Silvestar Bistrović defines what it means to “audit CSS.” Then he digs deep into Chrome DevTools, which you can use to troubleshoot and monitor a variety of different things. Even if you are familiar with Dev Tools, this is worth a read — there’s likely something here you’ve missed.
Among the items Silvestar mentions are the Specificity Visualizer that shows the specificity of CSS selectors in the codebase, the CSS Specificity Graph Generator, CSS Stats, and Project Wallace which allows you to “see previous states of your CSS code base and see how your code changes between states.” 👍