chromium/third_party/blink/web_tests/compositing/video/video-reflection.html

<!DOCTYPE html>
<title>Test "-webkit-box-reflect" property on a video element.</title>
<style>
video {
    -webkit-box-reflect: below 0px;
    border: 3px solid red;
}
</style>
<video></video>
<script>
if (window.testRunner)
    testRunner.waitUntilDone();

var video = document.querySelector('video');
video.onseeked = function() {
    video.onseeked = null;
    if (window.testRunner)
        testRunner.notifyDone();
};

video.src = '../../media/content/test.ogv';
video.currentTime = 1;
</script>