speculation-rules/prerender/resources/encrypted-media.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>
<script>
const params = new URLSearchParams(location.search);

// The main test page (restriction-encrypted-media*.https.html) loads the
// initiator page, then the initiator page will prerender itself with the
// `prerendering` parameter.
const isPrerendering = params.has('prerendering');

if (!isPrerendering) {
  loadInitiatorPage();
} else {
  const prerenderEventCollector = new PrerenderEventCollector();

  const config = [{
      initDataTypes:  ['keyids', 'webm' ,'cenc'],
      audioCapabilities: [
        {contentType: 'audio/mp4; codecs="mp4a.40.2"'},
        {contentType: 'audio/webm; codecs="opus"'}
      ]
  }];

  const fakeConfig = [{
      initDataTypes: ['fakeidt'],
      audioCapabilities: [{contentType: 'audio/fake; codecs="mp4a.40.2"'}]
  }];

  const promise =
      navigator.requestMediaKeySystemAccess('org.w3.clearkey',
          params.get('config') === 'support' ? config : fakeConfig);
  prerenderEventCollector.start(
      promise, 'navigator.requestMediaKeySystemAccess');
}

</script>