anchor.diff:  
       tooltipElem = new dom.DivElement();
   
  -    dom.ImageElement imgElem = new dom.ImageElement();
  -    imgElem.width = displayModel.imgWidth;
  -    imgElem.src = displayModel.imgUrl;
  +    dom.ImageElement imgElem = new dom.ImageElement()
  +      ..width = displayModel.imgWidth
  +      ..src = displayModel.imgUrl;
       tooltipElem.append(imgElem);
   
       if (displayModel.text != null) {
  -      dom.DivElement textSpan = new dom.DivElement();
  -      textSpan.appendText(displayModel.text);
  -      textSpan.style.color = "white";
  -      textSpan.style.fontSize = "smaller";
  -      textSpan.style.paddingBottom = "5px";
  +      dom.DivElement textSpan = new dom.DivElement()
  +        ..appendText(displayModel.text)
  +        ..style.color = "white"
  +        ..style.fontSize = "smaller"
  +        ..style.paddingBottom = "5px";
   
         tooltipElem.append(textSpan);
       }
   
  -    tooltipElem.style.padding = "5px";
  -    tooltipElem.style.paddingBottom = "0px";
  -    tooltipElem.style.backgroundColor = "black";
  -    tooltipElem.style.borderRadius = "5px";
  -    tooltipElem.style.width = "${displayModel.imgWidth.toString()}px";
  +    tooltipElem.style
  +      ..padding = "5px"
  +      ..paddingBottom = "0px"
  +      ..backgroundColor = "black"
  +      ..borderRadius = "5px"
  +      ..width = "${displayModel.imgWidth.toString()}px";
   
       // find the coordinates of the parent DOM element
       Rectangle bounds = element.getBoundingClientRect();
       int left = (bounds.left + dom.window.pageXOffset).toInt();
       int top = (bounds.top + dom.window.pageYOffset).toInt();
  -    int width = (bounds.width).toInt();
  -    int height = (bounds.height).toInt();
  +    int width = bounds.width.toInt();
  +    int height = bounds.height.toInt();
   
       // position the tooltip.
       // Figure out where the containing element sits in the window.
       int tooltipLeft = left + width + 10;
       int tooltipTop = top - height;
  -    tooltipElem.style.position = "absolute";
  -    tooltipElem.style.top = "${tooltipTop}px";
  -    tooltipElem.style.left = "${tooltipLeft}px";
  +    tooltipElem.style
  +      ..position = "absolute"
  +      ..top = "${top - height}px"
  +      ..left = "${left + width + 10}px";
   
       // Add the tooltip to the document body. We add it here because
       // we need to position it absolutely, without reference to its
  
positive.code: 
    dom.Element tooltipElem;
  
    Tooltip(dom.Element this.element, dom.Node this.node,
        Scope this.scope) {
  
      element.onMouseEnter.listen((event) {
        _createTemplate();
      });
  
      element.onMouseLeave.listen((event) {
        _destroyTemplate();
      });
    }
  
    _createTemplate() {
  
negative.code:   String text;
    int imgWidth;
  
    TooltipModel(this.imgUrl, this.text, this.imgWidth);
  }
  