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Test Info:

<!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>
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 => {
}, {
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.
const result = await gotMessage;
'unloaded without the prompt by beforeunload.');
}, 'Prerendering cannot invoke the prompt by the beforeunload event.');