gecko-dev/layout/reftests/css-gradients/radial-zero-length-1b.html

<div style="background: radial-gradient(circle closest-side at left, red, white 100px, black); width: 300px; height: 300px;"></div>
<div style="background: repeating-radial-gradient(closest-side circle at left, red, white 100px, black); width: 300px; height: 300px;"></div>