Deft
Ask AI

Search

Search skills, authors and topics

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

Banner stacking

When to use

Sonner-style banner / toast stacking. Each new banner rises in with the toast motion (rise + cross-blur + slight scale) while older banners push back — smaller, higher, dimmer — instead of leaving; the fourth arrival sends the oldest out. Hovering the stack fans it into a readable list.

Use over a single toast when notifications can overlap: the stack keeps the newest legible while acknowledging the queue behind it.

HTML usage

html
<div class="t-stack">  <div class="t-stack-banner" data-depth="0">…</div></div>

Sonner-style. Append a new banner with .is-enter + data-depth 0, step every older banner's data-depth one back, force one reflow, then remove .is-enter in the same task (a rAF hop is skipped when the frame clock is throttled). A fourth banner gets .is-leaving; remove it after --stack-close. Hover spread is geometry in JS: pointer inside the collapsed stack box adds .is-spread, and it holds until the pointer leaves the taller spread column ((stack height + gap) * 2 above).

Tunable variables

VariableDefaultNotes
--stack-open350mssourced from --p34-open-dur
--stack-close250mssourced from --p34-close-dur
--stack-rise60pxsourced from --p34-distance
--stack-blur2pxsourced from --p34-blur
--stack-scale0.97sourced from --p34-scale-in
--stack-peek12pxsourced from --p34-peek
--stack-spread-gap8pxsourced from --p34-spread-gap
--stack-depth-scale0.06sourced from --p34-depth-scale
--stack-depth-fade0.4sourced from --p34-depth-fade
--stack-depth1-blur1pxsourced from --p34-depth1-blur
--stack-depth2-blur2pxsourced from --p34-depth2-blur
--stack-easecubic-bezier(0.22, 1, 0.36, 1)sourced from --p34-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 {  --stack-open: 350ms;  --stack-close: 250ms;  --stack-rise: 60px;  --stack-blur: 2px;  --stack-scale: 0.97;  --stack-peek: 12px;  --stack-spread-gap: 8px;  --stack-depth-scale: 0.06;  --stack-depth-fade: 0.4;  --stack-depth1-blur: 1px;  --stack-depth2-blur: 2px;  --stack-ease: cubic-bezier(0.22, 1, 0.36, 1);}

CSS

css
.t-stack { position: relative; }.t-stack-banner {  position: absolute;  left: 0;  bottom: 0;  /* Centre origin so an arriving banner scales like a toast; the     push-back depths switch to the bottom edge, which they can do     freely because the swap happens at identity. */  transform-origin: 50% 50%;  /* Explicit blur(0) rather than an unset filter — blur → none is     not reliably interpolated, and the cross-blur would snap. */  filter: blur(0);  will-change: transform, opacity, filter;  transition:    transform var(--stack-open) var(--stack-ease),    opacity var(--stack-open) var(--stack-ease),    filter var(--stack-open) var(--stack-ease);}.t-stack-banner[data-depth="0"] {  z-index: 3;  transform: translateY(0) scale(1);  opacity: 1;}.t-stack-banner[data-depth="1"] {  z-index: 2;  transform-origin: 50% 100%;  transform: translateY(calc(var(--stack-peek) * -1))             scale(calc(1 - var(--stack-depth-scale)));  opacity: calc(1 - var(--stack-depth-fade));  filter: blur(var(--stack-depth1-blur));}.t-stack-banner[data-depth="2"] {  z-index: 1;  transform-origin: 50% 100%;  transform: translateY(calc(var(--stack-peek) * -2))             scale(calc(1 - var(--stack-depth-scale) * 2));  opacity: calc(1 - var(--stack-depth-fade) * 1.6);  filter: blur(var(--stack-depth2-blur));}/* Spread: newest stays put, older ones climb one banner height   each (100% = the banner's own height). Driven by a class, not   :hover — the gaps between spread banners belong to no element. */.t-stack.is-spread .t-stack-banner[data-depth="1"],.t-stack.is-spread .t-stack-banner[data-depth="2"] { opacity: 1; filter: blur(0); }.t-stack.is-spread .t-stack-banner[data-depth="1"] {  transform: translateY(calc((100% + var(--stack-spread-gap)) * -1)) scale(1);}.t-stack.is-spread .t-stack-banner[data-depth="2"] {  transform: translateY(calc((100% + var(--stack-spread-gap)) * -2)) scale(1);}.t-stack-banner.is-enter {  transition: none;  transform: translateY(var(--stack-rise)) scale(var(--stack-scale));  opacity: 0;  filter: blur(var(--stack-blur));}.t-stack-banner.is-leaving {  z-index: 0;  transform-origin: 50% 100%;  transform: translateY(calc(var(--stack-peek) * -3))             scale(calc(1 - var(--stack-depth-scale) * 3));  opacity: 0;  filter: blur(var(--stack-blur));  transition:    transform var(--stack-close) var(--stack-ease),    opacity var(--stack-close) var(--stack-ease),    filter var(--stack-close) var(--stack-ease);}
@media (prefers-reduced-motion: reduce) {  .t-stack-banner { transition: none !important; transform: none !important; filter: 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
// Stack management: a new banner arrives at depth 0, everything// already stacked steps one depth back (pure data-depth swap — CSS// transitions the rest), and a fourth banner pushes the oldest out.const stack = document.querySelector(".t-stack");let banners = []; // newest first
const ms = (name, fb) => {  const v = parseFloat(    getComputedStyle(document.documentElement).getPropertyValue(name)  );  return Number.isFinite(v) ? v : fb;};
function addBanner(contentHTML) {  const el = document.createElement("div");  el.className = "t-stack-banner is-enter";  el.setAttribute("data-depth", "0");  el.innerHTML = contentHTML;  banners.unshift(el);  stack.appendChild(el);  banners.forEach((b, i) => {    if (i === 0) return;    if (i > 2) {      if (!b.classList.contains("is-leaving")) {        b.classList.add("is-leaving");        setTimeout(() => b.remove(), ms("--stack-close", 250) + 60);      }    } else {      b.setAttribute("data-depth", String(i));    }  });  banners = banners.slice(0, 3)    .concat(banners.slice(3).filter((b) => !b.classList.contains("is-leaving")));  // Flush the pre-open rest state, then release it in the same task.  // A rAF hop would be skipped whenever the frame clock is throttled,  // and the banner would land with no motion at all.  void el.offsetWidth;  el.classList.remove("is-enter");}
// Hover spread is geometry, not :hover — the gaps between spread// banners belong to no element, and boundary events would also fire// when a banner animates in under a still pointer.const stage = stack.parentElement;const spreadHeight = () =>  (stack.offsetHeight + ms("--stack-spread-gap", 8)) * 2;const within = (e, above) => {  const r = stack.getBoundingClientRect();  return e.clientX >= r.left && e.clientX <= r.right &&    e.clientY <= r.bottom && e.clientY >= r.top - above;};stage.addEventListener("pointermove", (e) => {  if (stack.classList.contains("is-spread")) {    if (!within(e, spreadHeight())) stack.classList.remove("is-spread");  } else if (within(e, 0)) {    stack.classList.add("is-spread");  }});stage.addEventListener("pointerleave", () => stack.classList.remove("is-spread"));