speculation-rules/prerender/visibility-state.https.html

<!DOCTYPE html>
<title>visibilityState must be updated after prerendering</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="/common/dispatcher/dispatcher.js"></script>
<script src="/html/browsers/browsing-the-web/remote-context-helper/resources/remote-context-helper.js"></script>
<script src="../resources/utils.js"></script>
<script src="resources/utils.js"></script>

<body>
<script>
setup(() => assertSpeculationRulesIsSupported());

promise_test(async t => {
  const rcHelper = new PrerenderingRemoteContextHelper();
  const referrerRC = await rcHelper.addWindow(undefined, { features: 'noopener' });
  const prerenderedRC = await referrerRC.addPrerender();

  assert_equals(await prerenderedRC.executeScript(() => document.visibilityState), "hidden");

  await referrerRC.navigateExpectingPrerenderingActivation(prerenderedRC);

  assert_equals(await prerenderedRC.executeScript(() => document.visibilityState), "visible");
});
</script>