track-cue-negative-timestamp.html | Explore in Territory

<!DOCTYPE html>
<title>Negative timestamps</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<video>
    <track src="resources/settings.vtt" default>
    <script>
    async_test(function(t) {
        var testTrack = document.querySelector("track");

        testTrack.onload = t.step_func_done(function() {
            var cues = testTrack.track.cues;
            assert_equals(testTrack.track.cues.length, 4);
            // Add cue with negative startTime.
            var cue = new VTTCue(-3439332606, 3.4, "Sausage?");
            testTrack.track.addCue(cue);
            assert_equals(cues.length, 5);

            // Add cue with negative startTime and negative endTime.
            cue = new VTTCue(-110, -3.4, "Pepperoni?");
            testTrack.track.addCue(cue);
            assert_equals(cues.length, 6);

            // Set startTime and endTime to negative values.
            var testCue = cues[2];
            assert_equals(testCue.startTime, 0);
            testCue.startTime = -5;
            assert_equals(testCue.startTime, -5);
            assert_equals(testCue.endTime, 30.5);
            testCue.endTime = -3439332606;
            assert_equals(testCue.endTime, -3439332606);

            // Check negative cues ordering.
            testCue = cues[3];
            assert_equals(testCue.startTime, 31);
            testCue.startTime = -200;
            // Verify that this cue is moved to 2nd position.
            assert_equals(cues[1].startTime, -200);
        });
    });
    </script>
</video>

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