Basic Loading Screen For Material Design Lite – material-loading
The material-loading lets you create a fullscreen loading screen for official Material Design Lite framework.
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Lazy Load & Pre-cache Images To Improve Page Speed – Img2
Img2 is a web component that lazy-loads and pre-caches images to improve the page loading time.
Minimal Horizontal & Circular Progress Bar Library – ProgressBar.js
This is a tiny JavaScript library for creating circular and/or top horizontal progress bars animated with the tween.js library.
Fast High-Performance Lazy Load Library – LazyObserver.js
Just another JavaScript library which makes uses of the Intersection Observer API to provide the fast, performant and modern lazy loading functionality on your images within the document.
Minimalist Image Lazy Loader In Pure JavaScript
A super tiny (less than 1kb) image lazy loader library without any third dependencies.
Rotating Loading Spinner In JavaScript – ZlataLoader.js
ZlataLoader.js is a minimal JavaScript library to create animated loaders that rotate a loading spinner of your choice along a circle.
Mobile-first Dialog Popup JavaScript Library – mcx-dialog-mobile
mcx-dialog-mobile is a pure JavaScript plugin to create mobile-first, iOS-inspired dialog popups (alert/confirm dialog, action sheet, loading spinner, toast notification) on your web app.
Facebook-like Context Loader In Pure JavaScript – contextLoader
Yet another JavaScript library which applies a Facebook-inspired animated context loader/placeholder to any container element you specify.
Performant Image Lazy Load With Custom Events – justlazy.js
justlazy.js is a standalone and high-performance JavaScript plugin to lazy load images with support for custom trigger events such as click, inView, etc.
Custom Scroll Progress Indicator Bar – uScroll
uScroll is a lightweight JavaScript plugin that tracks the scroll events and auto updates the indicator bar depending on the current scroll position.