Example showing alternate async measurement solution

client/html/src/Node.dart

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // TODO(jacobr): stop extending eventTarget.
 interface Node extends EventTarget {
 
   NodeList get nodes();
 
   // TODO: The type of value should be Collection<Node>. See http://b/5392897
   void set nodes(value);
@@ skipping 15 matching lines @@
   Node remove();
 
   bool contains(Node otherNode);
 
   // TODO(jacobr): remove when/if Array supports a method similar to
   // insertBefore or we switch NodeList to implement LinkedList rather than
   // array.
   Node insertBefore(Node newChild, Node refChild);
 
   Node clone(bool deep);
+
+  bool get _inDocument();
 }