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It’s a real shame that folk a decade ago weren’t warning developers against utterly insane things like CSS-in-J — oh.

GitHub@github.com

GitHub.com has fully moved off CSS-in-JS to CSS Modules, resulting in 55% less server-side render time and 25% faster component init. https://github.blog/engineering/architecture-optimization/improving-site-performance-by-shipping-more-css/

github.blogImproving site performance by shipping more CSSHow we fully migrated github.com away from CSS-in-JS.

Noam Rosenthal

@nomster.bsky.social

I think folk were but it was dismissed as "oh you're a use-the-platform boomer" alongside other unpopular preaching.

Noam Rosenthal

@nomster.bsky.social

Also a decade ago the alternative (native CSS) was missing a lot of features.

Harry Roberts

@csswizardry.com

and yes!

7/10/26, 2:19 pm0 reposts2 likes

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