anchor.diff:      });
     }
   
  -  _drawElement([_]) {
  +  _drawElement([event]) {
       document.body.nodes.add(el);
   
       window.document.documentElement.rect.then((document) {
  
positive.code:       remove(resizeHandler);
    }
  
    _drawBackground([_]) {
      print('_drawBackground');
      if (bg != null) return;
  
  
negative.code: 
    get on => el.on;
    get parent => el.parent;
    List<Element> queryAll(String selectors) => el.queryAll(selectors);
    Element query(String selectors) => el.query(selectors);
  
    _attachHanders() {
  