Example showing alternate async measurement solution

client/html/src/Node.dart

Index: client/html/src/Node.dart
diff --git a/client/html/src/Node.dart b/client/html/src/Node.dart
index f276e34ad09e249f229eb13aa93555bb0f2bdb71..da58a499c48db6ac959eeeb69fdb824e44ab5dce 100644
--- a/client/html/src/Node.dart
+++ b/client/html/src/Node.dart
@@ -1,4 +1,4 @@
-// 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.
 
@@ -34,4 +34,6 @@ interface Node extends EventTarget {
   Node insertBefore(Node newChild, Node refChild);
 
   Node clone(bool deep);
+
+  bool get _inDocument();
 }