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animationsVercel

Implementation Preference

SHOULD

SHOULD: Prefer CSS > Web Animations API > JS libraries

Prefer CSS over Web Animations API over JavaScript libraries

Bad

Good

Why it matters

CSS animations run off the main thread and are most performant. Web Animations API provides more control when needed. JavaScript animation libraries should be a last resort as they run on the main thread and can block user interactions.

References

Built by Gleb Stroganov, design engineer at Evil Martians.

The rules come from other people's skills and guidelines — Vercel, Rauno Freiberg, @Ibelick, impeccable, Emil Kowalski, Tailwind, RAMS — each one credited on the Sources page. The work here is extraction and wiring: every rule is pulled into one corpus, given a good and a bad example you can operate, a MUST/SHOULD/NEVER rule an agent can paste, and a link back to where it came from.