first commit

media/templates/site/cassiopeia/js/mod_menu/menu-metismenu.js

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+/**
+ * @package     Joomla.Site
+ * @subpackage  Templates.cassiopeia
+ * @copyright   (C) 2020 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ * @since       4.0.0
+ */
+
+document.addEventListener('DOMContentLoaded', () => {
+  const allMenus = document.querySelectorAll('ul.mod-menu_dropdown-metismenu');
+  allMenus.forEach(menu => {
+    // eslint-disable-next-line no-new, no-undef
+    const mm = new MetisMenu(menu, {
+      triggerElement: 'button.mm-toggler'
+    }).on('shown.metisMenu', event => {
+      window.addEventListener('click', function mmClick(e) {
+        if (!event.target.contains(e.target)) {
+          mm.hide(event.detail.shownElement);
+          window.removeEventListener('click', mmClick);
+        }
+      });
+    });
+  });
+});

media/templates/site/cassiopeia/js/mod_menu/menu-metismenu.min.js

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+document.addEventListener("DOMContentLoaded",(()=>{document.querySelectorAll("ul.mod-menu_dropdown-metismenu").forEach((e=>{const n=new MetisMenu(e,{triggerElement:"button.mm-toggler"}).on("shown.metisMenu",(e=>{window.addEventListener("click",(function t(o){e.target.contains(o.target)||(n.hide(e.detail.shownElement),window.removeEventListener("click",t))}))}))}))}));

media/templates/site/cassiopeia/js/template.js

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+/**
+ * @package     Joomla.Site
+ * @subpackage  Templates.Cassiopeia
+ * @copyright   (C) 2017 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ * @since       4.0.0
+ */
+
+Joomla = window.Joomla || {};
+
+(function(Joomla, document) {
+  'use strict';
+
+  function initTemplate(event) {
+    var target = event && event.target ? event.target : document;
+
+    /**
+     * Prevent clicks on buttons within a disabled fieldset
+     */
+    var fieldsets = target.querySelectorAll('fieldset.btn-group');
+    for (var i = 0; i < fieldsets.length; i++) {
+      var self = fieldsets[i];
+      if (self.getAttribute('disabled') ===  true) {
+        self.style.pointerEvents = 'none';
+        var btns = self.querySelectorAll('.btn');
+        for (var ib = 0; ib < btns.length; ib++) {
+          btns[ib].classList.add('disabled');
+        }
+      }
+    }
+  }
+
+  document.addEventListener('DOMContentLoaded', function (event) {
+    initTemplate(event);
+
+    /**
+     * Back to top
+     */
+    var backToTop = document.getElementById('back-top');
+
+    if (backToTop) {
+
+      function checkScrollPos() {
+        if (document.body.scrollTop > 20 || document.documentElement.scrollTop > 20) {
+          backToTop.classList.add('visible');
+        } else {
+          backToTop.classList.remove('visible')
+        }
+      }
+
+      checkScrollPos();
+
+      window.onscroll = function() {
+        checkScrollPos();
+      };
+
+      backToTop.addEventListener('click', function(event) {
+        event.preventDefault();
+        window.scrollTo(0, 0);
+      });
+    }
+
+    [].slice.call(document.head.querySelectorAll('link[rel="lazy-stylesheet"]'))
+      .forEach(function($link){
+        $link.rel = "stylesheet";
+      });
+  });
+
+  /**
+   * Initialize when a part of the page was updated
+   */
+  document.addEventListener('joomla:updated', initTemplate);
+
+})(Joomla, document);

media/templates/site/cassiopeia/js/template.min.js

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+Joomla=window.Joomla||{},function(e,t){"use strict";function l(e){for(var l=(e&&e.target?e.target:t).querySelectorAll("fieldset.btn-group"),o=0;o<l.length;o++){var n=l[o];if(!0===n.getAttribute("disabled")){n.style.pointerEvents="none";for(var i=n.querySelectorAll(".btn"),r=0;r<i.length;r++)i[r].classList.add("disabled")}}}t.addEventListener("DOMContentLoaded",(function(e){l(e);var o=t.getElementById("back-top");if(o){function n(){t.body.scrollTop>20||t.documentElement.scrollTop>20?o.classList.add("visible"):o.classList.remove("visible")}n(),window.onscroll=function(){n()},o.addEventListener("click",(function(e){e.preventDefault(),window.scrollTo(0,0)}))}[].slice.call(t.head.querySelectorAll('link[rel="lazy-stylesheet"]')).forEach((function(e){e.rel="stylesheet"}))})),t.addEventListener("joomla:updated",l)}(Joomla,document);