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<!DOCTYPE html>
<title>addTextTrack() only accepts known "kind" values</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(function() {
var trackCount = 0;
function addTrack(type) {
video.addTextTrack(type);
assert_equals(video.textTracks.length, ++trackCount);
}
var video = document.createElement("video");
assert_equals(video.textTracks.length, 0);
assert_throws_js(TypeError, function() { video.addTextTrack("kaptions"); });
assert_equals(video.textTracks.length, 0);
addTrack("subtitles");
addTrack("captions");
addTrack("descriptions");
addTrack("chapters");
addTrack("metadata");
});
</script>
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