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

<!doctype html>
<title>TextTrack.oncuechange</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<div id=log></div>
<script>
setup(function(){
    window.video = document.createElement('video');
    window.t1 = video.addTextTrack('subtitles');
    window.ev = new Event('cuechange');
    window.ran = false;
    window.cb = function() { ran = true; };
});
test(function(){
    assert_equals(t1.oncuechange, null);
    t1.oncuechange = cb;
    t1.dispatchEvent(ev);
    assert_true(ran);
    t1.oncuechange = null;
    ran = false;
    t1.dispatchEvent(ev);
    assert_false(ran);
});
test(function(){
    t1.addEventListener('cuechange', cb, false);
    t1.dispatchEvent(ev);
    assert_true(ran);
    t1.removeEventListener('cuechange', cb, false);
    ran = false;
    t1.dispatchEvent(ev);
    assert_false(ran);
}, 'TextTrack.addEventListener/removeEventListener');
</script>