Changes to make it easier to add elements.

sdk/lib/html/dart2js/html_dart2js.dart

 library html;
 
 import 'dart:isolate';
 import 'dart:json';
 import 'dart:svg' as svg;
 // Copyright (c) 2012, 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.
 
 // DO NOT EDIT
@@ skipping 6851 matching lines @@
     => this._insertAdjacentNode(where, element);
 
   void insertAdjacentText(String where, String text) {
     this._insertAdjacentNode(where, new Text(text));
   }
 
   void insertAdjacentHTML(String where, String text) {
     this._insertAdjacentNode(where, new DocumentFragment.html(text));
   }
 
-  void addText(String text) {
+  void append(Element element) {
+    this.children.add(element);
+  }
+
+  void appendText(String text) {
     this.insertAdjacentText('beforeend', text);
   }
 
-  void addHtml(String text) {
+  void appendHtml(String text) {
     this.insertAdjacentHTML('beforeend', text);
   }
 
   // If we can come up with a semi-reasonable default value for an Element
   // getter, we'll use it. In general, these return the same values as an
   // element that has no parent.
   String get contentEditable => "false";
   bool get isContentEditable => false;
   bool get draggable => false;
   bool get hidden => false;
@@ skipping 801 matching lines @@
   }
 
   /** @domName Window.getComputedStyle */
   Future<CSSStyleDeclaration> getComputedStyle(String pseudoElement) {
     return _createMeasurementFuture(
         () => window.$dom_getComputedStyle(this, pseudoElement),
         new Completer<CSSStyleDeclaration>());
   }
 
   /**
+   * Adds the specified element to after the last child of this.
+   */
+  void append(Element e) {
+    this.children.add(e);
+  }
+
+  /**
    * Adds the specified text as a text node after the last child of this.
    */
-  void addText(String text) {
+  void appendText(String text) {
     this.insertAdjacentText('beforeend', text);
   }
 
   /**
    * Parses the specified text as HTML and adds the resulting node after the
    * last child of this.
    */
-  void addHtml(String text) {
+  void appendHtml(String text) {
     this.insertAdjacentHTML('beforeend', text);
   }
 
   // Hooks to support custom WebComponents.
   /**
    * Experimental support for [web components][wc]. This field stores a
    * reference to the component implementation. It was inspired by Mozilla's
    * [x-tags][] project. Please note: in the future it may be possible to
    * `extend Element` from your class, in which case this field will be
    * deprecated and will simply return this [Element] object.
@@ skipping 17390 matching lines @@
     if (length < 0) throw new ArgumentError('length');
     if (start < 0) throw new RangeError.value(start);
     int end = start + length;
     if (end > a.length) throw new RangeError.value(end);
     for (int i = start; i < end; i++) {
       accumulator.add(a[i]);
     }
     return accumulator;
   }
 }