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Web css animations

Skill BjornMelin/dev-skills/plugins/web-motion/skills/web-css-animations

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Install
npx -y skills add BjornMelin/dev-skills --skill web-css-animations

Assembled from the repository path, not quoted from the project. Check it against their README if it does not work.

2 things to look at

  • no licenseNo license file was found in the repository. Code published without one is not open source by default, so using it at work is a question for whoever answers licensing questions where you are.
  • 3 stars3 stars. Stars are a popularity signal and not a quality one, but at this level it is likely that nobody has read this closely except its author, and you would be relying on your own review.

What its author says it does

Copied from the file, not written here

Use this skill for Browser CSS transitions, keyframes, scroll-driven animations, registered properties, discrete transitions, reduced motion, and performance-safe CSS motion. Trigger on CSS transition, @keyframes, animation-timeline, prefers-reduced-motion, @starting-style, transition-behavior, CSS animation. Do not use for near-miss tasks outside these boundaries; route to adjacent motion or platform skills when they own the implementation.

The file declares its own license as MIT. That is the author’s claim about this one file, and it is not the same thing as the license GitHub reports for the repository, which is listed with the other numbers below.

SKILL.md

4.9 KB, as published. Nobody here has run it

Web CSS Animations

Browser CSS transitions, keyframes, scroll-driven animations, registered properties, discrete transitions, reduced motion, and performance-safe CSS motion.

Operating Contract

Use this skill as a compact router plus domain checklist. Load references only when the current task matches their condition. Do not cite local scrape paths, machine cache paths, or hidden source locations. Verify API details against the target repo's installed package versions before editing.

Source Order

  1. Inspect the target repo's installed packages, framework/runtime versions, local design tokens, accessibility policy, and existing motion patterns.
  2. Use the bundled references below for skill-specific gotchas and copied source excerpts.
  3. Use official current docs/package source as API truth when local code or bundled notes are version-sensitive.

Decision Boundaries

  • Use CSS first for two-state UI motion.
  • Move to WAAPI when an Animation object or seeking is needed.
  • Move to GSAP for complex imperative choreography.

Workflow

  1. Identify the state driver and animated properties.
  2. Use explicit transition-property lists and product motion tokens.
  3. Add reduced-motion behavior beside the motion.
  4. Guard new CSS with @supports or local browser policy.

Gotchas

  • transition: all hides expensive accidental properties.
  • Unregistered custom properties animate discretely.
  • animation shorthand resets animation-timeline, so set timeline after shorthand.
<!-- skill-resources:start -->

Bundled Resources

  • references/css-motion-field-guide.md - CSS transition/keyframe field guide. Read before implementing ordinary CSS state motion.
  • references/browser-support-and-accessibility.md - Support, @supports, and reduced-motion notes. Read for newer CSS features or accessibility review.
  • references/property-performance-matrix.md - CSS property performance matrix. Read for transform, opacity, layout, paint, filter, shadow, and text animation risk.
  • references/scroll-driven-and-view-timelines.md - Scroll-driven and view-timeline CSS motion. Read when using animation-timeline, scroll(), view(), timeline ranges, or CSS scroll-driven animation instead of JavaScript scroll handlers.
  • references/discrete-entry-exit-transitions.md - Discrete entry and exit transitions. Read when animating display, content-visibility, popovers, dialogs, @starting-style, or transition-behavior.
  • references/docs-css-modern-motion-notes.md - Source-backed notes and links. Load when exact upstream API detail may have changed.
  • references/docs-mdn-css-animations.md - MDN CSS animations routing notes. Load when reviewing @keyframes and animation-* behavior.
  • references/docs-mdn-css-transitions.md - MDN CSS transitions routing notes. Load when reviewing transition-* behavior.
  • references/docs-mdn-prefers-reduced-motion.md - MDN reduced-motion routing notes. Load when reviewing CSS reduced-motion behavior.
  • references/docs-browser-motion-performance.md - Source-backed browser performance notes. Load when checking property or compositor risk.
  • references/index.md - Complete reference inventory and routing summary.
  • references/source-ledger.md - Source list, checked date, and copy policy.
  • references/provenance.json - Machine-readable source and local-resource metadata.
  • scripts/audit.mjs - Self-contained audit CLI; run doctor before scan when setup is unclear.
  • assets/templates/web-css-animations-audit-report.md - Audit response/report template.
  • assets/templates/web-css-animations-review-checklist.md - Manual review checklist.
  • assets/examples/web-css-animations-starter.css - Starter fixture/example for this skill.
  • evals/trigger-queries.json - Trigger/near-miss eval set for description tuning.
  • evals/evals.json - Task-quality evals with assertions.
<!-- skill-resources:end -->

Audit CLI

node scripts/audit.mjs doctor --root . --format json
node scripts/audit.mjs scan --root . --format markdown
node scripts/audit.mjs scan --root . --format json --output web-css-animations-audit.json

Treat script findings as leads. Verify every finding against current code before changing behavior or reporting it as valid.

Closeout

Before finalizing, run the repo's focused validation command, this skill's audit CLI when relevant, and any browser/device/manual proof required by the changed surface. Report commands run, findings fixed, findings skipped with reasons, and residual risk.

Gives 0 of the 12 instructions most css styling skills give

Counted across 586 of the 596 authors here whose files we hold, read 2026-08-06

  • avoid excessive centered layoutsin 55 of 586, across 12 files
  • bundle code into single HTML filein 54 of 586, across 14 files
  • Respect prefers-reduced-motion user settingsin 52 of 586, across 35 files
  • avoid purple gradientsin 51 of 586, across 11 files
  • avoid uniform rounded cornersin 51 of 586, across 11 files
  • avoid Inter fontin 51 of 586, across 11 files
  • edit generated files to develop artifactin 50 of 586, across 10 files
  • animate only transform and opacity propertiesin 43 of 586
  • Make touch targets at least 44x44 pixelsin 41 of 586, across 15 files
  • Ensure minimum color contrast of 4.5:1in 39 of 586, across 10 files
  • use tailwind cssin 39 of 586, across 24 files
  • Use SVG icons instead of emojisin 38 of 586, across 11 files

Said here and by no other author read

  • load references only when matching task conditions
  • inspect installed packages and existing motion patterns
  • use css first for two-state ui motion
  • move to waapi when seeking is needed
  • move to gsap for complex imperative choreography
  • identify state drivers and animated properties

Grouped from the skills themselves: near-identical wordings counted once, and counted by distinct author, so one author publishing three of these counts once.

Keep looking

Skills are one crate of 328,083. Ordering is by how many stacks a row turns up in, so the top of any crate is what has actually been picked rather than what has the most stars.