Brought the logic for handling isXMLDoc over from Sizzle.

04977b8e · John Resig · 67999828 · 04977b8e
Commit 04977b8e authored Jan 19, 2009 by John Resig
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core.js src/core.js +2 -2

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--- a/src/core.js
+++ b/src/core.js
@@ -621,8 +621,8 @@ jQuery.extend({
 	// check if an element is in a (or is an) XML document
 	isXMLDoc: function( elem ) {
-		return elem.documentElement && !elem.body ||
+		return elem.nodeType === 9 && elem.documentElement.nodeName !== "HTML" ||
-			elem.tagName && elem.ownerDocument && !elem.ownerDocument.body;
+			!!elem.ownerDocument && jQuery.isXMLDoc( elem.ownerDocument );
 	},
 	// Evalulates a script in a global context