CSS3 Flickr Loading Animation (Spinner)
Flickr's loading/spinning animation in CSS3 using bleeding edge CSS3
animation-direction properties like
alternate-reverse. Some info on the different values accepted by
normal- animation plays forward on each cycle and then resets to the beginning at the end. (defaul)
alternate- animation direction and timing functions are reversed after each cycle.
reverse- animation plays backwards every cycle, basically the opposite of
alternate-reverse- animation plays backwards on first play, then forwards and then continues to alternate.
Original code by Lea Verou.