...Animations perform well even on mobile devices. It provides a few built‑in shapes like Line, Circle and SemiCircle but you can also create custom shaped progress bars with any vector graphic editor. ProgressBar.js is lightweight, MIT licensed and supports all major browsers including IE9+. A simple code example of creating a Line shaped progress bar and animating it from 0% to 100%. ProgressBar.js uses shifty tweening library to animate path drawing. So in other words, animation is done with JavaScript using requestAnimationFrame. ...