<!DOCTYPE html>
<html>
<body>
<script src="worker-util.js"></script>
<script>
var worker = new Worker('empty-worker.js');
worker.onmessage = function(event) {
    waitUntilWorkerThreadsExit(function() {
        parent.postMessage("done", "*");
    });
};
</script>
</body>
</html>