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Tailwind CSS v4 Rewrites Core Engine in JavaScript for Faster Builds

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Tailwind CSS v4 introduces a major architectural overhaul, replacing its previous PostCSS-based system with a self-contained JavaScript engine. This rewrite eliminates PostCSS dependencies, simplifies the build chain, and gives the Tailwind team direct control over the entire CSS generation pipeline. The new engine applies smarter atomic CSS principles, enabling more efficient style deduplication and reduced compilation overhead. Configuration is now more unified, with a revamped plugin API that lets plugins tap directly into Tailwind's internal state rather than acting as external transformers. Together, these changes aim to deliver faster build times and a more streamlined developer experience for projects of all sizes.

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