--- a/accessible/public/nsIAccessibleRelation.idl
+++ b/accessible/public/nsIAccessibleRelation.idl
@@ -6,17 +6,17 @@
 #include "nsISupports.idl"
 #include "nsIArray.idl"
 
 interface nsIAccessible;
 
 /**
  * This interface gives access to an accessible's set of relations.
  */
-[scriptable, uuid(9f85fc0d-2969-48e6-b822-68140f7e5770)]
+[scriptable, uuid(55b308c4-2ae4-46bc-b4cd-4d4370e0a660)]
 interface nsIAccessibleRelation : nsISupports
 {
   /**
    * This object is labelled by a target object.
    */
   const unsigned long RELATION_LABELLED_BY = 0x00;
 
   /**
@@ -105,16 +105,31 @@ interface nsIAccessibleRelation : nsISup
 
   /**
    * Part of a form/dialog with a related default button. It is used for
    * MSAA/XPCOM, it isn't for IA2 or ATK.
    */
   const unsigned long RELATION_DEFAULT_BUTTON = 0x10;
 
   /**
+   * The target object is the containing document object.
+   */
+  const unsigned long RELATION_CONTAINING_DOCUMENT = 0x11;
+
+  /**
+   * The target object is the topmost containing document object in the tab pane.
+   */
+  const unsigned long RELATION_CONTAINING_TAB_PANE = 0x12;
+
+  /**
+   * The target object is the containing application object.
+   */
+  const unsigned long RELATION_CONTAINING_APPLICATION = 0x14;
+
+  /**
    * Returns the type of the relation.
    */
   readonly attribute unsigned long relationType;
 
   /**
    * Returns the number of targets for this relation.
    */
   readonly attribute unsigned long targetsCount;

--- a/accessible/src/base/RelationType.h
+++ b/accessible/src/base/RelationType.h
@@ -104,16 +104,36 @@ MOZ_BEGIN_ENUM_CLASS(RelationType)
   PARENT_WINDOW_OF = 0x0f,
 
   /**
    * Part of a form/dialog with a related default button. It is used for
    * MSAA/XPCOM, it isn't for IA2 or ATK.
    */
   DEFAULT_BUTTON = 0x10,
 
-  LAST = DEFAULT_BUTTON
+  /**
+   * The target object is the containing document object.
+   */
+  CONTAINING_DOCUMENT = 0x11,
+
+  /**
+   * The target object is the topmost containing document object in the tab pane.
+   */
+  CONTAINING_TAB_PANE = 0x12,
+
+  /**
+   * The target object is the containing window object.
+   */
+  CONTAINING_WINDOW = 0x13,
+
+  /**
+   * The target object is the containing application object.
+   */
+  CONTAINING_APPLICATION = 0x14,
+
+  LAST = CONTAINING_APPLICATION
 
 MOZ_END_ENUM_CLASS(RelationType)
 
 } // namespace a11y
 } // namespace mozilla
 
 #endif

--- a/accessible/src/base/RelationTypeMap.h
+++ b/accessible/src/base/RelationTypeMap.h
@@ -105,8 +105,26 @@ RELATIONTYPE(PARENT_WINDOW_OF,
              NAVRELATION_PARENT_WINDOW_OF,
              IA2_RELATION_PARENT_WINDOW_OF)
 
 RELATIONTYPE(DEFAULT_BUTTON,
              "default button",
              ATK_RELATION_NULL,
              NAVRELATION_DEFAULT_BUTTON,
              IA2_RELATION_NULL)
+
+RELATIONTYPE(CONTAINING_DOCUMENT,
+             "containing document",
+             ATK_RELATION_NULL,
+             NAVRELATION_CONTAINING_DOCUMENT,
+             IA2_RELATION_CONTAINING_DOCUMENT)
+
+RELATIONTYPE(CONTAINING_TAB_PANE,
+             "containing tab pane",
+             ATK_RELATION_NULL,
+             NAVRELATION_CONTAINING_TAB_PANE,
+             IA2_RELATION_CONTAINING_TAB_PANE)
+
+RELATIONTYPE(CONTAINING_APPLICATION,
+             "containing application",
+             ATK_RELATION_NULL,
+             NAVRELATION_CONTAINING_APPLICATION,
+             IA2_RELATION_CONTAINING_APPLICATION)

--- a/accessible/src/generic/Accessible.cpp
+++ b/accessible/src/generic/Accessible.cpp
@@ -8,16 +8,18 @@
 #include "nsIXBLAccessible.h"
 
 #include "AccCollector.h"
 #include "AccGroupInfo.h"
 #include "AccIterator.h"
 #include "nsAccUtils.h"
 #include "nsAccessibleRelation.h"
 #include "nsAccessibilityService.h"
+#include "ApplicationAccessible.h"
+#include "nsCoreUtils.h"
 #include "nsIAccessibleRelation.h"
 #include "nsIAccessibleRole.h"
 #include "nsEventShell.h"
 #include "nsTextEquivUtils.h"
 #include "Relation.h"
 #include "Role.h"
 #include "RootAccessible.h"
 #include "States.h"
@@ -2175,16 +2177,43 @@ Accessible::RelationByType(RelationType 
           }
           nsCOMPtr<nsIContent> relatedContent(do_QueryInterface(buttonEl));
           return Relation(mDoc, relatedContent);
         }
       }
       return Relation();
     }
 
