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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

Plus to menu morph

When to use

A small circular trigger (a "+" FAB, a compose button, an add-action affordance) that morphs into the menu / panel it opens instead of popping a separate surface next to it. The button's box grows in width / height and relaxes its corner radius into a rounded panel while the plus icon cross-fades + rotates out and the menu content slides in.

Reach for this over menu dropdown when the trigger and the surface are the same element (the button becomes the panel). Use plain menu dropdown when the surface is a distinct popover that merely grows from the trigger's corner.

HTML usage

html
<div class="t-morph" data-open="false">  <div class="t-morph-menu"> … menu items … </div>  <button class="t-morph-plus" aria-expanded="false">+</button></div>

Toggle data-open on the container (and aria-expanded on the button). CSS animates the surface size + corner radius and cross-fades the plus ↔ menu. Wrap the morph in a relatively-positioned anchor sized to the OPEN footprint if you want it to grow out of a fixed corner.

Tunable variables

VariableDefaultNotes
--morph-open-dur350mssourced from --p20-open-dur
--morph-close-dur250mssourced from --p20-close-dur
--morph-easecubic-bezier(0.34, 1.25, 0.64, 1)sourced from --p20-ease
--morph-close-easecubic-bezier(0.22, 1, 0.36, 1)sourced from --p20-close-ease
--morph-r-closed40pxsourced from --p20-r-closed
--morph-r-open20pxsourced from --p20-r-open
--morph-fade-dur200mssourced from --p20-fade-dur
--morph-slide40pxsourced from --p20-slide-in-shift
--morph-rotate45degsourced from --p20-rotate
--morph-scale0.97sourced from --p20-scale
--morph-blur2pxsourced from --p20-blur

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 {  --morph-open-dur: 350ms;  --morph-close-dur: 250ms;  --morph-ease: cubic-bezier(0.34, 1.25, 0.64, 1);  --morph-close-ease: cubic-bezier(0.22, 1, 0.36, 1);  --morph-r-closed: 40px;  --morph-r-open: 20px;  --morph-fade-dur: 200ms;  --morph-slide: 40px;  --morph-rotate: 45deg;  --morph-scale: 0.97;  --morph-blur: 2px;}

CSS

css
/* Closed: a small circular button. Open: a rounded panel.   Width/height/border-radius animate; the open state uses a   bouncier ease than the close. */.t-morph {  position: relative;  width: 40px;  height: 40px;  border-radius: var(--morph-r-closed);  overflow: hidden;  transition:    width var(--morph-close-dur) var(--morph-close-ease),    height var(--morph-close-dur) var(--morph-close-ease),    border-radius var(--morph-close-dur) var(--morph-close-ease);}.t-morph[data-open="true"] {  width: 183px;  height: 172px;  border-radius: var(--morph-r-open);  transition:    width var(--morph-open-dur) var(--morph-ease),    height var(--morph-open-dur) var(--morph-ease),    border-radius var(--morph-open-dur) var(--morph-ease);}/* Plus fades + slides out and the icon rotates into an ×. */.t-morph-plus {  position: absolute;  inset: auto 0 0 auto;  width: 40px; height: 40px;  display: grid; place-items: center;  border: 0; background: transparent; cursor: pointer;  transition:    opacity var(--morph-fade-dur) var(--morph-close-ease),    transform var(--morph-open-dur) var(--morph-close-ease),    filter var(--morph-fade-dur) var(--morph-close-ease);}.t-morph-plus svg {  transition: transform var(--morph-open-dur) var(--morph-close-ease);}.t-morph[data-open="true"] .t-morph-plus {  opacity: 0;  transform: translateX(calc(-1 * var(--morph-slide)));  filter: blur(var(--morph-blur));  pointer-events: none;}.t-morph[data-open="true"] .t-morph-plus svg {  transform: scale(var(--morph-scale)) rotate(var(--morph-rotate));}/* Menu starts slid in + scaled + blurred; reveals on open. */.t-morph-menu {  position: absolute;  inset: 0;  opacity: 0;  transform: translateX(var(--morph-slide)) scale(var(--morph-scale));  filter: blur(var(--morph-blur));  pointer-events: none;  transition:    opacity var(--morph-fade-dur) var(--morph-close-ease),    transform var(--morph-open-dur) var(--morph-close-ease),    filter var(--morph-fade-dur) var(--morph-close-ease);}.t-morph[data-open="true"] .t-morph-menu {  opacity: 1;  transform: translateX(0) scale(1);  filter: blur(0);  pointer-events: auto;}
@media (prefers-reduced-motion: reduce) {  .t-morph, .t-morph-plus, .t-morph-menu { 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
// Toggle data-open on the container; CSS owns the morph. Mirror the// state to aria-expanded and close on outside click / Escape.const morph = document.querySelector(".t-morph");const plus = morph.querySelector(".t-morph-plus");
function setOpen(open) {  morph.setAttribute("data-open", String(open));  plus.setAttribute("aria-expanded", String(open));}
plus.addEventListener("click", (e) => {  e.stopPropagation();  setOpen(morph.getAttribute("data-open") !== "true");});document.addEventListener("click", (e) => {  if (!morph.contains(e.target)) setOpen(false);});document.addEventListener("keydown", (e) => {  if (e.key === "Escape") setOpen(false);});

Pin the plus button to a corner

The plus button must overlay the panel, pinned to a corner (inset: auto 0 0 auto), so it stays put while the box grows up-and-left out of it. If it's in normal flow it gets shoved around as the container resizes. overflow: hidden on .t-morph is load-bearing — it clips the menu content during the size morph so items don't spill outside the growing rounded box.

Open and close use different eases

The bouncy --morph-ease only drives the open; the close falls back to the calm --morph-close-ease. Don't collapse them into one variable. Adjust the open width / height in the snippet to your real panel size — they're hardcoded, not derived from the content.