https://stock-vision.net/assets/js/header.js

1(function () {
2  fetch('header.html')
3    .then(function (res) { return res.text(); })
4    .then(function (html) {
5      document.getElementById('header-placeholder').innerHTML = html;
6      var hamburger = document.querySelector('.sv-hamburger');
7      var nav = document.querySelector('.sv-header-nav');
8      if (!hamburger || !nav) return;
9      hamburger.addEventListener('click', function () {
10        var isOpen = nav.classList.toggle('is-open');
11        hamburger.classList.toggle('is-open', isOpen);
12        hamburger.setAttribute('aria-expanded', String(isOpen));
13      });
14      nav.querySelectorAll('.sv-nav-link').forEach(function (link) {
15        link.addEventListener('click', function () {
16          nav.classList.remove('is-open');
17          hamburger.classList.remove('is-open');
18          hamburger.setAttribute('aria-expanded', 'false');
19        });
20      });
21    });
22}());