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diff --git a/testing/web-platform/tests/webmessaging/event.ports.sub.htm b/testing/web-platform/tests/webmessaging/event.ports.sub.htm
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+<!DOCTYPE html>
+<html>
+<head>
+<title> event.ports returns the MessagePort array sent with the message </title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+<div id=log></div>
+
+<div style="display:none">
+ <iframe width="70%" onload="PostMessageTest()" src="{{location[scheme]}}://{{domains[www1]}}:{{location[port]}}/webmessaging/support/ChildWindowPostMessage.htm"></iframe>
+</div>
+
+<script>
+
+
+ var description = "Test Description: event.ports returns the MessagePort array sent with the message.";
+
+ var t = async_test(description);
+
+ var DATA = {test: "e.source.postMessage(e.ports.toString(), '*', e.ports)"};
+ var TARGET = document.querySelector("iframe");
+ var ExpectedResult = "";
+
+ function PostMessageTest()
+ {
+ test(function()
+ {
+ assert_own_property(window, "MessageChannel", "window");
+
+ var channel = new MessageChannel();
+ var ports = [channel.port1, channel.port2];
+ ExpectedResult = ports.toString();
+ TARGET.contentWindow.postMessage(DATA, "*", ports);
+
+ }, "MessageChannel is supported.");
+ }
+
+ window.onmessage = t.step_func(function(e)
+ {
+ assert_equals(e.data, ExpectedResult, "e.data");
+ assert_true(e.ports[0] instanceof MessagePort, e.ports[0] + " instanceof MessageChannel");
+ assert_true(e.ports[1] instanceof MessagePort, e.ports[1] + " instanceof MessageChannel");
+ t.done();
+ });
+</script>
+</body>
+</html>