I do not seem to be able to apply linear gradients using webkit, the linear-gradient value is not even in Komodo or Dreamweaver. Have they not implemented yet, as I was watching a developer video at WWDC and they seem to be using it.

Code:
.ribbon{
   width:400px;
   height:400px;
   margin:60px auto;
   background-image: -webkit-gradient(linear, 0% 50%, 100% 50%, from(#0099FF), to(#000));
}