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diff --git a/js/mathjax/extensions/TeX/cancel.js b/js/mathjax/extensions/TeX/cancel.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/cancel.js
+ *  
+ *  Implements the \cancel, \bcancel, \xcancel, and \cancelto macros.
+ *  
+ *  Usage:
+ *  
+ *      \cancel{math}            % strikeout math from lower left to upper right
+ *      \bcancel{math}           % strikeout from upper left to lower right
+ *      \xcancel{math}           % strikeout with an X
+ *      \cancelto{value}{math}   % strikeout with arrow going to value
+ *  
+ *  ---------------------------------------------------------------------
+ *  
+ *  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/cancel"] = {
+  version: "2.7.9",
+
+  //
+  //  The attributes allowed in \enclose{notation}[attributes]{math}
+  //
+  ALLOWED: {
+    color: 1, mathcolor: 1,
+    background: 1, mathbackground: 1,
+    padding: 1,
+    thickness: 1
+  }
+};
+
+MathJax.Hub.Register.StartupHook("TeX Jax Ready",function () {
+  var TEX = MathJax.InputJax.TeX,
+      MML = MathJax.ElementJax.mml,
+      CANCEL = MathJax.Extension["TeX/cancel"];
+      
+      CANCEL.setAttributes = function (def,attr) {
+        if (attr !== "") {
+          attr = attr.replace(/ /g,"").split(/,/);
+          for (var i = 0, m = attr.length; i < m; i++) {
+            var keyvalue = attr[i].split(/[:=]/);
+            if (CANCEL.ALLOWED[keyvalue[0]]) {
+              if (keyvalue[1] === "true") {keyvalue[1] = true}
+              if (keyvalue[1] === "false") {keyvalue[1] = false}
+              def[keyvalue[0]] = keyvalue[1];
+            }
+          }
+        }
+        return def;
+      };
+  
+  //
+  //  Set up macros
+  //
+  TEX.Definitions.Add({
+    macros: {
+      cancel:   ['Cancel',MML.NOTATION.UPDIAGONALSTRIKE],
+      bcancel:  ['Cancel',MML.NOTATION.DOWNDIAGONALSTRIKE],
+      xcancel:  ['Cancel',MML.NOTATION.UPDIAGONALSTRIKE+" "+MML.NOTATION.DOWNDIAGONALSTRIKE],
+      cancelto: 'CancelTo'
+    }
+  },null,true);
+
+  TEX.Parse.Augment({
+    //
+    //  Implement \cancel[attributes]{math},
+    //            \bcancel[attributes]{math}, and
+    //            \xcancel[attributes]{math}
+    //
+    Cancel: function(name,notation) {
+      var attr = this.GetBrackets(name,""), math = this.ParseArg(name);
+      var def = CANCEL.setAttributes({notation: notation},attr);
+      this.Push(MML.menclose(math).With(def));
+    },
+    
+    //
+    //  Implement \cancelto{value}[attributes]{math}
+    //
+    CancelTo: function(name,notation) {
+      var value = this.ParseArg(name),
+          attr = this.GetBrackets(name,""),
+          math = this.ParseArg(name);
+      var def = CANCEL.setAttributes({notation: MML.NOTATION.UPDIAGONALSTRIKE+" "+MML.NOTATION.UPDIAGONALARROW},attr);
+      value = MML.mpadded(value).With({depth:"-.1em",height:"+.1em",voffset:".1em"});
+      this.Push(MML.msup(MML.menclose(math).With(def),value));
+    }
+
+  });
+
+  MathJax.Hub.Startup.signal.Post("TeX cancel Ready");
+  
+});
+
+MathJax.Ajax.loadComplete("[MathJax]/extensions/TeX/cancel.js");
+// @license-end