CSS animation-direction Property

Description

The animation-direction property defines whether or not the animation should play in reverse on some or all cycles. When an animation is played in reverse the timing functions are also reversed. For example, when played in reverse an ease-in animation would appear to be an ease-out animation.

Initial value: normal
Applies to: All elements, :before and :after pseudo elements
Inherited: No
Computed value: As specified
Animatable: No
JavaScript syntax: object.style.animationDirection

Syntax

animation-direction: <single-animation-direction> [ ',' <single-animation-direction> ]*

Values

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

normalAll iterations of the animation are played as specified.
reverseAll iterations of the animation are played in the reverse direction from the way they were specified.
alternateThe animation cycle iterations that are odd counts are played in the normal direction, and the animation cycle iterations that are even counts are played in a reverse direction.
alternate-reverseThe animation cycle iterations that are odd counts are played in the reverse direction, and the animation cycle iterations that are even counts are played in a normal direction.

Example

HTML

<div class="box normal">normal</div> 

<div class="box alternate">alternate</div> 

<div class="box reverse">reverse</div> 

<div class="box alternate-reverse">alternate-reverse</div>

CSS

.box { 
   background: #fc0; 
   width: 100px; 
   padding: 20px 0; 
   text-align: center; 
   position: absolute; 
   animation: move 5s infinite; 
} 
.normal { 
   animation-direction: normal; 
   background-color: #e4efc7; 
} 
.alternate { 
   top: 100px; 
   animation-direction: alternate; 
   background-color: #fee7dc; 
} 
.reverse { 
   top: 200px; 
   animation-direction: reverse; 
   background-color: #c8eaf5; 
} 
.alternate-reverse { 
   top: 300px; 
   animation-direction: alternate-reverse; 
   background-color: #ffead0; 
} 
@keyframes move { 
   from { 
      left: 0; 
   } 
   to { 
      left: 100%; transform: translateX(-100px); 
   } 
}

Result