use .append instead of .nodes.add

tests/html/binding_syntax_test.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.
 
 library binding_syntax_test;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:html';
 import 'package:mdv_observe/mdv_observe.dart';
 import 'package:unittest/html_config.dart';
 import 'package:unittest/unittest.dart';
 import 'mdv_observe_utils.dart';
 
 // Note: this file ported from
 // https://github.com/toolkitchen/mdv/blob/master/tests/syntax.js
 
 main() {
   useHtmlConfiguration();
   group('Syntax', syntaxTests);
 }
 
 syntaxTests() {
   var testDiv;
 
   setUp(() {
-    document.body.nodes.add(testDiv = new DivElement());
+    document.body.append(testDiv = new DivElement());
   });
 
   tearDown(() {
     testDiv.remove();
     testDiv = null;
   });
 
   createTestHtml(s) {
     var div = new DivElement();
     div.innerHtml = s;
-    testDiv.nodes.add(div);
+    testDiv.append(div);
 
     for (var node in div.queryAll('*')) {
       if (node.isTemplate) TemplateElement.decorate(node);
     }
 
     return div;
   }
 
   recursivelySetTemplateModel(element, model) {
     for (var node in element.queryAll('*')) {
@@ skipping 204 matching lines @@
 class TimesTwoSyntax extends CustomBindingSyntax {
   getBinding(model, path, name, node) {
     path = path.trim();
     if (!path.startsWith('2x:')) return null;
 
     path = path.substring(3);
     return new CompoundBinding((values) => values['value'] * 2)
         ..bind('value', model, path);
   }
 }