[chrisbroadfoot]

Seems extremely buggy.

I chose box-shadow, 5px horizontal, 5px vertical, 3px blur, #fff color, and it gave me invalid CSS:

  -webkit-box-shadow: px 3px ;
  -moz-box-shadow: px 3px ;
  box-shadow: px 3px ;

[bgrins]

A couple of sites that have similar functionality:

http://css3please.com http://www.css3maker.com

[user24]

worked fine for me with those settings. Fx 3.6.12 OSX 10.6.4