Transitions.dev provides eighteen portable CSS transitions for common web app interactions. Each transition uses namespaced t-* selectors, semantic CSS custom properties, documented HTML hooks, and prefers-reduced-motion guards, with decision rules for choosing the right motion pattern.
npx skills add https://github.com/Jakubantalik/transitions.dev --skill transitions-devwget https://github.com/Jakubantalik/transitions.dev/archive/refs/heads/main.zip -O transitions-dev.zip