diff --git a/unpacked/jax/output/CommonHTML/jax.js b/unpacked/jax/output/CommonHTML/jax.js
index c8cedc0f7..2e46efdd3 100644
--- a/unpacked/jax/output/CommonHTML/jax.js
+++ b/unpacked/jax/output/CommonHTML/jax.js
@@ -180,7 +180,8 @@
       position:  "absolute",
       width:"1px", height:"60ex"
     },
-    ".mjx-line-box-test": {
+    ".mjx-line-box-test": {display: "table!important"},
+    ".mjx-line-box-test span": {
       display: "table-cell!important",
       width: "10000em!important",
       "min-width":0, "max-width":"none",
@@ -251,7 +252,7 @@
       //
       // Used in preTranslate to get linebreak width
       //
-      this.linebreakSpan = HTML.Element("span",{className:"mjx-line-box-test"});
+      this.linebreakSpan = HTML.Element("span",{className:"mjx-line-box-test"},[["span"]]);
 
       //
       //  Set up styles and preload web fonts
@@ -284,7 +285,7 @@
       document.body.appendChild(this.linebreakSpan);
       this.defaultEm    = this.getFontSize(this.TestSpan);
       this.defaultEx    = this.TestSpan.firstChild.offsetHeight/60;
-      this.defaultWidth = this.linebreakSpan.offsetWidth;
+      this.defaultWidth = this.linebreakSpan.firstChild.offsetWidth;
       document.body.removeChild(this.linebreakSpan);
       document.body.removeChild(this.TestSpan);
     },
@@ -453,7 +454,7 @@
         jax = script.MathJax.elementJax; if (!jax) continue;
         em = CHTML.getFontSize(test);
         ex = test.firstChild.offsetHeight/60;
-        cwidth = Math.max(0,test.previousSibling.offsetWidth-2);
+        cwidth = Math.max(0,test.previousSibling.firstChild.offsetWidth-2);
         if (ex === 0 || ex === "NaN") {
           ex = this.defaultEx;
           cwidth = this.defaultWidth;
diff --git a/unpacked/jax/output/HTML-CSS/jax.js b/unpacked/jax/output/HTML-CSS/jax.js
index 5ac40ac6a..3f4dac9ce 100644
--- a/unpacked/jax/output/HTML-CSS/jax.js
+++ b/unpacked/jax/output/HTML-CSS/jax.js
@@ -339,6 +339,9 @@
           "min-height": 0, "max-height":"none"
         },
         ".MathJax_LineBox": {
+          display: (oldIE ? "block" : "table") + "!important"
+        },
+        ".MathJax_LineBox span": {
           display: (oldIE ? "block" : "table-cell") + "!important",
           width: (oldIE ? "100%" : "10000em") + "!important",
           "min-width":0, "max-width":"none",
@@ -495,7 +498,7 @@
       );
 
       // Used in preTranslate to get linebreak width
-      this.linebreakSpan = MathJax.HTML.Element("span",{className:"MathJax_LineBox"});
+      this.linebreakSpan = MathJax.HTML.Element("span",{className:"MathJax_LineBox"},[["span"]]);
 
       // Set up styles and preload web fonts
       return AJAX.Styles(this.config.styles,["InitializeHTML",this]);
@@ -551,7 +554,7 @@
       document.body.appendChild(this.linebreakSpan);
       this.defaultEx    = this.EmExSpan.firstChild.offsetHeight/60;
       this.defaultEm    = this.EmExSpan.lastChild.firstChild.offsetHeight/60;
-      this.defaultWidth = this.linebreakSpan.offsetWidth;
+      this.defaultWidth = this.linebreakSpan.firstChild.offsetWidth;
       document.body.removeChild(this.linebreakSpan);
       document.body.removeChild(this.EmExSpan);
     },
@@ -621,7 +624,7 @@
         jax = script.MathJax.elementJax; if (!jax) continue;
         ex = test.firstChild.offsetHeight/60;
         em = test.lastChild.firstChild.offsetHeight/60;
-        cwidth = Math.max(0,div.previousSibling.offsetWidth - 2);
+        cwidth = Math.max(0,div.previousSibling.firstChild.offsetWidth - 2);
         if (relwidth) {maxwidth = cwidth}
         if (ex === 0 || ex === "NaN") {
           // can't read width, so move to hidden div for processing
diff --git a/unpacked/jax/output/SVG/jax.js b/unpacked/jax/output/SVG/jax.js
index d6b7f4274..7b2765f15 100644
--- a/unpacked/jax/output/SVG/jax.js
+++ b/unpacked/jax/output/SVG/jax.js
@@ -100,7 +100,8 @@
           "min-height": 0, "max-height":"none",
           padding:0, border: 0, margin: 0
         },
-        ".MathJax_SVG_LineBox": {
+        ".MathJax_SVG_LineBox": {display: "table!important"},
+        ".MathJax_SVG_LineBox span": {
           display: "table-cell!important",
           width: "10000em!important",
           "min-width":0, "max-width":"none",
@@ -179,7 +180,7 @@
       );
 
       // Used in preTranslate to get linebreak width
-      this.linebreakSpan = HTML.Element("span",{className:"MathJax_SVG_LineBox"});
+      this.linebreakSpan = HTML.Element("span",{className:"MathJax_SVG_LineBox"},[["span"]]);
 
       // Set up styles
       return AJAX.Styles(this.config.styles,["InitializeSVG",this]);
@@ -195,7 +196,7 @@
       document.body.appendChild(this.ExSpan);
       document.body.appendChild(this.linebreakSpan);
       this.defaultEx    = this.ExSpan.firstChild.offsetHeight/60;
-      this.defaultWidth = this.linebreakSpan.offsetWidth;
+      this.defaultWidth = this.linebreakSpan.firstChild.offsetWidth;
       document.body.removeChild(this.linebreakSpan);
       document.body.removeChild(this.ExSpan);
     },
@@ -261,7 +262,7 @@
         test = script.previousSibling; div = test.previousSibling;
         jax = script.MathJax.elementJax; if (!jax) continue;
         ex = test.firstChild.offsetHeight/60;
-        cwidth = Math.max(0,(div.previousSibling.offsetWidth-2) / this.config.scale * 100);
+        cwidth = Math.max(0,(div.previousSibling.firstChild.offsetWidth-2) / this.config.scale * 100);
         if (ex === 0 || ex === "NaN") {
           // can't read width, so move to hidden div for processing
           // (this will cause a reflow for each math element that is hidden)