Shortened the isXMLDoc code, based upon recommendation from Andrea.

diff --git a/src/core.js b/src/core.js
index 097ff42..7e7a4e2 100644 (file)
--- a/src/core.js
+++ b/src/core.js
@@ -315,8 +315,7 @@ jQuery.extend({
        isXMLDoc: function( elem ) {
                // documentElement is verified for cases where it doesn't yet exist
                // (such as loading iframes in IE - #4833)
-               var documentElement = (elem.ownerDocument || elem).documentElement;
-               return !!documentElement && documentElement.nodeName !== "HTML";
+               return ((elem.ownerDocument || elem).documentElement || 0).nodeName !== "HTML";
        },
 
        // Evalulates a script in a global context