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Test Info:

<!DOCTYPE html>
<title> event.ports returns the MessagePort array sent with the message </title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<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>
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()
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(, ExpectedResult, "");
assert_true(e.ports[0] instanceof MessagePort, e.ports[0] + " instanceof MessageChannel");
assert_true(e.ports[1] instanceof MessagePort, e.ports[1] + " instanceof MessageChannel");