unused css

Unused

I recently wrote Here’s the thing about "unused CSS" tools, where I tried to enumerate all the challenges any tool would have in finding truly "unused" CSS. The overarching idea is that CSS selectors match elements in the DOM, and those elements in the DOM come from all sorts of places: your static templates, dynamic templates based on server-side state, and of course, JavaScript, which can manipulate the DOM in any way at all, including pull things from APIs and third parties.

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Here’s the thing about “unused CSS” tools

There are a lot of tools that aim to help you remove "unused CSS" from your project. Never a week goes by that I don't see a tool for this being shared or promoted. It must strike some kind of perfect chord for some developers. I care about performance, and I know that reducing file sizes is good for performance. Indeed, it is. I bet we have CSS that is unused in our stylesheets, if we removed that, that's a performance win. Yep, it would be. We should automate that. Ehhhhhh, I'm not so sure.

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