Try to enable all webidls (#573)

* Try to enable all webidls

* Separate out unavailable webidl files by reason.

* Create record of fully tested WebIDL files

* Update notes to reflect new situation with web-idl

* Make a blank ident fail, disable the necessary widls.

It turns out that all the blank idents came from blank enum variants,
which is allowed in webidl apparently.

crates/web-sys/webidls/enabled/XMLSerializer.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/.
+ *
+ * The origin of this IDL file is
+ * http://domparsing.spec.whatwg.org/#the-xmlserializer-interface
+ */
+
+// invalid widl
+// 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);
+};
+