Liquid Progress Indicator With JavaScript And Canvas – fluid-meter.js
fluid-meter.js is a JavaScript library to create a circular progress indicator with a fluid/water-like effect using Canvas API.
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Customizable Splash Screen For Web App – js-splash
js-splash is a pure JavaScript splash screen library to display an introduction page while your web application is launching as you see on the mobile app.
Youtube-like Customizable Top Loader In JavaScript – pageload
pageload is a small and dependency-free loading indicator library to create a Youtube-like loading bar on the top of the webpage.
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.
Beautiful Loading Spinners & Progress Bars – Loading-Visualization
Loading-Visualization is a JavaScript/CSS library to visualizing loading status in animated, customizable loading spinners & progress bars.
Progressive Image Loading Inspired By Medium.com – Pure Media
Pure Media is a tiny JavaScript library that applies a Medium.com like progressive loading effect to images within the document.
Slim Progressbar Component With LitElement – monkey-bar
monkey-bar is an easy, slim progress bar web component built with LitElement.
Preload Specified Assets Using XHR2 – preload-it
The preload-it library preloads & prefetches assets (e.g. videos, audios, etc) using XMLHttpRequest to optimize the loading speed of your webpage.
16 Single Element Loading Spinners In Pure CSS – SpinBolt
SpinBolt is a collection of 16 minimal, clean, circular, animated loading spinners implemented in single element and CSS/CSS3.
Pure JavaScript Library For Lazy Loading Images & Videos – lazyload.js
lazyload.js is a stand-alone JavaScript library for lazy loading images and videos without any dependencies.