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Test Info:

<!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 -->
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 => {
}, {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'] +
// 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;
}, [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 " +