Adjust how options are handled, as per Volker's comments.

Author: dpvc

unpacked/jax/output/CommonHTML/jax.js

@@ -2602,6 +2602,7 @@
 
     MML.mrow.Augment({
       toCommonHTML: function (node,options) {
+        options = options || {};
         node = this.CHTMLdefaultNode(node);
         var bbox = this.CHTML, H = bbox.h, D = bbox.d, hasNegative;
         for (var i = 0, m = this.data.length; i < m; i++) {
@@ -2610,7 +2611,7 @@
         }
         if (this.CHTMLlineBreaks()) {
           this.CHTMLmultiline(node);
-          if ((options||{}).autowidth) node.style.width = "";
+          if (options.autowidth) node.style.width = "";
         } else {
           if (hasNegative && bbox.w) node.style.width = CHTML.Em(Math.max(0,bbox.w));
           if (bbox.w < 0) node.style.marginRight = CHTML.Em(bbox.w);