html - How can I find unused images and CSS styles in a website?

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Answer 1

You don't have to pay any web service or search for an addon, you already have this in Google Chrome under F12 (Inspector)->Audits->Remove unused CSS rules

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Update: 30 Jun, 2017

Now Chrome 59 provides CSS and JS code coverage. See https://developers.google.com/web/updates/2017/04/devtools-release-notes#coverage