The CSSMediaRule interface represents a single CSS @media rule.

Inherits properties from its ancestors CSSConditionRule, CSSGroupingRule, and CSSRule.

CSSMediaRule.media Read only

Returns a MediaList representing the intended destination medium for style information.

No specific methods; inherits methods from its ancestors CSSConditionRule, CSSGroupingRule, and CSSRule.

The CSS below includes a media query with one style rule. As this rule lives in the last stylesheet added to the document, it will be the first CSSRule returned by the last stylesheet in the document (document.styleSheets[document.styleSheets.length-1].cssRules). myRules[0] returns a CSSMediaRule object, from which we can get the mediaText.

<p id="log"></p>

@media (min-width: 500px) {
  body {
    color: blue;
  }
}

const log = document.getElementById("log");
const myRules = document.styleSheets[document.styleSheets.length - 1].cssRules;
const mediaList = myRules[0]; // a CSSMediaRule representing the media query.
log.textContent += `${mediaList.media.mediaText}`;