linear gradients fail to parse

[chriseppstein]

Error: 'Error parsing shorthand property background: -webkit-linear-gradient(top, #f5f5f5, #f1f1f1). invalid syntax at line 1 col 2:

  -webkit-linear-gradient(top, #f5f5f5, #f1f1f1)
   ^
Unexpected "w"

Error: 'Error parsing shorthand property background: linear-gradient(to top, #f5f5f5, #f1f1f1). invalid syntax at line 1 col 17:

  linear-gradient(to top, #f5f5f5, #f1f1f1)
                  ^
Unexpected "t"