anchor.diff:              _updateOwnershipClass, _getChildrenOwnershipClass,
               items: items, queue: _r.queue);
           _tree.expand(_snapshot.dominatorTree);
  -        report.add(_tree);
  +        final text = 'An object X is said to "own" object Y if X is the only '
  +            'object that references Y, or X owns the only object that '
  +            'references Y. In particular, objects "own" the space of any '
  +            'unshared lists or maps they reference.';
  +        report.addAll([
  +          new DivElement()
  +            ..classes = ['content-centered-big', 'explanation']
  +            ..text = text,
  +          _tree
  +        ]);
           break;
         case HeapSnapshotTreeMode.groupByClass:
           final items = _snapshot.classReferences.toList();
  
positive.code:   void _updateOwnershipClass(HtmlElement element, item, int depth) {
      _updateLines(element.children[1].children, depth);
      element.children[0].text = Utils.formatSize(item.size);
      element.children[1] =
          new ClassRefElement(_isolate, item.clazz, queue: _r.queue)
            ..classes = ['name'];
    }
  
    static _updateLines(List<Element> lines, int n) {
  
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;
  