Add a "!=" reftest that will fail is msub and msup break (like in
bug 345564)
new file mode 100644
--- /dev/null
+++ b/layout/reftests/bugs/345563-sub.xhtml
@@ -0,0 +1,22 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1 plus MathML 2.0//EN" "http://www.w3.org/Math/DTD/mathml2/xhtml-math11-f.dtd" >
+
+<html xmlns="http://www.w3.org/1999/xhtml">
+
+<head>
+
+</head>
+
+<body>
+
+<p>
+ <math xmlns="http://www.w3.org/1998/Math/MathML">
+ <msub>
+ <mi>x</mi>
+ <mn>2</mn>
+ </msub>
+ </math>
+</p>
+
+</body>
+
+</html>
new file mode 100644
--- /dev/null
+++ b/layout/reftests/bugs/345563-sup.xhtml
@@ -0,0 +1,22 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1 plus MathML 2.0//EN" "http://www.w3.org/Math/DTD/mathml2/xhtml-math11-f.dtd" >
+
+<html xmlns="http://www.w3.org/1999/xhtml">
+
+<head>
+
+</head>
+
+<body>
+
+<p>
+ <math xmlns="http://www.w3.org/1998/Math/MathML">
+ <msup>
+ <mi>x</mi>
+ <mn>2</mn>
+ </msup>
+ </math>
+</p>
+
+</body>
+
+</html>
--- a/layout/reftests/bugs/reftest.list
+++ b/layout/reftests/bugs/reftest.list
@@ -294,16 +294,17 @@ random-if(MOZ_WIDGET_TOOLKIT=="gtk2") ==
== 339289-1.html 339289-1-ref.html
== 341043-1a.html 341043-1-ref.html
!= 341043-1b.html 341043-1-ref.html
== 343540-1.html 343540-1-ref.html
== 345267-1a.html 345267-1-ref.html
== 345267-1b.html 345267-1-ref.html
== 345267-1c.html 345267-1-ref.html
== 345267-1d.html 345267-1-ref.html
+!= 345563-sub.xhtml 345563-sup.xhtml
== 346774-1a.html 346774-1-ref.html
== 346774-1b.html 346774-1-ref.html
== 346774-1c.html 346774-1-ref.html
== 347348-1.xhtml 347348-1-ref.xhtml
skip-if(MOZ_WIDGET_TOOLKIT=="windows") == 347496-1.xhtml 347496-1-ref.xhtml # Bug 409150
== 347912-1.html 347912-1-ref.html
== 348049-1.xhtml 348049-1-ref.xhtml
== 348516-1.html 348516-1-ref.html
