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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.

toni / link

@linkplay.space

good that we all agree now that CSS-in-JS was a mistake 💆

Andreas Møller

@andreasmoller.dk

Yes but unfortunately many people still don’t recognise that the problem it was meant to solve is still relevant.

what problem though?

Attaching styles to html elements. We don’t really have a good way to do that today. CSS modules are ok, but you still have to create two files just to make a button. Vue and Svelte are much better, but there isn’t an equivalent for React to my knowledge.

4/10/26, 2:28 pm0 reposts4 likes

k0bin.bsky.social

@k0bin.bsky.social

<div style=""> Perfectly attached!

Andreas Møller

@andreasmoller.dk

Yes, pretty much, If inline style supported &:hover.

Martin

@chaosmonster.bsky.social

Check out @lit.dev they solved it too

Justin Fagnani

@justinfagnani.com

And it's fast, simple, & forward compatible with new CSS features because it's just CSS: 1. Write CSS in a css`...` tag 2. A small helper creates a constructible stylesheet from it 3. New element instances attach the stylesheet to their shadow roots Fully compatible with native CSS modules too.