diff --git a/node_modules/jquery/src/css/var/swap.js b/node_modules/jquery/src/css/var/swap.js
new file mode 100644
index 0000000..1a9556b
--- /dev/null
+++ b/node_modules/jquery/src/css/var/swap.js
@@ -0,0 +1,26 @@
+define( function() {
+
+"use strict";
+
+// A method for quickly swapping in/out CSS properties to get correct calculations.
+return function( elem, options, callback, args ) {
+	var ret, name,
+		old = {};
+
+	// Remember the old values, and insert the new ones
+	for ( name in options ) {
+		old[ name ] = elem.style[ name ];
+		elem.style[ name ] = options[ name ];
+	}
+
+	ret = callback.apply( elem, args || [] );
+
+	// Revert the old values
+	for ( name in options ) {
+		elem.style[ name ] = old[ name ];
+	}
+
+	return ret;
+};
+
+} );