Added an extra documentElement check to isXMLDoc for IE - and added a number of unit...

[jquery.git] / src / core.js

diff --git a/src/core.js b/src/core.js
index cb9b528..097ff42 100644 (file)
--- a/src/core.js
+++ b/src/core.js
@@ -313,7 +313,10 @@ jQuery.extend({
 
        // check if an element is in a (or is an) XML document
        isXMLDoc: function( elem ) {
-               return (elem.ownerDocument || elem).documentElement.nodeName !== "HTML";
+               // 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";
        },
 
        // Evalulates a script in a global context