SkillsAdd

thedaviddias/front-end-checklist

unused-css

Use when reviewing stylesheets, component styles, and responsive behavior related to Remove unused CSS rules. Check the rendered layout across breakpoints and interaction states before proposing a fix.

First seen Jun 5, 2026

Installation

$ npx skills add thedaviddias/front-end-checklist --skill unused-css
View on skills.sh ↗ GitHub repository ↗

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Also in this package

Other skills from thedaviddias/front-end-checklist · top by installs.

npx skills add thedaviddias/front-end-checklist
frontend-checklist-global 96 color-contrast 22 animation-performance 22 https 19 pdf-size 18 word-count 18 image-optimization 18 cumulative-layout-shift 18 mobile-testing 18 quality 17

Browse all from thedaviddias/front-end-checklist

More details

Agent compatibility

Declared targets from SKILL.md / docs. Unmarked agents are not listed — the skill may still install via the CLI.

Claude Code Not declared
Cursor Not declared
Codex Not declared
GitHub Copilot Not declared
Windsurf Not declared
Gemini CLI Not declared
Cline Not declared
OpenCode Not declared

Repository health

Stars 74.1K
License MIT
Default branch main
Open issues 5
Status Active

Skill metadata

Parsed from SKILL.md frontmatter.

More metadata
category
css
priority
high
difficulty
intermediate
estimatedTime
25
source
frontendchecklist.io
url
https://frontendchecklist.io/en/rules/css/unused-css

Package contents

Files included with this skill beyond the listing page.

  • skill md SKILL.md 1,665 B
  • docs SUMMARY.md 219 B

History

  1. First seen on skills.sh
  2. First recorded snapshot · 6 installs

SKILL.md

Remove unused CSS rules

Most projects use only 10-25% of their CSS—removing the rest can cut bundle sizes by 75%+ and dramatically improve load times.

Quick Reference

  • Use PurgeCSS or UnCSS to remove unused selectors
  • Integrate into build pipeline (Webpack, Vite, PostCSS)
  • Safelist dynamic classes and framework-specific patterns
  • Typical reduction: 50-90% for CSS framework users

Check

Use tools like PurgeCSS, UnCSS, or Chrome DevTools Coverage to identify and remove unused CSS to reduce bundle size and improve performance.

Fix

Implement automated unused CSS removal in your build process and regularly audit CSS files to eliminate dead code and unused selectors.

Explain

Explain how unused CSS bloats bundle sizes, slows page loading, and how modern tools can safely remove unused styles without breaking functionality.

Code Review

Review stylesheets, component styles, and responsive states related to Remove unused CSS rules. Flag exact selectors, declarations, or breakpoints that violate the rule in the rendered UI.

For full implementation details, code examples, and framework-specific guidance, see references/rule.md.

Rule page: https://frontendchecklist.io/en/rules/css/unused-css