anchor.diff:        _element.append(_typeSpan);
       }
   
  -    _element.classes.add("${Outline.ITEM_CSS_CLASS} ${cssClassName}");
  +    _element.classes.add("${Outline._ITEM_CSS_CLASS} ${cssClassName}");
     }
   
     String get displayName => _data.name;
  
positive.code:  * Defines a class to build an outline UI for a given block of code.
   */
  class Outline {
    static const ITEM_CSS_CLASS = 'outlineItem';
  
    List<OutlineItem> _outlineItems;
    OutlineItem _selectedItem;
  
negative.code:   bool get showing => _visible && !_outlineDiv.classes.contains('collapsed');
  
    void setFontSize(num size) {
      _rootList.style.fontSize = '${size}px';
      // Outline items are created dynamically, so we can't just modify element's
      // style: we have to modify the CSS rule that applies to all items.
      _outlineItemCssRules.forEach((rule) => rule.style.height = '${size}px');
    }
  
    /**
  