before-unload-inner.html

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<!DOCTYPE html>

<script src="utils.js"></script>

<title>Fenced frame content to report the beforeunload event is not fired</title>

<body>

<script>

window.onload = () => {

  const [before_unload_key] = parseKeylist();

  const url = new URL(location.href);

  const next_url = url.searchParams.get('next_url');

  if (next_url != null) {

    writeValueToServer(

        before_unload_key, 'Loaded the next url in a fenced frame');

    return;

  window.onbeforeunload = () => {

    writeValueToServer(

        before_unload_key, 'The beforeunload event is unexpectely fired.');

};

  location.href =

      generateURL('before-unload-inner.html?next_url', [before_unload_key]);

};

</script>

</body>