srcattribute of the image
yall.js is a featured-packed lazy loading script for
<iframe> elements and works with modern browsers.
Lozad.js is advanced performant Lazy Loader using Intersection Observer API.
It is written with an aim to lazy load images, ads, videos or any other element using the recently added Intersection Observer API with tremendous performance benefits.
jQuery Smartify loads images, calls Ajax, plays with css classes in on demand, while element is/or becoming visible in device Viewport. It's replacement of jQuery Lazyload.
responsivelyLazy is a nice lazy loading implementation that is responsive, truly lazy and SEO friendly.
Layzr.js is a small, fast, modern, and dependency-free library for lazy loading images.
Tada is a lightweight, no dependency library for lazy image load. jQuery plugin is also provided. Duplicate element check, throttled scroll handler, percent threshold supported.
A tiny jQuery plugin for lazy-loading Google Maps.
lazyFade.js is a jQuery plugin that fades a row of elements with a lazy effect. The fade of each next element gets delayed slightly what gives a precious touch to the whole transition.
bLazy is a lightweight lazy loading image script. It lets you lazy load and multi-serve your images so you can save bandwidth and server requests. The user will have faster load times and save data loaded if he/she doesn't browse the whole page.
lazysizes is a fast lazyloader for images (including responsive images), iframes and scripts/widgets without any dependency. It may become also your number one tool to integrate responsive images.