first commit

media/com_installer/js/installer.js

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+/**
+ * @copyright   (C) 2018 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+(() => {
+
+  document.addEventListener('DOMContentLoaded', () => {
+    const loading = document.getElementById('loading');
+    const installer = document.getElementById('installer-install');
+    if (loading && installer) {
+      loading.style.position = 'absolute';
+      loading.style.top = 0;
+      loading.style.left = 0;
+      loading.style.width = '100%';
+      loading.style.height = '100%';
+      loading.classList.add('hidden');
+    }
+  });
+})();