init

user/plugins/admin/themes/grav/app/utils/offline.js

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+import $ from 'jquery';
+import isOnline from '../utils/offline';
+
+const offlineElement = $('#offline-status');
+
+$(window).on('offline', () => {
+    offlineElement.slideDown();
+});
+
+$(window).on('online', () => {
+    offlineElement.slideUp();
+});
+
+$(document).ready(() => {
+    if (!isOnline) {
+        offlineElement.slideDown();
+    }
+});
+
+// assume online if can't check
+export default typeof global.navigator.onLine !== 'undefined' ? global.navigator.onLine : true;