Community Tailwind CSS v4 Best Practices

Comprehensive performance optimization guide for Tailwind CSS v4 applications. Contains 44 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

Priority

Category

Impact

Prefix

1

Build Configuration

CRITICAL

build-

2

CSS Generation

CRITICAL

gen-

3

Bundle Optimization

HIGH

bundle-

4

Utility Patterns

HIGH

util-

5

Component Architecture

MEDIUM-HIGH

comp-

6

Theming & Design Tokens

MEDIUM

theme-

7

Responsive & Adaptive

MEDIUM

resp-

8

Animation & Transitions

LOW-MEDIUM

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

• comp-custom-variant - Use @custom-variant for Custom Variant Definitions

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

• theme-inline-static - Use @theme inline and @theme static for Variable Control

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 - Pair Hover with Active for Touch-Friendly Interactions

• 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

File

Description

AGENTS.md

Complete compiled guide with all rules

references/_sections.md

Category definitions and ordering

assets/templates/_template.md

Template for new rules

metadata.json

Version and reference information