Implement Custom Elements' attributeChangedCallback.

Source/core/dom/Element.idl

 /*
  * Copyright (C) 2006, 2007, 2009 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,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 [
     CustomToV8
 ] interface Element : Node {
 
     // DOM Level 1 Core
 
     [TreatReturnedNullStringAs=Null, PerWorldBindings] readonly attribute DOMString tagName;
 
     [TreatReturnedNullStringAs=Null] DOMString getAttribute([Default=Undefined] optional DOMString name);
-    [RaisesException] void setAttribute([Default=Undefined] optional DOMString name,
+    [RaisesException, DeliverCustomElementCallbacks] void setAttribute([Default=Undefined] optional DOMString name,
                                      [Default=Undefined] optional DOMString value);
-    void removeAttribute([Default=Undefined] optional DOMString name);
+    [DeliverCustomElementCallbacks] void removeAttribute([Default=Undefined] optional DOMString name);
     Attr getAttributeNode([Default=Undefined] optional DOMString name);
-    [RaisesException] Attr setAttributeNode([Default=Undefined, StrictTypeChecking] optional Attr newAttr);
-    [RaisesException] Attr removeAttributeNode([Default=Undefined, StrictTypeChecking] optional Attr oldAttr);
+    [RaisesException, DeliverCustomElementCallbacks] Attr setAttributeNode([Default=Undefined, StrictTypeChecking] optional Attr newAttr);
+    [RaisesException, DeliverCustomElementCallbacks] Attr removeAttributeNode([Default=Undefined, StrictTypeChecking] optional Attr oldAttr);
     [PerWorldBindings] NodeList getElementsByTagName([Default=Undefined] optional DOMString name);
 
     // For ObjC this is defined on Node for legacy support.
     [PerWorldBindings] readonly attribute NamedNodeMap     attributes;
     boolean            hasAttributes();
 
     // DOM Level 2 Core
 
      DOMString getAttributeNS([TreatNullAs=NullString,Default=Undefined] optional DOMString namespaceURI,
                                             [Default=Undefined] optional DOMString localName);
-     [RaisesException] void setAttributeNS([TreatNullAs=NullString,Default=Undefined] optional DOMString namespaceURI,
+     [RaisesException, DeliverCustomElementCallbacks] void setAttributeNS([TreatNullAs=NullString,Default=Undefined] optional DOMString namespaceURI,
                                        [Default=Undefined] optional DOMString qualifiedName,
                                        [Default=Undefined] optional DOMString value);
-     void removeAttributeNS([TreatNullAs=NullString] DOMString namespaceURI,
+     [DeliverCustomElementCallbacks] void removeAttributeNS([TreatNullAs=NullString] DOMString namespaceURI,
                                           DOMString localName);
      NodeList getElementsByTagNameNS([TreatNullAs=NullString,Default=Undefined] optional DOMString namespaceURI,
                                                    [Default=Undefined] optional DOMString localName);
      Attr getAttributeNodeNS([TreatNullAs=NullString,Default=Undefined] optional DOMString namespaceURI,
                                            [Default=Undefined] optional DOMString localName);
     [RaisesException] Attr setAttributeNodeNS([Default=Undefined, StrictTypeChecking] optional Attr newAttr);
     boolean hasAttribute(DOMString name);
      boolean hasAttributeNS([TreatNullAs=NullString,Default=Undefined] optional DOMString namespaceURI,
                                           [Default=Undefined] optional DOMString localName);
 
@@ skipping 131 matching lines @@
     [NotEnumerable, EnabledAtRuntime=touch, PerWorldBindings] attribute EventListener ontouchmove;
     [NotEnumerable, EnabledAtRuntime=touch, PerWorldBindings] attribute EventListener ontouchend;
     [NotEnumerable, EnabledAtRuntime=touch, PerWorldBindings] attribute EventListener ontouchcancel;
     [NotEnumerable, PerWorldBindings] attribute EventListener onwebkitfullscreenchange;
     [NotEnumerable, PerWorldBindings] attribute EventListener onwebkitfullscreenerror;
 };
 
 Element implements ParentNode;
 Element implements ChildNode;