load-css module in Dojo

load-css.js

define([
    'dojo/on',
    'dojo/_base/window',
    'dojo/dom-construct',
    'dojo/Deferred'
], function (
    on,
    win,
    domConstruct,
    Deferred
) {
    'use strict';
    
    function loadCss (url) {
        var deferred = new Deferred();
        
        var link = domConstruct.create('link', {
            rel: 'stylesheet',
            type: 'text/css',
            href: url
        }, win.body());
        
        on(link, 'load', function () {
            deferred.resolve();
        });
        
        return deferred.promise;
    }
    
    return loadCss;
})