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chromium/third_party/blink/web_tests/external/wpt/css/motion/offset-path-ray-018.html 

<!doctype html>
<meta charset="utf-8">
<title>CSS Motion Path test: ray() path with content-box</title>
<link rel="match" href="offset-path-ray-018-ref.html">
<link rel="help" href="https://drafts.fxtf.org/motion/#ray-function">

<style>
  #outer {
    top: 100px;
    left: 100px;
    position: relative;
    width: 200px;
    height: 200px;
    padding: 50px;
    border: 50px solid black;
  }
  #box {
    background-color: green;
    offset-path: ray(0deg sides at 50% 50%) content-box;
    offset-distance: 100%;
    offset-rotate: 0deg;
    offset-anchor: 0% 0%;
    width: 100px;
    height: 100px;
    background-color: green;
  }
</style>

<div id="outer">
  <div id="box"></div>
</div>