diff --git a/unpacked/jax/output/CommonHTML/autoload/mtable.js b/unpacked/jax/output/CommonHTML/autoload/mtable.js
index fa04bd626..ae8320d29 100644
--- a/unpacked/jax/output/CommonHTML/autoload/mtable.js
+++ b/unpacked/jax/output/CommonHTML/autoload/mtable.js
@@ -52,6 +52,8 @@ MathJax.Hub.Register.StartupHook("CommonHTML Jax Ready",function () {
                                   "columnwidth","equalcolumns","equalrows",
                                   "columnlines","rowlines","frame","framespacing",
                                   "align","width","side","minlabelspacing","useHeight");
+      var t = CHTML.TEX.min_rule_thickness/CHTML.em;
+      state.t = CHTML.Px(t*this.CHTML.scale,1);
       //
       //  Create the table
       //
@@ -63,7 +65,7 @@ MathJax.Hub.Register.StartupHook("CommonHTML Jax Ready",function () {
         state.DD = Math.max.apply(Math,state.D);
       }
       this.CHTMLadjustCells(values,state);
-      if (values.frame) table.style.border = "1px "+values.frame;
+      if (values.frame) table.style.border = state.t+" "+values.frame;
       this.CHTMLalignV(values,state,node);
       this.CHTMLcolumnWidths(values,state,node);
       this.CHTMLstretchCells(values,state);
@@ -196,7 +198,7 @@ MathJax.Hub.Register.StartupHook("CommonHTML Jax Ready",function () {
         //
         B = RSPACE[i]/2; border = null; L = "0";
         if (RLINES[i] !== MML.LINES.NONE) {
-          border = "1px "+RLINES[i];
+          border = state.t+" "+RLINES[i];
           B -= 1/CHTML.em/2;
         }
         B = CHTML.Em(Math.max(0,B));
@@ -215,7 +217,7 @@ MathJax.Hub.Register.StartupHook("CommonHTML Jax Ready",function () {
           //
           R = CSPACE[j]/2;
           if (CLINES[j] !== MML.LINES.NONE) {
-            cell.borderRight = "1px "+CLINES[j];
+            cell.borderRight = state.t+" "+CLINES[j];
             R -= 1/CHTML.em/2;
           }
           R = CHTML.Em(Math.max(0,R));
diff --git a/unpacked/jax/output/CommonHTML/jax.js b/unpacked/jax/output/CommonHTML/jax.js
index 9559c8306..6bdd11e82 100644
--- a/unpacked/jax/output/CommonHTML/jax.js
+++ b/unpacked/jax/output/CommonHTML/jax.js
@@ -1204,8 +1204,9 @@
     unEm: function (m) {
       return parseFloat(m);
     },
-    Px: function (m) {
+    Px: function (m,M) {
       m *= this.em;
+      if (M && m < M) m = M;
       if (Math.abs(m) < .1) return "0";
       return m.toFixed(1).replace(/\.0$/,"")+"px";
     },
@@ -2409,7 +2410,7 @@
             q = (u - nbox.d*nscale) - (a + t/2); if (q < p) u += (p - q);
             q = (a - t/2) - (dbox.h*dscale - v); if (q < p) v += (p - q);
             frac.style.verticalAlign = CHTML.Em(t/2-v);
-            num.style.borderBottom = CHTML.Px(t/nscale*nbox.scale)+" solid";
+            num.style.borderBottom = CHTML.Px(t/nscale*nbox.scale,1)+" solid";
             num.className += " MJXc-fpad";   nbox.L = nbox.R = .1;
             denom.className += " MJXc-fpad"; dbox.L = dbox.R = .1;
           }
@@ -2460,7 +2461,7 @@
         H = bbox.h + q + t;
         var x = this.CHTMLaddRoot(node,sbox,sbox.h+sbox.d-H);
         base.style.paddingTop = CHTML.Em(q); 
-        base.style.borderTop = CHTML.Px(T*bbox.scale)+" solid";
+        base.style.borderTop = CHTML.Px(T*bbox.scale,1)+" solid";
         sqrt.style.paddingTop = CHTML.Em(2*t-T);  // use wider line, but don't affect height
         bbox.h += q + 2*t;
         BBOX.combine(sbox,x,H-sbox.h);