Have getElementsByClassName() / getElementsByTagName*() return an HTMLCollection

Source/core/dom/Document.idl

 /*
  * Copyright (C) 2006, 2007, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006, 2007 Samuel Weinig <sam@webkit.org>
  *
  * 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 18 matching lines @@
     readonly attribute DOMImplementation implementation;
     readonly attribute Element documentElement;
 
     [CustomElementCallbacks, PerWorldBindings, ActivityLogging=ForIsolatedWorlds, RaisesException] Element createElement(DOMString tagName);
     DocumentFragment createDocumentFragment();
     [PerWorldBindings] Text createTextNode(DOMString data);
     Comment createComment(DOMString data);
     [RaisesException, MeasureAs=DocumentCreateCDATASection] CDATASection createCDATASection([Default=Undefined] optional DOMString data); // Removed from DOM4.
     [RaisesException] ProcessingInstruction createProcessingInstruction(DOMString target, DOMString data);
     [RaisesException, MeasureAs=DocumentCreateAttribute] Attr createAttribute([Default=Undefined] optional DOMString name); // Removed from DOM4.
-    [PerWorldBindings] NodeList getElementsByTagName(DOMString localName);
+    [PerWorldBindings] HTMLCollection getElementsByTagName(DOMString localName);
 
     // Introduced in DOM Level 2:
 
     [CustomElementCallbacks, PerWorldBindings, ActivityLogging=ForIsolatedWorlds, RaisesException] Node importNode(Node node, optional boolean deep);
     [CustomElementCallbacks, PerWorldBindings, ActivityLogging=ForIsolatedWorlds, RaisesException] Element createElementNS([TreatNullAs=NullString] DOMString namespaceURI, DOMString qualifiedName);
     [RaisesException, MeasureAs=DocumentCreateAttributeNS] Attr createAttributeNS([TreatNullAs=NullString,Default=Undefined] optional DOMString namespaceURI,
                                                                                   [TreatNullAs=NullString,Default=Undefined] optional DOMString qualifiedName); // Removed from DOM4.
-    NodeList getElementsByTagNameNS([TreatNullAs=NullString] DOMString namespaceURI, DOMString localName);
+    HTMLCollection getElementsByTagNameNS([TreatNullAs=NullString] DOMString namespaceURI, DOMString localName);
     [PerWorldBindings] Element getElementById(DOMString elementId);
 
     // DOM Level 3 Core
 
     [TreatReturnedNullStringAs=Null, MeasureAs=DocumentInputEncoding] readonly attribute DOMString inputEncoding; // Removed from DOM4.
 
     [TreatReturnedNullStringAs=Null, MeasureAs=DocumentXMLEncoding] readonly attribute DOMString xmlEncoding; // Removed from DOM4.
     [TreatReturnedNullStringAs=Null, TreatNullAs=NullString, RaisesException=Setter, MeasureAs=DocumentXMLVersion] attribute DOMString xmlVersion; // Removed from DOM4.
     [RaisesException=Setter, MeasureAs=DocumentXMLStandalone] attribute boolean xmlStandalone; // Removed from DOM4.
 
@@ skipping 81 matching lines @@
     [TreatReturnedNullStringAs=Null] readonly attribute DOMString characterSet;
 
     // WebKit extensions
 
     [TreatReturnedNullStringAs=Null] readonly attribute DOMString preferredStylesheetSet;
              [TreatReturnedNullStringAs=Null, TreatNullAs=NullString] attribute DOMString selectedStylesheetSet;
 
     CanvasRenderingContext getCSSCanvasContext(DOMString contextId, DOMString name, long width, long height);
 
     // HTML 5
-    NodeList getElementsByClassName(DOMString classNames);
+    HTMLCollection getElementsByClassName(DOMString classNames);
     readonly attribute Element activeElement;
     boolean hasFocus();
 
     readonly attribute DOMString compatMode;
 
     // NodeSelector - Selector API
     [RaisesException] Element querySelector(DOMString selectors);
     [RaisesException] NodeList querySelectorAll(DOMString selectors);
 
     void webkitExitPointerLock();
@@ skipping 50 matching lines @@
     // document in the console. It's possible http://crbug.com/43394 will resolve this.
     [MeasureAs=PrefixedPageVisibility, ImplementedAs=visibilityState] readonly attribute DOMString webkitVisibilityState;
     [MeasureAs=PrefixedPageVisibility, ImplementedAs=hidden] readonly attribute boolean webkitHidden;
 
     readonly attribute HTMLScriptElement currentScript;
 };
 
 Document implements GlobalEventHandlers;
 Document implements ParentNode;