Added an optimization for the case where $("body") is used.

[jquery.git] / src / core.js

diff --git a/src/core.js b/src/core.js
index 890e9a2..5ccf158 100644 (file)
--- a/src/core.js
+++ b/src/core.js
@@ -48,6 +48,11 @@ jQuery.fn = jQuery.prototype = {
                        return this;
                }
 
+               // $("body"): Shortcut for quickly finding the body element
+               if ( selector === "body" && !context && document.body ) {
+                       selector = document.body;
+               }
+
                // Handle $(DOMElement)
                if ( selector.nodeType ) {
                        this.context = this[0] = selector;
@@ -316,7 +321,8 @@ jQuery.extend({
        isXMLDoc: function( elem ) {
                // documentElement is verified for cases where it doesn't yet exist
                // (such as loading iframes in IE - #4833)
-               return ((elem.ownerDocument || elem).documentElement || 0).nodeName !== "HTML";
+               var documentElement = (elem ? elem.ownerDocument || elem : 0).documentElement;
+               return documentElement ? documentElement.nodeName !== "HTML" : false;
        },
 
        // Evalulates a script in a global context