Count number of selectors in a css file

IE9 allows only 4095 css selectors, hence we need to know number of css selectors in a file

http://stackoverflow.com/questions/5228459/count-number-of-selectors-in-a-css-file

Also, there are some very good tools like Dust-Me Data (firefox) or CSS Remove and Combine (Chrome) which give a statistics about number of used and unused selectors.