Animate

--- name: animate description: "Implement purposeful interface animations: easing, springs, interruption, exits, and reduced motion. Use on existing components or an accepted UI brief; this is not a video template." en_name: "animate" zh_name: "界面动效实现 · Emil" zh_description: "为界面组件实现动画、缓动、弹簧与进出场，处理打断和减少动态效果偏好；适用于原型微交互，不是视频模板。" triggers: - "animate" - "animation" - "motion" - "动效" - "动画" - "微交互" - "界面动效" - "emil kowalski" license: MIT od: mode: utility category: animation-motion upstream: "https://github.com/emilkowalski/skills" source-commit: e8a175de22ae1e49370fc144c1f3bb9aeedf988d --- # Building Animations ## Open Design execution context Use this as a functional helper on the user's current interface or accepted brief. Keep the host's task route, current stage, tool availability, and output contract. Planning describes the motion; implementation happens only in the host's authoring stage. Do not add an extra review, recording, rendering, or approval phase when the host disallows it. Reuse the project's existing stack and motion tokens. Companion skills are optional: use them only if installed; otherwise apply the relevant guidance here without inventing a tool invocation. Report measurements only when actually observed; mark visual estimates and checks that could not be performed explicitly. This helper implements interface motion; `review-animations` reviews existing motion and `emilkowalski-motion` supplies a compact follow-up polish workflow. Use the current request immediately; do not stop at a greeting. ## Operating Posture You are a senior design engineer building the animation yourself. The bar is Emil Kowalski's animation philosophy — the same bar `review-animations` enforces. Write it so it passes that review the first time. Two failure modes, and the first is worse: 1. **Animating something that shouldn't animate.** The gate below exists to produce zero lines of code sometimes. That's a success, not a dodge. 2. **Animating the right thing with the wrong ingredients** — `ease-in` on an entrance, `scale(0)`, keyframes on a toast, a duration that makes a dropdown feel sluggish. Never present motion options as a menu. Make the call, state the reasoning in one line, write the code. ## Hard Rules 1. **Run the sequence in order.** Steps 1 and 2 gate everything. Don't reach for a curve before you know whether it animates at all. 2. **No approximated values.** Every curve, duration, and spring config comes from the tables below. Never invent `cubic-bezier(0.4, 0, 0.2, 1)` because it looks familiar. 3. **Extend the codebase's tokens, don't fork them.** If `--ease-out` or a duration scale already exists, use it. Adding a parallel system is a defect. 4. **Reduced motion and hover gating ship with the animation**, not as a follow-up. 5. **Cheapest tool that works.** Don't install a motion library for a fade. ## The Build Sequence ### 1. Should this animate at all? | Frequency | Decision | | --- | --- | | 100+ times/day (keyboard shortcuts, command palette toggle) | **No animation. Ever.** Stop here. | | Tens of times/day (hover effects, list navigation) | Near-imperceptible only — fast and subtle, or nothing | | Occasional (modals, drawers, toasts) | Standard animation | | Rare / first-time (onboarding, success, celebration) | The delight budget lives here | **Keyboard-initiated actions are a disqualifier, not a judgment call.** Raycast has no open/close animation — that is correct for something opened hundreds of times a day. If the request fails this gate, say so plainly and don't write the animation. Offer the non-motion alternative (instant state change, a static affordance) instead. ### 2. What is the purpose? Name it in one of these words before continuing: - **Feedback** — confirming the interface heard the user - **Spatial consistency** — showing where something came from or went - **State indication** — making a state change legible - **Preventing a jarring change** — bridging content that would otherwise teleport - **Explanation** — demonstrating how something works (marketing/onboarding only) - **Delight** — allowed *only* at the rare/first-time tier Can't name it? Don't build it. "It looks cool" on a frequently-seen element is a reason to stop. Also check **function**: data the user is reading or acting on should not move for style. A decorative mouse-tracking effect belongs on a marketing page, not on a graph in a banking app. ### 3. Pick the tool — cheapest that works Walk down; stop at the first that fits. | Need | Tool | | --- | --- | | Hover, press, color, a state toggle you control with a class or attribute | **CSS transition** | | Entry animation on mount, no JS state | **CSS `@starting-style`** | | Predetermined motion that must stay smooth while the page is busy loading | **CSS animation** (runs off the main thread) | | Programmatic control with CSS performance, no library | **WAAPI** (`element.animate()`) | | Springs, layout animations, exit animations, gesture-driven values | **Motion** (`motion.dev`) | CSS animations beat JS under load — they run off the main thread, while `requestAnimationFrame`-based animation drops frames while the browser loads, scripts, or paints. Use CSS for predetermined motion, JS for dynamic and interruptible motion. If the task needs a *component* rather than an animation, use the project's existing accessible component library. If `pick-ui-library` is installed and the user needs library selection, consult it; its absence must not block the task. Preserve keyboard and focus behavior when adding motion. ### 4. Pick the properties - **`transform` and `opacity` only.** They skip layout and paint and run on the GPU. `width`/`height`/`margin`/`padding`/`top`/`left` trigger all three. (`clip-path` is the sanctioned fourth — see references/RECIPES.md. `height` is tolerated only for accordions, where there's no transform equivalent.) - **Never `scale(0)`.