css-animation-patterns

CSS animations and transitions provide hardware-accelerated motion for web interfaces using keyframes, transitions, transforms, and modern scroll-driven and view transition APIs. Animate only composite properties (transform, opacity, filter) for smooth 60fps performance, and always respect prefers-reduced-motion.

The browser rendering pipeline has four stages: Style, Layout, Paint, and Composite. Animating composite-only properties skips Layout and Paint entirely, running on the GPU compositor thread. This is the single most important performance principle for CSS animation.

Modern CSS adds two powerful APIs: scroll-driven animations link keyframe progress to scroll position or element visibility instead of time, and the View Transitions API creates snapshot-based animated transitions between DOM states for both SPAs and MPAs.

CSS 动画、过渡、关键帧和现代运动 API。添加动画、过渡、滚动驱动效果或视图过渡时使用。用于 css 动画、过渡、关键帧、视图过渡、滚动动画、变换、运动偏好、动画时间轴。 来源：oakoss/agent-skills。