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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) {
if (evt.data.type == 'PORT') {
var port = evt.data.port;
var counter = 0;
port.onmessage = function(event) {
if (counter++ == 0) {
ok(!(event.data % 2), "The number " + event.data + " has been received correctly by the iframe");
window.parent.postMessage({ type: 'PORT', port }, '*', [port]);
}
else {
ok(false, "Wrong message!");
}
}
} else {
ok(false, "Unknown message");
}
}
</script>
</body>
</html>