anchor.diff:    /// The data key used to retrieve the tooltip text.
     final String dataKey;
   
  -  /// The CSS class applied to the tooltip its style.
  +  /// The CSS class applied to the tooltip style.
     final String baseCssClass;
   
     /// The CSS class applied to the tooltip to show it.
  
positive.code:       _display.enter();
      });
  
      _display.onStream(root.onMouseOut, (Event event) {
        _cooling.enter();
      });
  
      _cooling.onStream(root.onMouseOver, (Event event) {
        Element element = event.target;
        if (element.dataset.containsKey(dataKey)) {
          show(_element = element, _element.dataset[dataKey]);
  
negative.code:       }
      });
  
      _heating.onStream(root.onMouseOut, (MouseEvent event) {
        _element = null;
        _waiting.enter();
      });
  