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chromium/third_party/blink/web_tests/external/wpt/html/semantics/embedded-content/media-elements/track/track-element/track-selection-metadata.html 

<!DOCTYPE html>
<title>Multiple 'metadata' tracks with 'default'</title>
<script src="/common/media.js"></script>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<video>
    <track kind="metadata" src="resources/default-styles.vtt" id="t1">
    <track kind="metadata" src="resources/class.vtt" default id="t2hidden">
    <track kind="metadata" src="resources/metadata-area.vtt" id="t3">
    <track kind="metadata" src="resources/webvtt-file.vtt" default id="t4hidden">
</video>
<script>
async_test(function() {
    var video = document.querySelector('video');
    video.onloadstart = this.step_func_done(function() {
        assert_equals(video.textTracks.length, 4);
        for (var track of video.textTracks) {
            assert_equals(track.kind, 'metadata');

            var trackElement = document.getElementById(track.id);
            if (track.id.indexOf('hidden') != -1) {
                assert_true(trackElement.default);
                assert_equals(track.mode, 'hidden');
            } else {
                assert_false(trackElement.default);
                assert_equals(track.mode, 'disabled');
            }
        }
    });

    video.src = getVideoURI("/media/test");
});
</script>