The CSSKeyframeRule interface describes an object representing a set of styles for a given keyframe. It corresponds to the contents of a single keyframe of a @keyframes at-rule.


Inherits properties from its ancestor CSSRule.


Represents the key of the keyframe, like '10%', '75%'. The from keyword maps to '0%' and the to keyword maps to '100%'.

CSSKeyframeRule.styleRead only

Returns a CSSStyleDeclaration of the CSS style associated with the keyframe.


No specific methods; inherits methods from its ancestor CSSRule.


The CSS includes a keyframes at-rule. This will be the first CSSRule returned by document.styleSheets[0].cssRules. myRules[0] returns a CSSKeyframesRule object, which will contain individual CSSKeyFrame objects for each keyframe.

@keyframes slidein {
  from {
    transform: translateX(0%);

  to {
    transform: translateX(100%);
let myRules = document.styleSheets[0].cssRules;
let keyframes = myRules[0]; // a CSSKeyframesRule
console.log(keyframes[0]); // a CSSKeyframeRule representing an individual keyframe.


CSS Animations Level 2 (CSS Animations 2)
# interface-csskeyframerule

Browser compatibility

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See also