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Atomic CSS: The Future Is Still Just in Time (JIT) with UnoCSS
4 min readJun 6, 2026

Atomic CSS: The Future Is Still Just in Time (JIT) with UnoCSS

Atomic CSS frameworks like Tailwind have changed how many of us build UIs, but there's a new player on the block: UnoCSS. It's a JIT-first engine that takes the concept of utility-first CSS and cranks up the flexibility and performance.

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