Initial version

themes/zen/assets/js/mobile.js

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+/**
+ * @file
+ * A JavaScript file for the mobile menu.
+ */
+
+(function () {
+
+  'use strict';
+
+  const nav = document.querySelector('.mobile-nav');
+  const sheet = document.querySelector('.mobile-nav__sheet');
+  const toggle = document.querySelector('.mobile-nav__toggle');
+
+  function navopen() {
+    nav.classList.add('js-nav-open');
+    sheet.setAttribute('aria-hidden', 'false');
+    toggle.setAttribute('aria-expanded', 'true');
+  }
+
+  function navclose() {
+    nav.classList.remove('js-nav-open');
+    sheet.setAttribute('aria-hidden', 'true');
+    toggle.setAttribute('aria-expanded', 'false');
+  }
+
+  // Toggle the mobile nav sheet.
+  const toggles = document.querySelectorAll('.mobile-nav__cover, .mobile-nav__toggle');
+  toggles.forEach(function (toggle) {
+    toggle.addEventListener('click', function (e) {
+      e.preventDefault();
+      if (nav.classList.contains('js-nav-open')) {
+        navclose();
+      }
+      else {
+        navopen();
+      }
+    });
+  });
+
+  // Close the nav sheet after click (needed for anchor links).
+  const links = document.querySelectorAll('.mobile-nav__sheet a');
+  links.forEach(function (link) {
+    link.addEventListener('click', function (e) {
+      navclose();
+    });
+  });
+
+  // Move focus back to button efter user tab out of last link.
+  const lastlink = [].slice.call(links).pop();
+  lastlink.addEventListener('blur', () => toggle.focus());
+
+})();