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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

Matrix dot loader

When to use

Tiny inline loaders built from a 4×4 matrix of 2px dots. All four variants share one colour-pulse keyframe; a per-dot delay table gives each its motion character — a column scan, a randomized-looking twinkle, a perimeter orbit, a centre-out pulse. Rounded variants drop the four corner dots.

Use where a spinner would be too loud: alongside a status line, inside a compact button, in a table cell. The loader whispers.

HTML usage

html
<div class="t-matrix" data-variant="scan"></div>

JS builds sixteen dots per loader and hands each a --d delay (ms) into the shared colour-pulse cycle — the variant is just a delay table. scan: col * cycle/10. twinkle: the order [7,2,11,5,14,9,0,12,3,15,6,10,13,1,8,4] * cycle/16. orbit: the ring [1,2,7,11,14,13,8,4] * cycle/8, centre holds steady. pulse: inner [5,6,9,10] first, the rest cycle*0.16 behind. Rounded variants mark the corners [0,3,12,15] .is-gap so they render nothing.

Tunable variables

VariableDefaultNotes
--matrix-cycle1200mssourced from --p33-cycle
--matrix-base#d9d9d9sourced from --p33-base
--matrix-active#85858fsourced from --p33-active
--matrix-easeease-in-outsourced from --p33-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 {  --matrix-cycle: 1200ms;  --matrix-base: #d9d9d9;  --matrix-active: #85858f;  --matrix-ease: ease-in-out;}

CSS

css
.t-matrix {  display: grid;  grid-template-columns: repeat(4, 2px);  grid-auto-rows: 2px;  gap: 2px;}.t-matrix i {  display: block;  background: var(--matrix-base);  animation: t-matrix-pulse var(--matrix-cycle) var(--matrix-ease) infinite;  animation-delay: calc(var(--d, 0) * 1ms);}/* Hole positions (rounded variants) render nothing. */.t-matrix i.is-gap { visibility: hidden; animation: none; }@keyframes t-matrix-pulse {  0%, 45%, 100% { background-color: var(--matrix-base); }  15%           { background-color: var(--matrix-active); }}
@media (prefers-reduced-motion: reduce) {  .t-matrix i { animation: 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
// Build 16 dots per loader and hand each a --d delay (ms) into the// shared pulse cycle — the variant is just a delay table.const CORNERS = [0, 3, 12, 15];// Clockwise perimeter (corner-less ring), then centre cells.const RING = [1, 2, 7, 11, 14, 13, 8, 4];const INNER = [5, 6, 9, 10];const TWINKLE = [7, 2, 11, 5, 14, 9, 0, 12, 3, 15, 6, 10, 13, 1, 8, 4];
const cycle = parseFloat(  getComputedStyle(document.documentElement).getPropertyValue("--matrix-cycle")) || 1200;
document.querySelectorAll(".t-matrix").forEach((loader) => {  const variant = loader.getAttribute("data-variant");  const rounded = loader.getAttribute("data-rounded") === "true";  for (let idx = 0; idx < 16; idx++) {    const dot = document.createElement("i");    const col = idx % 4;    if (rounded && CORNERS.includes(idx)) {      dot.className = "is-gap";    } else if (variant === "scan") {      dot.style.setProperty("--d", String(Math.round(col * (cycle / 10))));    } else if (variant === "twinkle") {      dot.style.setProperty("--d", String(Math.round(TWINKLE[idx] * (cycle / 16))));    } else if (variant === "orbit") {      const k = RING.indexOf(idx);      if (k !== -1) {        dot.style.setProperty("--d", String(Math.round(k * (cycle / 8))));      } else {        dot.style.animation = "none"; // centre holds steady under the ring      }    } else if (variant === "pulse") {      const ring = INNER.includes(idx) ? 0 : 1;      dot.style.setProperty("--d", String(Math.round(ring * (cycle * 0.16))));    }    loader.appendChild(dot);  }});