Prefetch URL on Hover

prefetch-url.js

(function($) {
  // Which links should we prefetch?
  var $linkElements = $(".menu-item a");

  $linkElements.on("hover", function() {
      var link = $(this).attr("href"),
          prerenderLink = $("#prerenderLink");
      if (prerenderLink.length) {
          if (prerenderLink.attr("href") === link) return;
          prerenderLink.attr("href", link);
      } else {
          $('<link id="prerenderLink" rel="prefetch prerender" href="' + link + '" />').appendTo("body");
      }
  });
})(jQuery);