Cross frame access tests

client/tests/client/dom/InnerFrameTest.dart

Index: client/tests/client/dom/InnerFrameTest.dart
diff --git a/client/tests/client/dom/InnerFrameTest.dart b/client/tests/client/dom/InnerFrameTest.dart
new file mode 100644
index 0000000000000000000000000000000000000000..6e2d9cf1ec477af128574d36cf2750cbbaf46271
--- /dev/null
+++ b/client/tests/client/dom/InnerFrameTest.dart
@@ -0,0 +1,40 @@
+#library('InnerFrameTest');
+#import('../../../testing/unittest/unittest.dart');
+#import('dart:dom');
+
+main() {
+  if (window != window.top) {
+    // Child frame.
+
+    // The child's frame should not be able to access its parent's
+    // document.
+    try {
+      var parentDocument = window.frameElement.ownerDocument;
+      var div = parentDocument.createElement("div");
+      div.id = "illegal";
+      parentDocument.body.appendChild(div);
+      Expect.fail('Should not reach here.');
+    } catch (NoSuchMethodException e) {
+      // Expected.
+    }
+    return;
+  }
+
+  // Parent / test frame
+  forLayoutTests();
+
+  final iframe = document.createElement('iframe');
+  iframe.src = window.location.href;
+
+  asyncTest('prepare', 1, () {
+      iframe.addEventListener('load', (e) => callbackDone(), false);
+      document.body.appendChild(iframe);
+    });
+
+  test('frameElement', () {
+      var div = document.getElementById('illegal');
+
+      // Ensure that this parent frame was not modified by its child.
+      Expect.isNull(div);
+    });
+}