Animation On Scroll
Meng ToCommunityCreated by Meng To
- Skill
- Tool integration
- Software development
- MIT
- No issues found
AutoGineer summary
Written by AutoGineer from the skill’s own files, not by the author
This skill provides a structured workflow for adding scroll-reveal animations to web elements. It utilizes the IntersectionObserver API to detect when elements enter the viewport and triggers CSS keyframe animations. The approach is designed to integrate seamlessly with Tailwind CSS by leveraging arbitrary value syntax for animation properties, allowing for highly customizable motion effects like fades, slides, and blurs.
What it does
- Provides a reusable JavaScript snippet to observe element visibility.
- Defines CSS keyframes for smooth entrance animations.
- Offers a method to apply animations using Tailwind CSS classes.
- Includes configuration options for animation timing and trigger sensitivity.
- Supports both one-time reveals and repeatable animations.
When to use it
- When you need elements to animate as the user scrolls down the page.
- When implementing scroll-reveal effects for landing pages or portfolios.
- When you want to sequence animations for better visual engagement.
- When you need a lightweight, dependency-free solution for scroll-based motion.
Advantages
- Lightweight implementation using native browser APIs.
- Highly compatible with Tailwind CSS utility classes.
- Easy to customize animation duration, delay, and motion style.
- Flexible trigger points via threshold and rootMargin adjustments.
Usage examples
- “How do I make my hero section fade in when the user scrolls to it?”
- The agent provides the keyframe CSS, the IntersectionObserver script, and the specific Tailwind class to add to the hero div.
- “Can I make the animation repeat every time I scroll back to the element?”
- The agent instructs you to set the 'once' variable to 'false' within the provided JavaScript snippet.
Install
Download the skill as a ZIP:
https://autogineer.com/agent-skills/mengto/animation-on-scroll/downloadUnzip it into the cross-client skills folder of your project:
mkdir -p .agents/skills && unzip animation-on-scroll.zip -d .agents/skills
Documentation by Meng To
Animation On Scroll Skill
Workflow
Confirm animation style, timing, and whether animations should run once or repeat.
Provide the keyframes + JS observer snippet and the exact Tailwind class to apply.
Offer focused tweaks only (threshold, rootMargin, duration, delay, transform/blur values).
Usage checklist
Insert the JS snippet in the
<head>after the keyframes.Add the animation class and
animate-on-scrollto elements.Ensure your keyframes name matches the Tailwind animation reference.
IntersectionObserver trigger
<script>
/*
Sequence animation on scroll when visible. Requires Animation Keyframe. Usage:
1) Insert this code in the <head> along with the Animation Keyframe code.
2) Add to Tailwind Classes: [animation:animationIn_0.8s_ease-out_0.1s_both] animate-on-scroll
*/
(function () {
// Inject CSS for paused/running states
const style = document.createElement("style");
style.textContent = `
/* Default: paused */
.animate-on-scroll { animation-play-state: paused !important; }
/* Activated by JS */
.animate-on-scroll.animate { animation-play-state: running !important; }
`;
document.head.appendChild(style);
const once = true;
if (!window.__inViewIO) {
window.__inViewIO = new IntersectionObserver((entries) => {
entries.forEach((entry) => {
if (entry.isIntersecting) {
entry.target.classList.add("animate");
if (once) window.__inViewIO.unobserve(entry.target);
}
});
}, { threshold: 0.2, rootMargin: "0px 0px -10% 0px" });
}
window.initInViewAnimations = function (selector = ".animate-on-scroll") {
document.querySelectorAll(selector).forEach((el) => {
window.__inViewIO.observe(el); // observing twice is a no-op
});
};
document.addEventListener("DOMContentLoaded", () => initInViewAnimations());
})();
</script>Keyframes
<style>
/*
Sequence animation intro. Usage:
1) Insert this code in the <head>
2) Add to Tailwind Classes: [animation:animationIn_0.8s_ease-out_0.1s_both]
*/
@keyframes animationIn {
0% {
opacity: 0;
transform: translateY(30px);
filter: blur(8px);
}
100% {
opacity: 1;
transform: translateY(0);
filter: blur(0px);
}
}
</style>Tailwind example
<div class="animate-on-scroll [animation:animationIn_0.8s_ease-out_0.1s_both]">
...
