CSSKeyframesRule: appendRule() method
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 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 slide-in {
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 |
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| CSS Animations Level 1 # interface-csskeyframesrule-appendrule |
Browser compatibility
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appendRule
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Legend
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- Full support
- Full support
- Uses a non-standard name
- Has more compatibility info.