This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage 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 specification changes.


The animation-duration CSS property specifies the length of time that an animation should take to complete one cycle.

A value of 0s, which is the default value, indicates that no animation should occur.

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

Initial value0s
Applies toall elements, ::before and ::after pseudo-elements
Computed valueas specified
Canonical orderthe unique non-ambiguous order defined by the formal grammar


animation-duration: 6s;
animation-duration: 120ms;
animation-duration: 1s, 15s;
animation-duration: 10s, 30s, 230ms;


The duration that an animation should take to complete one cycle. This may be specified in either seconds (by specifying s as the unit) or milliseconds (by specifying ms as the unit). If you don't specify a unit, the declaration will be invalid.
Note: Negative values are invalid, causing the declaration to be ignored. Some early, prefixed, implementations may consider them as identical to 0s.

Formal syntax



See CSS animations for examples.


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

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 3.0-webkit
5.0 (5.0)-moz
16.0 (16.0)[1]
10 12-o
Feature Android Chrome Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile Chrome for Android
Basic support 2.0-webkit ? 5.0 (5.0)-moz
16.0 (16.0)[1]
No support No support 4.2-webkit 43.0

[1] In addition to the unprefixed support, Gecko 44.0 (Firefox 44.0 / Thunderbird 44.0 / SeaMonkey 2.41) added support for a -webkit prefixed version of the property for web compatibility reasons behind the preference layout.css.prefixes.webkit, defaulting to false. Since Gecko 49.0 (Firefox 49.0 / Thunderbird 49.0 / SeaMonkey 2.46) the preference defaults to true.

See also

Document Tags and Contributors

 Last updated by: Sebastianz,