--- a/accessible/atk/AccessibleWrap.cpp
+++ b/accessible/atk/AccessibleWrap.cpp
@@ -706,16 +706,19 @@ getRoleCB(AtkObject *aAtkObj)
   if (aAtkObj->role == ATK_ROLE_LIST_BOX && !IsAtkVersionAtLeast(2, 1))
     aAtkObj->role = ATK_ROLE_LIST;
   else if (aAtkObj->role == ATK_ROLE_TABLE_ROW && !IsAtkVersionAtLeast(2, 1))
     aAtkObj->role = ATK_ROLE_LIST_ITEM;
   else if (aAtkObj->role == ATK_ROLE_MATH && !IsAtkVersionAtLeast(2, 12))
     aAtkObj->role = ATK_ROLE_PANEL;
   else if (aAtkObj->role == ATK_ROLE_STATIC && !IsAtkVersionAtLeast(2, 16))
     aAtkObj->role = ATK_ROLE_TEXT;
+  else if ((aAtkObj->role == ATK_ROLE_MATH_FRACTION ||
+            aAtkObj->role == ATK_ROLE_MATH_ROOT) && !IsAtkVersionAtLeast(2, 16))
+    aAtkObj->role = ATK_ROLE_UNKNOWN;
 
   return aAtkObj->role;
 }
 
 static AtkAttributeSet*
 ConvertToAtkAttributeSet(nsIPersistentProperties* aAttributes)
 {
     if (!aAttributes)

--- a/accessible/base/RoleMap.h
+++ b/accessible/base/RoleMap.h
@@ -1125,33 +1125,33 @@ ROLE(MATHML_ROW,
      ATK_ROLE_PANEL,
      NSAccessibilityUnknownRole,
      0,
      IA2_ROLE_UNKNOWN,
      eNoNameRule)
 
 ROLE(MATHML_FRACTION,
      "mathml fraction",
-     ATK_ROLE_UNKNOWN,
+     ATK_ROLE_MATH_FRACTION,
      NSAccessibilityUnknownRole,
      0,
      IA2_ROLE_UNKNOWN,
      eNoNameRule)
 
 ROLE(MATHML_SQUARE_ROOT,
      "mathml square root",
-     ATK_ROLE_UNKNOWN,
+     ATK_ROLE_MATH_ROOT,
      NSAccessibilityUnknownRole,
      0,
      IA2_ROLE_UNKNOWN,
      eNoNameRule)
 
 ROLE(MATHML_ROOT,
      "mathml root",
-     ATK_ROLE_UNKNOWN,
+     ATK_ROLE_MATH_ROOT,
      NSAccessibilityUnknownRole,
      0,
      IA2_ROLE_UNKNOWN,
      eNoNameRule)
 
 ROLE(MATHML_FENCED,
      "mathml fenced",
      ATK_ROLE_PANEL,

--- a/other-licenses/atk-1.0/atk/atkobject.h
+++ b/other-licenses/atk-1.0/atk/atkobject.h
@@ -214,16 +214,20 @@ extern "C" {
  * should not be applied to widgets which are traditionally interactive, objects
  * which display a significant amount of content, or any object which has an
  * accessible relation pointing to another object. Implementors should expose the
  * displayed information through the accessible name of the object. If doing so seems
  * inappropriate, it may indicate that a different role should be used. For
  * labels which describe another widget, see ATK_ROLE_LABEL. For text views, see
  * ATK_ROLE_TEXT. For generic containers, see ATK_ROLE_PANEL. For objects whose
  * role is not known by the implementor, see ATK_ROLE_UNKNOWN. @Since: ATK-2.16.
+ *@ATK_ROLE_MATH_FRACTION: An object that represents a mathematical fraction.
+ * @Since: ATK-2.16.
+ *@ATK_ROLE_MATH_ROOT: An object that represents a mathematical expression
+ * displayed with a radical. @Since: ATK-2.16.
  *@ATK_ROLE_LAST_DEFINED: not a valid role, used for finding end of the enumeration
  *
  * Describes the role of an object
  *
  * These are the built-in enumerated roles that UI components can have in
  * ATK.  Other roles may be added at runtime, so an AtkRole >=
  * ATK_ROLE_LAST_DEFINED is not necessarily an error.
  **/
@@ -342,16 +346,18 @@ typedef enum
   ATK_ROLE_MARQUEE,
   ATK_ROLE_MATH,
   ATK_ROLE_RATING,
   ATK_ROLE_TIMER,
   ATK_ROLE_DESCRIPTION_LIST,
   ATK_ROLE_DESCRIPTION_TERM,
   ATK_ROLE_DESCRIPTION_VALUE,
   ATK_ROLE_STATIC,
+  ATK_ROLE_MATH_FRACTION,
+  ATK_ROLE_MATH_ROOT,
   ATK_ROLE_LAST_DEFINED
 } AtkRole;
 
 AtkRole                  atk_role_register        (const gchar *name);
 
 /**
  *AtkLayer:
  *@ATK_LAYER_INVALID: The object does not have a layer