First rev of Safe DOM

pkg/unittest/lib/html_enhanced_config.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * A simple unit test library for running tests in a browser.
  *
  * Provides enhanced HTML output with collapsible group headers
  * and other at-a-glance information about the test results.
  */
@@ skipping 50 matching lines @@
     }
   }
 
   void onInit() {
     _installHandlers();
     //initialize and load CSS
     final String _CSSID = '_unittestcss_';
 
     var cssElement = document.head.query('#${_CSSID}');
     if (cssElement == null){
-      document.head.children.add(new Element.html(
-          '<style id="${_CSSID}"></style>'));
-      cssElement = document.head.query('#${_CSSID}');
+      cssElement = new StyleElement();
+      cssElement.id = _CSSID;
+      document.head.append(cssElement);
     }
 
-    cssElement.innerHtml = _htmlTestCSS;
+    cssElement.text = _htmlTestCSS;
     window.postMessage('unittest-suite-wait-for-done', '*');
   }
 
   void onStart() {
     // Listen for uncaught errors.
     _installOnErrorHandler();
   }
 
   void onSummary(int passed, int failed, int errors, List<TestCase> results,
       String uncaughtError) {
@@ skipping 330 matching lines @@
 
   ''';
 }
 
 void useHtmlEnhancedConfiguration([bool isLayoutTest = false]) {
   unittestConfiguration = isLayoutTest ? _singletonLayout : _singletonNotLayout;
 }
 
 final _singletonLayout = new HtmlEnhancedConfiguration(true);
 final _singletonNotLayout = new HtmlEnhancedConfiguration(false);