---
name: "css-hardware-accelerated-keyframes"
description: "Craft zero-JS, 60fps CSS keyframe animations optimized for GPU compositing."
metadata:
  author: "W3C CSS Working Group"
  version: "1.0.0"
  runtime_compatibility:
    - "codex"
    - "claude-code"
    - "cursor"
    - "windsurf"
triggers:
  - "write css keyframe animation"
  - "optimize css animation 60fps"
  - "support prefers-reduced-motion css"
permissions:
  fs_read: true
  fs_write: "workspace"
  shell_exec: false
  net_access: false
---

# CSS3 Hardware-Accelerated Keyframe Engine

Builds pure CSS3 keyframe animations: transform3d GPU promotion, will-change hints, cubic-bezier timing functions, staggered animation-delay sequences, and reduced-motion media queries.

## When to Invoke
Invoke this skill whenever you need to:
- write css keyframe animation
- optimize css animation 60fps
- support prefers-reduced-motion css

## Execution SOP & Rules
1. Restrict animated CSS properties to transform and opacity to prevent browser layout reflows.
2. Promote animated layers to GPU compositing planes using transform: translateZ(0) or will-change: transform.
3. Always wrap non-essential movement in @media (prefers-reduced-motion: no-preference).
4. Remove will-change declarations once animations finish to avoid holding GPU memory buffers.

## Verification Checklist
- Run local linting, syntax validation, and type-checks before reporting completion.
- Ensure all created or modified files adhere to workspace boundaries and avoid uncommitted secrets.
- Verify tests or build commands exit cleanly with return code 0.