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Test Info:

<!DOCTYPE html>
<meta charset="utf-8">
<title>Beforeunload must be gated behind sticky activation: nested browsing context</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<p>If you happen to be running this test as a human, then be sure not to interact with any part of the page; that would invalidate the results!
<script>
setup({ single_test: true });
const iframe = document.createElement('iframe');
iframe.src = 'support/beforeunload-sticky-start.html';
window.onmessage = e => {
assert_equals(e.data, 'navigated successfully');
const desiredURL = (new URL('support/beforeunload-sticky-destination.html', location.href)).href;
assert_equals(iframe.contentWindow.location.href, desiredURL);
done();
};
document.body.append(iframe);
</script>