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

<!DOCTYPE html>
<title>Very large timestamp is parsed correctly</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<video>
    <track src="resources/large-timestamp.vtt" default>
    <script>
    async_test(function(t) {
        var testTrack = document.querySelector("track");
        testTrack.onload = t.step_func_done(function() {
            assert_equals(testTrack.track.cues.length, 1);
            var cue = testTrack.track.cues[0];
            assert_equals(parseInt(cue.id), 1);
            assert_equals(cue.startTime / 3600, 1234567);
            assert_equals(cue.endTime / 3600, 1234567890);
        });
    });
    </script>
</video>