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/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;
+};