spin.js - imageless activity indicator
Spin.js is an imageless activity / loading indicator.
The library gives you fine control over your indicator's look and at 3K minified (1.7K gzipped) it is smaller than most similar animated GIFs.
Spin.js is completely stand-alone and works with Chrome, Safari 4+, Firefox 3.5+, IE 6,7,8,9+, Opera 10.6+ and Mobile Safari (iOS 4) and is distributed under the MIT license.
