Any Resources Preloader JavaScript Library – Loader.js
Loader.js is a pure JavaScript preloader that preloads web resources (text, JSON, images, audios, videos, etc) and triggers certain events while loading and after loaded.
Loading
Dynamic Content Loading Using Fetch API – pill.js
pill.js is an ultra-lightweight JavaScript library to make your webpage behavior like the native app by dynamically loading content into the current webpage using Fetch API.
Minimal SVG Loading Spinner In Pure JS – LoadingSpinner.js
A vanilla JavaScript plugin to show a basic, animated, SVG-based loading spinner on the screen when needed.
Pull To Refresh Library With Pure JavaScript – Pull.js
Pull.js is a tiny and zero-dependency JavaScript library that provides pull to refresh & pull to load functionality for your mobile webpages.
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.
9 Minimal CSS Loading Spinners
Yet another collection of 9 minimal loading spinners created using pure CSS/CSS3.
Image Preloader With Loaded Callback – ImagePreloader
A lightweight image preloader written in pure JS that will trigger a callback function when all the provided images are completely loaded.
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.
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.