Add all dart:html tests from the sdk to test/codegen.

test/codegen/lib/html/element_constructor_1_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.
+
+// Put universally passing event constructors in this file.
+// Move constructors that fail on some configuration to their own
+// element_constructor_foo_test.dart file.
+
+library ElementConstructorTest;
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_config.dart';
+import 'dart:html';
+
+main() {
+  useHtmlConfiguration();
+
+  var isAnchorElement = 
+      predicate((x) => x is AnchorElement, 'is an AnchorElement');
+  var isAreaElement = 
+      predicate((x) => x is AreaElement, 'is an AreaElement');
+  var isDivElement = predicate((x) => x is DivElement, 'is a DivElement');
+  var isCanvasElement = 
+      predicate((x) => x is CanvasElement, 'is a CanvasElement');
+  var isParagraphElement =
+      predicate((x) => x is ParagraphElement, 'is a ParagraphElement');
+  var isSpanElement = predicate((x) => x is SpanElement, 'is a SpanElement');
+  var isSelectElement = 
+      predicate((x) => x is SelectElement, 'is a SelectElement');
+
+  test('anchor1', () {
+      var e = new AnchorElement();
+      expect(e, isAnchorElement);
+    });
+
+  test('anchor2', () {
+      var e = new AnchorElement(href: '#blah');
+      expect(e, isAnchorElement);
+      expect(e.href, endsWith('#blah'));
+    });
+
+  test('area', () {
+      var e = new AreaElement();
+      expect(e, isAreaElement);
+    });
+
+  // AudioElement tested in audioelement_test.dart
+
+  test('div', () {
+      var e = new DivElement();
+      expect(e, isDivElement);
+    });
+
+  test('canvas1', () {
+      var e = new CanvasElement();
+      expect(e, isCanvasElement);
+    });
+
+  test('canvas2', () {
+      var e = new CanvasElement(height: 100, width: 200);
+      expect(e, isCanvasElement);
+      expect(e.width, 200);
+      expect(e.height, 100);
+    });
+
+  test('p', () {
+      var e = new ParagraphElement();
+      expect(e, isParagraphElement);
+    });
+
+  test('span', () {
+      var e = new SpanElement();
+      expect(e, isSpanElement);
+    });
+
+  test('select', () {
+      var e = new SelectElement();
+      expect(e, isSelectElement);
+    });
+}