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I want to edit a html template to create a simple version for my need. I delete some ; but is there a tool to remove unused classes from CSS or I need to remove the manually?
For example, <div class="something"> is not used in my html; but still I have .something {} in my css file and make my css heavy. Currently, I delete unused classes from CSS one by one manually. I wonder if there is a way to delete any class in CSS which is not referenced in html!
Check out something like http://unused-css.com/. If you pay for it, you get to have it crawl your site and create a clean version for the entire site.
If you want a browser-based solution, try the Firefox plugin
CSS Usage. You can open up Firebug, click on the CSS Usage tab, click on “Autoscan”, then navigate your website a few times (be sure to hit every page). It will keep track of which classes are used and you can export a “cleaned” version. This requires more manual work and may be subject to broken styles, but if you are careful, it should work fine.