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CSS animation-timing-function Property

The animation-timing-function property specifies how a CSS animation should progress over the duration of each cycle.

CSS Demo: animation-timing-function

animation-timing-function: linear;
animation-timing-function: ease-in;
animation-timing-function: ease-out;
animation-timing-function: ease-in-out;
animation-timing-function: step-start;

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

Technical Details

Default value ease
Applies to all elements
Inherited no
Computed value as specified
Animatable no See animatable properties.
Version CSS3
JavaScript syntax object.style.animationTimingFunction = "ease-in"


CSS Syntax:

animation-timing-function: linear|ease|ease-in|ease-out|ease-in-out|step-start|step-end|steps(int,start|end)|cubic-bezier(n,n,n,n)|initial|inherit;

Examples

ease-in timing function:

Run code

ease-out timing function:

Run code

Custom timing function using (cubic-bezier):

Run code

Browser compatibility

The numbers in the table specify the first browser version that fully supports the animation-timing-function property:

Property
animation-timing-function 43
-webkit-
16
-moz-
30
-webkit-
9
-webkit-
12

Property Values

The following table describes the values of animation-timing-function property:

Value Description
linear The animation has the same speed from start to end
ease The animation has a slow start, then fast, before it ends slowly (This is default)
ease-in The animation has a slow start
ease-out The animation has a slow end
ease-in-out The animation has both a slow start and a slow end
step-start Equivalent to steps(1, start)
step-end Equivalent to steps(1, end)
steps(n,start|end) Specifies a stepping function, with two parameters. The first parameter specifies the number of intervals in the function. It must be a positive integer (greater than 0). The second parameter, which is optional, is either the value "start" or "end"
cubic-bezier(n,n,n,n) Lets you define your own values in a cubic-bezier function. It is also known as speed curve. Possible values are numeric values from 0 to 1.
initial Sets this property to its default value
inherit Inherits this property from its parent element

See also

CSS Animation tutorial

CSS @keyframes property