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Test Info:

<!DOCTYPE html>
<title>postMessage() between service worker and prerendered page</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="/service-workers/service-worker/resources/test-helpers.sub.js"></script>
<script src="../resources/utils.js"></script>
<script src="resources/utils.js"></script>
setup(() => assertSpeculationRulesIsSupported());
const uid = token();
const PAGE_URL = `resources/postmessage-to-service-worker.html?uid=${uid}`;
const WORKER_URL = 'resources/postmessage-to-client-worker.js';
// Message sequence: prerendered page => service worker => prerendered page =>
// main page
promise_test(async t => {
const registration =
await service_worker_unregister_and_register(t, WORKER_URL, PAGE_URL);
t.add_cleanup(() => registration.unregister());
await wait_for_state(t, registration.installing, 'activated');
const bc = new PrerenderChannel('test-channel', uid);
t.add_cleanup(_ => bc.close());
const gotMessage = new Promise(resolve => {
bc.addEventListener('message', e => {
}, {
once: true
});, '_blank', 'noopener');
const result = await gotMessage;
const expected = [
{event: 'started waiting ServiceWorker.postMessage', prerendering: true},
{event: 'prerendering change', prerendering: false},
{event: 'postmessage to client', prerendering: false},
{event: 'finished waiting ServiceWorker.postMessage', prerendering: false},
assert_equals(result.length, expected.length);
for (let i = 0; i < result.length; i++) {
assert_equals(result[i].event, expected[i].event, `event[${i}]`);
assert_equals(result[i].prerendering, expected[i].prerendering,
// Send a close signal to PrerenderEventCollector on the prerendered page.
new PrerenderChannel('close', uid).postMessage('');
}, 'ServiceWorker#postMessage() from a prerendered page should be deferred ' +
'until page activation.');