CSSStyleSheet: cssRules property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2015.

The read-only CSSStyleSheet property cssRules returns a live CSSRuleList which provides a real-time, up-to-date list of every CSS rule which comprises the stylesheet. Each item in the list is a CSSRule defining a single rule.

Value

A live-updating CSSRuleList containing each of the CSS rules making up the stylesheet. Each entry in the rule list is a CSSRule object describing one rule making up the stylesheet.

Examples

Individual rules within the stylesheet can then be accessed by index:

js
const ruleList = document.styleSheets[0].cssRules;

for (let i = 0; i < ruleList.length; i++) {
  processRule(ruleList[i]);
}

Rules can also be accessed using for...of:

js
const ruleList = document.styleSheets[0].cssRules;

for (const rule of ruleList) {
  processRule(rule);
}

However, because CSSRule is not a proper array, you can't use forEach().

Specifications

Specification
CSS Object Model (CSSOM)
# dom-cssstylesheet-cssrules

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
cssRules

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support

See also