Reducing Unused CSS
Find and eliminate dead CSS that bloats your stylesheets, using coverage tools, purging, and modular authoring to ship only the rules each page actually uses.
The Cost of Dead CSS
Large frameworks and accumulated styles often ship rules no page uses. Unused CSS inflates download size and parse time, and because CSS is render-blocking, it directly delays first paint.
Measuring Coverage
The DevTools Coverage tab records which CSS bytes actually apply during a session. A high unused percentage signals an opportunity to trim.