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animationsEmil Kowalski

Asymmetric Enter and Exit

SHOULD

SHOULD: Use asymmetric timing: deliberate user actions animate slower, system responses and exits snap. Symmetric enter/exit timing makes dismissals feel sluggish.

Deliberate actions animate slower; system responses and exits snap

Bad

Good

Why it matters

Symmetric timing makes dismissals feel sluggish. Let user-initiated, deliberate motion take its time, and let the system snap back quickly so the interface always feels responsive.

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.