speculation-rules/prerender/windowclient-navigate-to-cross-origin-url-on-iframe.https.html

<!--
  This file cannot be upstreamed to WPT until:
  * Cross-origin iframe loading is specified. The test expects that cross-origin
  iframe loading is deferred.
-->
<!DOCTYPE html>
<title>WindowClient.navigate() to cross-origin url in a prerendered iframe</title>
<meta name="timeout" content="long">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/get-host-info.sub.js"></script>
<script src="/common/utils.js"></script>
<script src="/service-workers/service-worker/resources/test-helpers.sub.js"></script>
<script src="../resources/utils.js"></script>
<script src="resources/utils.js"></script>

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

const PAGE_URL = 'resources/windowclient-navigate-on-iframe.html';
const WORKER_URL = 'resources/windowclient-navigate-worker.js';
const SCOPE = 'resources/';
const CROSS_ORIGIN_DESTINATION =
    get_host_info()['HTTPS_REMOTE_ORIGIN'] +
    base_path() + 'resources/empty.html';

promise_test(async t => {
  const uid = token();

  const registration = await service_worker_unregister_and_register(
      t, `${WORKER_URL}?uid=${uid}`, SCOPE);
  t.add_cleanup(() => registration.unregister());
  await wait_for_state(t, registration.installing, 'activated');

  const bc = new PrerenderChannel('test-channel', uid);
  t.add_cleanup(_ => bc.close());

  const gotMessage = new Promise(resolve => {
    bc.addEventListener('message', e => {
      resolve(e.data);
    }, {
      once: true
    });
  });

  // PAGE_URL starts a prerender of a page that makes an iframe, then asks the
  // service worker to navigate the iframe to `navigationUrl` via
  // `WindowClient.navigate(url)`. The cross-origin url triggers
  // PrerenderEventCollector to wait to navigate to `navigationUrl` on an iframe
  // until the prerendered iframe is activated.
  window.open(
      `${PAGE_URL}?navigationUrl=${CROSS_ORIGIN_DESTINATION}&uid=${uid}`,
      '_blank',
      'noopener');

  const navigationResult = await gotMessage;
  const expected = [
    {
      event: 'started waiting navigation on iframe',
      prerendering: true
    },
    {
      event: 'prerendering change',
      prerendering: false
    },
    {
      event: 'finished waiting navigation on iframe',
      prerendering: false
    },
  ];
  assert_equals(navigationResult.length, expected.length);
  for (let i = 0; i < navigationResult.length; i++) {
    assert_equals(navigationResult[i].event, expected[i].event, `event[${i}]`);
    assert_equals(navigationResult[i].prerendering, expected[i].prerendering,
        `prerendering[${i}]`);
  }

  // Send a close signal to PrerenderEventCollector on the prerendered page.
  new PrerenderChannel('close', uid).postMessage('');
}, 'WindowClient.navigate() to a cross-origin URL on a prerendered iframe ' +
   'should be deferred');
</script>