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chromium/third_party/blink/web_tests/external/wpt/webvtt/api/VTTRegion/scroll.html 

<!doctype html>
<title>VTTRegion.scroll</title>
<link rel="help" href="https://w3c.github.io/webvtt/#dom-vttregion-scroll">
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<div id=log></div>
<script>
test(function() {
    var region = new VTTRegion();
    assert_true('scroll' in region, 'scroll is not supported');

    region.scroll = '';
    assert_equals(region.scroll, '');

    region.scroll = 'up';
    assert_equals(region.scroll, 'up');

    region.scroll = 'down';
    assert_equals(region.scroll, 'up');

    region.scroll = '';
    for (var invalid in ['left', 'right', 'center', 'top', 'bottom', 'down']) {
        region.scroll = invalid;
        assert_equals(region.scroll, '');
    }
}, document.title + ' script-created region');
</script>