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/DOM

StyleSheet.ownerNode

ownerNode returns the node that associates this style sheet with the document.

Syntax

objRef = stylesheet.ownerNode 

Example

<html>
 <head>
  <link rel="StyleSheet" href="example.css" type="text/css" />
  <script>
   function stilo() {
    alert(document.styleSheets[0].ownerNode);
   }
  </script> 
 </head>
 <body>
   <button onclick="stilo()">ss</button>
 </body>
</html>
// displays "object HTMLLinkElement"

Notes

For HTML, ownerNode may be the corresponding LINK or STYLE element. For XML, it may be the linking processing instruction. For style sheets that are included by other style sheets, the value of this attribute is NULL.

Specification

DOM Level 2 Styles - STYLESHEET

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/StyleSheet/ownerNode