</div>Customization knobs
Trigger: adjust
thresholdandrootMarginfor earlier/later reveals.Repeat: set
once = falseto allow replays when re-entering.Motion: tweak
translateYandblurin keyframes.Timing: change duration and delay in the Tailwind animation value.
Common pitfalls
Forgetting to include the keyframes before the JS snippet.
Using a different keyframe name than in the Tailwind animation.
Animations not running because the element is already in view before observer init.
Questions to ask when specs are missing
Should animations run once or every time the element re-enters?
How far before entering the viewport should they start?
What motion style (fade, slide, blur, scale) do you want?
Files
- ATTRIBUTION.mdAdded by AutoGineer860 B
- LICENSELicence file added by AutoGineer1.0 KiB
- SKILL.md3.5 KiB
- demo/PROMPT.md1.9 KiB
- demo/index.html16.1 KiB
- demo/preview.jpg61.9 KiB
demo/index.html
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="icon" href="data:,">
<title>Animation On Scroll · Skill Demo</title>
<style>:root{--bg:#080a0f;--panel:rgba(18,21,29,.72);--panelStrong:#121620;--ink:#f2f5f7;--muted:#929aa7;--line:rgba(255,255,255,.14);--accent:hsl(42 92% 68%);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--bg)}
*{box-sizing:border-box}html{background:var(--bg);scroll-behavior:smooth}body{min-width:320px;margin:0;background:radial-gradient(circle at var(--mx,76%) var(--my,16%),color-mix(in srgb,var(--accent) 16%,transparent),transparent 34%),var(--bg);color:var(--ink)}button,a{font:inherit;color:inherit}button{border:1px solid var(--line);border-radius:999px;padding:11px 15px;background:var(--panel);cursor:pointer}button:hover,button:focus-visible{border-color:var(--accent);outline:2px solid color-mix(in srgb,var(--accent) 42%,transparent);outline-offset:3px}.shell{width:min(1280px,calc(100% - 40px));min-height:100svh;margin:auto;padding:22px 0 40px}.topbar{display:flex;align-items:center;justify-content:space-between;padding:10px 0 30px;border-bottom:1px solid var(--line);font-size:11px;font-weight:700;letter-spacing:.13em;text-transform:uppercase}.brand{display:flex;gap:9px;align-items:center}.brand i{width:9px;height:9px;border-radius:50%;background:var(--accent);box-shadow:0 0 24px var(--accent)}.topbar a{text-decoration:none}.intro{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(260px,.75fr);gap:44px;align-items:end;padding:clamp(54px,9vw,116px) 0 42px}.intro small{display:block;margin-bottom:22px;color:var(--muted);font-size:10px;font-weight:700;letter-spacing:.16em;text-transform:uppercase}.intro h1{max-width:11ch;margin:0;font-size:clamp(48px,8vw,112px);font-weight:580;letter-spacing:-.075em;line-height:.86}.intro p{max-width:48ch;margin:0;color:var(--muted);font-size:clamp(14px,1.2vw,18px);line-height:1.6}.showcase{position:relative;min-height:470px;overflow:hidden;border:1px solid var(--line);border-radius:18px;background:var(--panel);isolation:isolate}.showcaseHeader{position:absolute;z-index:5;top:18px;right:18px;left:18px;display:flex;justify-content:space-between;color:var(--muted);font-size:9px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;pointer-events:none}.layoutStudy{display:grid;grid-template-columns:1.15fr .85fr;min-height:470px}.layoutHero{display:flex;flex-direction:column;justify-content:flex-end;padding:clamp(28px,5vw,70px);border-right:1px solid var(--line)}.layoutHero>span,.kicker{color:var(--muted);font-size:10px;font-weight:700;letter-spacing:.14em;text-transform:uppercase}.layoutHero h2,.landing h2{max-width:9ch;margin:18px 0;font-size:clamp(42px,6vw,84px);line-height:.9;letter-spacing:-.065em}.layoutHero