fixes #168, dart:js implementation with a test

test/browser/dom.dart

Index: test/browser/dom.dart
diff --git a/test/codegen/sunflower/dom.dart b/test/browser/dom.dart
similarity index 83%
copy from test/codegen/sunflower/dom.dart
copy to test/browser/dom.dart
index 9a5f2668582d7ca4182213f6fe744274aa6c698d..6db45da62ed6ef7bd8d62ef4fa9d85012faa2b67 100644
--- a/test/codegen/sunflower/dom.dart
+++ b/test/browser/dom.dart
@@ -5,6 +5,8 @@
 @JsName(name: 'window')
 library dom;
 
+@JsName()
+class Window {}
 
 class JsName {
   /// The JavaScript name.
@@ -20,22 +22,55 @@ class Overload {
 const overload = const Overload();
 
 external Document get document;
+external Window get window;
 
-@JsName(name: 'Document')
-abstract class Document {
+@JsName()
+abstract class Document extends Node {
   Element createElement(String name);
   Element querySelector(String selector);
+
+  HTMLElement head;
+  HTMLElement body;
+}
+
+@JsName()
+class Blob {
+  external Blob(blobParts, {String type});
 }
 
-@JsName(name: 'Element')
-abstract class Element {
+@JsName()
+class CustomEvent {
+  external CustomEvent(String type, {detail, bubbles, cancelable});
+}
+
+@JsName()
+abstract class Element extends Node {
   void addEventListener(String type, EventListener callback, [bool capture]);
   String textContent;
+}
+
+@JsName()
+abstract class HTMLElement extends Element {
+  String innerHTML;
+  HTMLCollection get children;
+}
+
+@JsName()
+abstract class Node {
+  bool hasChildNodes();
   NodeList get childNodes;
+
+  Node insertBefore(Node node, [Node child]);
+  Node appendChild(Node node);
+  Node replaceChild(Node node, Node child);
+  Node removeChild(Node child);
 }
 
 @JsName()
-class Node {}
+abstract class HTMLCollection {
+  int get length;
+  external Element operator [](num index);
+}
 
 @JsName()
 class NodeList {
@@ -53,16 +88,28 @@ typedef void EventListener(Event e);
 @JsName()
 abstract class Event {}
 
+// TODO(jmesserly): rename these
 @JsName(name: 'HTMLInputElement')
-abstract class InputElement extends Element {
+abstract class InputElement extends HTMLElement {
   String value;
 }
 
 @JsName(name: 'HTMLCanvasElement')
-abstract class CanvasElement extends Element {
+abstract class CanvasElement extends HTMLElement {
   RenderingContext getContext(String contextId);
 }
 
+@JsName(name: 'HTMLDivElement')
+abstract class DivElement extends HTMLElement {
+  RenderingContext getContext(String contextId);
+}
+
+@JsName(name: 'HTMLScriptElement')
+abstract class ScriptElement extends HTMLElement {
+  String type;
+}
+
+
 // TODO(jmesserly): union type of CanvasRenderingContext2D and
 // WebGLRenderingContext
 abstract class RenderingContext {}