Tailwind Labs Tailwind CSS v4 Best Practices

Comprehensive performance optimization guide for Tailwind CSS v4 applications, maintained by Tailwind Labs. Contains 42 rules across 8 categories, prioritized by impact to guide automated refactoring and code generation.

When to Apply

Reference these guidelines when:

• Configuring Tailwind CSS v4 build tooling (Vite plugin, PostCSS, CLI)
• Writing or migrating styles using v4's CSS-first approach
• Optimizing CSS bundle size and build performance
• Implementing responsive designs with breakpoints or container queries
• Setting up theming with @theme directive and design tokens

Rule Categories by Priority

build-

gen-

bundle-

util-

comp-

theme-

resp-

anim-

Quick Reference

1. Build Configuration (CRITICAL)

• build-vite-plugin

  - Use Vite Plugin Over PostCSS

• build-css-import

  - Use CSS Import Over @tailwind Directives

• build-content-detection

  - Leverage Automatic Content Detection

• build-node-version

  - Use Node.js 20+ for Optimal Performance

• build-postcss-simplify

  - Remove Redundant PostCSS Plugins

• build-cli-package

  - Use Correct CLI Package

2. CSS Generation (CRITICAL)

• gen-css-first-config

  - Use CSS-First Configuration Over JavaScript

• gen-avoid-theme-bloat

  - Avoid Excessive Theme Variables

• gen-oklch-colors

  - Use OKLCH Color Space for Vivid Colors

• gen-utility-directive

  - Use @utility for Custom Utilities

• gen-dynamic-utilities

  - Use Dynamic Utility Values

• gen-css-variable-syntax

  - Use Parentheses for CSS Variable References

3. Bundle Optimization (HIGH)

• bundle-remove-unused-plugins

  - Remove Built-in Plugins

• bundle-avoid-preprocessors

  - Avoid Sass/Less Preprocessors

• bundle-css-minification

  - Enable CSS Minification in Production

• bundle-avoid-cdn-production

  - Avoid Play CDN in Production

• bundle-split-critical-css

  - Extract Critical CSS for Initial Render

4. Utility Patterns (HIGH)

• util-renamed-utilities

  - Use Renamed Utility Classes

• util-important-modifier

  - Use Trailing Important Modifier

• util-variant-stacking

  - Use Left-to-Right Variant Stacking

• util-explicit-colors

  - Use Explicit Border and Ring Colors

• util-opacity-modifier

  - Use Slash Opacity Modifier

• util-gradient-via-none

  - Use via-none to Reset Gradient Stops

5. Component Architecture (MEDIUM-HIGH)

• comp-avoid-apply-overuse

  - Avoid Overusing @apply

• comp-reference-directive

  - Use @reference for CSS Module Integration

• comp-utility-file-scope

  - Understand Utility File Scope

• comp-smart-sorting

  - Leverage Smart Utility Sorting

• comp-container-customize

  - Customize Container with @utility

6. Theming & Design Tokens (MEDIUM)

• theme-semantic-tokens

  - Use Semantic Design Token Names

• theme-dark-mode-class

  - Use Class-Based Dark Mode for Control

• theme-prefix-variables

  - Use Prefix for Variable Namespacing

• theme-runtime-variables

  - Leverage Runtime CSS Variables

• theme-color-scheme

  - Set color-scheme for Native Dark Mode

7. Responsive & Adaptive (MEDIUM)

• resp-mobile-first

  - Use Mobile-First Responsive Design

• resp-container-queries

  - Use Container Queries for Component-Level Responsiveness

• resp-custom-breakpoints

  - Define Custom Breakpoints in @theme

• resp-hover-capability

  - Understand Hover Behavior on Touch Devices

• resp-logical-properties

  - Use Logical Properties for RTL Support

8. Animation & Transitions (LOW-MEDIUM)

• anim-gpu-accelerated

  - Use GPU-Accelerated Transform Properties

• anim-starting-style

  - Use @starting-style for Entry Animations

• anim-gradient-interpolation

  - Use OKLCH Gradient Interpolation

• anim-3d-transforms

  - Use Built-in 3D Transform Utilities

How to Use

Read individual reference files for detailed explanations and code examples:

• Section definitions - Category structure and impact levels
• Rule template - Template for adding new rules

Full Compiled Document

For a complete guide with all rules expanded, see AGENTS.md.

Reference Files