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chromium/third_party/blink/web_tests/external/wpt/speculation-rules/prerender/resources/media-devices-access.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-{camera, microphone}.https.html) loads
// the initiator page, then the initiator page will prerender itself with the
// `prerendering` parameter.
const isPrerendering = params.has('prerendering');

if (!isPrerendering) {
  const rule_extras = {'target_hint': getTargetHint()};
  loadInitiatorPage();
} else {
  const prerenderEventCollector = new PrerenderEventCollector();
  const promise = navigator.mediaDevices.getUserMedia({
      audio: params.get("audio") === "true",
      video: params.get("video") === "true"
  });
  prerenderEventCollector.start(promise, 'navigator.mediaDevices.getUserMedia');
}

</script>