speculation-rules/prerender/restriction-window-open.https.html

<!DOCTYPE html>
<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());

function runTest(test_file, expectation, description) {
  promise_test(async t => {
    const uid = token();
    // Run test in a new window for test isolation.
    window.open(`${test_file}?uid=${uid}`, '_blank', 'noopener');

    // Wait until the prerendered page sends the result.
    const bc = new PrerenderChannel('result', uid);
    t.add_cleanup(() => {
      new PrerenderChannel('close', uid).postMessage('close');
    })
    const result = await new Promise(r => bc.addEventListener('message', e => r(e.data)));
    assert_equals(result, expectation);
  }, description);
}

// Test that a page opens a window during prerendering.
runTest(
    'resources/window-open-during-prerendering.html',
    'failed to open',
    'window.open() should fail during prerendering');

// Test that a page opens a window in the prerenderingchange event.
runTest(
    'resources/window-open-in-prerenderingchange.html',
    'opened',
    'window.open() should succeed in the prerenderingchange event');
</script>