Overview
The demo has a Load preview button whose label turns into a small spinner, and a larger standalone spinner below it. Each spinner carries a text label, and with reduced motion it shows a still mark with text. Motion: enter: 220 ms, cubic-bezier(0.2,0.8,0.2,1); exit: 160 ms, cubic-bezier(0.4,0,1,1). The shared easing curves live in one theme file, and each duration sits right next to its transition. With reduced motion turned on, the component changes state without movement and stays fully usable. Built with React 19 and TypeScript and Tailwind CSS 4, animated with plain CSS transitions (no animation library), with keyboard and screen reader behavior written into the component. Light and dark themes come from CSS variables you can edit. Included: the component source, light and dark theme variables, a runnable demo page, and setup guides for people and for AI coding agents.
Highlights
- Production-ready, documented source
- Clean, componentized architecture
- Drops into your stack with minimal setup

