https://adelekeuniversity.edu.ng/wp-content/themes/elearning-education/assets/js/focus-nav.js?ver=1

1( function( window, document ) {
2  function elearning_education_keepFocusInMenu() {
3    document.addEventListener( 'keydown', function( e ) {
4      const elearning_education_nav = document.querySelector( '.sidenav' );
5      if ( ! elearning_education_nav || ! elearning_education_nav.classList.contains( 'open' ) ) {
6        return;
7      }
8      const elements = [...elearning_education_nav.querySelectorAll( 'input, a, button' )],
9        elearning_education_lastEl = elements[ elements.length - 1 ],
10        elearning_education_firstEl = elements[0],
11        elearning_education_activeEl = document.activeElement,
12        tabKey = e.keyCode === 9,
13        shiftKey = e.shiftKey;
14      if ( ! shiftKey && tabKey && elearning_education_lastEl === elearning_education_activeEl ) {
15        e.preventDefault();
16        elearning_education_firstEl.focus();
17      }
18      if ( shiftKey && tabKey && elearning_education_firstEl === elearning_education_activeEl ) {
19        e.preventDefault();
20        elearning_education_lastEl.focus();
21      }
22    } );
23  }
24  elearning_education_keepFocusInMenu();
25} )( window, document );