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<!DOCTYPE HTML>
<html>
<body>
<script type="application/javascript">
var port;
window.addEventListener('message', receiveMessage);
function receiveMessage(evt) {
port = evt.data.port;
port.addEventListener('message', receivePostMessage);
function receivePostMessage(event) {
port.postMessage(event.data);
}
port.start();
window.parent.postMessage({ status: "READY" }, '*');
}
</script>
</body>
</html>