track-active-cues.html | Explore in Territory

<!DOCTYPE html>
<title>Ensure that no text track cues are active after the video is unloaded</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 eventCount = 0;

    function eventCallback() {
        eventCount++;
        if (eventCount == 3) {
            assert_equals(trackElement.track.activeCues.length, 1);
            video.src = '';
        }
    }

    var video = document.createElement('video');
    video.src = getVideoURI('/media/movie_5');
    // uanset media element's `show-poster` flag in order to run `time marches on`
    // when we add new cues into media element's cues list.
    video.play();
    var trackElement = document.createElement('track');

    trackElement.onload = t.step_func(eventCallback);
    trackElement.oncuechange = t.step_func(eventCallback);
    video.oncanplaythrough = t.step_func(eventCallback);

    video.onerror = t.step_func_done(function(event) {
        assert_equals(event.target, video);
        assert_not_equals(video.error, null);
        assert_equals(video.error.code, MediaError.MEDIA_ERR_SRC_NOT_SUPPORTED);
        assert_equals(video.networkState, HTMLMediaElement.NETWORK_NO_SOURCE);
        assert_equals(trackElement.track.activeCues.length, 0);
    });

    trackElement.src = 'resources/captions-fast.vtt';
    trackElement.kind = 'captions';
    trackElement.default = true;
    video.appendChild(trackElement);
});
</script>

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