anchor.diff:  
     void onStart() {
       // Listen for uncaught errors.
  -    window.on.error.add(_onErrorClosure);
  +    _installOnErrorHandler();
     }
   
     void onTestResult(TestCase testCase) {}
  
positive.code:  */
  library unittest_html_enhanced_config;
  
  import 'dart:collection' show LinkedHashMap;
  import 'dart:html';
  import 'unittest.dart';
  
negative.code:   }
  
  
    static bool get _isIE => window.navigator.userAgent.contains('MSIE');
  
    String get _htmlTestCSS =>
    '''
  