enable_controls_reposition-ref.html

<!DOCTYPE html>
<title>Reference for WebVTT rendering, cue reposition after enabling controls</title>
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
<style>
.video {
    display: inline-block;
    outline: solid;
    width: 320px;
    height: 240px;
    position: relative
}
video {
    position: absolute;
    width:320px;
    height:240px;
}
.cue {
    position: absolute;
    bottom: 50px;
    left: 0;
    right: 0;
    text-align: center
}
.cue > span {
    font-family: Ahem, sans-serif;
    background: rgba(0,0,0,0.8);
    color: green;
    font-size: 50px;
}
</style>
<video controls>
    <source src="/media/white.webm" type="video/webm">
    <source src="/media/white.mp4" type="video/mp4">
</video>
<div class="video"><span class="cue"><span>Foo</span></span></div>

chromium/third_party/blink/web_tests/external/wpt/webvtt/rendering/cues-with-video/processing-model/enable_controls_reposition-ref.html