Not the day-to-day CSS-first configuration reference (tailwindcss-core owns @theme/@utility/@variant usage) and not a utility-class lookup (the category skills own that).

Tailwind CSS v4.3 Core

Current stable: tailwindcss 4.3.3 (July 2026). Minor releases since v4.0: v4.1 (text shadows, masks), v4.2 (mauve/olive/mist/taupe palettes, @tailwindcss/webpack, logical pbs/mbs/inline-*/block-*/inset-s|e|bs|be utilities, font-features-*; start-*/end-* deprecated), v4.3 (scrollbar utilities, @container-size, zoom-*, tab-*, stacked/compound @variant, --default() in functional @utility).

Documentation

• CSS theme variables, design tokens, customization -> tailwindcss-core
• Directives (@utility, @variant, @theme, @apply) -> tailwindcss-core
• Custom utilities and variants -> tailwindcss-custom-styles
• Content detection (@source scanning) -> tailwindcss-core
• Migration from v3 to v4 -> see "v3 → v4 Breaking Changes" section below

Quick Reference - @theme Namespaces