A lightweight, zero-dependency JavaScript plugin to lazy-load HTML sections with animations using the Intersection Observer API.
You can install the plugin via NPM or use it directly via CDN.
npm install lazyload_html
import lazyload_html;Or, you can use this package via a CDN:
<script src="https://cdn.jsdelivr.net/npm/lazyload_html@latest" async></script><!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>JavaScript Lazy Loading Sections</title>
</head>
<body>
<section data-lazy> <!--Add data-lazy attribute to any section to lazy load -->
<h2>Welcome</h2>
<p>This section will fade in when it enters the viewport.</p>
</section>
<script src="https://cdn.jsdelivr.net/npm/lazyload_html@latest" async></script>
</body>
</html>🔍 IntersectionObserver-based: Efficient and native — no scroll event listeners or performance hacks.
🎨 Smooth Fade-In Animation: Content fades in beautifully as it enters the viewport. Easy to customize via CSS.
🪶 Zero Dependencies: Just plain JavaScript. No jQuery, no frameworks, no bloat.
⚡ Tiny Footprint: Under 1KB when minified — optimized for speed and mobile performance.
🔧 Drop-In Integration: Just add data-lazy to your HTML elements — no config required.
🧱 Modular-Friendly: Use via <script> tag or import in modern JS/ESM environments.
🔄 One-Time Activation: Each section is revealed only once — no repeated observers.
✍️ Customizable Animation: Change transitions, duration, or add sliding effects with a few lines of CSS.
📦 Ready for NPM/CDN: Available as an NPM package or standalone JS file — use it how you like.
✅ Fully Browser-Compatible: Works on all modern browsers. Supports older ones with a simple polyfill.
MIT License
Copyright (c) 2025 Ankit Arora
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.