This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The parentStyleSheet property of the StyleSheet interface returns the style sheet, if any, that is including the given style sheet.
A StyleSheet object.
// Find the top level stylesheet const sheet = stylesheet.parentStyleSheet ?? stylesheet;
This property returns null if the current stylesheet is a top-level stylesheet or if stylesheet inclusion is not supported.
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | WebView on iOS | |
parentStyleSheet |
1 | 12 | 1 | ≤12.1 | 1 | 18 | 4 | ≤12.1 | 1 | 1.0 | 4.4 | 1 |
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https://developer.mozilla.org/en-US/docs/Web/API/StyleSheet/parentStyleSheet