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diff --git a/js/mathjax/extensions/TeX/action.js b/js/mathjax/extensions/TeX/action.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/action.js
+ *  
+ *  Implements the \mathtip, \texttip, and \toggle macros, which give
+ *  access from TeX to the <maction> tag in the MathML that underlies
+ *  MathJax's internal format.
+ *  
+ *  Usage:
+ *  
+ *      \mathtip{math}{tip}        % use "tip" (in math mode) as tooltip for "math"
+ *      \texttip{math}{tip}        % use "tip" (in text mode) as tooltip for "math"
+ *      \toggle{math1}{math2}...\endtoggle
+ *                                 % show math1, and when clicked, show math2, and so on.
+ *                                 %   When the last one is clicked, go back to math1.   
+ *  
+ *  ---------------------------------------------------------------------
+ *  
+ *  Copyright (c) 2011-2020 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.
+ */
+
+MathJax.Extension["TeX/action"] = {
+  version: "2.7.9"
+};
+  
+MathJax.Hub.Register.StartupHook("TeX Jax Ready",function () {
+  var TEX = MathJax.InputJax.TeX,
+      MML = MathJax.ElementJax.mml;
+  
+  //
+  //  Set up control sequenecs
+  //
+  TEX.Definitions.Add({
+    macros: {
+      toggle:  'Toggle',
+      mathtip: 'Mathtip',
+      texttip: ['Macro','\\mathtip{#1}{\\text{#2}}',2]
+    }
+  },null,true);
+
+  TEX.Parse.Augment({
+
+    //
+    //  Implement \toggle {math1} {math2} ... \endtoggle
+    //    (as an <maction actiontype="toggle">)
+    //
+    Toggle: function (name) {
+      var data = [], arg;
+      while ((arg = this.GetArgument(name)) !== "\\endtoggle")
+        {data.push(TEX.Parse(arg,this.stack.env).mml())}
+      this.Push(MML.maction.apply(MML,data).With({actiontype: MML.ACTIONTYPE.TOGGLE}));
+    },
+
+    //
+    //  Implement \mathtip{math}{tip}
+    //    (an an <maction actiontype="tooltip">)
+    //
+    Mathtip: function(name) {
+      var arg = this.ParseArg(name), tip = this.ParseArg(name);
+      this.Push(MML.maction(arg,tip).With({actiontype: MML.ACTIONTYPE.TOOLTIP}));
+    }
+  });
+
+  MathJax.Hub.Startup.signal.Post("TeX action Ready");
+  
+});
+
+MathJax.Ajax.loadComplete("[MathJax]/extensions/TeX/action.js");
+// @license-end