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
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