CSSKeyframeRule

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since August 2016.

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.

CSSRule CSSKeyframeRule

Instance properties

Inherits properties from its ancestor CSSRule.

CSSKeyframeRule.keyText

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

CSSKeyframeRule.style Read only

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

Instance methods

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 CSSKeyFrameRule objects for each keyframe.

css
@keyframes slide-in {
  from {
    transform: translateX(0%);
  }

  to {
    transform: translateX(100%);
  }
}

js
let myRules = document.styleSheets[0].cssRules;
let keyframes = myRules[0]; // a CSSKeyframesRule
console.log(keyframes[0]); // a CSSKeyframeRule representing an individual keyframe.