css/motion/offset-path-shape-rect-003.html

<!doctype html>
<meta charset="utf-8">
<title>CSS Motion Path test: offset-path:rect() path with explicit arguments and padding-box</title>
<link rel="match" href="offset-path-shape-rect-003-ref.html">
<link rel="help" href="https://drafts.fxtf.org/motion/#valdef-offset-path-basic-shape">
<link rel="help" href="https://drafts.csswg.org/css-shapes-1/#funcdef-basic-shape-rect">

<style>
#outer {
  top: 100px;
  left: 100px;
  position: relative;
  width: 200px;
  height: 100px;
  padding: 50px;
  border: 50px solid black;
}
#box {
  background-color: green;
  position: relative;
  offset-path: rect(auto auto 50% 10px) padding-box;
  offset-distance: 40%;
  border-radius: 50% 50% 0 0;
  width: 100px;
  height: 100px;
}
</style>

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