ui-animation

Original：🇺🇸 English

Translated

Guidelines and examples for UI motion and animation. Use when designing, implementing, or reviewing motion, easing, timing, reduced-motion behaviour, CSS transitions, keyframes, framer-motion, or spring animations.

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Sourcemblode/agent-skills

Added on2026-02-07

NPX Install

npx skill4agent add mblode/agent-skills ui-animation

SKILL.md Content

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UI Animation

Core rules

Animate to clarify cause/effect or add deliberate delight.
Keep interactions fast (200-300ms; up to 1s only for illustrative motion).
Never animate keyboard interactions (arrow-key navigation, shortcut responses, tab/focus).
Prefer CSS; use WAAPI or JS only when needed.
Make animations interruptible and input-driven.
Honor
```
prefers-reduced-motion
```
(reduce or disable).

What to animate

For movement and spatial change, animate only
```
transform
```
and
```
opacity
```
.
For simple state feedback,
```
color
```
,
```
background-color
```
, and
```
opacity
```
transitions are acceptable.
Never animate layout properties; never use
```
transition: all
```
.
Avoid
```
filter
```
animation for core interactions; if unavoidable, keep blur <= 20px.

SVG: apply transforms on a

<g>

wrapper with

transform-box: fill-box; transform-origin: center

.

Disable transitions during theme switches.

Spatial and sequencing

Set
```
transform-origin
```
at the trigger point.
For dialogs/menus, start around
```
scale(0.85-0.9)
```
; avoid
```
scale(0)
```
.
Stagger reveals <= 50ms.

Easing defaults

Enter and transform-based hover:
```
cubic-bezier(0.22, 1, 0.36, 1)
```
.
Move:
```
cubic-bezier(0.25, 1, 0.5, 1)
```
.
Simple hover colour/background/opacity:
```
200ms ease
```
.
Avoid
```
ease-in
```
for UI (feels slow).

Accessibility

If
```
transform
```
is used, disable it in
```
prefers-reduced-motion
```
.
Disable hover transitions on touch devices via
```
@media (hover: hover) and (pointer: fine)
```
.

Performance

Pause looping animations off-screen.
Toggle
```
will-change
```
only during heavy motion and only for
```
transform
```
/
```
opacity
```
.
Prefer
```
transform
```
over positional props in animation libraries.
Do not animate drag gestures using CSS variables.

Reference

Snippets and practical tips: examples.md

Workflow

Start with the core rules, then pick a reference snippet from examples.md.
Keep motion functional; honor
```
prefers-reduced-motion
```
.
When reviewing, cite file paths and line numbers and propose concrete fixes.