css drowpdown navigation on touch enabled devices.

nav-touch.js

/* eslint-disable */
(function ($) {
  Drupal.behaviors.mainNavTouch = {
    attach: function (context) {
      if (Modernizr.touchevents) {
        $('#block-evolve-main-menu > ul.menu > li.expandable > a:not(.ohm-mobile-toggle)', context).on('click', function(event) {

          var element = $(this);

          var firstTimeout = setTimeout(function() {
            element.attr({
              blocked: false
            })
          }, 500);

          var secondTimeout = setTimeout(function() {
            element.removeAttr('blocked');
          }, 3000);

          if(element.attr('blocked') !== 'false') {
            event.preventDefault();
          }
        });
      }
    }
  };
})(jQuery);