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

<!doctype html>
<title>TextTrackList getter</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');
    video.addTextTrack('subtitles', 'b');
    window.track = document.createElement('track');
    track.label = 'a';
    video.appendChild(track);
    video.addTextTrack('subtitles', 'c');
});
test(function(){
    assert_equals(video.textTracks[0].label, 'a');
    assert_equals(video.textTracks[1].label, 'b');
    assert_equals(video.textTracks[2].label, 'c');
});
test(function(){
    var track_before = video.textTracks[0];
    video.textTracks[0] = 'foo';
    assert_equals(video.textTracks[0], track_before);
}, document.title+', no indexed set/create');
test(function(){
    'use strict';
    var track_before = video.textTracks[0];
    assert_throws_js(TypeError, function(){ video.textTracks[0] = 'foo'; });
    assert_equals(video.textTracks[0], track_before);
}, document.title+', no indexed set/create (strict)');

</script>