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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/

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

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.

<div style=""> Perfectly attached!