gecko-dev/layout/reftests/border-radius/clipping-4-overflow-hidden....

<!DOCTYPE HTML>
<title>Test for clipping of border-radius</title>
<style>
body > div {
  height: 100px;
  width: 200px;
  border-radius: 25px;
  overflow: hidden;
}
body > div > div {
  background: lime;
  height: 100px;
  width: 200px;
}
</style>
<div><div></div></div>