https://ost-term.ru/wp-content/plugins/rb-blocks/blocks/howto-section/frontend.js

1(function () {
2    'use strict';
3    document.addEventListener('DOMContentLoaded', function () {
4        document.querySelectorAll('.rbhow-page').forEach(function (root) {
5            var pills = root.querySelectorAll('.rbhow__pill');
6            if (!pills.length) return;
7            pills.forEach(function (pill) {
8                pill.addEventListener('click', function () {
9                    var cat = pill.getAttribute('data-cat');
10                    pills.forEach(function (p) { p.classList.remove('rbhow__pill--active'); });
11                    pill.classList.add('rbhow__pill--active');
12                    root.querySelectorAll('.rbhow-page__item').forEach(function (item) {
13                        if (cat === '*' || item.classList.contains('rbhow-cat-' + cat)) {
14                            item.removeAttribute('data-hidden'); item.style.display = '';
15                        } else {
16                            item.setAttribute('data-hidden', ''); item.style.display = 'none';
17                        }
18                    });
19                });
20            });
21        });
22    });
23})();