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chromium/third_party/blink/web_tests/external/wpt/css/motion/offset-path-coord-box-001.html 

<!doctype html>
<meta charset="utf-8">
<title>CSS Motion Path test: &lt;coord-box&gt; &lt;border-box&gt;</title>
<link rel="author" title="Daniil Sakhapov" href="[email protected]">
<link rel="match" href="offset-path-coord-box-001-ref.html">
<link rel="help" href="https://drafts.fxtf.org/motion/#valdef-offset-path-coord-box">
<meta name="fuzzy" content="maxDifference=0-100; totalPixels=0-450">

<style>
#outer {
  top: 100px;
  left: 100px;
  position: relative;
  border-radius: 50%;
  border: 10px solid black;
  width: 400px;
  height: 400px;
}
#box {
  background-color: green;
  top: 100px;
  left: 100px;
  position: relative;
  offset-path: border-box;
  offset-distance: 25%;
  width: 100px;
  height: 100px;
}
</style>

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