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<html>
<head>
<script>
window.addEventListener('message', async function(evt) {
if (evt.data === 'START') {
var w = window.open('./');
var sw = w.navigator.serviceWorker;
w.close();
w = null;
try {
await sw.register('doesntmatter.js');
} finally {
parent.postMessage('OK', '*');
}
}
});
</script>
</head>
</html>