anchor.diff:        });
       });
     }
  -
  -  get on() => el.on;
  -  get parent() => el.parent;
  -  ElementList queryAll(String selectors) => el.queryAll(selectors);
  -  Element query(String selectors) => el.query(selectors);
   }
  
positive.code:       bg.style.opacity = '0.8';
        bg.style.zIndex = '1000';
      });
  
      window.document.rect.then((document) {
        el.style.opacity = '0';
  
negative.code:   Node remove() => hide();
  
    Node hide() {
      _removeHandlers();
      bg.remove();
      return el.remove();
    }
  
    void show() {
      _attachHanders();
      _drawBackground();
      _drawElement();
    }
  
    get on() => el.on;
    get parent() => el.parent;
    ElementList queryAll(String selectors) => el.queryAll(selectors);
    Element query(String selectors) => el.query(selectors);
  
    _attachHanders() {
      window.
        on.
        keyDown.
        add((event) {
          if (event.keyCode == 27) remove();
        });
  
      window.
        on.
        resize.
        add(_drawBackground);
    }
  
    _removeHandlers() {
      window.
        on.
        resize.
        remove(_drawBackground);
    }
  
    _drawBackground([_]) {
      bg = new Element.tag('div');
      document.body.nodes.add(bg);
  
      window.document.rect.then((document) {
        bg.style.position = 'absolute';
  