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<!doctype html>
<title>message channel as ports</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();
postMessage('', '*', [channel.port1, channel.port2]);
onmessage = t.step_func(function(e) {
assert_equals(e.ports.length, 2);
t.done();
});
}, "MessageChannel's ports as MessagePort objects");
test(() => {
var channel = new MessageChannel();
channel[0] = channel.port1;
channel[1] = channel.port2;
channel.length = 2;
assert_throws_js(TypeError,
() => { postMessage('', '*', channel) },
'Old-style WebIDL arrays must throw a type error');
}, "Old-style array objects");
</script>
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