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<!doctype html>
<title>TextTrackList.getTrackById</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<div id=log></div>
<script>
test(function(){
var video = document.createElement('video');
var track1 = video.addTextTrack('subtitles');
var track2 = video.addTextTrack('subtitles');
assert_equals(track1.id, '');
assert_equals(track2.id, '');
assert_equals(video.textTracks.getTrackById(''), track1);
assert_equals(video.textTracks.getTrackById('fake-id'), null);
});
</script>
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