third_party/web_platform_tests/media-source/SourceBuffer-abort.html

<!doctype html>
<html>
<head>
  <meta charset='utf-8'>
  <title>Check the values of appendWindowStart and appendWindowEnd after abort()</title>
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
</head>
<body>
<div id="log"></div>

<script>
var mimes = ['video/webm; codecs="vorbis,vp8"', 'video/mp4'];

mimes.forEach(function(mime) {
    async_test(function() {
        assert_true(MediaSource.isTypeSupported(mime),
                    "Browser doesn't support the MIME used in this test: " + mime);

        var mediaSource = new MediaSource();
        mediaSource.addEventListener('sourceopen', this.step_func_done(function(e) {
            var sourceBuffer = mediaSource.addSourceBuffer(mime);
            sourceBuffer.abort();
            assert_equals(sourceBuffer.appendWindowStart, 0);
            assert_equals(sourceBuffer.appendWindowEnd, Number.POSITIVE_INFINITY);
        }));

        var video = document.createElement('video');
        video.src = window.URL.createObjectURL(mediaSource);
    }, 'SourceBuffer#abort() (' + mime + '): Check the values of appendWindowStart and appendWindowEnd.');
});
</script>
</body>
</html>