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chromium/third_party/blink/web_tests/external/wpt/webrtc/simulcast/basic.https.html 

<!doctype html>
<meta charset=utf-8>
<title>RTCPeerConnection Simulcast Tests</title>
<meta name="timeout" content="long">
<script src="../third_party/sdp/sdp.js"></script>
<script src="simulcast.js"></script>
<script src="../RTCPeerConnection-helper.js"></script>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="../../mediacapture-streams/permission-helper.js"></script>
<script>
promise_test(async t => {
  const rids = [0, 1];
  const pc1 = new RTCPeerConnection();
  t.add_cleanup(() => pc1.close());
  const pc2 = new RTCPeerConnection();
  t.add_cleanup(() => pc2.close());

  return negotiateSimulcastAndWaitForVideo(t, rids, pc1, pc2);
}, 'Basic simulcast setup with two spatial layers');
</script>