<html>
<head>
<script>
try {
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	worker.port.onmessage = function(event) {
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		document.close();
		window.parent.postMessage(event.data, '*');
	}
	worker.port.start();
	worker.port.postMessage('Connection test');
} catch (exception) {
	window.parent.postMessage(exception.name, '*');
	document.write(exception.name);
	document.close();
}
</script>
</head>
<body>
</body>
</html>