Linear gradient syntax

linear-gradient.css

section.linear-gradient {
   background-color: #333333;
   background-image: -webkit-gradient(linear, left top, left bottom, from(#333333), to(#999999)); /* Saf4+, Chrome */
   background-image: -webkit-linear-gradient(top, #333333, #999999); /* Chrome 10+, Saf5.1+, iOS 5+ */
   background-image:    -moz-linear-gradient(top, #333333, #999999); /* FF3.6+ */
   background-image:     -ms-linear-gradient(top, #333333, #999999); /* IE10 */
   background-image:      -o-linear-gradient(top, #333333, #999999); /* Opera 11.10+ */
   background-image:         linear-gradient(to bottom, #333333, #999999);
}