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PostCSS

Verified Sep 2026

A tool for transforming CSS with JavaScript

The plugin engine behind Tailwind, Autoprefixer and modern CSS tooling.

Andrey Sitnik's CSS transformer engine: plugins (Autoprefixer!) that rewrite CSS programmatically. The quiet substrate of Tailwind and half the CSS ecosystem.

Who it's for

Developers who want to transform CSS with JavaScript plugins: the engine behind Tailwind and autoprefixing.

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