Baseline Widely available
The parentRule property of the CSSRule interface returns the containing rule of the current rule if this exists, or otherwise returns null.
A CSSRule which is the type of the containing rules. If the current rule is inside a media query, this would return CSSMediaRule. Otherwise it returns null.
@media (width >= 500px) {
.box {
width: 100px;
height: 200px;
background-color: red;
}
body {
color: blue;
}
}
let myRules = document.styleSheets[0].cssRules;
let childRules = myRules[0].cssRules;
console.log(childRules[0].parentRule); // a CSSMediaRule
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