media-capabilities-encoding-info.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-media-capabilities-encoding-info.https.html)
// loads the initiator page then the initiator page will prerender itself with
// the `prerendering` parameter.
const isPrerendering = params.has('prerendering');

// These configurations are copied from
// wpt/media-capabilities/encodingInfo.webrtc.html
const minimalVideoConfiguration = {
  contentType: 'video/VP9; profile-level="0"',
  width: 800,
  height: 600,
  bitrate: 3000,
  framerate: 24,
};

const minimalAudioConfiguration = {
  contentType: 'audio/opus',
};

const configuration = {
  type: 'webrtc',
  video: minimalVideoConfiguration,
  audio: minimalAudioConfiguration,
};

if (!isPrerendering) {
  loadInitiatorPage();
} else {
  const prerenderEventCollector = new PrerenderEventCollector();
  prerenderEventCollector.start(
      navigator.mediaCapabilities.encodingInfo(configuration), 'navigator.mediaCapabilities.encodingInfo');
}

</script>

chromium/third_party/blink/web_tests/external/wpt/speculation-rules/prerender/resources/media-capabilities-encoding-info.https.html