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chromium/third_party/blink/web_tests/external/wpt/css/CSS2/normal-flow/video-paint-order.html 

<!DOCTYPE html>
<title>Video paint order</title>
<link rel="author" title="Philip Rogers" href="[email protected]">
<link rel="help" href="https://www.w3.org/TR/CSS2/zindex.html">
<link rel="match" href="video-paint-order-ref.html">
<style>
  video {
    background: red;
    width: 95px;
    height: 95px;
  }
  #negative-margin {
    display: inline-block;
    width: 100px;
    height: 100px;
    background: green;
    margin-left: -100px;
  }
</style>
<video></video>
<!-- #negative-margin should paint fully on top of the video. -->
<div id="negative-margin"></div>