The ownerNode property of the StyleSheet interface returns the node that associates this style sheet with the document.
This is usually an HTML <link> or <style> element, but can also return a processing instruction node in the case of <?xml-stylesheet ?>.
A Node object.
Assuming the <head> contains the following:
<link rel="stylesheet" href="example.css" />Then:
console.log(document.styleSheets[0].ownerNode);
// Displays '<link rel="stylesheet" href="example.css">'For style sheets that are included by other style sheets, such as with @import, the value of this property is null.