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<!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>
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