p,.landing p{max-width:38ch;color:var(--muted);line-height:1.55}.layoutCards{display:grid;grid-template-rows:repeat(3,1fr)}.layoutCards article{display:flex;align-items:end;justify-content:space-between;padding:26px;border-bottom:1px solid var(--line)}.layoutCards article:last-child{border:0}.layoutCards b{color:var(--accent);font-size:34px}.layoutCards span{text-transform:uppercase;font-size:10px;letter-spacing:.15em}.pricing{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;min-height:470px;background:var(--line)}.pricing article{display:flex;flex-direction:column;padding:80px 28px 28px;background:var(--panelStrong)}.pricing article.featured{background:linear-gradient(160deg,color-mix(in srgb,var(--accent) 20%,var(--panelStrong)),var(--panelStrong))}.pricing p{font-size:11px;letter-spacing:.13em;text-transform:uppercase}.pricing strong{margin:24px 0 8px;font-size:56px;letter-spacing:-.06em}.pricing span{color:var(--muted)}.pricing button{margin-top:auto}.landing{display:flex;min-height:470px;flex-direction:column;justify-content:center;padding:clamp(40px,8vw,100px);background:radial-gradient(circle at 75% 36%,color-mix(in srgb,var(--accent) 45%,transparent),transparent 24%)}.landing .actions{display:flex;gap:10px;margin-top:24px}.landing .actions button:first-child{color:var(--bg);background:var(--ink)}.landing .proof{display:flex;gap:28px;margin-top:54px;color:var(--muted);font-size:11px}.marquee{display:flex;min-height:470px;align-items:center;overflow:hidden;-webkit-mask-image:linear-gradient(90deg,transparent,#000 15%,#000 85%,transparent);mask-image:linear-gradient(90deg,transparent,#000 15%,#000 85%,transparent)}.marqueeTrack{display:flex;width:max-content;animation:marquee 18s linear infinite}.marqueeTrack span{min-width:220px;padding:34px;border:1px solid var(--line);font-size:22px;font-weight:700;letter-spacing:-.04em;text-align:center}.iconGrid,.contactSheet{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;min-height:470px;background:var(--line)}.iconGrid article,.contactSheet article{position:relative;padding:70px 28px 28px;background:var(--panelStrong)}.number{position:absolute;top:22px;right:22px;color:var(--accent);font-size:11px}.glyph{display:grid;width:110px;height:110px;place-items:center;margin:30px auto;border:1px solid var(--line);border-radius:34px;background:linear-gradient(145deg,color-mix(in srgb,var(--accent) 20%,transparent),transparent);font-size:48px}.iconGrid h3{text-align:center}.contactSheet .asset{height:280px;margin-bottom:22px;border-radius:2px;background-size:cover}.assetOne{background:radial-gradient(circle at 70% 30%,#d9f7ff,transparent 20%),linear-gradient(145deg,#203962,#8db3d6 48%,#d7d5c8)}.assetTwo{background:radial-gradient(circle at 50% 28%,#f1c6a2 0 10%,transparent 11%),linear-gradient(120deg,#1b2738,#754c5a 52%,#e1a77f)}.assetThree{background:repeating-radial-gradient(circle at 30% 65%,#c8b8ff 0 9px,#4c4274 10px 18px,#151629 19px 29px)}.contactSheet b,.contactSheet span{display:block}.contactSheet span{margin-top:8px;color:var(--muted);font-size:11px}.surfaceStudy{display:grid;grid-template-columns:1.4fr .6fr;grid-template-rows:1fr auto;gap:18px;min-height:470px;padding:70px 24px 24px}.surfaceStudy article{border:1px solid var(--line);border-radius:20px;background:linear-gradient(145deg,color-mix(in srgb,var(--accent) 12%,var(--panelStrong)),var(--panelStrong))}.surfaceHero{display:flex;grid-row:1/3;flex-direction:column;justify-content:flex-end;padding:42px}.surfaceHero strong{max-width:8ch;margin-top:20px;font-size:clamp(40px,5vw,72px);line-height:.92;letter-spacing:-.06em}.surfaceHero span,.surfaceCard