animation-on-scroll

MengTo/Skills · Agent Skill

Use when you need scroll-driven motion that feels intentional instead of noisy or overdone.

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Overview

PublisherMengToCommunity
RepositoryMengTo/Skills ↗
Skill folderanimation-on-scroll
Stars7,038
Forks819
Bundled files4
LicenseMIT
Last updatedOctober 25, 2026
LinksSkill source ↗ · Repository ↗

Mozgi check

What we found in the skill files. Details come with a subscription.

Security
low risk · no obvious risks found — the full report shows the details
Compatibility
instructions only — works with most agents
Similar skills
58 similar skills found
Also with subscription

Installation

A skill is a folder with a SKILL.md file. Pick your agent and run the commands in a terminal (macOS, Linux or Git Bash on Windows) from your project root.

Copy the prompt into Claude, Codex or another assistant: it will review the skill and install it for you.

Install the “animation-on-scroll” skill from mozgi.io (https://mozgi.io/skills/mengto-animation-on-scroll/) for me.

1. Download the archive: https://mozgi.io/skills/mengto-animation-on-scroll/download
   If it fails, take the skill folder from the source: https://github.com/MengTo/Skills/tree/main/agent-skills/web-design/animation-on-scroll
2. Read SKILL.md and the other files. Check the skill is safe: no hidden commands, no sending data elsewhere, no scripts doing something other than described. If anything looks suspicious, stop and tell me.
3. Put the “animation-on-scroll” folder into your agent's skills folder: .claude/skills/ for Claude Code, .agents/skills/ for Codex, .cursor/skills/ for Cursor, .gemini/skills/ for Gemini CLI. Inside the project if we are in one, otherwise in the home folder (~/.claude/skills/ etc.).
4. Make sure <skills folder>/animation-on-scroll/SKILL.md exists.
5. Briefly tell me what this skill does and offer to try it on my task.

If you cannot do a step yourself, tell me what to click or type.

Review the source files

4 files Download Zip

Read SKILL.md and any companion files before deciding whether to install. Click a file to preview it.

SKILL.md contents

Original author text · read-only

Animation On Scroll Skill

Workflow

1. Confirm animation style, timing, and whether animations should run once or repeat.

2. Provide the keyframes + JS observer snippet and the exact Tailwind class to apply.

3. 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-scroll to 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 threshold and rootMargin for earlier/later reveals.
  • Repeat: set once = false to allow replays when re-entering.
  • Motion: tweak translateY and blur in 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?

Frequently asked questions

What does the animation-on-scroll skill do?

Use when you need scroll-driven motion that feels intentional instead of noisy or overdone.

How do I install animation-on-scroll?

Open the “Installation” block on this page and pick your agent — Claude Code, Codex, Cursor or Gemini CLI — for ready-made commands that copy the skill folder to the right place. Or copy the prompt from the “Via assistant” tab and let the assistant review and install the skill.

Which AI models work with animation-on-scroll?

Skills are plain Markdown instructions (the Agent Skills format), so animation-on-scroll works with any agent that reads SKILL.md: Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot, OpenCode and more. The model loads the instructions only when a task matches the skill's description.

Is animation-on-scroll free?

The skill is published openly by MengTo under the MIT license. The skill itself costs nothing — you only pay your AI provider for the tokens you use.

Is it safe to install skills?

A skill is a set of instructions your agent will follow, so read SKILL.md and its companion files before installing. Scripts in the skill folder only run if your agent runs them — keep an eye on what it does and do not grant unnecessary permissions.

How is a skill different from an MCP server or a plugin?

An MCP server or plugin gives the model new tools — code that runs and returns a result. A skill gives it knowledge and process: how to approach a task, which steps to follow and what good output looks like. It needs no server or API key.

Related skills

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