anchor.diff:      <div class="message">${prompt}</div>
   ''',
         validator: new PermissiveNodeValidator(),
  -      treeSanitizer: NodeTreeSanitizer.trusted);
  +      treeSanitizer: new TrustedHtmlTreeSanitizer());
   
     Element editorElement = element.querySelector('atom-text-editor');
     JsFunction editorConverter = context['getTextEditorForElement'];
  
positive.code: 
  import 'dart:async';
  import 'dart:convert' show JSON;
  import 'dart:html' show DivElement, Element, HttpRequest, NodeValidator,
      NodeTreeSanitizer, window;
  import 'dart:js';
  
  
negative.code:   }
  }
  
  class TrustedHtmlTreeSanitizer implements NodeTreeSanitizer {
    const TrustedHtmlTreeSanitizer();
  
    void sanitizeTree(Node node) { }
  }
  
  Future<Map> loadPackageJson() {
    return HttpRequest.getString('atom://dartlang/package.json').then((str) {
      return JSON.decode(str);
  