Implement Custom Elements' attributeChangedCallback.

Source/core/dom/Node.idl

 /*
  * Copyright (C) 2006, 2007, 2008, 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,
@@ skipping 56 matching lines @@
                                        [TreatNullAs=NullString,Default=Undefined] optional DOMString version);
 
     [TreatReturnedNullStringAs=Null, PerWorldBindings] readonly attribute DOMString        namespaceURI;
              [TreatReturnedNullStringAs=Null, TreatNullAs=NullString, PerWorldBindings, SetterRaisesException] attribute DOMString        prefix;
     [TreatReturnedNullStringAs=Null, PerWorldBindings] readonly attribute DOMString        localName;
 
     // Introduced in DOM Level 3:
     [TreatReturnedNullStringAs=Null, PerWorldBindings] readonly attribute DOMString       baseURI;
 
              // FIXME: the spec says this can also raise on retrieval.
-             [TreatReturnedNullStringAs=Null, TreatNullAs=NullString, PerWorldBindings, SetterRaisesException] attribute DOMString       textContent;
+             [TreatReturnedNullStringAs=Null, TreatNullAs=NullString, PerWorldBindings, SetterRaisesException, DeliverCustomElementCallbacks] attribute DOMString       textContent;
 
     boolean            isSameNode([Default=Undefined] optional Node other);
     boolean            isEqualNode([Default=Undefined] optional Node other);
     [TreatReturnedNullStringAs=Null] DOMString          lookupPrefix([TreatNullAs=NullString,Default=Undefined] optional DOMString namespaceURI);
     boolean            isDefaultNamespace([TreatNullAs=NullString,Default=Undefined] optional DOMString namespaceURI);
     [TreatReturnedNullStringAs=Null] DOMString          lookupNamespaceURI([TreatNullAs=NullString,Default=Undefined] optional DOMString prefix);
 
     // DocumentPosition
     const unsigned short      DOCUMENT_POSITION_DISCONNECTED = 0x01;
     const unsigned short      DOCUMENT_POSITION_PRECEDING    = 0x02;
@@ skipping 11 matching lines @@
     [PerWorldBindings] readonly attribute Element          parentElement;
 
     void addEventListener(DOMString type, 
                           EventListener listener, 
                           optional boolean useCapture);
     void removeEventListener(DOMString type, 
                              EventListener listener, 
                              optional boolean useCapture);
     [RaisesException] boolean dispatchEvent(Event event);
 };