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diff --git a/js/mathjax/extensions/TeX/HTML.js b/js/mathjax/extensions/TeX/HTML.js
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+++ b/js/mathjax/extensions/TeX/HTML.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/HTML.js
+ *  
+ *  Implements the \href, \class, \style, \cssId macros.
+ *
+ *  ---------------------------------------------------------------------
+ *  
+ *  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.
+ */
+
+MathJax.Extension["TeX/HTML"] = {
+  version: "2.7.9"
+};
+
+MathJax.Hub.Register.StartupHook("TeX Jax Ready",function () {
+
+  var TEX = MathJax.InputJax.TeX;
+  var TEXDEF = TEX.Definitions;
+  
+  TEXDEF.Add({
+    macros: {
+      href:    'HREF_attribute',
+      "class": 'CLASS_attribute',
+      style:   'STYLE_attribute',
+      cssId:   'ID_attribute'
+    }
+  },null,true);
+
+  TEX.Parse.Augment({
+
+    //
+    //  Implements \href{url}{math}
+    //
+    HREF_attribute: function (name) {
+      var url = this.GetArgument(name),
+          arg = this.GetArgumentMML(name);
+      this.Push(arg.With({href:url}));
+    },
+    
+    //
+    //  Implements \class{name}{math}
+    //
+    CLASS_attribute: function (name) {
+      var CLASS = this.GetArgument(name),
+          arg   = this.GetArgumentMML(name);
+      if (arg["class"] != null) {CLASS = arg["class"] + " " + CLASS}
+      this.Push(arg.With({"class":CLASS}));
+    },
+
+    //
+    //  Implements \style{style-string}{math}
+    //
+    STYLE_attribute: function (name) {
+      var style = this.GetArgument(name),
+          arg   = this.GetArgumentMML(name);
+      // check that it looks like a style string
+      if (arg.style != null) {
+        if (style.charAt(style.length-1) !== ";") {style += ";"}
+        style = arg.style + " " + style;
+      }
+      this.Push(arg.With({style: style}));
+    },
+
+    //
+    //  Implements \cssId{id}{math}
+    //
+    ID_attribute: function (name) {
+      var ID  = this.GetArgument(name),
+          arg = this.GetArgumentMML(name);
+      this.Push(arg.With({id:ID}));
+    },
+
+    //
+    //  returns an argument that is a single MathML element
+    //  (in an mrow if necessary)
+    //
+    GetArgumentMML: function (name) {
+      var arg = this.ParseArg(name);
+      if (arg.inferred && arg.data.length == 1)
+        {arg = arg.data[0]} else {delete arg.inferred}
+      return arg;
+    }
+
+  });
+  
+  MathJax.Hub.Startup.signal.Post("TeX HTML Ready");
+  
+});
+
+MathJax.Ajax.loadComplete("[MathJax]/extensions/TeX/HTML.js");
+// @license-end