Some HTML API cleanup

tests/html/query_test.dart

+// Copyright (c) 2011, 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('QueryTest');
+#import('../../lib/unittest/unittest.dart');
+#import('../../lib/unittest/html_config.dart');
+#import('dart:html');
+
+main() {
+  useHtmlConfiguration();
+
+  final div = new DivElement();
+  final canvas = new CanvasElement(200,200);
+  canvas.id = 'testcanvas';
+  final element =
+      new Element.html("<div><br/><img/><input/><img/></div>");
+  document.body.nodes.addAll([div, canvas,  element]);
+  
+
+  test('query', () {
+      Element e = query('#testcanvas');
+      Expect.isNotNull(e);
+      Expect.stringEquals('testcanvas', e.id);
+      Expect.isTrue(e is CanvasElement);
+      Expect.equals(canvas, e);
+    });
+
+  test('query (None)', () {
+      Element e = query('#nothere');
+      Expect.isNull(e);
+    });
+
+  test('queryAll (One)', () {
+      List l = queryAll('canvas');
+      Expect.equals(1, l.length);
+      Expect.equals(canvas, l[0]);
+    });
+
+
+  test('queryAll (Multiple)', () {
+      List l = queryAll('img');
+      Expect.equals(2, l.length);
+      Expect.isTrue(l[0] is ImageElement);
+      Expect.isTrue(l[1] is ImageElement);
+      Expect.notEquals(l[0], l[1]);
+    });
+
+  test('queryAll (None)', () {
+      List l = queryAll('video');
+      Expect.isTrue(l.isEmpty());
+    });
+}