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/)
  *
@@ skipping 761 matching lines @@
   DCHECK(isFocused());
   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() &&

[esprehn, 2017/02/07 23:50:59]

I think this probably wants to walk the composed tree using
FlatTreeTraversal::parentElement? Otherwise you can end up with non-inert stuff
inside inert stuff using <slot>.

[aboxhall, 2017/02/08 05:26:01]

Done.

+          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 1772 matching lines @@
   if (node) {
     std::stringstream stream;
     node->printNodePathTo(stream);
     LOG(INFO) << stream.str();
   } else {
     LOG(INFO) << "Cannot showNodePath for <null>";
   }
 }
 
 #endif