1 files changed, 50 insertions, 2 deletions
diff --git a/src/core.js b/src/core.js
index f1ef9ef97..fdc32dde8 100644
--- a/src/core.js
+++ b/src/core.js
@@ -25,8 +25,9 @@ define( [
 
 "use strict";
 
-var
-	version = "@VERSION",
+var version = "@VERSION",
+
+	rhtmlSuffix = /HTML$/i,
 
 	// Define a local copy of jQuery
 	jQuery = function( selector, context ) {
@@ -259,6 +260,44 @@ jQuery.extend( {
 		return obj;
 	},
 
+
+	// Retrieve the text value of an array of DOM nodes
+	text: function( elem ) {
+		var node,
+			ret = "",
+			i = 0,
+			nodeType = elem.nodeType;
+
+		if ( !nodeType ) {
+
+			// If no nodeType, this is expected to be an array
+			while ( ( node = elem[ i++ ] ) ) {
+
+				// Do not traverse comment nodes
+				ret += jQuery.text( node );
+			}
+		} else if ( nodeType === 1 || nodeType === 9 || nodeType === 11 ) {
+
+			// Use textContent for elements
+			// innerText usage removed for consistency of new lines (jQuery #11153)
+			if ( typeof elem.textContent === "string" ) {
+				return elem.textContent;
+			} else {
+
+				// Traverse its children
+				for ( elem = elem.firstChild; elem; elem = elem.nextSibling ) {
+					ret += jQuery.text( elem );
+				}
+			}
+		} else if ( nodeType === 3 || nodeType === 4 ) {
+			return elem.nodeValue;
+		}
+
+		// Do not include comment or processing instruction nodes
+
+		return ret;
+	},
+
 	trim: function( text ) {
 		return text == null ? "" : trim.call( text );
 	},
@@ -285,6 +324,15 @@ jQuery.extend( {
 		return arr == null ? -1 : indexOf.call( arr, elem, i );
 	},
 
+	isXMLDoc: function( elem ) {
+		var namespace = elem.namespaceURI,
+			docElem = ( elem.ownerDocument || elem ).documentElement;
+
+		// Assume HTML when documentElement doesn't yet exist, such as inside
+		// document fragments.
+		return !rhtmlSuffix.test( namespace || docElem && docElem.nodeName || "HTML" );
+	},
+
 	merge: function( first, second ) {
 		var len = +second.length,
 			j = 0,