speculation-rules/prerender/resources/audio-setSinkId.https.html

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/speculation-rules/prerender/resources/utils.js"></script>
<script src="/speculation-rules/prerender/resources/deferred-promise-utils.js"></script>
<audio controls id="beat" src="./bear-av1-opus.mp4" loop></audio>
<script>

// The main test page (restriction-audio-setSinkId.https.html) loads the
// initiator page, then the initiator page will prerender itself with the
// `prerendering` parameter.
const params = new URLSearchParams(location.search);
const isPrerendering = params.has('prerendering');

if (!isPrerendering) {
  const rule_extras = {'target_hint': getTargetHint()};
  loadInitiatorPage(rule_extras);
} else {
  const prerenderEventCollector = new PrerenderEventCollector();

  const promise = beat.setSinkId(
      params.get('sinkId') === 'invalid' ? 'fakeId' : '');
  // The spec, https://wicg.github.io/nav-speculation/prerendering.html#audio-output-patch,
  // mentions selectAudioOutput() but this test uses setSinkId() function.
  prerenderEventCollector.start(promise, 'Audio.setSinkId');
}
</script>