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chromium/third_party/blink/web_tests/external/wpt/html/semantics/embedded-content/media-elements/track/track-element/track-cue-rendering-empty-cue.html 

<!DOCTYPE html>
<title>Empty cues</title>
<script src="/common/media.js"></script>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
async_test(function(t) {
    var video = document.createElement("video");
    video.src = getVideoURI("/media/test");
    video.addTextTrack("captions", "regular captions track", "en");
    video.textTracks[0].addCue(new VTTCue(0, 4, ""));

    video.onplaying = t.step_func_done();
    video.play();
});
</script>