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Jakubantalik / transitions.dev

transitions-dev

Production-ready CSS transitions for web apps. Use when implementing notification badges, dropdowns, modals, panel reveals, page transitions, card resizes, number pop-ins, text swaps, icon swaps, success checks, avatar group hovers, error state shakes, search/input clear, skeleton loaders, shimmer text, sliding tabs, tooltips, staggered text reveals, card hover tilt, plus-to-menu morph, accordions, toasts, like buttons, learn-more hovers, checkbox checks, spinning counters, toggles, AI thinking states, reasoning streams, streaming text, matrix dot loaders, or banner stacking. Triggers on "add a transition", "animate the dropdown", "make the modal open smoothly", "swap icon", "page slide", "stagger animation", "open / close transition", "make it animate", "fade between", "success animation", "form error", "shake on invalid", "hover lift", "avatar stack hover", "clear the search", "skeleton loader", "loading shimmer", "shimmer text", "sliding tabs", "segmented control", "tooltip", "reveal text", "tilt card", "3D hover tilt", "cursor glare", "plus to menu", "FAB morph", "accordion", "collapsible", "expand / collapse", "disclosure", "toast", "snackbar", "like button", "heart animation", "learn more arrow", "checkbox", "check animation", "spinning counter", "odometer", "slot machine digits", "toggle", "switch", "thinking states", "AI status line", "agent reasoning", "reasoning stream", "streaming text", "stream words in", "matrix loader", "dot loader", "banner stack", "stacked toasts". Also "motion tokens", "scan for ad-hoc transitions", "replace hardcoded durations with motion tokens", "tokenize my animations", and the commands transitions reveal, transitions review, transitions apply, transitions refine.

View sourceMotionInteraction

Install

npx skills add https://github.com/Jakubantalik/transitions.dev --skill transitions-dev

Modal open / close

When to use

Modal dialogs and full-overlay surfaces that scale up from center. Use when the surface is conceptually "on top of" the page rather than anchored to a trigger.

HTML usage

html
<div class="t-modal" role="dialog">…</div>

State:

  • Add .is-open to open (scales up from --modal-scale).
  • On close, swap .is-open for .is-closing, then remove .is-closing after --modal-close-dur.

Tunable variables

VariableDefaultNotes
--modal-open-dur250mssourced from --p7-open-dur
--modal-close-dur150mssourced from --p7-close-dur
--modal-scale0.96sourced from --p7-scale
--modal-scale-close0.96sourced from --p7-scale-close
--modal-easecubic-bezier(0.22, 1, 0.36, 1)sourced from --p7-ease

The :root defaults below match the live tuning on transitions.dev. Drop them into your global stylesheet once — every transition in this skill reads from semantic names like these, so multiple transitions can share a single :root block.

css
:root {  --modal-open-dur: 250ms;  --modal-close-dur: 150ms;  --modal-scale: 0.96;  --modal-scale-close: 0.96;  --modal-ease: cubic-bezier(0.22, 1, 0.36, 1);}

CSS

css
.t-modal {  transform-origin: center;  transform: scale(var(--modal-scale));  opacity: 0;  pointer-events: none;  transition:    transform var(--modal-open-dur) var(--modal-ease),    opacity   var(--modal-open-dur) var(--modal-ease);  will-change: transform, opacity;}.t-modal.is-open {  transform: scale(1);  opacity: 1;  pointer-events: auto;}.t-modal.is-closing {  transform: scale(var(--modal-scale-close));  opacity: 0;  pointer-events: none;  transition:    transform var(--modal-close-dur) var(--modal-ease),    opacity   var(--modal-close-dur) var(--modal-ease);}
@media (prefers-reduced-motion: reduce) {  .t-modal { transition: none !important; }}

The @media (prefers-reduced-motion: reduce) guard at the bottom of the snippet is required — keep it. It zeroes the transition for users who have asked for less motion at the OS level.

JavaScript orchestration

js
// Same close-then-cleanup pattern as the dropdown — modals scale from// --modal-scale up to 1, then on close dip to --modal-scale-close.const modal = document.querySelector(".t-modal");const closeMs = parseFloat(  getComputedStyle(document.documentElement).getPropertyValue("--modal-close-dur")) || 150;
function openModal() {  modal.classList.remove("is-closing");  modal.classList.add("is-open");}function closeModal() {  modal.classList.remove("is-open");  modal.classList.add("is-closing");  setTimeout(() => modal.classList.remove("is-closing"), closeMs);}