function)
                 .map(|import| program.imports.push(import));
         }
diff --git a/crates/webidl/src/util.rs b/crates/webidl/src/util.rs
index b79445db..480aba66 100644
--- a/crates/webidl/src/util.rs
+++ b/crates/webidl/src/util.rs
@@ -151,6 +151,7 @@ pub fn create_function<'a, I>(
     arguments: I,
     ret: Option<syn::Type>,
     kind: backend::ast::ImportFunctionKind,
+    structural: bool,
 ) -> Option<backend::ast::ImportFunction>
 where
     I: Iterator<Item = (&'a str, &'a webidl::ast::Type, bool)>,
@@ -184,7 +185,7 @@ where
         rust_name,
         js_ret,
         catch: false,
-        structural: false,
+        structural,
         kind,
         shim,
     })
@@ -233,6 +234,7 @@ pub fn create_basic_method(
             .map(|arg| (&*arg.name, &*arg.type_, arg.variadic)),
         ret,
         kind,
+        false,
     )
 }
 
@@ -241,6 +243,7 @@ pub fn create_getter(
     ty: &webidl::ast::Type,
     self_name: &str,
     is_static: bool,
+    is_structural: bool,
 ) -> Option<backend::ast::ImportFunction> {
     let ret = match webidl_ty_to_syn_ty(ty, TypePosition::Return) {
         None => {
@@ -259,7 +262,7 @@ pub fn create_getter(
         }),
     };
 
-    create_function(name, iter::empty(), ret, kind)
+    create_function(name, iter::empty(), ret, kind, is_structural)
 }
 
 pub fn create_setter(
@@ -267,6 +270,7 @@ pub fn create_setter(
     ty: &webidl::ast::Type,
     self_name: &str,
     is_static: bool,
+    is_structural: bool,
 ) -> Option<backend::ast::ImportFunction> {
     let kind = backend::ast::ImportFunctionKind::Method {
         class: self_name.to_string(),
@@ -282,6 +286,7 @@ pub fn create_setter(
         iter::once((name, ty, false)),
         None,
         kind,
+        is_structural,
     )
 }
 
