On the login screen a warning will pop up if an unsupported/outdated browser is used

bower.json

@@ -31,6 +31,7 @@
     "davclient.js": "https://github.com/evert/davclient.js.git#0.0.1",
     "es6-promise": "https://github.com/jakearchibald/es6-promise.git#2.3.0",
     "base64": "0.3.0",
-    "clipboard": "1.5.12"
+    "clipboard": "1.5.12",
+    "browser-update": "^2.0.1"
   }
 }

core/js/browser-update.js

@@ -0,0 +1,23 @@
+/**
+ * Copyright (c) 2017
+ *  Thomas Müller <thomas.mueller@tmit.eu>
+ *
+ * This file is licensed under the Affero General Public License version 3 or later.
+ * See the COPYING-README file.
+ */
+
+$(document).ready(function() {
+
+	// You can Customize here
+	window.$buoop = {
+		vs: { i: 10, f: 45, o: 0, s: 8, c: 45 },
+		reminder: 0,                  // after how many hours should the message reappear
+		test: false,                    // true = always show the bar (for testing)
+		newwindow: true,                // open link in new window/tab
+		url: null,                      // the url to go to after clicking the notification
+		noclose:true                  // Do not show the "ignore" button to close the notification
+	};
+
+	var path = OC.filePath('core','vendor','browser-update/browser-update.js');
+	$.getScript(path);
+});

core/templates/login.php

@@ -4,7 +4,8 @@
 script('core', [
 	'visitortimezone',
 	'lostpassword',
-	'login'
+	'login',
+	'browser-update'
 ]);
 ?>