span{color:var(--muted);font-size:10px;letter-spacing:.14em;text-transform:uppercase}.surfaceCard{display:flex;flex-direction:column;padding:26px}.surfaceCard b{margin:auto 0 4px;font-size:56px}.surfaceCard small{color:var(--muted)}.surfaceControl{align-self:end}.motionStage{display:flex;min-height:470px;flex-direction:column;justify-content:center;padding:70px clamp(28px,7vw,90px)}.maskLine{overflow:hidden;margin:0;font-size:clamp(44px,7vw,98px);font-weight:600;letter-spacing:-.075em;line-height:.84}.maskLine span{display:block;transform:translateY(110%);animation:wordIn .8s cubic-bezier(.16,1,.3,1) forwards}.maskLine:nth-child(2) span{animation-delay:.12s}.maskLine:nth-child(3) span{animation-delay:.24s}.accentLine{color:var(--accent)}.timeline{display:flex;gap:8px;margin:42px 0 20px}.timeline i{width:58px;height:3px;background:var(--line);transform-origin:left;animation:grow .8s .42s both}.timeline i:nth-child(2){animation-delay:.54s}.timeline i:nth-child(3){animation-delay:.66s}.timeline i:nth-child(4){animation-delay:.78s}.replay{width:max-content}.visualization{position:relative;min-height:470px}.visualization canvas{position:absolute;inset:0;width:100%;height:100%}.vizMeta{position:absolute;right:28px;bottom:24px;left:28px;display:grid;grid-template-columns:1fr auto 1fr;align-items:end;color:var(--muted);font-size:10px;letter-spacing:.14em;text-transform:uppercase}.vizMeta strong{color:var(--ink);font-size:48px;letter-spacing:-.06em}.vizMeta span:last-child{text-align:right}.simulation{position:relative;min-height:470px}.goo{position:absolute;inset:0;width:100%;height:100%}.goo circle{fill:var(--accent)}.orbA{animation:orbA 4.4s ease-in-out infinite alternate}.orbB{animation:orbB 5.1s ease-in-out infinite alternate}.reset{position:absolute;right:24px;bottom:24px}.demoNote{display:flex;justify-content:space-between;gap:24px;padding:20px 2px;color:var(--muted);font-size:11px;line-height:1.5}.demoNote a{color:var(--ink)}
.pricingWrap{min-height:470px;padding-top:52px}.billingBar{display:flex;align-items:center;justify-content:space-between;min-height:58px;padding:8px 20px;border-top:1px solid var(--line);color:var(--muted);font-size:10px;letter-spacing:.12em;text-transform:uppercase}.billingBar .billingToggle{padding:8px 12px;background:var(--panelStrong);font-size:10px}.pricingWrap .pricing{min-height:360px}.pricingWrap .pricing article{padding:42px 28px 28px}.vizMeta button{justify-self:end;padding:8px 11px;font-size:9px;letter-spacing:.1em;text-transform:uppercase}
@keyframes marquee{to{transform:translateX(-50%)}}@keyframes wordIn{to{transform:translateY(0)}}@keyframes grow{from{transform:scaleX(0)}to{transform:scaleX(1)}}@keyframes orbA{to{transform:translate(-120px,70px)}}@keyframes orbB{to{transform:translate(80px,120px)}}@media(max-width:760px){.intro{grid-template-columns:1fr;padding-top:60px}.intro h1{font-size:54px}.layoutStudy,.pricing,.iconGrid,.contactSheet,.surfaceStudy{grid-template-columns:1fr}.layoutHero{border-right:0;border-bottom:1px solid var(--line)}.pricing article{min-height:320px}.surfaceHero{grid-row:auto}.showcase{min-height:540px}.topbar span:last-child{display:none}.demoNote{flex-direction:column}.landing .proof{flex-direction:column;gap:8px}.vizMeta{grid-template-columns:1fr auto}.vizMeta span:last-child{display:none}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.marqueeTrack,.maskLine span,.timeline i,.orbA,.orbB{animation:none;transform:none}}</style>
</head>
<body data-kind="motion" data-skill="animation-on-scroll">
<main class="shell">
<nav class="topbar" aria-label="Demo navigation"><a class="brand" href="#"><i></i>Animation On Scroll</a><span>Standalone skill reference · 01</span></nav>