@@ -289,29 +294,24 @@ pub fn create_setter(
 pub fn is_chrome_only(ext_attrs: &[Box<ExtendedAttribute>]) -> bool {
     ext_attrs.iter().any(|external_attribute| {
         return match &**external_attribute {
-            ExtendedAttribute::ArgumentList(al) => {
-                println!("ArgumentList");
-                al.name == "ChromeOnly"
-            }
-            ExtendedAttribute::Identifier(i) => {
-                println!("Identifier");
-                i.lhs == "ChromeOnly"
-            }
-            ExtendedAttribute::IdentifierList(il) => {
-                println!("IdentifierList");
-                il.lhs == "ChromeOnly"
-            }
-            ExtendedAttribute::NamedArgumentList(nal) => {
-                println!("NamedArgumentList");
-                nal.lhs_name == "ChromeOnly"
-            }
+            ExtendedAttribute::ArgumentList(al) => al.name == "ChromeOnly",
+            ExtendedAttribute::Identifier(i) => i.lhs == "ChromeOnly",
+            ExtendedAttribute::IdentifierList(il) => il.lhs == "ChromeOnly",
+            ExtendedAttribute::NamedArgumentList(nal) => nal.lhs_name == "ChromeOnly",
             ExtendedAttribute::NoArguments(webidl::ast::Other::Identifier(name)) => {
                 name == "ChromeOnly"
             }
-            ExtendedAttribute::NoArguments(_na) => {
-                println!("NoArguments");
-                false
-            }
+            ExtendedAttribute::NoArguments(_na) => false,
         };
     })
 }
+
+pub fn is_structural(attrs: &[Box<ExtendedAttribute>]) -> bool {
+    attrs.iter().any(|attr| {
+        if let ExtendedAttribute::NoArguments(webidl::ast::Other::Identifier(ref name)) = **attr {
+            name == "Unforgeable"
+        } else {
+            false
+        }
+    })
+}
diff --git a/crates/webidl/tests/expected/Event.rs b/crates/webidl/tests/expected/Event.rs
index 5a2f8bba..0a1d6e96 100644
--- a/crates/webidl/tests/expected/Event.rs
+++ b/crates/webidl/tests/expected/Event.rs
@@ -56,56 +56,6 @@ impl From<Event> for ::wasm_bindgen::JsValue {
 #[no_mangle]
 #[allow(non_snake_case)]
 #[doc(hidden)]
-pub extern "C" fn __wbindgen_describe___widl_f_new_Event() {
-    use wasm_bindgen::describe::*;
-    inform(FUNCTION);
-    inform(2u32);
-    <&str as WasmDescribe>::describe();
-    <EventInit as WasmDescribe>::describe();
-    inform(1);
-    <Event as WasmDescribe>::describe();
-}
-impl Event {
-    #[allow(bad_style)]
-    #[cfg(all(target_arch = "wasm32", not(target_os = "emscripten")))]
-    pub fn new(type_: &str, event_init_dict: EventInit) -> Event {
-        ::wasm_bindgen::__rt::link_this_library();
-        #[wasm_import_module = "__wbindgen_placeholder__"]
-        extern "C" {
-            fn __widl_f_new_Event(
-                type_: <&str as ::wasm_bindgen::convert::IntoWasmAbi>::Abi,
-                event_init_dict: <EventInit as ::wasm_bindgen::convert::IntoWasmAbi>::Abi,
-            ) -> <Event as ::wasm_bindgen::convert::FromWasmAbi>::Abi;
-        }
-        unsafe {
-            let _ret = {
-                let mut __stack = ::wasm_bindgen::convert::GlobalStack::new();
-                let type_ =
-                    <&str as ::wasm_bindgen::convert::IntoWasmAbi>::into_abi(type_, &mut __stack);
-                let event_init_dict = <EventInit as ::wasm_bindgen::convert::IntoWasmAbi>::into_abi(
-                    event_init_dict,
-                    &mut __stack,
-                );
-                __widl_f_new_Event(type_, event_init_dict)
-            };
-            <Event as ::wasm_bindgen::convert::FromWasmAbi>::from_abi(
-                _ret,
-                &mut ::wasm_bindgen::convert::GlobalStack::new(),
-            )
-        }
-    }
-    #[allow(bad_style, unused_variables)]
-    #[cfg(not(all(target_arch = "wasm32", not(target_os = "emscripten"))))]
-    pub fn new(type_: &str, event_init_dict: EventInit) -> Event {
-        panic!(
-            "cannot call wasm-bindgen imported functions on \
-             non-wasm targets"
-        );
-    }
-}
-#[no_mangle]
-#[allow(non_snake_case)]
-#[doc(hidden)]
 pub extern "C" fn __wbindgen_describe___widl_f_event_phase_Event() {
     use wasm_bindgen::describe::*;
     inform(FUNCTION);
@@ -490,50 +440,6 @@ impl Event {
 #[no_mangle]
 #[allow(non_snake_case)]
 #[doc(hidden)]
-pub extern "C" fn __wbindgen_describe___widl_f_time_stamp_Event() {
-    use wasm_bindgen::describe::*;
-    inform(FUNCTION);
-    inform(1u32);
-    <&Event as WasmDescribe>::describe();
-    inform(1);
-    <DOMHighResTimeStamp as WasmDescribe>::describe();
-}
-impl Event {
-    #[allow(bad_style)]
-    #[cfg(all(target_arch = "wasm32", not(target_os = "emscripten")))]
-    pub fn time_stamp(&self) -> DOMHighResTimeStamp {
-        ::wasm_bindgen::__rt::link_this_library();
-        #[wasm_import_module = "__wbindgen_placeholder__"]
-        extern "C" {
-            fn __widl_f_time_stamp_Event(
-                self_: <&Event as ::wasm_bindgen::convert::IntoWasmAbi>::Abi,
-            ) -> <DOMHighResTimeStamp as ::wasm_bindgen::convert::FromWasmAbi>::Abi;
-        }
-        unsafe {
