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.
Install
npx skills add https://github.com/Jakubantalik/transitions.dev --skill transitions-devCheckbox check
When to use
Checkboxes, to-do completion, multi-select rows — any boolean control where the checked state should feel earned. The box's background fills first, then the checkmark draws itself via stroke-dashoffset after a short delay; unchecking reverses quickly with no draw.
Toggle aria-checked on the control. Like success check, the draw needs stroke-dasharray calibrated to your actual path length (path.getTotalLength()).
HTML usage
Toggle aria-checked. The box fills, then the check stroke
draws in via stroke-dashoffset. Set --check-len to the path's
getTotalLength() (rounded up) so it never over/under-draws;
transitioning offset lets a mid-draw uncheck reverse cleanly.
Tunable variables
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
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
None — pure CSS. Toggle the documented HTML attributes or class names from whatever already drives state in your app.