Use language or userlanguage (IE) depending on what's defined in the browser.

tests/html/navigator_test.dart

Index: tests/html/navigator_test.dart
diff --git a/tests/html/b_element_test.dart b/tests/html/navigator_test.dart
similarity index 55%
copy from tests/html/b_element_test.dart
copy to tests/html/navigator_test.dart
index 1cd71b6a1e7800b8ff62c18a6438f6bca7dd5f1e..abbcc4e541930072c804bb0f7423d5425779052b 100644
--- a/tests/html/b_element_test.dart
+++ b/tests/html/navigator_test.dart
@@ -1,4 +1,4 @@
-library BElementTest;
+library NavigatorTest;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_config.dart';
 import 'dart:html';
@@ -6,8 +6,7 @@ import 'dart:html';
 main() {
   useHtmlConfiguration();
 
-  test('create b', () {
-    new Element.tag('b');
-  });
+  test('language never returns null', () {
+      expect(window.navigator.language, isNotNull);
+    });
 }
-