-            let _ret = {
-                let mut __stack = ::wasm_bindgen::convert::GlobalStack::new();
-                let self_ =
-                    <&Event as ::wasm_bindgen::convert::IntoWasmAbi>::into_abi(self, &mut __stack);
-                __widl_f_time_stamp_Event(self_)
-            };
-            <DOMHighResTimeStamp as ::wasm_bindgen::convert::FromWasmAbi>::from_abi(
-                _ret,
-                &mut ::wasm_bindgen::convert::GlobalStack::new(),
-            )
-        }
-    }
-    #[allow(bad_style, unused_variables)]
-    #[cfg(not(all(target_arch = "wasm32", not(target_os = "emscripten"))))]
-    pub fn time_stamp(&self) -> DOMHighResTimeStamp {
-        panic!(
-            "cannot call wasm-bindgen imported functions on \
-             non-wasm targets"
-        );
-    }
-}
-#[no_mangle]
-#[allow(non_snake_case)]
-#[doc(hidden)]
 pub extern "C" fn __wbindgen_describe___widl_f_init_event_Event() {
     use wasm_bindgen::describe::*;
     inform(FUNCTION);
@@ -675,10 +581,6 @@ impl Event {
         );
     }
 }
-#[allow(non_camel_case_types)]
-pub type DOMHighResTimeStamp = f64;
-#[allow(non_camel_case_types)]
-pub type EventInit = bool;
 #[allow(non_upper_case_globals)]
 #[wasm_custom_section = "__wasm_bindgen_unstable"]
-const __WASM_BINDGEN_GENERATED_wasm_bindgen_webidl_0_2_11_0 : [ u8 ; 4023usize ] = * b"\xB3\x0F\0\0{\"exports\":[],\"enums\":[],\"imports\":[{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"type\"}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_new_Event\",\"catch\":false,\"method\":{\"class\":\"Event\",\"kind\":\"Constructor\"},\"structural\":false,\"function\":{\"name\":\"new\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_event_phase_Event\",\"catch\":false,\"method\":{\"class\":\"Event\",\"kind\":{\"Operation\":{\"is_static\":false,\"kind\":{\"Getter\":\"eventPhase\"}}}},\"structural\":false,\"function\":{\"name\":\"eventPhase\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_stop_propagation_Event\",\"catch\":false,\"method\":{\"class\":\"Event\",\"kind\":{\"Operation\":{\"is_static\":false,\"kind\":\"Regular\"}}},\"structural\":false,\"function\":{\"name\":\"stopPropagation\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_stop_immediate_propagation_Event\",\"catch\":false,\"method\":{\"class\":\"Event\",\"kind\":{\"Operation\":{\"is_static\":false,\"kind\":\"Regular\"}}},\"structural\":false,\"function\":{\"name\":\"stopImmediatePropagation\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_bubbles_Event\",\"catch\":false,\"method\":{\"class\":\"Event\",\"kind\":{\"Operation\":{\"is_static\":false,\"kind\":{\"Getter\":\"bubbles\"}}}},\"structural\":false,\"function\":{\"name\":\"bubbles\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_cancelable_Event\",\"catch\":false,\"method\":{\"class\":\"Event\",\"kind\":{\"Operation\":{\"is_static\":false,\"kind\":{\"Getter\":\"cancelable\"}}}},\"structural\":false,\"function\":{\"name\":\"cancelable\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_prevent_default_Event\",\"catch\":false,\"method\":{\"class\":\"Event\",\"kind\":{\"Operation\":{\"is_static\":false,\"kind\":\"Regular\"}}},\"structural\":false,\"function\":{\"name\":\"preventDefault\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_default_prevented_Event\",\"catch\":false,\"method\":{\"class\":\"Event\",\"kind\":{\"Operation\":{\"is_static\":false,\"kind\":{\"Getter\":\"defaultPrevented\"}}}},\"structural\":false,\"function\":{\"name\":\"defaultPrevented\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_composed_Event\",\"catch\":false,\"method\":{\"class\":\"Event\",\"kind\":{\"Operation\":{\"is_static\":false,\"kind\":{\"Getter\":\"composed\"}}}},\"structural\":false,\"function\":{\"name\":\"composed\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_is_trusted_Event\",\"catch\":false,\"method\":{\"class\":\"Event\",\"kind\":{\"Operation\":{\"is_static\":false,\"kind\":{\"Getter\":\"isTrusted\"}}}},\"structural\":false,\"function\":{\"name\":\"isTrusted\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_time_stamp_Event\",\"catch\":false,\"method\":{\"class\":\"Event\",\"kind\":{\"Operation\":{\"is_static\":false,\"kind\":{\"Getter\":\"timeStamp\"}}}},\"structural\":false,\"function\":{\"name\":\"timeStamp\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_init_event_Event\",\"catch\":false,\"method\":{\"class\":\"Event\",\"kind\":{\"Operation\":{\"is_static\":false,\"kind\":\"Regular\"}}},\"structural\":false,\"function\":{\"name\":\"initEvent\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_cancel_bubble_Event\",\"catch\":false,\"method\":{\"class\":\"Event\",\"kind\":{\"Operation\":{\"is_static\":false,\"kind\":{\"Getter\":\"cancelBubble\"}}}},\"structural\":false,\"function\":{\"name\":\"cancelBubble\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_set_cancel_bubble_Event\",\"catch\":false,\"method\":{\"class\":\"Event\",\"kind\":{\"Operation\":{\"is_static\":false,\"kind\":{\"Setter\":\"cancelBubble\"}}}},\"structural\":false,\"function\":{\"name\":\"set_cancelBubble\"}}}],\"structs\":[],\"version\":\"0.2.11 (bfec9e640)\",\"schema_version\":\"6\"}" ;
