Is there an advanced CSS minifier/compiler that does things like strip redundancy and comma separate identical rules?

Question

For example

input{margin:0}body{margin:0;background:white}

would be shorter written like this

input,body{margin:0}body{back         


        

Answer 1

Ther are several out there. Some of the best ones are;

http://refresh-sf.com/yui/

http://www.minifycss.com/css-compressor/

The second one groups rules that match together also and more.