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chromium/third_party/blink/web_tests/http/tests/media/track/track-webvtt-slow-loading-2.html 

<!DOCTYPE html>
<title>Slow loading WebVTT file interrupted in the middle of a timestamp line.</title>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script>
async_test(function(t) {
    var video = document.createElement("video");
    var track = document.createElement("track");
    video.appendChild(track);

    track.onload = t.step_func_done(function() {
        assert_equals(track.track.cues.length, 2);
        assert_equals(track.track.cues[0].text, "Lorem\u000aipsum");
    });

    track.onerror = t.unreached_func();

    var loadAndStallUrl = "http://127.0.0.1:8000/resources/load-and-stall.php";
    var vttTrackUrl = "?name=../../../media/track/captions-webvtt/captions-multiline-lf.vtt&mimeType=text%2Fvtt";
    track.src = loadAndStallUrl + vttTrackUrl + "&stallAt=32&stallFor=1";
    track.track.mode = "hidden";
});
</script>