+const __WASM_BINDGEN_GENERATED_wasm_bindgen_webidl_0_2_11_0 : [ u8 ; 3534usize ] = * b"\xCA\r\0\0{\"exports\":[],\"enums\":[],\"imports\":[{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"type\"}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_event_phase_Event\",\"catch\":false,\"method\":{\"class\":\"Event\",\"kind\":{\"Operation\":{\"is_static\":false,\"kind\":{\"Getter\":\"eventPhase\"}}}},\"structural\":false,\"function\":{\"name\":\"eventPhase\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_stop_propagation_Event\",\"catch\":false,\"method\":{\"class\":\"Event\",\"kind\":{\"Operation\":{\"is_static\":false,\"kind\":\"Regular\"}}},\"structural\":false,\"function\":{\"name\":\"stopPropagation\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_stop_immediate_propagation_Event\",\"catch\":false,\"method\":{\"class\":\"Event\",\"kind\":{\"Operation\":{\"is_static\":false,\"kind\":\"Regular\"}}},\"structural\":false,\"function\":{\"name\":\"stopImmediatePropagation\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_bubbles_Event\",\"catch\":false,\"method\":{\"class\":\"Event\",\"kind\":{\"Operation\":{\"is_static\":false,\"kind\":{\"Getter\":\"bubbles\"}}}},\"structural\":false,\"function\":{\"name\":\"bubbles\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_cancelable_Event\",\"catch\":false,\"method\":{\"class\":\"Event\",\"kind\":{\"Operation\":{\"is_static\":false,\"kind\":{\"Getter\":\"cancelable\"}}}},\"structural\":false,\"function\":{\"name\":\"cancelable\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_prevent_default_Event\",\"catch\":false,\"method\":{\"class\":\"Event\",\"kind\":{\"Operation\":{\"is_static\":false,\"kind\":\"Regular\"}}},\"structural\":false,\"function\":{\"name\":\"preventDefault\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_default_prevented_Event\",\"catch\":false,\"method\":{\"class\":\"Event\",\"kind\":{\"Operation\":{\"is_static\":false,\"kind\":{\"Getter\":\"defaultPrevented\"}}}},\"structural\":false,\"function\":{\"name\":\"defaultPrevented\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_composed_Event\",\"catch\":false,\"method\":{\"class\":\"Event\",\"kind\":{\"Operation\":{\"is_static\":false,\"kind\":{\"Getter\":\"composed\"}}}},\"structural\":false,\"function\":{\"name\":\"composed\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_is_trusted_Event\",\"catch\":false,\"method\":{\"class\":\"Event\",\"kind\":{\"Operation\":{\"is_static\":false,\"kind\":{\"Getter\":\"isTrusted\"}}}},\"structural\":false,\"function\":{\"name\":\"isTrusted\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_init_event_Event\",\"catch\":false,\"method\":{\"class\":\"Event\",\"kind\":{\"Operation\":{\"is_static\":false,\"kind\":\"Regular\"}}},\"structural\":false,\"function\":{\"name\":\"initEvent\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_cancel_bubble_Event\",\"catch\":false,\"method\":{\"class\":\"Event\",\"kind\":{\"Operation\":{\"is_static\":false,\"kind\":{\"Getter\":\"cancelBubble\"}}}},\"structural\":false,\"function\":{\"name\":\"cancelBubble\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_set_cancel_bubble_Event\",\"catch\":false,\"method\":{\"class\":\"Event\",\"kind\":{\"Operation\":{\"is_static\":false,\"kind\":{\"Setter\":\"cancelBubble\"}}}},\"structural\":false,\"function\":{\"name\":\"set_cancelBubble\"}}}],\"structs\":[],\"version\":\"0.2.11 (fab125d6e)\",\"schema_version\":\"6\"}" ;
diff --git a/guide/src/SUMMARY.md b/guide/src/SUMMARY.md
index 524d1e40..341e441e 100644
--- a/guide/src/SUMMARY.md
+++ b/guide/src/SUMMARY.md
@@ -25,4 +25,9 @@
     - [Customizing imports](./design/import-customization.md)
     - [Rust Type conversions](./design/rust-type-conversions.md)
     - [Types in `wasm-bindgen`](./design/describe.md)
+  - [`web-sys`](./web-sys.md)
+    - [Overview](./web-sys/overview.md)
+    - [Testing](./web-sys/testing.md)
+    - [Logging](./web-sys/logging.md)
+    - [Supporting More Web APIs](./web-sys/supporting-more-web-apis.md)
   - [Team](./team.md)
diff --git a/guide/src/web-sys.md b/guide/src/web-sys.md
new file mode 100644
index 00000000..4f24534d
--- /dev/null
+++ b/guide/src/web-sys.md
@@ -0,0 +1,8 @@
+# `web-sys`
+
+The `web-sys` crate provides raw bindings to all of the Web's APIs, and its
+source lives at `wasm-bindgen/crates/web-sys`.
+
+The `web-sys` crate is **entirely** mechanically generated inside `build.rs`
+using `wasm-bindgen`'s WebIDL frontend and the WebIDL interface definitions for
+Web APIs.
diff --git a/guide/src/web-sys/logging.md b/guide/src/web-sys/logging.md
new file mode 100644
index 00000000..9ac01ef3
--- /dev/null
+++ b/guide/src/web-sys/logging.md
@@ -0,0 +1,23 @@
+# Logging
+
+The `wasm_bindgen_webidl` crate (used by `web-sys`'s `build.rs`) uses
+[`env_logger`][env_logger] for logging, which can be enabled by setting the
+`RUST_LOG=wasm_bindgen_webidl` environment variable while building the `web-sys`
+crate.
+
+Make sure to enable "very verbose" output during `cargo build` to see these logs
+within `web-sys`'s build script output.
+
+```sh
+cd crates/web-sys
