CSSKeyframesRule: length property

{{APIRef("CSSOM") }}

The read-only length property of the {{domxref("CSSKeyframesRule")}} interface returns the number of {{domxref("CSSKeyframeRule")}} objects in its list. You can then access each keyframe rule by its index directly on the CSSKeyframeRule object.

Value

A non-negative integer. It should have the same value as the length of the {{domxref("CSSKeyframesRule.cssRules", "cssRules")}} property.

Examples

The CSS includes a keyframes at-rule. This will be the first {{domxref("CSSRule")}} returned by document.styleSheets[0].cssRules. myRules[0] returns a {{domxref("CSSKeyframesRule")}} object. The cssRules property returns a {{domxref("CSSRuleList")}} 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 CSSKeyframesRule
console.log(keyframes.length); // 2

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}