Detect Unmatched CSS Selectors with Helium
Start by including the script in your page and initializing Helium upon load:
As soon as the page is loaded, the developer is presented with a textarea with which they may type page URLs to test. These pages are then loaded and a report is generated, detailing the unused selectors, malformed selectors, and pseudo-selectors which should be tested manually:
Helium is an excellent tool for identifying legacy and unnecessary CSS. The information provided by Helium allows developers to remove unused CSS or better segment site CSS. This tool is the perfect utility for developers looking to quickly optimize their CSS code. In fact, I've not seen a tool so easy to implement and use. Let me know if you agree!
Did you know about mincss, written by our own Peterbe? It seem to serve the same purpose, see http://www.peterbe.com/plog/mincss