web-animation-perf SKILL.md skillA
web-animation-perf from swyxio/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add swyxio/skills/web-animation-perf@git:20260530.caa957bPins git:20260530.caa957b in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- swyxio/skills
- Path
web-animation-perf/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260530.caa957b, committed May 30, 2026
- First version recorded
- May 28, 2026
- Size
- 9,386 bytes
- Repository stars
- 194
- License
- MIT
Prevent layout/transition/reflow thrash in JS-driven CSS animations. Use when building or debugging continuous motion (rotation, orbit, parallax, scroll-linked effects, marquee, carousels) and when symptoms appear like jank, stutter, lag, animation drift, ghosting, "elements collapsing toward center", "going slow", "should we use canvas?", or when mixing `setInterval`/React state with CSS `transition`.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Web Animation Performance Guidance for writing smooth, GPU-accelerated animations on the web. Most jank comes from three avoidable mistakes; the rest is diagnostic technique. ## The Three Cardinal Rules ### 1. Never combine `transition: all <duration>` with JS that updates the same property every frame This is the single most common animation bug. If JS updates `left`/`top`/`transform` on every tick AND the element has `transition-all duration-700` (or similar), CSS will linearly interpolate between every pair of successive JS values over the transition duration. For non-linear motion (orbit, arc, easing curve) the linear chord cuts across the intended path — e.g., rotating nodes appear to drift inward toward the center, parallax elements ghost-trail, scroll-linked effects lag noticeably behind the scroll. Pick exactly one driver: - **Pure CSS**: `@keyframes` + `animation: spin 8s linear infinite` and let the browser handle it. - **Pure JS**: set the *final* position every frame; no `transition` on that property. Use a separate, narrower `transition` only for state changes (e.g., active/inactive scale and color). …
Read the whole file at its exact version.
How to install
mdr add swyxio/skills/web-animation-perf@sha256:9d4a5cefda3041fbThe line at the top of this page pins the label git:20260530.caa957b, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_yqcxw26i7o4uzjjw)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between May 28, 2026 and May 30, 2026, about one every day.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260530.caa957b latest | 2026-05-30 | caa957b | 9,386 B | A | view · diff |
| git:20260528.839ae03 | 2026-05-28 | 839ae03 | 2,524 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (9386 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
swyxio/skills · 194 stars · license MIT · pushed 2026-11-03 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_yqcxw26i7o4uzjjw GET https://markdownregistry.com/api/v1/resolve?ref=swyxio/skills/web-animation-perf GET https://markdownregistry.com/api/v1/blob/9d4a5cefda3041fbd334d2ad9dbdd6419c5e245d2c72fa3e10733889db6e1f40
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.