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chromium/third_party/blink/web_tests/fast/mediacapturefromelement/CanvasCaptureMediaStream-clone-track.html 

<!DOCTYPE html>
<script src=../../resources/testharness.js></script>
<script src=../../resources/testharnessreport.js></script>
<script>
// This test verifies that MediaStream can be created with captureStream() call.
test(function() {
  var canvas = document.createElement('canvas');
  var stream = canvas.captureStream();
  assert_not_equals(stream, null);
  assert_equals(stream.active, true);
  assert_equals(stream.getVideoTracks().length, 1);
  assert_equals(stream.getAudioTracks().length, 0);
  var track = stream.getVideoTracks()[0];
  assert_equals(track.readyState, 'live');
  assert_equals(track.enabled, true);
  assert_equals(track.muted, false);
  var cloned_track = track.clone();
  assert_equals(track.readyState, 'live');
  assert_equals(track.enabled, true);
  assert_equals(track.muted, false);
  assert_equals(cloned_track.readyState, 'live');
  assert_equals(cloned_track.enabled, true);
  assert_equals(cloned_track.muted, false);
  track.stop();
  assert_equals(cloned_track.enabled, true);
  var canvas = cloned_track.canvas;
  assert_not_equals(stream, null);
  cloned_track.requestFrame();
}, 'check clone track after captureStream()');

</script>