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mincss "Clears the junk out of your CSS" - Peterbe.com
www.peterbe.com/plog/mincss, posted 2013 by peter in css development free python software
mincss (code on github) is a tool that when given a URL (or multiple URLs) downloads that page and all its CSS and compares each and every selector in the CSS and finds out which ones aren't used. The outcome is a copy of the original CSS but with the selectors not found in the document(s) removed.