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StyleSheetList - Web APIs | MDN

Baseline Widely available

The StyleSheetList interface represents a list of CSSStyleSheet objects. An instance of this object can be returned by Document.styleSheets.

It is an array-like object but can't be iterated over using Array methods. However it can be iterated over in a standard for loop over its indices, or converted to an Array.

Note: Typically list interfaces like StyleSheetList wrap around Array types, so you can use Array methods on them. This is not the case here for historical reasons. However, you can convert StyleSheetList to an Array in order to use those methods (see the example below).

StyleSheetList.length Read only

Returns the number of CSSStyleSheet objects in the collection.

StyleSheetList.item()

Returns the CSSStyleSheet object at the index passed in, or null if no item exists for that index.

for (const styleSheet of document.styleSheets) {
  console.log(styleSheet); // A CSSStyleSheet object
}

const allCSS = [...document.styleSheets]
  .map((styleSheet) => {
    try {
      return [...styleSheet.cssRules].map((rule) => rule.cssText).join("");
    } catch (e) {
      console.log(
        "Access to stylesheet %s is denied. Ignoring…",
        styleSheet.href,
      );
      return undefined;
    }
  })
  .filter(Boolean)
  .join("\n");

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