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chromium/third_party/blink/web_tests/external/wpt/html/semantics/embedded-content/media-elements/interfaces/HTMLElement/HTMLTrackElement/track.html 

<!doctype html>
<title>HTMLTrackElement.track</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<div id=log></div>
<script>
test(function(){
    var track = document.createElement('track');
    assert_equals(track.track, track.track, 'same object should be returned');
    assert_true(track.track instanceof TextTrack, 'returned object should be a TextTrack');
});
</script>