Implement the inert attribute

third_party/WebKit/Source/core/dom/Node.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, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 753 matching lines @@
 {
     DCHECK(focused());
     return true;
 }
 
 bool Node::isInert() const
 {
     const HTMLDialogElement* dialog = document().activeModalDialog();
     if (dialog && this != document() && (!canParticipateInFlatTree() || !FlatTreeTraversal::containsIncludingPseudoElement(*dialog, *this)))
         return true;
+
+    if (RuntimeEnabledFeatures::inertAttributeEnabled()) {
+        const Node* node = this;
+        do {
+            if (node->isElementNode() && toElement(node)->hasAttribute(HTMLNames::inertAttr))
+                return true;
+            node = node->parentOrShadowHostElement();
+        } while (node);
+    }
+
     return document().localOwner() && document().localOwner()->isInert();
 }
 
 unsigned Node::nodeIndex() const
 {
     const Node* tempNode = previousSibling();
     unsigned count = 0;
     for (count = 0; tempNode; count++)
         tempNode = tempNode->previousSibling();
     return count;
@@ skipping 1698 matching lines @@
 
 void showNodePath(const blink::Node* node)
 {
     if (node)
         node->showNodePathForThis();
     else
         fprintf(stderr, "Cannot showNodePath for (nil)\n");
 }
 
 #endif