<header class="intro">
<div><small>web design / reference demo</small><h1>Animation On Scroll</h1></div>
<p>Create an on-scroll animation trigger using IntersectionObserver with Tailwind-friendly animation classes and keyframes. Use when asked for scroll-reveal, animate-on-scroll, or sequencing element animations when they enter the viewport.</p>
</header>
<section class="showcase" aria-label="Animation On Scroll demonstration">
<div class="showcaseHeader"><span>Live example</span><span>motion</span></div>
<div class="motionStage">
<p class="maskLine"><span>Motion should</span></p>
<p class="maskLine"><span>explain the</span></p>
<p class="maskLine accentLine"><span>next state.</span></p>
<div class="timeline"><i></i><i></i><i></i><i></i></div>
<button class="replay">Replay sequence</button>
</div>
</section>
<footer class="demoNote"><span>Open <strong>PROMPT.md</strong> for the exact recreation and remix prompts.</span><a href="PROMPT.md">Read prompt →</a></footer>
</main>
<script>const reduced=matchMedia("(prefers-reduced-motion: reduce)").matches;addEventListener("pointermove",event=>{document.body.style.setProperty("--mx",event.clientX+"px");document.body.style.setProperty("--my",event.clientY+"px")},{passive:true});const billing=document.querySelector(".billingToggle");if(billing)billing.addEventListener("click",()=>{const annual=billing.getAttribute("aria-pressed")!=="true";billing.setAttribute("aria-pressed",String(annual));billing.textContent=annual?"Show monthly pricing":"Show annual pricing";document.querySelectorAll(".pricing strong").forEach(price=>price.textContent=annual?price.dataset.annual:price.dataset.monthly)});const replay=document.querySelector(".replay");if(replay)replay.addEventListener("click",()=>{document.querySelectorAll(".maskLine span,.timeline i").forEach(node=>{node.style.animation="none";node.offsetHeight;node.style.animation=""})});const reset=document.querySelector(".reset");if(reset)reset.addEventListener("click",()=>document.querySelectorAll(".orbA,.orbB").forEach(node=>{node.style.animation="none";node.offsetHeight;node.style.animation=""}));const canvas=document.querySelector("canvas");if(canvas&&!reduced){const context=canvas.getContext("2d");let width=0,height=0,frame=0,time=0;const mode="field";const bodies=Array.from({length:14},(_,i)=>({x:80+(i%7)*92,y:40+Math.floor(i/7)*70,vx:(i%3-1)*.7,vy:0,r:12+(i%4)*5}));const resetBodies=()=>bodies.forEach((body,i)=>{body.x=40+(i%7)*Math.max(32,(width-80)/6);body.y=35+Math.floor(i/7)*58;body.vx=(i%3-1)*.7;body.vy=0});const resetBodiesButton=document.querySelector(".resetBodies");if(resetBodiesButton)resetBodiesButton.addEventListener("click",resetBodies);const resize=()=>{const rect=canvas.getBoundingClientRect();const ratio=Math.min(devicePixelRatio||1,2);width=rect.width;height=rect.height;canvas.width=Math.round(width*ratio);canvas.height=Math.round(height*ratio);context.setTransform(ratio,0,0,ratio,0,0)};const draw=()=>{frame=requestAnimationFrame(draw);time+=.008;context.clearRect(0,0,width,height);const accent=getComputedStyle(document.documentElement).getPropertyValue("--accent").trim();if(mode==="globe"){const radius=Math.min(width,height)*.29;const cx=width*.5,cy=height*.47;context.fillStyle=accent;for(let i=0;i<360;i++){const phi=Math.acos(1-2*(i+.5)/360);const theta=Math.PI*(1+Math.sqrt(5))*i+time;const x=Math.sin(phi)*Math.cos(theta);const y=Math.cos(phi);const z=Math.sin(phi)*Math.sin(theta);const