Document the tracking bugs of some straight-forward IDL bugs

Source/core/html/HTMLDocument.idl

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 10 matching lines @@
 // FIXME: "For historical reasons, Window objects must also have a
 // writable, configurable, non-enumerable property named HTMLDocument
 // whose value is the Document interface object."
 // https://html.spec.whatwg.org/#the-window-object
 
 interface HTMLDocument : Document {
     // FIXME: This shadows the compatMode on the Document interface.
     readonly attribute DOMString compatMode;
 
     // https://html.spec.whatwg.org/#the-document-object
+    // TODO(philipj): The below should be moved to Document. crbug.com/496376
 
     // dynamic markup insertion
     // FIXME: There are two open() methods in the spec.
     [Custom, CustomElementCallbacks] void open();
     [RaisesException] void close();
     [CallWith=ActiveWindow, CustomElementCallbacks, RaisesException] void write(DOMString... text);
     [CallWith=ActiveWindow, CustomElementCallbacks, RaisesException] void writeln(DOMString... text);
 
     // https://html.spec.whatwg.org/#Document-partial
 
     // FIXME: *Color should have [TreatNullAs=EmptyString].
     [TreatNullAs=NullString, CustomElementCallbacks] attribute DOMString fgColor;
     [TreatNullAs=NullString, CustomElementCallbacks] attribute DOMString linkColor;
     [TreatNullAs=NullString, CustomElementCallbacks] attribute DOMString vlinkColor;
     [TreatNullAs=NullString, CustomElementCallbacks] attribute DOMString alinkColor;
     [TreatNullAs=NullString, CustomElementCallbacks] attribute DOMString bgColor;
 
     [MeasureAs=DocumentClear] void clear();
     [MeasureAs=DocumentCaptureEvents] void captureEvents();
     [MeasureAs=DocumentReleaseEvents] void releaseEvents();
 
     // FIXME: all should not be [Replaceable].
     [Replaceable, ImplementedAs=allForBinding] readonly attribute HTMLAllCollection all;
 };