js/90-mobilenav.js

   1 $(function(){
   2         const nav = $('nav')[0];
   3         nav.classList.add('hidden-xs');
   4         $('#title')[0].insertAdjacentHTML('beforebegin', '<div class="text-center visible-xs-block">Tap title to toggle menu</div>');
   5         $('#title').on('click', () => nav.classList.toggle('hidden-xs'));
   6 });