Way to find all unused classes and IDs in HTML

Question

I have many classes and IDs in my long HTML that don't have CSS code associated with them, and it would be tedious to look up each one to see if they are related.

I want to remove all unnecessary classes and IDs. Is there an easy way to do this?

Answer 1

Chrome Developer Tools There is an audit tab that shows unused CSS selectors.

The bad thing though, if I remember correctly, is that you need to run it on every page.