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waapi

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Web Animations API adapter patterns for HyperFrames. Use when authoring element.animate() motion, Animation currentTime seeking, document.getAnimations(), KeyframeEffect timing, fill modes, or native browser animations that must render deterministically in HyperFrames.

waapi/SKILL.md

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# Web Animations API for HyperFrames

HyperFrames can seek Web Animations API animations through its `waapi` runtime adapter. WAAPI is useful when you want native browser keyframes with JavaScript-created timing and no GSAP dependency.

## Contract

- Create animations synchronously during composition initialization.
- Use `element.animate(...)` with finite `duration` and `iterations`.
- Use `fill: "both"` so seeked states persist.
- Pause animations after creation or let the adapter pause them on first seek.
- Avoid callbacks and promises for render-critical state.

The adapter calls `document.getAnimations()`, sets each animation's `currentTime` to HyperFrames time in milliseconds, then pauses it.
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