background-image with vendor prefix is flagged as invalid.illegal.css

[oli]

This rule is highlighted as illegal: background-image: -moz-radial-gradient(50% 50.5%, circle farthest-corner, #f1f1f1 0%, #f1f1f1 90%, #ddd 97%, #ccc 98.5%, #aaa 100%); This one isn’t: background: -moz-radial-gradient(50% 50.5%, circle farthest-corner, #f1f1f1 0%, #f1f1f1 90%, #ddd 97%, #ccc 98.5%, #aaa 100%);

thanks for your time

peace - oli