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diff --git a/js/mathjax/extensions/TeX/mathchoice.js b/js/mathjax/extensions/TeX/mathchoice.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/mathchoice.js
+ *  
+ *  Implements the \mathchoice macro (rarely used)
+ *
+ *  ---------------------------------------------------------------------
+ *  
+ *  Copyright (c) 2009-2020 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.Hub.Register.StartupHook("TeX Jax Ready",function () {
+  var VERSION = "2.7.9";
+
+  var MML = MathJax.ElementJax.mml;
+  var TEX = MathJax.InputJax.TeX;
+  var TEXDEF = TEX.Definitions;
+  
+  TEXDEF.Add({macros: {mathchoice: 'MathChoice'}},null,true);
+
+  TEX.Parse.Augment({
+    MathChoice: function (name) {
+      var D  = this.ParseArg(name),
+          T  = this.ParseArg(name),
+          S  = this.ParseArg(name),
+          SS = this.ParseArg(name);
+      this.Push(MML.TeXmathchoice(D,T,S,SS));
+    }
+  });
+  
+  MML.TeXmathchoice = MML.mbase.Subclass({
+    type: "TeXmathchoice", notParent: true,
+    choice: function () {
+      if (this.selection != null) return this.selection;
+      if (this.choosing) return 2; // prevent infinite loops:  see issue #1151
+      this.choosing = true;
+      var selection = 0, values = this.getValues("displaystyle","scriptlevel");
+      if (values.scriptlevel > 0) {selection = Math.min(3,values.scriptlevel+1)}
+        else {selection = (values.displaystyle ? 0 : 1)}
+      // only cache the result if we are actually in place in a <math> tag.
+      var node = this.inherit; while (node && node.type !== "math") node = node.inherit;
+      if (node) this.selection = selection;
+      this.choosing = false;
+      return selection;
+    },
+    selected: function () {return this.data[this.choice()]},
+    setTeXclass: function (prev) {return this.selected().setTeXclass(prev)},
+    isSpacelike: function () {return this.selected().isSpacelike()},
+    isEmbellished: function () {return this.selected().isEmbellished()},
+    Core: function () {return this.selected()},
+    CoreMO: function () {return this.selected().CoreMO()},
+    toHTML: function (span) {
+      span = this.HTMLcreateSpan(span);
+      span.bbox = this.Core().toHTML(span).bbox;
+      // Firefox doesn't correctly handle a span with a negatively sized content,
+      //   so move marginLeft to main span (this is a hack to get \iiiint to work).
+      //   FIXME:  This is a symptom of a more general problem with Firefox, and
+      //           there probably needs to be a more general solution (e.g., modifying
+      //           HTMLhandleSpace() to get the width and adjust the right margin to
+      //           compensate for negative-width contents)
+      if (span.firstChild && span.firstChild.style.marginLeft) {
+        span.style.marginLeft = span.firstChild.style.marginLeft;
+        span.firstChild.style.marginLeft = "";
+      }
+      return span;
+    },
+    toSVG: function () {
+      var svg = this.Core().toSVG();
+      this.SVGsaveData(svg);
+      return svg;
+    },
+    toCommonHTML: function (node) {
+      node = this.CHTMLcreateNode(node);
+      this.CHTMLhandleStyle(node);
+      this.CHTMLhandleColor(node);
+      this.CHTMLaddChild(node,this.choice(),{});
+      return node;
+    },
+    toPreviewHTML: function(span) {
+      span = this.PHTMLcreateSpan(span);
+      this.PHTMLhandleStyle(span);
+      this.PHTMLhandleColor(span);
+      this.PHTMLaddChild(span,this.choice(),{});
+      return span;
+    }
+  });
+  
+  MathJax.Hub.Startup.signal.Post("TeX mathchoice Ready");
+  
+});
+
+MathJax.Ajax.loadComplete("[MathJax]/extensions/TeX/mathchoice.js");
+// @license-end