From 3b35ca9e1665dd280e16896be7a5215662af75ad Mon Sep 17 00:00:00 2001
From: "Davide P. Cervone" <dpvc@union.edu>
Date: Thu, 6 Feb 2014 13:18:04 -0500
Subject: [PATCH 1/2] Add more tests to check that the math is still in the
 page.  Should resolve issue #730 (though we don't have their page and can't
 really test it).

---
 unpacked/jax/output/HTML-CSS/jax.js  | 3 ++-
 unpacked/jax/output/NativeMML/jax.js | 4 ++--
 unpacked/jax/output/SVG/jax.js       | 3 ++-
 3 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/unpacked/jax/output/HTML-CSS/jax.js b/unpacked/jax/output/HTML-CSS/jax.js
index 6ece947af..ba2447e34 100644
--- a/unpacked/jax/output/HTML-CSS/jax.js
+++ b/unpacked/jax/output/HTML-CSS/jax.js
@@ -579,7 +579,8 @@
       //
       var jax = script.MathJax.elementJax, math = jax.root,
           span = document.getElementById(jax.inputID+"-Frame"),
-          div = (jax.HTMLCSS.display ? span.parentNode : span);
+          div = (jax.HTMLCSS.display ? (span||{}).parentNode : span);
+      if (!span || !div) return;
       //
       //  Set the font metrics
       //
diff --git a/unpacked/jax/output/NativeMML/jax.js b/unpacked/jax/output/NativeMML/jax.js
index 7e38c035e..74e7224c4 100644
--- a/unpacked/jax/output/NativeMML/jax.js
+++ b/unpacked/jax/output/NativeMML/jax.js
@@ -286,8 +286,8 @@
       //  Get the jax and the container and set the size
       //
       var jax = script.MathJax.elementJax, math = jax.root;
-      var span = document.getElementById(jax.inputID+"-Frame"),
-	  container = span.firstChild, mspan = container.firstChild;
+      var span = document.getElementById(jax.inputID+"-Frame"); if (!span) return;
+      var container = span.firstChild, mspan = container.firstChild;
       this.ex = jax.NativeMML.ex || this.defaultEx;
       this.scale = jax.NativeMML.scale || 1;
       if (this.scale !== 1) {span.style.fontSize = jax.NativeMML.fontSize}
diff --git a/unpacked/jax/output/SVG/jax.js b/unpacked/jax/output/SVG/jax.js
index 7a44aeee0..6c46ee18a 100644
--- a/unpacked/jax/output/SVG/jax.js
+++ b/unpacked/jax/output/SVG/jax.js
@@ -289,7 +289,8 @@
       //
       var jax = script.MathJax.elementJax, math = jax.root,
           span = document.getElementById(jax.inputID+"-Frame"),
-          div = (jax.SVG.display ? span.parentNode : span);
+          div = (jax.SVG.display ? (span||{}).parentNode : span);
+      if (!span || !div) return;
       //
       //  Set the font metrics
       //

From f1f109b586d52251c6ba4b6ebdd651b22ec49333 Mon Sep 17 00:00:00 2001
From: "Davide P. Cervone" <dpvc@union.edu>
Date: Fri, 7 Feb 2014 09:39:56 -0500
Subject: [PATCH 2/2] Remove redundent check (if span is null, then div will be
 null, so only need to check for div).  Issue #730.

---
 unpacked/jax/output/HTML-CSS/jax.js | 2 +-
 unpacked/jax/output/SVG/jax.js      | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/unpacked/jax/output/HTML-CSS/jax.js b/unpacked/jax/output/HTML-CSS/jax.js
index ba2447e34..676a034cd 100644
--- a/unpacked/jax/output/HTML-CSS/jax.js
+++ b/unpacked/jax/output/HTML-CSS/jax.js
@@ -580,7 +580,7 @@
       var jax = script.MathJax.elementJax, math = jax.root,
           span = document.getElementById(jax.inputID+"-Frame"),
           div = (jax.HTMLCSS.display ? (span||{}).parentNode : span);
-      if (!span || !div) return;
+      if (!div) return;
       //
       //  Set the font metrics
       //
diff --git a/unpacked/jax/output/SVG/jax.js b/unpacked/jax/output/SVG/jax.js
index 6c46ee18a..389386e91 100644
--- a/unpacked/jax/output/SVG/jax.js
+++ b/unpacked/jax/output/SVG/jax.js
@@ -290,7 +290,7 @@
       var jax = script.MathJax.elementJax, math = jax.root,
           span = document.getElementById(jax.inputID+"-Frame"),
           div = (jax.SVG.display ? (span||{}).parentNode : span);
-      if (!span || !div) return;
+      if (!div) return;
       //
       //  Set the font metrics
       //