Tailwind CSS v4.0 Beta 1

Source: Tailwind Labs Date: 2024-11-21 URL: https://tailwindcss.com/blog/tailwindcss-v4-beta

Summary

First public beta of the v4 engine rewrite, released November 2024. Full builds up to 5x faster, incremental builds over 100x faster (microseconds). Unified toolchain — built-in import handling, vendor prefixing, syntax transforms — replacing the PostCSS plugin stack. CSS-first configuration replaces tailwind.config.js. Container queries, @starting-style, and popover support included by default.

Implications

• The beta marks the point where v4 became testable for real projects; the ~10-week path to stable (January 2025) was short, suggesting the engine was largely production-ready at beta time.
• Unified toolchain claim (no more postcss-import, no more autoprefixer) is the biggest DX shift for teams running complex PostCSS pipelines — worth validating against any custom PostCSS plugins before upgrading.
• The 100x+ incremental build claim aligns with the oxide/Rust benchmark framing from Tailwind Connect 2023 — this beta was the first public verification of those numbers.
• Container queries in core (no plugin) removes a frequently cited reason for using UnoCSS or other alternatives that included them natively earlier.