Agent Skills: modern-web-guidance

Steer toward modern web platform APIs instead of legacy patterns. Use FIRST for any HTML/CSS/clientside JS task — modals, dialogs, popovers, anchor positioning, container queries, :has(), :user-valid, View Transitions, scroll-driven animations, INP/LCP optimization, autofill forms, custom scrollbars, scheduler.yield. The CLI runs local semantic search over expert-curated, Baseline-aware guides and returns token-efficient implementation patterns, gotchas, and fallbacks. Do NOT trigger for backend, SQL, CI/CD, Docker, or generic local scripts. Keywords: frontend, html, css, web, browser api, popover, dialog, view transition, baseline, web platform, modern css, accessibility, a11y, forms, autofill, performance, core web vitals.