Remove the concept of document.documentElement

sky/engine/core/dom/ContainerNode.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2013 Apple Inc. All rights reserved.
  *
  * 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.
@@ skipping 81 matching lines @@
         return;
     }
 }
 
 void ContainerNode::checkAcceptChildHierarchy(const Node& newChild, const Node* oldChild, ExceptionState& exceptionState) const
 {
     if (containsConsideringHostElements(newChild)) {
         exceptionState.ThrowDOMException(HierarchyRequestError, "The new child element contains the parent.");
         return;
     }
-
-    // TODO(esprehn): Remove this, sky should allow multiple top level elements.
-    if (isDocumentNode()) {
-        unsigned elementCount = 0;
-        if (newChild.isElementNode()) {
-            elementCount = 1;
-        } else if (newChild.isDocumentFragment()) {
-            for (Element* element = ElementTraversal::firstChild(newChild); element; element = ElementTraversal::nextSibling(*element))
-                ++elementCount;
-        }
-        if (elementCount > 1 || ((!oldChild || !oldChild->isElementNode()) && elementCount && document().documentElement())) {
-            exceptionState.ThrowDOMException(HierarchyRequestError, "Document can only contain one Element.");
-            return;
-        }
-    }
 }
 
 PassRefPtr<Node> ContainerNode::insertBefore(PassRefPtr<Node> newChild, Node* refChild, ExceptionState& exceptionState)
 {
     // Check that this node is not "floating".
     // If it is, it can be deleted as a side effect of sending mutation events.
     ASSERT(refCount() || parentOrShadowHostNode());
 
     RefPtr<Node> protect(this);
 
@@ skipping 884 matching lines @@
         return true;
 
     if (node->isElementNode() && toElement(node)->shadow())
         return true;
 
     return false;
 }
 #endif
 
 } // namespace blink