** Start from `scale(0.9–0.97)` + `opacity: 0`. Nothing in the real world appears from nothing. - **`transform-origin` at the trigger** for popovers, dropdowns, menus, tooltips — `var(--transform-origin)` in Base UI. **Modals are exempt**; they're not anchored to a trigger, so they stay centered. - **Percentages in `translate()`** are relative to the element's own size — `translateY(100%)` moves by its own height whatever the content. Prefer over hardcoded pixels. - **In Motion, use the full transform string.** `x`/`y`/`scale` shorthands are not hardware-accelerated and drop frames under load: ```jsx // drops frames under load // hardware accelerated ``` - **Never drive a child's transform from a CSS variable on the parent** — it recalculates styles for every child. Set `transform` on the element directly. ### 5. Easing and duration — or a spring **Easing**, in decision order: | Situation | Easing | | --- | --- | | Entering or exiting | `ease-out` | | Moving / morphing on screen | `ease-in-out` | | Hover / color change | `ease` | | Constant motion (marquee, progress) | `linear` | | Default | `ease-out` | **Never `ease-in` on UI.** It starts slow, delaying the exact moment the user is watching. `ease-out` at 200ms *feels* faster than `ease-in` at 200ms. Built-in CSS easings are too weak. Use these: ```css --ease-out: cubic-bezier(0.23, 1, 0.32, 1); /* strong ease-out for UI */ --ease-in-out: cubic-bezier(0.77, 0, 0.175, 1); /* strong ease-in-out for on-screen movement */ --ease-drawer: cubic-bezier(0.32, 0.72, 0, 1); /* iOS-like drawer curve (Ionic) */ ``` Need a curve that isn't here? Take it from [easing.dev](https://easing.dev/) or [easings.co](https://easings.co/). Don't hand-roll one. **Duration:** | Element | Duration | | --- | --- | | Button press feedback | 100–160ms | | Tooltips, small popovers | 125–200ms | | Dropdowns, selects | 150–250ms | | Modals, drawers | 200–500ms | | Marketing / explanatory | Can be longer | **UI animations stay under 300ms.** A 180ms dropdown feels more responsive than a 400ms one. **Reach for a spring instead** when the motion is drag with momentum, an element that should feel alive, a gesture the user can interrupt or reverse, or decorative mouse-tracking: ```js { type: "spring", duration: 0.5, bounce: 0.2 } // Apple-style — easier to reason about { type: "spring", mass: 1, stiffness: 100, damping: 10 } // traditional physics — more control ``` Keep bounce at 0.1–0.3, and avoid bounce in most UI — reserve it for drag-to-dismiss and playful interactions. ### 6. Interruption and exit - **Transitions, not keyframes, for anything triggered rapidly** — toasts, toggles, anything a user can fire twice in a second. Transitions retarget from the current value; keyframes restart from zero. - **Springs for gestures**, because they carry velocity through an interruption. - **Exit the way it entered.** A toast that slides in from the bottom leaves through the bottom. Symmetric paths are what make swipe-to-dismiss feel obvious. - **Asymmetric timing where the user is deciding.** Slow on the deliberate phase (a hold-to-confirm press: 2s linear), snappy on the system response (release: 200ms ease-out). ### 7. Reduced motion and pointer gating Ships with the animation, every time. ```css @media (prefers-reduced-motion: reduce) { .element { animation: fade 0.2s ease; } /* keep opacity/color, drop transform-based motion */ } @media (hover: hover) and (pointer: fine) { .element:hover { transform: scale(1.05); } /* touch fires false hovers on tap */ } ``` ```jsx const reduce = useReducedMotion(); const closedX = reduce ? 0 : '-100%'; ``` Reduced motion means **fewer and gentler** animations, not zero — keep transitions that aid comprehension, remove movement and position changes. ## Recipes For ready-to-build implementations of the common cases — button press, dropdown, tooltip, modal, drawer, toast, accordion, stagger, hold-to-confirm, tab indicator, scroll reveal, drag-to-dismiss — see [references/RECIPES.md](references/RECIPES.md). Load it whenever the request matches one of those components; start from the recipe rather than from a blank file. ## Never Ship Self-check before you finish. Each of these is an automatic block in `review-animations`: | Never | Instead | | --- | --- | | `transition: all` | Name the exact properties | | `transform: scale(0)` entrance | `scale(0.95)` + `opacity: 0` | | `ease-in` on a UI element | `ease-out` or a strong custom curve | | Built-in `ease-out` on a deliberate animation | `cubic-bezier(0.23, 1, 0.32, 1)` | | Animation on a keyboard shortcut or 100+/day action | No animation | | UI duration over 300ms with no reason | 150–250ms | | `transform-origin: center` on a trigger-anchored popover | `var(--transform-origin)` (modals exempt) | | Keyframes on toasts, toggles, rapidly-triggered elements | CSS transitions | | Animating `width`/`height`/`margin`/`padding`/`top`/`left` | `transform` / `opacity` | | Motion `x`/`y`/`scale` props under load | Full `transform` string | | Ungated `:hover` motion | `@media (hover: hover) and (pointer: fine)` | | Missing `prefers-reduced-motion` | Gentler variant, not zero | | Everything entering at once | 30–80ms stagger | ## Output Write the code. Then, in at most a few lines: - **The gate result** — frequency tier and the named purpose. If something in the request was rejected, say which and why. - **The ingredients** — tool, properties, curve, duration or spring config, in one line each. - **What to feel-check** — if the result depends on feel you can't judge from code (a crossfade, a spring's bounce, the opacity/height balance in an entering list), say so and point at the check: play it at 2–5× duration or in the DevTools animation inspector, step it frame by frame, test gestures on a real device, and look again the next day with fresh eyes. Don't pad this into a report. The code is the deliverable. ## Tone Opinionated and brief. When the honest answer is "this shouldn't animate," give it — that answer is the reason this skill exists. When feel genuinely can't be settled from code, say so instead of guessing at a value.