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diff --git a/dom/base/test/test_messagePort.html b/dom/base/test/test_messagePort.html
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index 0000000000..c4fc9d11ce
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+++ b/dom/base/test/test_messagePort.html
@@ -0,0 +1,114 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=912456
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 912456 - port cloning</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=912456">Mozilla Bug 912456</a>
+<script type="application/javascript">
+
+  function testTransfer() {
+    var a = new MessageChannel();
+    ok(a, "MessageChannel created");
+
+    window.addEventListener('message', receiveMessage);
+    function receiveMessage(evt) {
+      ok(evt.data.port, "Port has been received!");
+
+      var a1 = new MessageChannel();
+      ok(a1, "MessageChannel created");
+
+      try {
+        evt.data.port.postMessage({port: a1.port2});
+        ok(false, "PostMessage should throw! - no transfered port");
+      } catch(e) {
+        ok(true, "PostMessage should throw! - no transfered port");
+      }
+
+      try {
+        evt.data.port.postMessage({port: a1.port2}, [a1.port2, a1.port2]);
+        ok(false, "PostMessage should throw - no duplicate!");
+      } catch(e) {
+        ok(true, "PostMessage should throw - no duplicate!");
+      }
+
+      evt.data.port.postMessage({port: a1.port2}, [a1.port2]);
+    }
+
+    a.port1.onmessage = function(evt) {
+      ok(evt.data.port, "Port has been received!");
+      window.removeEventListener('message', receiveMessage);
+      runTest();
+    }
+
+    try {
+      postMessage({ port: a.port2}, 42, '*');
+      ok(false, "PostMessage should throw! - no transfered port");
+    } catch(e) {
+      ok(true, "PostMessage should throw! - no transfered port");
+    }
+
+    try {
+      postMessage({ port: a.port2}, 42, '*', [a.port2, a.port2]);
+      ok(false, "PostMessage should throw - no duplicate!");
+    } catch(e) {
+      ok(true, "PostMessage should throw - no duplicate!");
+    }
+
+    postMessage({port: a.port2}, '*', [a.port2]);
+  }
+
+  function testPorts() {
+    var a = new MessageChannel();
+    ok(a, "MessageChannel created");
+
+    window.addEventListener('message', receiveMessage);
+    function receiveMessage(evt) {
+      ok(evt.data, "Data is 42");
+      ok(evt.ports, "Port is received");
+      is(evt.ports.length, 1, "Ports.length is 1");
+
+      var a1 = new MessageChannel();
+      ok(a1, "MessageChannel created");
+
+      evt.ports[0].postMessage(42, [a1.port2]);
+    }
+
+    a.port1.onmessage = function(evt) {
+      ok(evt.data, "Data is 42");
+      ok(evt.ports, "Port is received");
+      is(evt.ports.length, 1, "Ports.length is 1");
+      window.removeEventListener('message', receiveMessage);
+      runTest();
+    }
+
+    postMessage(42, '*', [a.port2]);
+  }
+
+  var tests = [
+    testTransfer,
+    testPorts
+  ];
+
+  function runTest() {
+    if (!tests.length) {
+      SimpleTest.finish();
+      return;
+    }
+
+    var test = tests.shift();
+    test();
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  runTest();
+
+</script>
+</body>
+</html>