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chromium/third_party/blink/web_tests/external/wpt/html/semantics/embedded-content/media-elements/interfaces/TextTrackCueList/length.html 

<!doctype html>
<title>TextTrackCueList.length</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<div id=log></div>
<script>
setup(function(){
    window.video = document.createElement('video');
    window.t1 = video.addTextTrack('subtitles');
    document.body.appendChild(video);
});
test(function(){
    var cues = t1.cues;
    assert_equals(cues.length, 0);
    var c1 = new VTTCue(0, 1, 'text1');
    t1.addCue(c1);
    assert_equals(cues.length, 1);
    t1.removeCue(c1);
    assert_equals(cues.length, 0);
});

</script>