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diff --git a/js/mathjax/extensions/TeX/noUndefined.js b/js/mathjax/extensions/TeX/noUndefined.js
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+// @license magnet:?xt=urn:btih:8e4f440f4c65981c5bf93c76d35135ba5064d8b7dn=apache-2.0.txt Apache-2.0
+/* -*- Mode: Javascript; indent-tabs-mode:nil; js-indent-level: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+
+/*************************************************************
+ *
+ *  MathJax/extensions/TeX/noUndefined.js
+ *  
+ *  This causes undefined control sequences to be shown as their macro
+ *  names rather than producing an error message.  So $X_{\xxx}$ would
+ *  display as an X with a subscript consiting of the text "\xxx".
+ *  
+ *  To configure this extension, use for example
+ *  
+ *      MathJax.Hub.Config({
+ *        TeX: {
+ *          noUndefined: {
+ *            attributes: {
+ *              mathcolor: "red",
+ *              mathbackground: "#FFEEEE",
+ *              mathsize: "90%"
+ *            }
+ *          }
+ *        }
+ *      });
+ *
+ *  ---------------------------------------------------------------------
+ *  
+ *  Copyright (c) 2010-2020 The MathJax Consortium
+ * 
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+//
+//  The configuration defaults, augmented by the user settings
+//
+MathJax.Extension["TeX/noUndefined"] = {
+  version: "2.7.9",
+  config: MathJax.Hub.CombineConfig("TeX.noUndefined",{
+    disabled: false,      // set to true to return to original error messages
+    attributes: {
+      mathcolor: "red"
+    }
+  })
+};
+
+MathJax.Hub.Register.StartupHook("TeX Jax Ready",function () {
+  var CONFIG = MathJax.Extension["TeX/noUndefined"].config;
+  var MML = MathJax.ElementJax.mml;
+  var UNDEFINED = MathJax.InputJax.TeX.Parse.prototype.csUndefined;
+
+  MathJax.InputJax.TeX.Parse.Augment({
+    csUndefined: function (name) {
+      if (CONFIG.disabled) {return UNDEFINED.apply(this,arguments)}
+      MathJax.Hub.signal.Post(["TeX Jax - undefined control sequence",name]);
+      this.Push(MML.mtext(name).With(CONFIG.attributes));
+    }
+  });
+
+  MathJax.Hub.Startup.signal.Post("TeX noUndefined Ready");
+});
+
+MathJax.Ajax.loadComplete("[MathJax]/extensions/TeX/noUndefined.js");
+// @license-end