+RUST_LOG=wasm_bindgen_webidl cargo build -vv
+```
+
+If `wasm_bindgen_webidl` encounters WebIDL constructs that it doesn't know how
+to translate into `wasm-bindgen` AST items, it will emit warn-level logs.
+
+```
+WARN 2018-07-06T18:21:49Z: wasm_bindgen_webidl: Unsupported WebIDL interface: ...
+```
+
+[env_logger]: https://crates.io/crates/env_logger
diff --git a/guide/src/web-sys/overview.md b/guide/src/web-sys/overview.md
new file mode 100644
index 00000000..7b80faf1
--- /dev/null
+++ b/guide/src/web-sys/overview.md
@@ -0,0 +1,42 @@
+# `web-sys` Overview
+
+The `web-sys` crate has this file and directory layout:
+
+```text
+.
+├── build.rs
+├── Cargo.toml
+├── README.md
+├── src
+│   └── lib.rs
+└── webidls
+    ├── available
+    │   └── ...
+    └── enabled
+        └── ...
+```
+
+### `webidls/available/*.webidl`
+
+These are all the different WebIDL definitions we intend to support, but don't
+yet. At the time of writing, these are the majority of `.webidl`s.
+
+### `webidls/enabled/*.webidl`
+
+These are the WebIDL interfaces that we will actually generate bindings for (or
+at least bindings for *some* of the things defined in these files).
+
+### `build.rs`
+
+The `build.rs` invokes `wasm-bindgen`'s WebIDL frontend on all the WebIDL files
+in `webidls/enabled`. It writes the resulting bindings into the cargo build's
+out directory.
+
+### `src/lib.rs`
+
+The only thing `src/lib.rs` does is include the bindings generated at compile
+time in `build.rs`. Here is the whole `src/lib.rs` file:
+
+```rust
+{{#include ../../../crates/web-sys/src/lib.rs}}
+```
diff --git a/guide/src/web-sys/supporting-more-web-apis.md b/guide/src/web-sys/supporting-more-web-apis.md
new file mode 100644
index 00000000..5ad344ea
--- /dev/null
+++ b/guide/src/web-sys/supporting-more-web-apis.md
@@ -0,0 +1,59 @@
+# Supporting More Web APIs in `web-sys`
+
+1. <input type="checkbox"/> Ensure that the `.webidl` file describing the
+   interface exists somewhere within the `crates/web-sys/webidls/enabled`
+   directory.
+
+   First, check to see whether we have the WebIDL definition file for
+   your API:
+
+   ```sh
+   grep -rn MyWebApi crates/web-sys/webidls
+   ```
+
+   * If your interface is defined in a `.webidl` file that is inside the
+     `crates/web-sys/webidls/enabled` directory, skip to step (3).
+
+   * If your interface isn't defined in any file yet, find the WebIDL definition
+     in the relevant standard and add it as a new `.webidl` file in
+     `crates/web-sys/webidls/enabled`. Make sure that it is a standard Web API!
+     We don't want to add non-standard APIs to this crate.
+
+   * If your interface is defined in a `.webidl` file within the
+     `crates/web-sys/webidls/available` directory, you need to move it into
+     `crates/web-sys/webidls/enabled`:
+
+     ```sh
+     cd crates/web-sys
+     git mv webidls/available/MyWebApi.webidl webidls/enabled/MyWebApi.webidl
+     ```
+
+2. <input type="checkbox"/> Verify that the `web-sys` crate still builds and
+   that its tests still pass with the new `.webidl` file enabled:
+
+   ```sh
+   cd crates/web-sys
+   cargo build
+   cargo test
+   ```
+
+3. <input type="checkbox"/> Verify that bindings are being generated for your new
+   API by generating the documentation and searching for the new API in it:
+
+   ```sh
+   cd crates/web-sys
+   cargo doc --open
+   # search for the new API in the opened docs
+   ```
+
+   * <input type="checkbox"/> If the new API is **not** showing up in the docs,
+     rebuild the `web-sys` crate [with logging enabled](/web-sys/logging.html)
+     and look for warning messages that mention your new API. Figure out why
+     bindings weren't generated and then add support to `wasm_bindgen_webidl` for
+     whatever is needed to generate your API's bindings.
+
+4. <input type="checkbox"/> Add a simple test for your new API to
+   `crates/web-sys/tests/all/`. See the [`web-sys` testing
+   documentation](/web-sys/testing.html) for details.
+
+5. <input type="checkbox"/> Send a pull request! 😊
diff --git a/guide/src/web-sys/testing.md b/guide/src/web-sys/testing.md
new file mode 100644
index 00000000..fe4c529c
--- /dev/null
+++ b/guide/src/web-sys/testing.md
@@ -0,0 +1,21 @@
+# Testing
+
+You can test the `web-sys` crate by running `cargo test` within the
+`crates/web-sys` directory in the `wasm-bindgen` repository:
+
+```sh
+cd wasm-bindgen/crates/web-sys
+cargo test
+```
+
+These tests all use a headless Firefox browser. See the [*Headless Browser
+Tests* section for details on setup and
+configuration.](../contributing.html#headless-browser-tests)
+
+## Grouping Tests
+
+Because headless tests can have significant setup and tear down overheads, try
+and group tests together. Instead of having a different `#[test]` for every
+method on some interface, have a single `#[test]` for the interface and all of
+its methods. This will keep the test suite running fast, resulting in better
+developer ergonomics and CI turn around times. Thanks!
diff --git a/src/js.rs b/src/js.rs
index 1e078fe3..2175dec4 100644
--- a/src/js.rs
+++ b/src/js.rs
@@ -18,6 +18,9 @@
 
