The read-onlylength property of theCSSKeyframeRule interface returns the number ofCSSKeyframeRule objects in its list. You can then access each keyframe rule by its index directly on theCSSKeyframeRule object.

Value

A non-negative integer. It should have the same value as thelength of thecssRules property.

Examples

The CSS includes a keyframes at-rule. This will be the firstCSSRule returned bydocument.styleSheets[0].cssRules.myRules[0] returns aCSSKeyframesRule object. ThecssRules property returns aCSSRuleList containing two rules.

@keyframes slide-in {  from {    transform: translateX(0%);  }  to {    transform: translateX(100%);  }}

const myRules = document.styleSheets[0].cssRules;const keyframes = myRules[0]; // a CSSKeyframesRuleconsole.log(keyframes.length); // 2

Specifications

Browser compatibility