This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for the proper prefixes to use in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the spec changes.

Summary

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.

Syntax

animation-direction: normal;
animation-direction: reverse;
animation-direction: alternate;
animation-direction: alternate-reverse;
animation-direction: normal, reverse;
animation-direction: alternate, reverse, normal;

Values

normal
The animation should play forward each cycle. In other words, each time the animation cycles, the animation will reset to the beginning state and start over again. This is the default animation direction setting.
reverse
The animation should reverse direction each cycle. When playing in reverse, the animation steps are performed backward. In addition, timing functions are also reversed; for example, an ease-in animation is replaced with an ease-out animation when played in reverse. The count to determine if it is an even or an odd iteration starts at one.
alternate
The animation plays backward each cycle. Each time the animation cycles, the animation resets to the end state and start over again.
alternate-reverse
The animation plays backward on the first play-through, then forward on the next, then continues to alternate. The count to determinate if it is an even or an odd iteration starts at one.

Formal syntax

<single-animation-direction>#

where
<single-animation-direction> = normal | reverse | alternate | alternate-reverse

Examples

See CSS animations for examples.

Specifications

Specification Status Comment
CSS Animations
The definition of 'animation-direction' in that specification.
Working Draft  

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support (Yes)-webkit 5.0 (5.0)-moz
16.0 (16.0)
10 12-o
12.50
4.0-webkit
reverse 19 16.0 (16.0) 10 Not supported Not supported
alternate-reverse 19 16.0 (16.0) 10 Not supported Not supported
Unprefixed 43.0 ? ? ? ?
Feature Android Android Webview Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile Chrome for Android
Basic support ? ? 5.0 (5.0)-moz
16.0 (16.0)
? ? ? (Yes)-webkit
reverse Not supported ? 16.0 (16.0) ? ? Not supported (Yes)-webkit
alternate-reverse ? ? 16.0 (16.0) ? ? ? (Yes)-webkit
Unprefixed Not supported Not supported ? ? ? ? 43.0

See also