HTMLStyleElement: sheet property

Baseline Widely available

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

The read-only sheet property of the HTMLStyleElement interface contains the stylesheet associated with that element.

An StyleSheet is always associated with a HTMLStyleElement, unless its type attribute is not text/css.

Value

A StyleSheet object, or null if none is associated with the element.

Suppose the <head> contains the following:

<style id="inline-style">
  p {
    color: blue;
  }
</style>

The sheet property of the associated HTMLStyleElement object will return the StyleSheet object describing it.

const style = document.getElementById("inline-style");
console.log(style.sheet.cssRules[0].cssText); // 'p { color: blue; }'

Specification
CSS Object Model (CSSOM) # dom-linkstyle-sheet