<!DOCTYPE html>
<html>
<head>
<title> postMessage(): read-only ports array </title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<div id=log></div>
<script>
var TargetPort = null;
var description = "The postMessage() method - Make new ports into a read only array.";
var t = async_test("Test Description: " + description);
var channel = new MessageChannel();
TargetPort = channel.port2;
TargetPort.start();
TargetPort.addEventListener("message", t.step_func(TestMessageEvent), true);
var channel2 = new MessageChannel();
channel.port1.postMessage("ports", [channel2.port1]);
function TestMessageEvent(evt)
{
var channel3 = new MessageChannel();
evt.ports.push(channel3.port1);
evt.ports.push(channel3.port1);
assert_equals(evt.ports.length, 1, "ports is a read only array with length == 1.");
t.done();
}
</script>
</body>
</html>