Baseline Widely available
The appendRule() method of the CSSKeyframeRule interface appends a CSSKeyFrameRule to the end of the rules.
rule
A string containing a keyframe rule.
None (undefined).
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. Returning the cssRules property would return a CSSRuleList containing one rule.
After appending another rule with appendRule the cssRules property returns a CSSRuleList containing two rules.
@keyframes slide-in {
from {
transform: translateX(0%);
}
}
let myRules = document.styleSheets[0].cssRules;
let keyframes = myRules[0]; // a CSSKeyframesRule
keyframes.appendRule("to {transform: translateX(100%);}");
console.log(keyframes.cssRules); // a CSSRuleList object with two rules
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