Micro-Interactions

Motion should confirm action and orient the user — not decorate. A tap that doesn't respond feels broken; a page that teleports feels disorienting. This skill covers click/tap micro-feedback and view transitions in React apps with compositor-safe, accessible motion.

Pair with [[ui-craft]] for interaction quality and states, [[react-patterns]] for Client boundaries and perf, [[accessibility]] for reduced-motion and focus, [[browser-checks]] to verify in a real browser, and [[perf-budget]] if animations run on hot paths or large lists.

Run the micro-interactions checklist before merge.

When to Use

• Adding press/hover/active feedback to buttons, cards, chips, or icon controls
• Animating route changes, tabs, modals, drawers, or step wizards
• Shared-element or cross-fade transitions between two views (list → detail)
• Replacing jarring instant swaps with short, purposeful motion
• Reviewing PRs where motion was added ad hoc or blocks interaction

Skip as primary skill when there is no interactive UI (pure API, batch jobs). Not a substitute for [[ui-craft]] — motion sits on top of correct structure and states.

Process

Work in order. Spec motion before sprinkling CSS.

1. Define the motion intent

For each interactive surface, write one line:

• Trigger — click, tap, keyboard activate, route enter, modal open
• Purpose — confirm press, show progress, maintain context, guide attention
• Duration target — micro-feedback: 100–200ms; view transition: 200–350ms; never >500ms for UI chrome

If you cannot state the purpose, skip the animation.

2. Respect reduced motion first

Before any implementation:

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

Or gate motion in JS:

const reduceMotion = window.matchMedia('(prefers-reduced-motion: reduce)').matches;

Rules:

• Never rely on motion alone to convey state (pair with color, text, icon, or aria-live)
• Under reduced motion: instant swap or opacity-only cross-fade — no scale/bounce travel
• Document motion behavior in the component or handoff notes ([[design-handoff]])

3. Click and tap micro-feedback

Prefer CSS-first on the interactive element itself — no extra libraries for a button press.

Do:

• :active or data-pressed with transform: scale(0.97) and transition: transform 120ms ease-out
• :hover only on devices that support hover (@media (hover: hover))
• transition on transform and opacity only (compositor-friendly)
• Keep hit target ≥44×44px; motion must not shrink the clickable area below that

Don't:

• Animate width, height, top, left, margin, or box-shadow spread on every click (layout/paint cost)
• Block the click handler waiting for animation to finish
• Use long spring animations on primary actions (feels sluggish)

.button {
  transition: transform 120ms ease-out, opacity 120ms ease-out;
}
.button:active {
  transform: scale(0.97);
}
@media (hover: hover) {
  .button:hover {
    opacity: 0.9;
  }
}

For loading after click: disable + spinner or progress — see [[ui-craft]] submit feedback.

4. Choose a view-transition strategy

Pick one approach per navigation pattern; don't mix APIs on the same route without reason.

View Transitions API (browser-native):

function navigate(updateDOM) {
  if (!document.startViewTransition) {
    updateDOM();
    return;
  }
  document.startViewTransition(() => updateDOM());
}

In React, call startViewTransition around the state update that swaps DOM (route content, tab panel, modal body). Assign stable view-transition-name only to elements that should morph — one name per logical shared element.

Next.js App Router: enable view transitions in framework config when available; use <Link> with view transition support rather than hand-rolling per link. Fall back to instant navigation when API unsupported.

React `<ViewTransition>` (when available in your React version): wrap the conditional branch that changes on navigation; treat as experimental — verify bundle and behavior in target browsers.

Avoid by default: pulling in Framer Motion / Motion for every button — use only if the project already standardizes on it and bundle budget allows ([[perf-budget]]).

5. Implement with correct React boundaries

• Micro-interactions on `'use client'` leaves — not entire page shells ([[react-patterns]])
• Route transition wrapper: one client boundary at the layout or transition provider level, not per leaf
• Don't animate Server Component output directly — animate the client wrapper or use View Transitions

on the document swap after navigation

• List animations: prefer one transitioning item (enter/exit), not animating 100 rows on mount

6. Timing, easing, and concurrency

• One motion at a time on primary CTA — don't stack scale + ripple + color + shadow
• `pointer-events: none` on exiting overlay during transition only if clicks are truly blocked
• Cancel in-flight transitions when user navigates again — don't queue animations

7. Verify in browser

Before merge ([[browser-checks]]):

• Click/tap primary actions — feedback visible within one frame of release
• Tab + Enter — same feedback as click (not hover-only)
• Enable prefers-reduced-motion in OS — motion reduces or disappears; UI still usable
• Route/modal transition — no focus trap broken, no content flash before transition
• Throttle CPU 4× — transitions stay smooth or degrade to instant (no jank loop)
• Mobile: no :hover stuck states; touch feedback works

Common Rationalizations

• "Motion makes it feel premium." — Premium is fast and responsive; slow bounce feels cheap.
• "We'll add reduced-motion later." — Later ships inaccessible UI; gate from line one.
• "Framer Motion for everything." — Bundle and abstraction cost; CSS + View Transitions cover most cases.
• "Animate width so the layout grows nicely." — Use transform scale or reserve space; layout animation is expensive.
• "200ms delay before navigate feels smoother." — Delay blocks the user; animate during navigation, don't delay it.
• "Only designers care about press states." — Users notice dead clicks; it's core [[ui-craft]] feedback.

Red Flags

• Click handler awaits animation before side effect
• :hover styles on touch-only devices with no :active fallback
• prefers-reduced-motion not handled
• Animating layout properties on lists with many items
• View transition without fallback when API missing
• Focus lost after route transition ([[accessibility]])
• Motion is the only indicator of success/error
• 'use client' on whole page for one button scale effect
• Transition duration >500ms on standard UI chrome
• Identical view-transition-name on multiple elements in the same view

Verification

• [ ] Motion intent documented (trigger, purpose, duration) per surface
• [ ] prefers-reduced-motion respected — instant or minimal alternative
• [ ] Click/tap uses transform/opacity; handler not blocked by animation
• [ ] Hover styles gated with @media (hover: hover) where needed
• [ ] View transitions use one chosen strategy with API fallback
• [ ] Client boundaries minimal ([[react-patterns]])
• [ ] Keyboard activation gets same feedback as pointer
• [ ] Checked in browser — mobile, reduced motion, slow CPU ([[browser-checks]])
• [ ] No layout-thrashing properties animated on hot paths
• [ ] Deep a11y/custom widgets coordinated with [[accessibility]] when applicable