CSSKeyframesRule: appendRule() method
The appendRule() method of the CSSKeyframeRule interface appends a CSSKeyFrameRule to the end of the rules.
Syntax
js
appendRule(rule)
Parameters
rule-
A string containing a keyframe rule.
Return value
None (undefined).
Examples
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.
css
@keyframes slidein {
from {
transform: translateX(0%);
}
}
js
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
Specifications
| Specification |
|---|
| CSS Animations Level 1 # interface-csskeyframesrule-appendrule |
Browser compatibility
| desktop | mobile | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
appendRule | |||||||||||