Remove the concept of document.documentElement

sky/engine/core/rendering/RenderObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 1824 matching lines @@
 }
 
 void RenderObject::imageChanged(WrappedImagePtr, const IntRect*)
 {
     if (parent())
         document().scheduleVisualUpdate();
 }
 
 Element* RenderObject::offsetParent() const
 {
-    if (isDocumentElement())
-        return 0;
-
     Node* node = 0;
     for (RenderObject* ancestor = parent(); ancestor; ancestor = ancestor->parent()) {
         // Spec: http://www.w3.org/TR/cssom-view/#offset-attributes
         node = ancestor->node();
         if (!node)
             continue;
 
         if (ancestor->isPositioned())
             break;
     }
@@ skipping 117 matching lines @@
 {
     if (object1) {
         const blink::RenderObject* root = object1;
         while (root->parent())
             root = root->parent();
         root->showRenderTreeAndMark(object1, "*", object2, "-", 0);
     }
 }
 
 #endif