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<!DOCTYPE HTML>
<html>
<body>
<script type="application/javascript">
function ok(a, msg) {
window.parent.postMessage({ status: a ? "OK" : "KO", message: msg }, "*");
}
window.addEventListener('message', receiveMessage);
function receiveMessage(evt) {
ok (evt.data, "Data received");
ok (evt.data.port instanceof MessagePort, "Data contains a MessagePort");
var a = new MessageChannel();
window.parent.postMessage({ status: "FINISH", port: a.port2 }, '*', [a.port2]);
}
</script>
</body>
</html>