Individual skill
animation-performance
Use when reviewing stylesheets, component styles, and responsive behavior related to Use transform and opacity for animations. Check the rendered layout across breakpoints and interaction states before proposing a fix.
skills/animation-performance/SKILL.md
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# Use transform and opacity for animations
Animating layout properties (width, height, top, margin) triggers the full browser rendering pipeline on every frame — style recalculation, layout, paint, and composite. This runs on the main thread and competes with JavaScript. Animating transform and opacity skips layout and paint entirely and runs on a dedicated GPU thread, achieving smooth 60fps even when the main thread is busy.
## Quick Reference
- Only transform and opacity can be composited on the GPU without triggering layout
- Use will-change: transform sparingly to promote an element to its own compositor layer
- Prefer CSS transitions and animations over JavaScript animation libraries for simple effects
- Respect prefers-reduced-motion to disable animations for users who need it
## Check
Find CSS animations or transitions in this file that animate layout-triggering properties like top, left, width, height, or margin. Flag them for optimization.