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animation-timing-function

The animation-timing-function CSS property sets how an animation progresses through the duration of each cycle.

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

Syntax

/* Keyword values */
animation-timing-function: ease;
animation-timing-function: ease-in;
animation-timing-function: ease-out;
animation-timing-function: ease-in-out;
animation-timing-function: linear;
animation-timing-function: step-start;
animation-timing-function: step-end;

/* Function values */
animation-timing-function: cubic-bezier(0.1, 0.7, 1.0, 0.1);
animation-timing-function: steps(4, end);

/* Steps Function keywords */ 
animation-timing-function: steps(4, jump-start);
animation-timing-function: steps(10, jump-end);
animation-timing-function: steps(20, jump-none);
animation-timing-function: steps(5, jump-both);
animation-timing-function: steps(6, start);
animation-timing-function: steps(8, end);

/* Multiple animations */
animation-timing-function: ease, step-start, cubic-bezier(0.1, 0.7, 1.0, 0.1);

/* Global values */
animation-timing-function: inherit;
animation-timing-function: initial;
animation-timing-function: unset;

Timing functions may be specified on individual keyframes in a @keyframes rule. If no animation-timing-function is specified on a keyframe, the corresponding value of animation-timing-function from the element to which the animation is applied is used for that keyframe.

A keyframe's timing function is applied on a property-by-property basis from the keyframe on which it is specified until the next keyframe specifying that property, or until the end of the animation if there is no subsequent keyframe specifying that property. As a result, an animation-timing-function specified on the 100% or to keyframe will never be used.

Values

<timing-function>

The timing function that corresponds to a given animation, as determined by animation-name.

The non-step keyword values (ease, linear, ease-in-out, etc.) each represent cubic Bézier curve with fixed four point values, with the cubic-bezier() function value allowing for a non-predefined value. The step timing functions divides the input time into a specified number of intervals that are equal in length. It is defined by a number of steps and a step position.

ease
Equal to cubic-bezier(0.25, 0.1, 0.25, 1.0), the default value, increases in velocity towards the middle of the animation, slowing back down at the end.
linear
Equal to cubic-bezier(0.0, 0.0, 1.0, 1.0), animates at an even speed.
ease-in
Equal to cubic-bezier(0.42, 0, 1.0, 1.0), starts off slowly, with the speed of the transition of the animating properting increasing until complete.
ease-out
Equal to cubic-bezier(0, 0, 0.58, 1.0), starts quickly, slowing down the animation continues. •
ease-in-out
Equal to cubic-bezier(0.42, 0, 0.58, 1.0), with the animating properties slowly transitioning, speeding up, and then slowing down again.
cubic-bezier(p1, p2, p3, p4)
An author defined cubic-bezier curve, where the p1 and p3 values must be in the range of 0 to 1.
steps(n, <jumpterm>)
Displays an animation iteration along n stops along the transition, displaying each stop for equal lengths of time. For example, if n is 5, there are 5 steps. Whether the animation holds temporarily at 0%, 20%, 40%, 60% and 80%, on the 20%, 40%, 60%, 80% and 100%, or makes 5 stops between the 0% and 100% along the animation, or makes 5 stops including the 0% and 100% marks (on the 0%, 25%, 50%, 75%, and 100%) depends on which of the following jump terms is used:
jump-start
Denotes a left-continuous function, so that the first jump happens when the animation begins;
jump-end
Denotes a right-continuous function, so that the last jump happens when the animation ends;
jump-none
There is no jump on either end. Instead, holding at both the 0% mark and the 100% mark, each for 1/n of the duration.
jump-both
Includes pauses at both the 0% and 100% marks, effectively adding a step during the animation iteration.
start
Same as jump-start.
end
Same as jump-end.
step-start
Equal to steps(1, jump-start)
step-end
Equal to steps(1, jump-end)

Note: When you specify multiple comma-separated values on an animation-* property, they will be assigned to the animations specified in the animation-name property in different ways depending on how many there are. For more information, see Setting multiple animation property values.

Formal definition

Initial value ease
Applies to all elements, ::before and ::after pseudo-elements
Inherited no
Computed value as specified
Animation type discrete

Formal syntax

<timing-function>#

where
<timing-function> = linear | <cubic-bezier-timing-function> | <step-timing-function>

where
<cubic-bezier-timing-function> = ease | ease-in | ease-out | ease-in-out | cubic-bezier(<number <a href="/en-US/docs/CSS/Value_definition_syntax#Brackets" title="Brackets: enclose several entities, combinators, and multipliers to transform them as a single component">[0,1]>, <number>, <number <a href="/en-US/docs/CSS/Value_definition_syntax#Brackets" title="Brackets: enclose several entities, combinators, and multipliers to transform them as a single component">[0,1]>, <number>)
<step-timing-function> = step-start | step-end | steps(<integer>[, <step-position>]?)

where
<step-position> = jump-start | jump-end | jump-none | jump-both | start | end

Examples

Cubic-Bezier examples

.ease {
   animation-timing-function: ease;
}
.easein {
   animation-timing-function: ease-in;
}
.easeout {
   animation-timing-function: ease-out;
}
.easeinout {
   animation-timing-function: ease-in-out;
}
.linear {
   animation-timing-function: linear;
}
.cb {
   animation-timing-function: cubic-bezier(0.2,-2,0.8,2);
}

Step examples

.jump-start {
   animation-timing-function: steps(5, jump-start);
}
.jump-end {
   animation-timing-function: steps(5, jump-end);
}
.jump-none {
   animation-timing-function: steps(5, jump-none);
}
.jump-both {
   animation-timing-function: steps(5, jump-both);
}
.start { 
   animation-timing-function: steps(5, start); 
} 
.end { 
   animation-timing-function: steps(5, end); 
}
.step-start {
   animation-timing-function: step-start;
}
.step-end {
   animation-timing-function: step-end;
}

Specifications

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

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
animation-timing-function 43
43
3
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
12
12
12
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
16
16
49
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
44
Prefixed Disabled
Prefixed Implemented with the vendor prefix: -webkit-
Disabled From version 44: this feature is behind the layout.css.prefixes.webkit preference (needs to be set to true). To change preferences in Firefox, visit about:config.
5
Prefixed
Prefixed Implemented with the vendor prefix: -moz-
10 30
30
15
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
12.1 — 15
12 — 15
Prefixed
Prefixed Implemented with the vendor prefix: -o-
9
9
4
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
jump- keywords for steps() 77 79 65 No 64 14
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
animation-timing-function 43
43
≤37
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
43
43
18
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
16
16
49
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
44
Prefixed Disabled
Prefixed Implemented with the vendor prefix: -webkit-
Disabled From version 44: this feature is behind the layout.css.prefixes.webkit preference (needs to be set to true). To change preferences in Firefox, visit about:config.
5
Prefixed
Prefixed Implemented with the vendor prefix: -moz-
30
30
14
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
12.1 — 14
12 — 14
Prefixed
Prefixed Implemented with the vendor prefix: -o-
9
9
3.2
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
4.0
4.0
1.0
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
jump- keywords for steps() 77 77 65 55 14 12.0

See also

© 2005–2020 Mozilla and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/CSS/animation-timing-function