@keyframes
Quick Summary for @keyframes
@keyframes
CSS at-rule controls the intermediate steps in a CSS animation sequence by defining styles for keyframes (or waypoints) along the animation sequence. This gives more control over the intermediate steps of the animation sequence than transitions.
Code Usage for @keyframes
@keyframes slidein { from { transform: translateX(0%); } to { transform: translateX(100%); } }
More Details for @keyframes
@keyframes
The @keyframes
CSS at-rule controls the intermediate steps in a CSS animation sequence by defining styles for keyframes (or waypoints) along the animation sequence. This gives more control over the intermediate steps of the animation sequence than transitions.
Syntax
@keyframes slidein { from { transform: translateX(0%); } to { transform: translateX(100%); } }
Values
<custom-ident>
A name identifying the keyframe list. This must match the identifier production in CSS syntax.
from
A starting offset of 0%
.
to
An ending offset of 100%
.
<percentage>
A percentage of the time through the animation sequence at which the specified keyframe should occur.
Description
JavaScript can access the @keyframes
at-rule with the CSS object model interface CSSKeyframesRule
.
To use keyframes, create a @keyframes
rule with a name that is then used by the animation-name
property to match an animation to its keyframe declaration. Each @keyframes
rule contains a style list of keyframe selectors, which specify percentages along the animation when the keyframe occurs, and a block containing the styles for that keyframe.
You can list the keyframe percentages in any order; they will be handled in the order they should occur.
Valid keyframe lists
If a keyframe rule doesn't specify the start or end states of the animation (that is, 0%
/from
and 100%
/to
), browsers will use the element's existing styles for the start/end states. This can be used to animate an element from its initial state and back.
Properties that can't be animated in keyframe rules are ignored, but supported properties will still be animated.
Resolving duplicates
If multiple keyframe sets exist for a given name, the last one encountered by the parser is used. @keyframes
rules don't cascade, so animations never derive keyframes from more than one rule set.
If a given animation time offset is duplicated, all keyframes in the @keyframes
rule for that percentage are used for that frame. There is cascading within a @keyframes
rule if multiple keyframes specify the same percentage values.
When properties are left out of some keyframes
Properties that aren't specified in every keyframe are interpolated if possible — properties that can't be interpolated are dropped from the animation. For example:
@keyframes identifier { 0% { top: 0; left: 0; } 30% { top: 50px; } 68%, 72% { left: 50px; } 100% { top: 100px; left: 100%; } }
Here, the top
property animates using the 0%
, 30%
, and 100%
keyframes, and left
animates using the 0%
, 68%
, 72%
and 100%
keyframes.
When a keyframe is defined multiple times
If a keyframe is defined multiple times but not all affected properties are in each keyframe, all values specified in these keyframes are considered. For example:
@keyframes identifier { 0% { top: 0; } 50% { top: 30px; left: 20px; } 50% { top: 10px; } 100% { top: 0; } }
In this example, at the 50%
keyframe, the values used are top: 10px
and left: 20px
.
Cascading keyframes are supported starting in Firefox 14.
!important
in a keyframe
Declarations in a keyframe qualified with !important
are ignored.
@keyframes important1 { from { margin-top: 50px; } 50% { margin-top: 150px !important; } /* ignored */ to { margin-top: 100px; } } @keyframes important2 { from { margin-top: 50px; margin-bottom: 100px; } to { margin-top: 150px !important; /* ignored */ margin-bottom: 50px; } }
Formal syntax
@keyframes <keyframes-name> { <keyframe-block-list> }where
<keyframes-name> = <custom-ident> | <string><keyframe-block-list> = <keyframe-block>+
where
<keyframe-block> = <keyframe-selector># { <declaration-list> }
where
<keyframe-selector> = from | to | <percentage>
Examples
CSS animation examples
See Using CSS animations for examples.
Specifications
Specification |
---|
CSS Animations Level 2 # keyframes |
See also
Using CSS animationsAnimationEvent
Last modified: Aug 12, 2021, by MDN contributors
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