Pure JavaScript Library For Lazy Loading Images – lazyload.js
lazyload.js is a stand-alone JavaScript library for lazy loading images without any dependencies.
JavaScript & CSS lazy load
Progressively Load Images & Iframes Using Plain JavaScript – ProgressiveMedia
The ProgressiveMedia is a vanilla JavaScript plugin used to loads images and iframes progressively as they’re scrolled into view.
Performant Element lazy Load Library – Lozad
Lozad is a small, highly performant JavaScript library used to lazy load any html elements (e.g. images, videos, etc.) using Intersection Observer Web API.
Responsive Image Lazy Load JS Library – lazysizes
lazysizes is an easy yet robust JS library used to delay the loading of images (iframes, scripts, etc) until they come into view.
Small Image Lazy Loader – yall.js
yall.js is a really small JavaScript library to lazy load images as the users scroll through your content heavy webpage. Supports srcset attribute and picture element.
Web Preloader & Lazy Loader Library – Loader
Loader is a powerful JavaScript library used to preload or lazy load ‘Heavy’ HTML elements on the webpage, such as images, audios, videos, iframes, and etc.
Load Youtube Video Only When Needed – Youtube LazyLoad
Yet another Youtube lazy loader that delays the loading of Youtube video player to improve the performance of your web page.
Animated Image Lazy Loader With Broken Image Fallback – rogano-lazy
rogano-lazy is a modern image lazy loader written in pure JavaScript without any 3rd dependencies.
Defer Loading Of Images And CSS Classes & Styles Using JavaScript – safe-defer.js
safe-defer.js is an SEO-friendly JavaScript lazy load library that has the ability to defer the loading of images, CSS classes, and inline CSS styles to improve your page load time.
Intersection Observer Based Image Lazy Load Library – io-lazyload
io-lazyload is an extremely fast JavaScript library for lazy loading images that uses IntersectionObserver API to handle image position detection.