sdk/lib/html/dart2js/html_dart2js.dart

Index: sdk/lib/html/dart2js/html_dart2js.dart
diff --git a/sdk/lib/html/dart2js/html_dart2js.dart b/sdk/lib/html/dart2js/html_dart2js.dart
index 3ff4de478d50a34b5b81de3802c730fb7732a4fc..22b173468b843fd3ad90e89abd59083d2f9f66dc 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -9901,6 +9901,7 @@ abstract class Element extends Node implements ParentNode, ChildNode native "Ele
    * This method is the Dart equivalent to jQuery's
    * [offset](http://api.jquery.com/offset/) method.
    */
+  @Experimental()
   Point get documentOffset => offsetTo(document.documentElement);
 
   /**
@@ -9914,6 +9915,7 @@ abstract class Element extends Node implements ParentNode, ChildNode native "Ele
    * element is _not_ an offset parent or transitive offset parent to this
    * element, an [ArgumentError] is thrown.
    */
+  @Experimental()
   Point offsetTo(Element parent) {
     return Element._offsetToHelper(this, parent);
   }