https://www.susu.ru/sites/all/themes/boot2017/js/a11y.js?tkf8ie

1var Drupal = Drupal || {};
2
3(function($, Drupal){
4  Drupal.behaviors.a11y = {
5    attach: function(context) {
6      var html = $('html');
7
8      if ($.cookie('Drupal.boot2017.a11y') != undefined) {
9        const cookie_classes = $.cookie('Drupal.boot2017.a11y');
10        const classes = cookie_classes.split(/\s+/);
11        $.each(classes, function(index, item) {
12          $('#a11y #btn-' + item).addClass('active');
13          html.addClass('a11y-' + item);
14        });
15      }
16
17      $('#a11y button').each(function() {
18        $(this).click(function() {
19          const btn_parts = this.id.split('-', 3); // btn-key-value
20          const classes = html.attr('class').split(/\s+/);
21
22          if (btn_parts[1] == 'RESET') {
23            $.cookie('Drupal.boot2017.a11y', null, {path: '/'});
24            $('#a11y button').removeClass('active');
25            $.each(classes, function(index, item) {
26              if (item.substring(0, 5) == 'a11y-') {
27                html.removeClass(item);
28              }
29            });
30          }
31          else  {
32            $.each(classes, function(index, item) {
33              const class_parts = item.split('-', 3); // a11y-key-value
34              if (class_parts[0] == 'a11y' && btn_parts[1] == class_parts[1]) {
35                if (btn_parts[2] != class_parts[2]) {
36                  html.removeClass(item);
37                }
38              }
39              html.addClass('a11y-' + btn_parts[1] + '-' + btn_parts[2]);
40            });
41            $('#group-' + btn_parts[1] + ' button').removeClass('active');
42            $(this).addClass('active');
43
44            const new_classes = html.attr('class').split(/\s+/);
45            var storable_classes = [];
46            $.each(new_classes, function(index, item) {
47              var found;
48              if (found = item.match(/^a11y-(.+)$/)) {
49                storable_classes.push(found[1]);
50              }
51            });
52            $.cookie('Drupal.boot2017.a11y', storable_classes.join(' '), {expires: 90, path: '/'});
53          }
54        });
55      });
56    }
57  }
58})(jQuery, Drupal);