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<!DOCTYPE HTML>
<html>
<body>
<script type="application/javascript">
function ok(what, msg) {
window.parent.postMessage({type: what ? 'OK' : 'KO', msg }, '*');
}
window.addEventListener('message', receiveMessage);
function receiveMessage(evt) {
ok(evt.ports.length == 1, "Port transferred!");
var a = new MessageChannel();
ok(a, "MessageChannel created");
evt.ports[0].postMessage('hello world!', [a.port2]);
a.port1.onmessage = function(event) {
event.target.postMessage(event.data);
}
}
</script>
</body>
</html>