gecko-dev/layout/reftests/css-gradients/linear-zero-length-1c.html

<div style="background: -moz-linear-gradient(center, white, black 50%); width: 300px; height: 300px;"></div>
<div style="background: -moz-repeating-linear-gradient(center, white, black 50%); width: 300px; height: 300px;"></div>