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chromium/third_party/blink/web_tests/external/wpt/html/semantics/embedded-content/media-elements/track/track-element/track-addtrack-kind.html 

<!DOCTYPE html>
<title>addTextTrack() only accepts known "kind" values</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(function() {
    var trackCount = 0;

    function addTrack(type) {
        video.addTextTrack(type);
        assert_equals(video.textTracks.length, ++trackCount);
    }

    var video = document.createElement("video");
    assert_equals(video.textTracks.length, 0);
    assert_throws_js(TypeError, function() { video.addTextTrack("kaptions"); });
    assert_equals(video.textTracks.length, 0);

    addTrack("subtitles");
    addTrack("captions");
    addTrack("descriptions");
    addTrack("chapters");
    addTrack("metadata");
});
</script>