The CSSStyleDeclaration.parentRule read-only property returns a CSSRule that is the parent of this style block, e.g. a CSSStyleRule representing the style for a CSS selector.
var rule = styles.parentRule;
The CSS rule that contains this declaration block or null if this CSSStyleDeclaration is not attached to a CSSRule.
The following JavaScript code gets the parent CSS style rule from a CSSStyleDeclaration:
var declaration = document.styleSheets[0].rules[0].style; var rule = declaration.parentRule;
| Desktop | ||||||
|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | |
| Basic support | Yes | Yes | Yes | Yes | Yes | Yes |
| Mobile | |||||||
|---|---|---|---|---|---|---|---|
| Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
| Basic support | Yes | Yes | Yes | Yes | Yes | Yes | ? |
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https://developer.mozilla.org/en-US/docs/Web/API/CSSStyleDeclaration/parentRule