anchor.diff:          [tagName, jsConstructor]);
     }
   
  -  // TODO add tests
  +  // TODO more tests
     static JsFunction call(Map constructor) =>
         context.callMethod("Polymer", [jsify(constructor)]);
   
  -  // TODO add tests
     static JsFunction Class(Map constructor) =>
         context["Polymer"].callMethod("Class", [jsify(constructor)]);
   
  
positive.code: export 'package:polymerjs/polymerdom.dart';
  export 'package:polymerjs/dollar_functions.dart';
  export 'package:polymerjs/event_details.dart';
  
  class Polymer extends Object {
    static final JsObject js = context['Polymer'];
  
negative.code:   /// such as adding or removing classes in this element's local DOM.
    static updateStyles() => context["Polymer"].callMethod("updateStyles");
  }
  
  
  class WebElement extends Object with JsMixin {
    final HtmlElement element;
  