workers-in-cross-origin-iframe.html

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This WPT test may be referenced by the following Test IDs:
- /speculation-rules/prerender/workers-in-cross-origin-iframe.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Construction of Web Workers in cross-origin iframe is deferred</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="/common/dispatcher/dispatcher.js"></script>

<script src="../resources/utils.js"></script>

<script src="resources/utils.js"></script>

<!-- This is a regression test for https://crbug.com/1424250 -->

<body>

<script>

setup(() => assertSpeculationRulesIsSupported());

promise_test(async t => {

  const uid = token();

  const bc = new PrerenderChannel('test-channel', uid);

  const gotMessage = new Promise(resolve => {

    bc.addEventListener('message', e => {

      resolve(e.data);

    }, {once: true});

});

  // This cross-origin iframe starts a dedicated worker and sends a message to

  // this document once loading the worker is completed.

  const crossOriginUrl =

      new URL(`resources/workers-in-cross-origin-iframe.html?uid=${uid}`,

              get_host_info()['HTTPS_REMOTE_ORIGIN'] +

                  window.location.pathname);

  // Start prerendering. Loading the cross-origin iframe in a prerendered page

  // will be deferred until prerender activation.

  const {exec, activate} = await create_prerendered_page(t);

  await exec(crossOriginUrl => {

    const iframe = document.createElement('iframe');

    iframe.src = crossOriginUrl;

    document.body.appendChild(iframe);

  }, [crossOriginUrl.href]);

  // Activate. This resumes loading the cross-origin iframe.

  await activate();

  // Wait for the completion of the worker creation.

  assert_equals(await gotMessage, 'Success');

}, "Dedicated workers in cross-origin iframe should be loaded after " +

   "activation");

</script>