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Test Info:

<!DOCTYPE html>
<title>Access to the setSinkId of the Audio API is deferred</title>
<meta name="variant" content="?target_hint=_self">
<meta name="variant" content="?target_hint=_blank">
<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="../resources/utils.js"></script>
<script src="resources/utils.js"></script>
setup(() => assertSpeculationRulesIsSupported());
promise_test(async t => {
const uid = token();
const bc = new PrerenderChannel('test-channel', uid);
t.add_cleanup(_ => bc.close());
const gotMessage = new Promise(resolve => {
bc.addEventListener('message', e => {
}, {
once: true
const url = `resources/audio-setSinkId.https.html?sinkId=default&uid=${uid}&target_hint=${getTargetHint()}`;, '_blank', 'noopener');
const result = await gotMessage;
const expected = [
event: 'started waiting Audio.setSinkId',
prerendering: true
event: 'prerendering change',
prerendering: false
event: 'finished waiting Audio.setSinkId',
prerendering: false
// mentions selectAudioOutput() but this test uses setSinkId() function.
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('');
}, `the access to the setSinkId of Audio API should be deferred until the
prerendered page is activated`);