gecko-dev/layout/reftests/box-shadow/boxshadow-rounded-spread-ref.html

<div style="width: 300px; height: 300px; border-radius: 100%; position: absolute; top: 20px; left: 20px;">shadow div</div><div style="border-radius: 100%; width: 320px; height: 320px; background-color: grey; position: absolute; top: 330px; left: 30px;">&nbsp;</div>