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chromium/third_party/blink/web_tests/external/wpt/html/semantics/embedded-content/media-elements/track/track-element/track-load-error-readyState.html 

<!DOCTYPE html>
<title>Error event on HTMLTrackElement and ERROR readyState on TextTrack</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<video>
  <track src="junk" default>
  <script>
  async_test(function(t) {
    var track = document.querySelector("track");
    track.onerror = t.step_func_done(function() {
      assert_equals(track.readyState, HTMLTrackElement.ERROR);
    });
  });
  </script>
</video>