+    case RelationType::CONTAINING_DOCUMENT:
+      return Relation(mDoc);
+
+    case RelationType::CONTAINING_TAB_PANE: {
+      nsCOMPtr<nsIDocShell> docShell =
+        nsCoreUtils::GetDocShellFor(GetNode());
+      if (docShell) {
+        // Walk up the parent chain without crossing the boundary at which item
+        // types change, preventing us from walking up out of tab content.
+        nsCOMPtr<nsIDocShellTreeItem> root;
+        docShell->GetSameTypeRootTreeItem(getter_AddRefs(root));
+        if (root) {
+          // If the item type is typeContent, we assume we are in browser tab
+          // content. Note, this includes content such as about:addons,
+          // for consistency.
+          int32_t itemType = 0;
+          root->GetItemType(&itemType);
+          if (itemType == nsIDocShellTreeItem::typeContent)
+            return Relation(nsAccUtils::GetDocAccessibleFor(root));
+        }
+      }
+      return  Relation();
+    }
+
+    case RelationType::CONTAINING_APPLICATION:
+      return Relation(ApplicationAcc());
+
     default:
       return Relation();
   }
 }
 
 NS_IMETHODIMP
 Accessible::GetRelations(nsIArray **aRelations)
 {
@@ -2209,17 +2238,20 @@ Accessible::GetRelations(nsIArray **aRel
     nsIAccessibleRelation::RELATION_FLOWS_TO,
     nsIAccessibleRelation::RELATION_FLOWS_FROM,
     nsIAccessibleRelation::RELATION_MEMBER_OF,
     nsIAccessibleRelation::RELATION_SUBWINDOW_OF,
     nsIAccessibleRelation::RELATION_EMBEDS,
     nsIAccessibleRelation::RELATION_EMBEDDED_BY,
     nsIAccessibleRelation::RELATION_POPUP_FOR,
     nsIAccessibleRelation::RELATION_PARENT_WINDOW_OF,
-    nsIAccessibleRelation::RELATION_DEFAULT_BUTTON
+    nsIAccessibleRelation::RELATION_DEFAULT_BUTTON,
+    nsIAccessibleRelation::RELATION_CONTAINING_DOCUMENT,
+    nsIAccessibleRelation::RELATION_CONTAINING_TAB_PANE,
+    nsIAccessibleRelation::RELATION_CONTAINING_APPLICATION
   };
 
   for (uint32_t idx = 0; idx < ArrayLength(relationTypes); idx++) {
     nsCOMPtr<nsIAccessibleRelation> relation;
     nsresult rv = GetRelationByType(relationTypes[idx], getter_AddRefs(relation));
 
     if (NS_SUCCEEDED(rv) && relation) {
       uint32_t targets = 0;

--- a/accessible/src/windows/msaa/AccessibleWrap.h
+++ b/accessible/src/windows/msaa/AccessibleWrap.h
@@ -197,16 +197,19 @@ protected:
     NAVRELATION_SUBWINDOW_OF = 0x1008,
     NAVRELATION_EMBEDS = 0x1009,
     NAVRELATION_EMBEDDED_BY = 0x100a,
     NAVRELATION_POPUP_FOR = 0x100b,
     NAVRELATION_PARENT_WINDOW_OF = 0x100c,
     NAVRELATION_DEFAULT_BUTTON = 0x100d,
     NAVRELATION_DESCRIBED_BY = 0x100e,
     NAVRELATION_DESCRIPTION_FOR = 0x100f,
-    NAVRELATION_NODE_PARENT_OF = 0x1010
+    NAVRELATION_NODE_PARENT_OF = 0x1010,
+    NAVRELATION_CONTAINING_DOCUMENT = 0x1011,
+    NAVRELATION_CONTAINING_TAB_PANE = 0x1012,
+    NAVRELATION_CONTAINING_APPLICATION = 0x1014
   };
 };
 
 } // namespace a11y
 } // namespace mozilla
 
 #endif

--- a/accessible/src/windows/msaa/ServiceProvider.cpp
+++ b/accessible/src/windows/msaa/ServiceProvider.cpp
@@ -6,16 +6,17 @@
 
 #include "ServiceProvider.h"
 
 #include "ApplicationAccessibleWrap.h"
 #include "Compatibility.h"
 #include "DocAccessible.h"
 #include "nsAccUtils.h"
 #include "nsCoreUtils.h"
+#include "Relation.h"
 #include "uiaRawElmProvider.h"
 
 #include "mozilla/Preferences.h"
 #include "nsIDocShell.h"
 
