<!DOCTYPE HTML>
<title>Test for clipping of border-radius</title>
<style>
body > div {
  overflow: hidden;
  width: 200px;
  height: 100px;
  border-radius: 50px / 20px;
}
body > div > div {
  border-radius: 20px / 40px;
  overflow: hidden;
  width: 200px;
  height: 100px;
  background: lime;
}
</style>
<div><div></div></div>