anchor.diff:    }
   
     void setThemeColor(ui.Color color) {
  -    html.MetaElement? theme = html.document.querySelector('#flutterweb-theme') as html.MetaElement?;
  +    html.MetaElement? theme =
  +        html.document.querySelector('#flutterweb-theme') as html.MetaElement?;
       if (theme == null) {
         theme = html.MetaElement()
           ..id = 'flutterweb-theme'
  
positive.code:   Future<bool> setPreferredOrientation(List<dynamic>? orientations) {
      final html.Screen screen = html.window.screen!;
      if (!_unsafeIsNull(screen)) {
        final html.ScreenOrientation? screenOrientation =
            screen.orientation;
        if (!_unsafeIsNull(screenOrientation)) {
          if (orientations!.isEmpty) {
            screenOrientation!.unlock();
  
negative.code:   /// Note: always check for rotations for a mobile device. Update the physical
    /// size if the change is caused by a rotation.
    void _metricsDidChange(html.Event? event) {
      if (isMobile && !window.isRotation() && textEditing.isEditing) {
        window.computeOnScreenKeyboardInsets();
        EnginePlatformDispatcher.instance.invokeOnMetricsChanged();
      } else {
  