 #include "ISimpleDOMNode_i.c"
 
 namespace mozilla {
@@ -55,43 +56,22 @@ ServiceProvider::QueryService(REFGUID aG
   // A use case for this is for screen readers that need to switch context or
   // 'virtual buffer' when focus moves from one browser tab area to another.
   static const GUID SID_IAccessibleContentDocument =
     { 0xa5d8e1f3,0x3571,0x4d8f,{0x95,0x21,0x07,0xed,0x28,0xfb,0x07,0x2e} };
   if (aGuidService == SID_IAccessibleContentDocument) {
     if (aIID != IID_IAccessible)
       return E_NOINTERFACE;
 
-    nsCOMPtr<nsIDocShell> docShell =
-      nsCoreUtils::GetDocShellFor(mAccessible->GetNode());
-    if (!docShell)
-      return E_UNEXPECTED;
-
-    // Walk up the parent chain without crossing the boundary at which item
-    // types change, preventing us from walking up out of tab content.
-    nsCOMPtr<nsIDocShellTreeItem> root;
-    docShell->GetSameTypeRootTreeItem(getter_AddRefs(root));
-    if (!root)
-      return E_UNEXPECTED;
-
-
-    // If the item type is typeContent, we assume we are in browser tab content.
-    // Note this includes content such as about:addons, for consistency.
-    int32_t itemType;
-    root->GetItemType(&itemType);
-    if (itemType != nsIDocShellTreeItem::typeContent)
+    Relation rel = mAccessible->RelationByType(RelationType::CONTAINING_TAB_PANE);
+    AccessibleWrap* tabDoc = static_cast<AccessibleWrap*>(rel.Next());
+    if (!tabDoc)
       return E_NOINTERFACE;
 
-    // Make sure this is a document.
-    DocAccessible* docAcc = nsAccUtils::GetDocAccessibleFor(root);
-    if (!docAcc)
-      return E_UNEXPECTED;
-
-    *aInstancePtr = static_cast<IAccessible*>(docAcc);
-
+    *aInstancePtr = static_cast<IAccessible*>(tabDoc);
     (reinterpret_cast<IUnknown*>(*aInstancePtr))->AddRef();
     return S_OK;
   }
 
   // Can get to IAccessibleApplication from any node via QS
   if (aGuidService == IID_IAccessibleApplication ||
       (Compatibility::IsJAWS() && aIID == IID_IAccessibleApplication)) {
     ApplicationAccessibleWrap* applicationAcc =

--- a/accessible/tests/mochitest/relations.js
+++ b/accessible/tests/mochitest/relations.js
@@ -13,16 +13,19 @@ const RELATION_FLOWS_TO = nsIAccessibleR
 const RELATION_LABEL_FOR = nsIAccessibleRelation.RELATION_LABEL_FOR;
 const RELATION_LABELLED_BY = nsIAccessibleRelation.RELATION_LABELLED_BY;
 const RELATION_MEMBER_OF = nsIAccessibleRelation.RELATION_MEMBER_OF;
 const RELATION_NODE_CHILD_OF = nsIAccessibleRelation.RELATION_NODE_CHILD_OF;
 const RELATION_NODE_PARENT_OF = nsIAccessibleRelation.RELATION_NODE_PARENT_OF;
 const RELATION_PARENT_WINDOW_OF = nsIAccessibleRelation.RELATION_PARENT_WINDOW_OF;
 const RELATION_POPUP_FOR = nsIAccessibleRelation.RELATION_POPUP_FOR;
 const RELATION_SUBWINDOW_OF = nsIAccessibleRelation.RELATION_SUBWINDOW_OF;
+const RELATION_CONTAINING_DOCUMENT = nsIAccessibleRelation.RELATION_CONTAINING_DOCUMENT;
+const RELATION_CONTAINING_TAB_PANE = nsIAccessibleRelation.RELATION_CONTAINING_TAB_PANE;
+const RELATION_CONTAINING_APPLICATION = nsIAccessibleRelation.RELATION_CONTAINING_APPLICATION;
 
 ////////////////////////////////////////////////////////////////////////////////
 // General
 
 /**
  * Test the accessible relation.
  *
  * @param aIdentifier          [in] identifier to get an accessible, may be ID

--- a/accessible/tests/mochitest/relations/test_general.html
+++ b/accessible/tests/mochitest/relations/test_general.html
@@ -162,16 +162,21 @@
       testRelation("caption", RELATION_LABEL_FOR, "table");
       testRelation("table", RELATION_LABELLED_BY, "caption");
 
       // 'labelled by'/'label for' relation for html:fieldset and
       // html:legend
       testRelation("legend", RELATION_LABEL_FOR, "fieldset");
       testRelation("fieldset", RELATION_LABELLED_BY, "legend");
 
+      // containing relations
+      testRelation("control1_1", RELATION_CONTAINING_DOCUMENT, document);
+      testRelation("control1_1", RELATION_CONTAINING_TAB_PANE, getTabDocAccessible("control1_1"));
+      testRelation("control1_1", RELATION_CONTAINING_APPLICATION, getApplicationAccessible());
+
       // finish test
       SimpleTest.finish();
     }
 
     disableLogging(); // from test_embeds.xul
     SimpleTest.waitForExplicitFinish();
     addA11yLoadEvent(doTest);
   </script>