anchor.diff:  
     BaseElement base;
     Map<String, Object> _scopes;
  -  Element _fragment;
  +  DocumentFragment _fragment;
   
     var content;
     var entities;
   
  -  var container;
  -
     Layout(this.entities) : _scopes = new Map<String, Object>() {
       init();
       
  -    
       _fragment = new DocumentFragment();
  -    container = new Element.html('<div>');
  -    _fragment.elements.add(container);
  -
  +    
  +    
       final EntityContainer entityContainer = new EntityContainer(entities);
  -    container.elements.add(entityContainer.root);
  +    _fragment.elements.add(entityContainer.root);
   
       final EntityViewer entityViewer = new EntityViewer(entities);
  -    container.elements.add(entityViewer.root);
  +    _fragment.elements.add(entityViewer.root);
  +    
       document.body.elements.add(_fragment);
       
       entityContainer.addUiHandler();
  
positive.code:      }
    }
    
    Map<String, Object> _scopes;
    Element _fragment;
  
    final List entities;
  
    EntityContainer(this.entities) : _scopes = new Map<String, Object>() {
      _fragment = new DocumentFragment();
      
      var containerTable = new Element.html("""
          <table>
            <caption>Container</caption>
            <thead>
              <tr>
                <td>#</td>
  
negative.code: #import('dart:html');
  
  class EntityContainer {
    InputElement symbolFrom;
    InputElement symbolTo;
    LabelElement symbolToLabel;
  