frontend-codelisted

# Frontend Code Skill This skill specializes in browser-based development including HTML, CSS, React, Vue, Angular, etc. ## When to use this skill - When building responsive, accessible user interfaces. - When managing client-side state and routing. - When addressing Core Web Vitals (LCP, FID, CLS). ## Guidelines - Assume a mobile-first philosophy for responsive design. - Semantic HTML is critical for Accessibility (a11y) and SEO. Avoid using generic `div` elements when native elements apply. - Minimize main-thread blocking JavaScript to maintain 60 FPS interactions. - Scope CSS to components (CSS Modules, CSS-in-JS, Shadow DOM) to avoid global style leaking.