build-web

Searches a curated database of standardized modern web-platform patterns before writing any browser code — so Claude uses the platform instead of heavy dependencies or ad-hoc solutions. Covers: - Layout: container queries, :has(), subgrid - Motion: View Transitions, scroll-driven animations - Performance: LCP, Core Web Vitals, INP - Platform APIs: anchor positioning, Popover API - Accessibility and forms Search first, then retrieve the full guide. Patterns default to Baseline Widely Available — safe across modern browsers.