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chromium/third_party/blink/web_tests/media/track/track-css-is-pseudo.html 

<!DOCTYPE html>
<title>Test that the :is() pseudo-class works in ::cue()</title>
<script src="../media-controls.js"></script>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<style>
video::cue { color: green; }
video::cue(:is(.red, .red2)) { color: red; }
</style>
<video>
    <track src="captions-webvtt/styling.vtt" kind="captions" default>
</video>
<script>
async_test(function(t) {
    var video = document.querySelector("video");
    video.src = "../content/test.ogv";

    video.onseeked = t.step_func_done(function() {
        var cueNode = textTrackCueElementByIndex(video, 0).firstChild.firstElementChild;
        var cueStyle = getComputedStyle(cueNode);
        assert_equals(cueStyle.color, "rgb(255, 0, 0)");

        cueNode = cueNode.nextElementSibling;
        cueStyle = getComputedStyle(cueNode);
        assert_equals(cueStyle.color, "rgb(0, 128, 0)");

        cueNode = cueNode.nextElementSibling;
        cueStyle = getComputedStyle(cueNode);
        assert_equals(cueStyle.color, "rgb(255, 0, 0)");
    });

    video.currentTime = 0.3;
});

</script>