anchor.diff:    void showStrong() {
       Uri url = Uri.parse(window.location.toString());
       String strong = url.queryParameters['strong'];
  -    if (_isStrongMode(strong)) {
  +    if (_parseStrongModeParam(strong)) {
         (querySelector('#strongmode') as InputElement).checked = true;
       }
  -    querySelector('#strongmode').onChange.listen((e) {
  -      _performAnalysis();
  -    });
     }
   
     void showHome(RouteEnterEvent event) {
  
positive.code:   /**
     * Return if strong mode should be enabled
     */
    bool _isStrongMode(String strong) {
      if (strong == null) return false;
      return !(strong == 'false' || strong == 'f');
    }
  
    /**
  
negative.code:     registerCancelExportButton();
      registerAffirmExportButton();
      registerConsole();
      registerStrongMode();
      _clearOutput();
    }
  
  