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<!DOCTYPE html>
<title> postMessage(): read-only ports array </title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id=log></div>
<script>
async_test(function(t) {
var channel = new MessageChannel();
var targetPort = channel.port2;
targetPort.start();
targetPort.addEventListener("message", t.step_func_done(function(e) {
var channel3 = new MessageChannel();
e.ports.push(channel3.port1);
e.ports.push(channel3.port1);
assert_equals(e.ports.length, 1, "ports is a read only array with length == 1.");
}), true);
var channel2 = new MessageChannel();
channel.port1.postMessage("ports", [channel2.port1]);
});
</script>
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