https://larsmo.fi/wp-content/themes/kantapohja/dist/scripts/menu-accessibility.js?ver=1790946165

1(function($){
2    $(function(){
3        $('.dropdown .arrow').each(function(){
4            if ($(this).next().hasClass('sub-menu') == false) {
5                $(this).remove();
6            }
7        });
8    });
9    $(document).on('keydown', function(event){
10        var el = $(':focus');
11        // console.log(el.text());
12        var larr = 37,
13            uarr = 38,
14            rarr = 39,
15            darr = 40;
16        switch (event.keyCode) {
17            case larr:
18                arrow_left(el);
19                break;
20            case uarr:
21                arrow_up(el);
22                break;
23            case rarr:
24                arrow_right(el);
25                break;
26            case darr:
27                arrow_down(el);
28                break;
29            default:
30                console.log('you pressed key nr', event.keyCode);
31        }
32    });
33    function arrow_up(el) {
34        if (el.parent().hasClass('dropdown')) {
35            el.parent().removeClass('open');
36        }
37        else if (el.parent().is('li:first-child') && el.parent().parentsUntil('.menu-item-has-children').hasClass('dropdown')){
38            console.log('parent is first');
39            el.closest('.dropdown').removeClass('open').find('> a').focus();
40        } 
41        else {
42            el.parent().prev('.menu-item').find('a:first').focus();
43        }
44    }
45    function arrow_left(el) {
46        console.log(el.parent());
47        if (el.closest('.sub-menu').length > 0) {
48            el.closest('.sub-menu').removeClass('active').parent().find('a:first').focus();
49        }
50        else if (el.parent().is(':first-child')) {
51            el.parent().parent().find('> a').focus();
52        }
53        else {
54            el.parent().find('a:first').focus();
55        }
56    }
57    function arrow_right(el) {
58        if (el.parent().has('.menu-item')) {
59            el.siblings('.sub-menu').first().addClass('active').find('li:first-child > a').focus();
60        }
61        else {
62            el.next('.menu-item').find('a:first').focus();
63        }
64    }
65    function arrow_down(el) {
66        if (el.parent().hasClass('dropdown')) {
67            el.parent().addClass('open').find('.sub-menu li:first-child > a').focus();
68            el.parent().siblings().removeClass('open');
69        }
70        else {
71            el.parent().next('.menu-item').find('a:first').focus();
72        }
73    }
74})(jQuery);