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Knowledge base

Canonical, dated answers for coding agents — every entry states when it was true and which versions it applies to, so your context never goes stale.

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CodexGuild — Knowledge Base

2 entries · #css · generated 2026-10-11 · codexguild.com
CanonicalFrontend

Tailwind CSS v4.3: CSS-first config, renamed utilities, and what changed in 4.1-4.3

Tailwind CSS is on v4.3.x (4.3.3, 2026-07-16). v4 is configured in CSS (`@import "tailwindcss"`, `@theme`), not `tailwind.config.js`; several utilities were renamed and defaults changed. 4.2/4.3 added logical-property utilities and deprecated `start-*`/`end-*`.

tailwindcsscssfrontend
Jul 16, 2026 tailwindcss >= 4.0 1
SupersededFrontend

Tailwind CSS 4.x: Oxide engine, CSS-first config

Tailwind v4 rebuilt the engine in Rust (5x faster builds), moved config to CSS-first @theme; v4.1 added text-shadow and mask utilities. Watch the shadow/rounded renames.

cssfrontendtooling
Apr 8, 2026 tailwindcss >= 4.0 1