 use wasm_bindgen_macro::*;
 use JsValue;
+
+use core::mem;
+
 if_std! {
     use std::prelude::v1::*;
 }
@@ -83,7 +86,7 @@ extern "C" {
 
     /// The global isFinite() function determines whether the passed value is a finite number.
     /// If  needed, the parameter is first converted to a number.
-    /// 
+    ///
     /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/isFinite
     #[wasm_bindgen(js_name = isFinite)]
     pub fn is_finite(value: &JsValue) -> bool;
@@ -443,6 +446,21 @@ extern "C" {
     pub fn to_string(this: &Function) -> JsString;
 }
 
+impl JsValue {
+    /// Returns the `Function` value of this JS value if it's an instance of a
+    /// function.
+    ///
+    /// If this JS value is not an instance of a function then this returns
+    /// `None`.
+    pub fn as_function(&self) -> Option<&Function> {
+        if self.is_function() {
+            Some(unsafe { mem::transmute(self) })
+        } else {
+            None
+        }
+    }
+}
+
 // Generator
 #[wasm_bindgen]
 extern {
@@ -775,7 +793,7 @@ extern "C" {
     pub type Number;
 
     /// The Number.isFinite() method determines whether the passed value is a finite number.
-    /// 
+    ///
     /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite
     #[wasm_bindgen(static_method_of = Number, js_name = isFinite)]
     pub fn is_finite(value: &JsValue) -> bool;
@@ -788,7 +806,7 @@ extern "C" {
 
     /// The Number.isSafeInteger() method determines whether the provided value is a number
     /// that is a safe integer.
-    /// 
+    ///
     /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isSafeInteger
     #[wasm_bindgen(static_method_of = Number, js_name = isSafeInteger)]
     pub fn is_safe_integer(value: &JsValue) -> bool;
@@ -801,14 +819,14 @@ extern "C" {
     #[wasm_bindgen(constructor)]
     pub fn new(value: JsValue) -> Number;
 
-    /// The Number.parseInt() method parses a string argument and returns an 
+    /// The Number.parseInt() method parses a string argument and returns an
     /// integer of the specified radix or base.
     ///
     /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/parseInt
     #[wasm_bindgen(static_method_of = Number, js_name = parseInt)]
     pub fn parse_int(text: &str, radix: u8) -> Number;
 
-    /// The Number.parseFloat() method parses a string argument and returns a 
+    /// The Number.parseFloat() method parses a string argument and returns a
     /// floating point number.
     ///
     /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/parseFloat
@@ -1213,6 +1231,21 @@ extern "C" {
     pub fn values(object: &Object) -> Array;
 }
 
+impl JsValue {
+    /// Returns the `Object` value of this JS value if it's an instance of an
+    /// object.
+    ///
+    /// If this JS value is not an instance of an object then this returns
+    /// `None`.
+    pub fn as_object(&self) -> Option<&Object> {
+        if self.is_object() {
+            Some(unsafe { mem::transmute(self) })
+        } else {
+            None
+        }
+    }
+}
+
 // Proxy
 #[wasm_bindgen]
 extern {
@@ -1668,6 +1701,21 @@ extern "C" {
     pub fn value_of(this: &JsString) -> JsString;
 }
 
+impl JsValue {
+    /// Returns the `JsString` value of this JS value if it's an instance of a
+    /// string.
+    ///
+    /// If this JS value is not an instance of a string then this returns
+    /// `None`.
+    pub fn as_js_string(&self) -> Option<&JsString> {
+        if self.is_string() {
+            Some(unsafe { mem::transmute(self) })
+        } else {
+            None
+        }
+    }
+}
+
 impl<'a> From<&'a str> for JsString {
     fn from(s: &'a str) -> Self {
         JsString {
@@ -1801,4 +1849,4 @@ extern "C" {
     /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/getCanonicalLocales
     #[wasm_bindgen(static_method_of = Intl, js_name = getCanonicalLocales)]
     pub fn get_canonical_locales(s: &JsValue) -> Array;
-}
\ No newline at end of file
+}
diff --git a/src/lib.rs b/src/lib.rs
index 9387cc40..a43a8d80 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -222,8 +222,17 @@ impl JsValue {
         }
     }
 
