Simple loading spinners animated with CSS. See demo.
SpinKit uses CSS animations to create smooth and easily customizable animations. The goal is not to offer a solution that works in every browser. If you're building a site with users running IE9 and below, you'll want to detect support for the CSS animation attribute, and implement a fallback animation (e.g. a GIF.)
If you're submitting a new animation, make sure that it looks identical in all browsers that support CSS animations.