The animation-direction CSS property indicates whether the animation should play in reverse on alternate cycles.

It is often convenient to use the shorthand property animation to set all animation properties at once.

[Webplatform](http://docs.webplatform.org/wiki/css/properties/animation-direction "Webplatform")
[Mozilla docs](https://developer.mozilla.org/en-US/docs/Web/CSS/animation-direction "Mozilla")
[Caniuse](http://caniuse.com/#feat=css-animation "Caniuse")