-    /// Returns the `String` of this JS value if it's an instance of a
-    /// string and it's valid utf-8.
+    /// Tests whether this JS value is a JS string.
+    pub fn is_string(&self) -> bool {
+        unsafe { __wbindgen_is_string(self.idx) == 1 }
+    }
+
+    /// If this JS value is a string value, this function copies the JS string
+    /// value into wasm linear memory, encoded as UTF-8, and returns it as a
+    /// Rust `String`.
+    ///
+    /// To avoid the copying and re-encoding, consider the `as_js_string()`
+    /// method instead.
     ///
     /// If this JS value is not an instance of a string or if it's not valid
     /// utf-8 then this returns `None`.
@@ -270,6 +279,16 @@ impl JsValue {
     pub fn is_symbol(&self) -> bool {
         unsafe { __wbindgen_is_symbol(self.idx) == 1 }
     }
+
+    /// Tests whether `typeof self == "object" && self !== null`.
+    pub fn is_object(&self) -> bool {
+        unsafe { __wbindgen_is_object(self.idx) == 1 }
+    }
+
+    /// Tests whether the type of this JS value is `function`.
+    pub fn is_function(&self) -> bool {
+        unsafe { __wbindgen_is_function(self.idx) == 1 }
+    }
 }
 
 impl PartialEq for JsValue {
@@ -342,6 +361,9 @@ externs! {
     fn __wbindgen_boolean_get(idx: u32) -> u32;
     fn __wbindgen_symbol_new(ptr: *const u8, len: usize) -> u32;
     fn __wbindgen_is_symbol(idx: u32) -> u32;
+    fn __wbindgen_is_object(idx: u32) -> u32;
+    fn __wbindgen_is_function(idx: u32) -> u32;
+    fn __wbindgen_is_string(idx: u32) -> u32;
     fn __wbindgen_string_get(idx: u32, len: *mut usize) -> *mut u8;
     fn __wbindgen_throw(a: *const u8, b: usize) -> !;
 
@@ -367,25 +389,25 @@ impl Clone for JsValue {
 impl fmt::Debug for JsValue {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         if let Some(n) = self.as_f64() {
-            return n.fmt(f)
+            return n.fmt(f);
         }
         #[cfg(feature = "std")]
         {
             if let Some(n) = self.as_string() {
-                return n.fmt(f)
+                return n.fmt(f);
             }
         }
         if let Some(n) = self.as_bool() {
-            return n.fmt(f)
+            return n.fmt(f);
         }
         if self.is_null() {
-            return fmt::Display::fmt("null", f)
+            return fmt::Display::fmt("null", f);
         }
         if self.is_undefined() {
-            return fmt::Display::fmt("undefined", f)
+            return fmt::Display::fmt("undefined", f);
         }
         if self.is_symbol() {
-            return fmt::Display::fmt("Symbol(..)", f)
+            return fmt::Display::fmt("Symbol(..)", f);
         }
         fmt::Display::fmt("[object]", f)
     }
diff --git a/tests/all/js_globals/ArrayIterator.rs b/tests/all/js_globals/ArrayIterator.rs
old mode 100644
new mode 100755
index 6e7d96e3..6df1fb65
--- a/tests/all/js_globals/ArrayIterator.rs
+++ b/tests/all/js_globals/ArrayIterator.rs
@@ -82,9 +82,8 @@ fn entries() {
 
 #[test]
 fn values() {
-    project()
-        .headless(true) // Node.js does not have values()
-        .file(
+    let mut project = project();
+    project.file(
             "src/lib.rs",
             r#"
             #![feature(proc_macro, wasm_custom_section)]
@@ -106,6 +105,10 @@ fn values() {
             import * as wasm from "./out";
 
             export function test() {
+                if (typeof Array.prototype.values !== "function") {
+                    return;
+                }
+
                 let numbers = [8, 3, 2];
                 let wasmIterator = wasm.get_values(numbers);
 