scale=(z+1.7)/2.7;context.globalAlpha=.16+.74*scale;context.beginPath();context.arc(cx+x*radius,cy+y*radius,Math.max(.7,2.2*scale),0,Math.PI*2);context.fill()}context.globalAlpha=.16;context.strokeStyle=accent;context.beginPath();context.ellipse(cx,cy+radius*.18,radius*1.34,radius*.34,time*.4,0,Math.PI*2);context.stroke()}else if(mode==="object"){const size=Math.min(width,height)*.24,cx=width*.5,cy=height*.48;const vertices=[[-1,-1,-1],[1,-1,-1],[1,1,-1],[-1,1,-1],[-1,-1,1],[1,-1,1],[1,1,1],[-1,1,1]];const edges=[[0,1],[1,2],[2,3],[3,0],[4,5],[5,6],[6,7],[7,4],[0,4],[1,5],[2,6],[3,7]];const points=vertices.map(([x,y,z])=>{const a=time*1.1,b=time*.73;const x1=x*Math.cos(a)-z*Math.sin(a),z1=x*Math.sin(a)+z*Math.cos(a),y1=y*Math.cos(b)-z1*Math.sin(b),z2=y*Math.sin(b)+z1*Math.cos(b),p=3.8/(z2+5);return{x:cx+x1*size*p,y:cy+y1*size*p,z:z2,p}});context.strokeStyle=accent;context.lineWidth=1.4;context.shadowColor=accent;context.shadowBlur=12;for(const [a,b] of edges){context.globalAlpha=.25+.45*((points[a].z+points[b].z+4)/8);context.beginPath();context.moveTo(points[a].x,points[a].y);context.lineTo(points[b].x,points[b].y);context.stroke()}context.fillStyle=accent;for(const point of points){context.globalAlpha=.55+.35*(point.z+2)/4;context.beginPath();context.arc(point.x,point.y,3.2*point.p,0,Math.PI*2);context.fill()}context.shadowBlur=0}else if(mode==="matter"){context.fillStyle=accent;for(const body of bodies){body.vy+=.16;body.x+=body.vx;body.y+=body.vy;if(body.x<body.r||body.x>width-body.r){body.vx*=-.94;body.x=Math.max(body.r,Math.min(width-body.r,body.x))}if(body.y>height-body.r-30){body.y=height-body.r-30;body.vy*=-.78}context.globalAlpha=.28+.45*(body.r/32);context.beginPath();context.arc(body.x,body.y,body.r,0,Math.PI*2);context.fill()}context.globalAlpha=.22;context.fillRect(0,height-31,width,1)}else{context.strokeStyle=accent;context.lineWidth=1;for(let i=0;i<18;i++){const y=(i/17)*height;context.globalAlpha=.08+.12*Math.sin(time+i*.4);context.beginPath();for(let x=0;x<=width;x+=12){const wave=Math.sin(x*.012+i*.54+time*3)*18*Math.sin(i/17*Math.PI);context.lineTo(x,y+wave)}context.stroke()}context.globalAlpha=.65;const x=width*(.52+.16*Math.sin(time*.6));const gradient=context.createLinearGradient(x,0,x+2,0);gradient.addColorStop(0,"transparent");gradient.addColorStop(.5,"white");gradient.addColorStop(1,"transparent");context.fillStyle=gradient;context.fillRect(x,0,3,height)}};resize();new ResizeObserver(resize).observe(canvas);const visibility=()=>{if(document.hidden){cancelAnimationFrame(frame);frame=0}else if(!frame)draw()};document.addEventListener("visibilitychange",visibility);draw();}</script>
</body>
</html>
Requirements and compatibility
Works with: Claude Code, Claude apps, OpenAI Codex, GitHub Copilot, Cursor, Gemini CLI, Kiro, OpenCode, Goose, Amp, Roo Code, JetBrains Junie, Factory Droid, Devin (ex-Windsurf), Mistral Vibe, OpenHands, Letta
“Works with” means the tool reads the open Agent Skills format; a skill written for one tool may use features others lack.
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No issues found by our static scan· No issues found
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Attribution and licence
- Created by
- Meng To
- Publisher
- Meng To (Community)
- Source
- MengTo/Skills · agent-skills/web-design/animation-on-scroll · commit 5ea1661
- Licence
- MIT License (redistribution allowed)
- LICENSE (added by AutoGineer from LICENSE)
- ATTRIBUTION.md (written by AutoGineer)
- Synced
AutoGineer is not affiliated with or endorsed by Meng To or Meng To.
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The ZIP holds the skill’s files, its licence files and an ATTRIBUTION.md. Download animation-on-scroll.zip