<https://www.exeideas.com/wp-content/uploads/2014/05/Pure-JavaScript-Responsive-And-Touch-Friendly-Drop-Down-Menu-Bar.jpg>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.exeideas.com/2014/05/responsive-and-touch-dropdown-menu.html>