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<!DOCTYPE html>
<script>
// When told, register an unload handler that will trigger a beacon to the
// URL given by the sender of the message.
window.addEventListener('message', e => {
var url = e.data;
window.addEventListener('unload', () => {
navigator.sendBeacon(url, 'blah');
});
window.parent.postMessage('navigate-away', '*');
});
</script>
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