track-active-cues.html

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This WPT test may be referenced by the following Test IDs:
- /html/semantics/embedded-content/media-elements/track/track-element/track-active-cues.html - WPT Dashboard Interop Dashboard

<!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>