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<!DOCTYPE html>
<h1>I'll report to my parent when I'm unloaded</h1>
<script>
window.onbeforeunload = e => {
parent.postMessage('unloading', '*');
};
</script>
<!DOCTYPE html>
<h1>I'll report to my parent when I'm unloaded</h1>
<script>
window.onbeforeunload = e => {
parent.postMessage('unloading', '*');
};
</script>