jquery/src/css/swap.js

define([
	"../core"
], function( jQuery ) {

	// A method for quickly swapping in/out CSS properties to get correct calculations.
	jQuery.swap = 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;
	};

	return jQuery.swap;
});