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chromium/third_party/blink/web_tests/external/wpt/html/semantics/embedded-content/media-elements/track/track-element/track-webvtt-magic-header.html 

<!DOCTYPE html>
<title>Magic file header "WEBVTT" leads to the file properly recognized as a WebVTT file</title>
<script src="track-helpers.js"></script>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<video>
    <track src="resources/webvtt-file.vtt">
    <track src="resources/webvtt-rubbish.vtt">
    <track src="resources/no-webvtt.vtt">
</video>
<script>
async_test(function(t) {
    var video = document.querySelector("video");

    var trackElements = document.querySelectorAll("track");
    trackElements[0].onload = t.step_func(trackLoaded);
    trackElements[1].onload = t.step_func(trackLoaded);
    trackElements[2].onerror = t.step_func(trackLoaded);

    enableAllTextTracks(video.textTracks);

    var numberOfTracksLoaded = 0;
    function trackLoaded() {
        numberOfTracksLoaded++;
        if (numberOfTracksLoaded != 3)
            return;

        testTrack(0);
        testTrack(1);
        testTrackError(2);
        t.done();
    }

    function testTrack(index) {
        var expected = [
            {
                id : "1",
                startTime : 0,
                endTime : 30.5,
                text : "Bear is Coming!!!!!"
            },
            {
                id : "2",
                startTime : 31,
                endTime : 1200.5,
                text : "I said Bear is coming!!!!"
            }
        ];

        assert_cues_equal(video.textTracks[index].cues, expected);
    }

    function testTrackError(index) {
        assert_cues_equal(video.textTracks[index].cues, []);
    }
});
</script>