track-change-event.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-change-event.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>A 'change' event is fired when a TextTrack's mode changes</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script>

async_test(function(t) {

    var video = document.createElement('video');

    var track = video.addTextTrack('subtitles', 'test', 'en');

    // addTextTrack() defaults to "hidden", so settings

    // mode to "showing" should trigger a "change" event.

    track.mode = 'showing';

    assert_equals(video.textTracks.length, 1);

    video.textTracks.onchange = t.step_func_done(function(event) {

        assert_equals(event.target, video.textTracks);

        assert_true(event instanceof Event, 'instanceof');

        assert_false(event.hasOwnProperty('track'), 'unexpected property found: "track"');

});

});

</script>