Build a short animated piece that runs in the browser without external runtime.
Default form
- Single HTML file with inline CSS keyframes / WAAPI / requestAnimationFrame
- 1080×1080 or 16:9 stage, target ≤30s, ≤60fps
- All assets inlined or fetched from public artifact URLs (no relative paths)
Structure
- Stage container with fixed aspect ratio
- Layered scenes (intro / hold / outro)
- Easing curves chosen for purpose, not novelty (overuse of bounce = AI slop)
Verification
- Loops cleanly if requested as loop
- Plays in Chrome + Safari without console errors
- Pauses on
prefers-reduced-motion: reduce