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chromium/third_party/blink/web_tests/external/wpt/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/text-decoration_underline-ref.html 

<!DOCTYPE html>
<title>Reference for WebVTT rendering, ::cue(), text-decoration: underline</title>
<style>
html { overflow:hidden }
body { margin:0 }
.video {
    display: inline-block;
    width: 320px;
    height: 180px;
    position: relative;
    font-size: 9px;
}
.cue {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    text-align: center
}
.cue > span {
    font-family: sans-serif;
    background: rgba(0,0,0,0.8);
    color: white;
    text-decoration: underline;
}
</style>
<div class="video"><span class="cue"><span>This is a test subtitle</span></span></div>