@@ -115,6 +118,11 @@ fn values() {
                 assert.ok(wasmIterator.next().done);
             }
         "#,
-        )
-        .test()
+        );
+
+    let mut headless = project.clone();
+    headless.headless(true);
+
+    project.test();
+    headless.test();
 }
diff --git a/tests/all/simple.rs b/tests/all/simple.rs
index 95b5a70c..dfc772fb 100644
--- a/tests/all/simple.rs
+++ b/tests/all/simple.rs
@@ -368,3 +368,94 @@ fn no_std_class() {
         )
         .test();
 }
+
+#[test]
+fn jsvalue_typeof() {
+    project()
+        .file(
+            "src/lib.rs",
+            r#"
+                #![feature(proc_macro, wasm_custom_section, wasm_import_module)]
+                extern crate wasm_bindgen;
+                use wasm_bindgen::prelude::*;
+
+                #[wasm_bindgen]
+                pub fn is_object(val: &JsValue) -> bool {
+                    val.is_object()
+                }
+
+                #[wasm_bindgen]
+                pub fn is_function(val: &JsValue) -> bool {
+                    val.is_function()
+                }
+
+                #[wasm_bindgen]
+                pub fn is_string(val: &JsValue) -> bool {
+                    val.is_string()
+                }
+            "#,
+        )
+        .file(
+            "test.js",
+            r#"
+                import * as assert from "assert";
+                import * as wasm from "./out";
+
+                export function test() {
+                    assert.ok(wasm.is_object({}));
+                    assert.ok(!wasm.is_object(42));
+                    assert.ok(wasm.is_function(function() {}));
+                    assert.ok(!wasm.is_function(42));
+                    assert.ok(wasm.is_string("2b or !2b"));
+                    assert.ok(!wasm.is_string(42));
+                }
+            "#,
+        )
+        .test();
+}
+
+#[test]
+fn binding_to_unimplemented_apis_doesnt_break_everything() {
+    project()
+        .file(
+            "src/lib.rs",
+            r#"
+                #![feature(proc_macro, wasm_custom_section, wasm_import_module)]
+                extern crate wasm_bindgen;
+                use wasm_bindgen::prelude::*;
+                use wasm_bindgen::js::*;
+
+                #[wasm_bindgen]
+                extern {
+                    #[derive(Clone)]
+                    type Array;
+
+                    #[wasm_bindgen(constructor)]
+                    fn new() -> Array;
+
+                    #[wasm_bindgen(method)]
+                    fn standardized_method_this_js_runtime_doesnt_implement_yet(this: &Array);
+                }
+
+                #[wasm_bindgen]
+                pub fn test() {
+                    let array = Array::new();
+
+                    let array_obj: JsValue = array.clone().into();
+                    let array_obj = array_obj.as_object().unwrap();
+
+                    let array_proto = Reflect::get_prototype_of(&array_obj);
+
+                    let unimplemented = Reflect::get(
+                        &array_proto,
+                        &JsValue::from_str("standardized_method_this_js_runtime_doesnt_implement_yet")
+                    );
+
+                    if unimplemented.is_function() {
+                        array.standardized_method_this_js_runtime_doesnt_implement_yet();
+                    }
+                }
+            "#,
+        )
+        .test();
+}
diff --git a/tests/all/webidl/simple.rs b/tests/all/webidl/simple.rs
index 2fa500d2..72637533 100644
--- a/tests/all/webidl/simple.rs
+++ b/tests/all/webidl/simple.rs
@@ -281,3 +281,92 @@ fn static_property() {
         )
         .test();
 }
+
+#[test]
+fn one_method_using_an_undefined_import_doesnt_break_all_other_methods() {
+    project()
+        .file(
+            "foo.webidl",
+            r#"
+                [Constructor()]
+                interface Foo {
+                    boolean ok_method();
+                    boolean bad_method(UndefinedType undef);
+                };
+            "#,
+        )
+        .file(
+            "foo.js",
+            r#"
+                export class Foo {
+                    constructor() {}
+                    ok_method() {
+                        return true;
+                    }
+                }
+            "#,
+        )
+        .file(
+            "src/lib.rs",
+            r#"
+                #![feature(proc_macro, wasm_custom_section, wasm_import_module)]
+                extern crate wasm_bindgen;
+                use wasm_bindgen::prelude::*;
+
+                pub mod foo;
+
+                #[wasm_bindgen]
+                pub fn test() {
+                    let f = foo::Foo::new();
+                    assert!(f.ok_method());
+                }
+            "#,
+        )
+        .test();
+}
+
+#[test]
+fn unforgeable_is_structural() {
+    project()
+        .file(
+            "foo.webidl",
+            r#"
+                [Constructor()]
+                interface Foo {
+                    [Unforgeable] readonly attribute short uno;
+                                  readonly attribute short dos;
+                };
+            "#,
+        )
+        .file(
+            "foo.js",
+            r#"
+                export class Foo {
+                    constructor() {
+                        this.uno = 1;
+                    }
+                    get dos() {
+                        return 2;
+                    }
+                }
+            "#,
+        )
+        .file(
+            "src/lib.rs",
+            r#"
+                #![feature(proc_macro, wasm_custom_section, wasm_import_module)]
+                extern crate wasm_bindgen;
+                use wasm_bindgen::prelude::*;
+
+                pub mod foo;
+
+                #[wasm_bindgen]
+                pub fn test() {
+                    let f = foo::Foo::new();
+                    assert_eq!(f.uno(), 1);
+                    assert_eq!(f.dos(), 2);
+                }
+            "#,
+        )
+        .test();
+}