restriction-prompt-by-before-unload.html

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This WPT test may be referenced by the following Test IDs:
- /speculation-rules/prerender/restriction-prompt-by-before-unload.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Prerendering cannot invoke the prompt generated by the

       beforeunload event</title>

<meta name="timeout" content="long">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

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

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

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

<body>

<script>

setup(() => assertSpeculationRulesIsSupported());

promise_test(async t => {

  const uid = token();

  const bc = new PrerenderChannel('prerender-channel', uid);

  t.add_cleanup(_ => bc.close());

  const gotMessage = new Promise(resolve => {

    bc.addEventListener('message', e => {

      resolve(e.data);

    }, {

      once: true

});

});

  // Start prerendering a page that attempts to invoke

  // the prompt generated by the beforeunload event.

  // It is activation-gated and expects to fail.

  startPrerendering(`resources/prompt-by-before-unload.html?uid=${uid}`);

  const result = await gotMessage;

  assert_equals(result,

                'unloaded without the prompt by beforeunload.');

}, 'Prerendering cannot invoke the prompt by the beforeunload event.');

</script>