Optimizing isXMLDoc.

diff --git a/src/core.js b/src/core.js
index 460a1da..b105c4c 100644 (file)
--- a/src/core.js
+++ b/src/core.js
@@ -311,8 +311,7 @@ jQuery.extend({
 
        // check if an element is in a (or is an) XML document
        isXMLDoc: function( elem ) {
-               return elem.nodeType === 9 && elem.documentElement.nodeName !== "HTML" ||
-                       !!elem.ownerDocument && elem.ownerDocument.documentElement.nodeName !== "HTML";
+               return (elem.ownerDocument || elem).documentElement.nodeName !== "HTML";
        },
 
        // Evalulates a script in a global context