anchor.diff:        ..children = [
           new SpanElement()
             ..classes = ['size']
  -          ..title = 'size',
  +          ..title = 'owned size',
  +        new SpanElement()
  +          ..classes = ['percentage']
  +          ..title = 'percentage of heap owned',
           new SpanElement()..classes = ['name']
         ];
     }
  
positive.code:         report.addAll([
            new DivElement()
              ..classes = ['content-centered-big', 'explanation']
              ..text = text
              ..title = text,
            _tree
          ]);
          break;
  
negative.code:             'X. This allows you to find "choke points" that are '
              'holding onto a lot of memory. If an object becomes '
              'garbage, all its children in the dominator tree become '
              'garbage as well.';
          report.addAll([
            new DivElement()
              ..classes = ['content-centered-big', 'explanation']
              ..text = text,
            _tree
          ]);
          break;
  