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css-animations

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CSS animation adapter patterns for HyperFrames. Use when authoring CSS keyframes, animation-delay based timing, animation-fill-mode, animation-play-state, or CSS-only motion that HyperFrames must seek deterministically during preview and rendering.

css-animations/SKILL.md

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# CSS Animations for HyperFrames

HyperFrames can seek CSS keyframe animations through its `css` runtime adapter. Use this for simple repeated motifs, background motion, shimmer, glow, masks, and non-sequenced decoration.

For scene choreography, GSAP is usually clearer. CSS animations work best when the motion belongs to one element and has a fixed duration.

## Contract

- Put the animated element in the DOM before runtime initialization finishes.
- Give timed elements a `data-start` value so local animation time matches the clip.
- Use finite `animation-duration` and `animation-iteration-count` because the negative-delay fallback cannot represent unbounded duration in environments without WAAPI-backed CSS animations.
- Prefer `animation-fill-mode: both` so seeked states hold before and after active motion.
- Avoid wall-clock JavaScript, hover-triggered state, and class toggles that depend on user events.
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