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<!DOCTYPE html>
<meta charset="utf-8">
<title>This will be in an iframe</title>
<script>
window.name = "iframe";
</script>
<body onbeforeunload="return { toString: parent.postMessage.bind(parent, 'PASS', '*') };">
<!-- window.open() uses the entry settings object to determine how the URL will be parsed -->
<button onclick="var w = window.open('open-window.html'); w.onload = () => { parent.onWindowLoaded(w.document.URL); };">This will be clicked</button>