# Frontend Expert > Specialized instructions for modern frontend development (React, Next.js, CSS). Use when this capability is needed. - Skill: `tomevault-io/frontend-expert-4` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/frontend-expert-4` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/frontend-expert-4/raw - Safety review: pending - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Web & Frontend - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/frontend-expert-4 --- # Frontend Expert Skill Guidance for building premium, high-performance web interfaces. ## Core Best Practices - Use semantic HTML and accessible ARIA attributes. - Prioritize responsive design and mobile-first approach. - Use Vanilla CSS or TailwindCSS as per project guidelines. - Focus on micro-animations and smooth transitions. ## Testing - Use Playwright or Cypress for E2E tests. - Use React Testing Library for component testing. --- > Converted and distributed by [TomeVault](https://tomevault.io/claim/itublockchain) — claim your Tome and manage your conversions.