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

<!DOCTYPE html>
<title>Cues are properly removed from the active cue list when their track changes mode to disabled</title>
<script src="/common/media.js"></script>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<video>
    <track src="resources/captions-gaps.vtt" kind="captions" default >
    <script>
    async_test(function(t) {
        var video = document.querySelector("video");
        var testTrack = document.querySelector("track");

        video.src = getVideoURI("/media/counting");
        video.oncanplaythrough = t.step_func(startTest);
        video.onseeked = t.step_func_done(seeked);

        function startTest() {
            // Set the mode of the text track to "showing".
            testTrack.track.mode = "showing";
            // Seek to a time with a caption.
            video.currentTime = 1.5;
        }

        function seeked() {
            // Set the mode of the text track to "hidden", then to "showing" again.
            testTrack.track.mode = "hidden";
            testTrack.track.mode = "showing";

            // Set the mode of the text track to "disabled".
            testTrack.track.mode = "disabled";
        }
    });
    </script>
</video>