anchor.diff:  library pop_pop_win;
   
   import 'dart:async';
  -import 'dart:html';
  +import 'dart:html' as html;
   
   import 'package:stagexl/stagexl.dart' hide KeyboardEvent;
   
  
positive.code:     ..backgroundColor = 0xb4ad7f
      ..transparent = true;
  
    var stage = new Stage(querySelector('#gameCanvas'), options: options);
  
    new RenderLoop()..addStage(stage);
  
  
negative.code: 
  void _updateAbout() {
    var popDisplay = targetPlatform.showAbout ? 'inline-block' : 'none';
    html.querySelector('#popup').style.display = popDisplay;
  }
  