x = new RegExp(/^(?:http|https):\/\/localhost\:?[0-9]*\//);
    var mailtoRegex = new RegExp(/^mailto:/);
      var filterRegex = new RegExp('/' + window.location.host + '/');
    var isInternal = (href) => {
        return filterRegex.test(href) || localhostRegex.test(href) || mailtoRegex.test(href);
    }
    // Inspect non-navigation links and adorn them if external
 	var links = window.document.querySelectorAll('a[href]:not(.nav-link):not(.navbar-brand):not(.toc-action):not(.sidebar-link):not(.sidebar-i