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chromium/third_party/blink/web_tests/external/wpt/html/semantics/embedded-content/media-elements/interfaces/TrackEvent/constructor.html 

<!doctype html>
<title>TrackEvent constructor</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<div id=log></div>
<script>
test(function(){
    var ev = new TrackEvent('foo');
    assert_true(ev instanceof TrackEvent, 'ev instanceof TrackEvent');
    assert_true(ev instanceof Event, 'ev instanceof Event');
    assert_equals(ev.track, null, 'ev.track');
    ev.track = {};
    assert_equals(ev.track, null, 'ev.track after assignment');
}, document.title+', one arg');
test(function(){
    var video = document.createElement('video');
    var testTrack = video.addTextTrack('subtitles', 'foo', 'foo');
    var ev = new TrackEvent('foo', {track: testTrack});
    assert_true(ev instanceof TrackEvent, 'ev instanceof TrackEvent');
    assert_true(ev instanceof Event, 'ev instanceof Event');
    assert_equals(ev.track, testTrack, 'ev.track');
    ev.track = {};
    assert_equals(ev.track, testTrack, 'ev.track after assignment');
}, document.title+', two args');
</script>