diff --git a/accessible/ipc/ProxyAccessibleShared.h b/accessible/ipc/ProxyAccessibleShared.h
index 8ce19fc414fee..e035edef71e9e 100644
--- a/accessible/ipc/ProxyAccessibleShared.h
+++ b/accessible/ipc/ProxyAccessibleShared.h
@@ -65,7 +65,7 @@ nsAtom* LandmarkRole() const;
 
 nsStaticAtom* ARIARoleAtom() const;
 
-int32_t GetLevelInternal();
+mozilla::a11y::GroupPos GroupPosition();
 void ScrollTo(uint32_t aScrollType);
 void ScrollToPoint(uint32_t aScrollType, int32_t aX, int32_t aY);
 
diff --git a/accessible/ipc/other/DocAccessibleChild.cpp b/accessible/ipc/other/DocAccessibleChild.cpp
index 4b7bf424c5cc2..25bf68da4e0ca 100644
--- a/accessible/ipc/other/DocAccessibleChild.cpp
+++ b/accessible/ipc/other/DocAccessibleChild.cpp
@@ -234,12 +234,17 @@ mozilla::ipc::IPCResult DocAccessibleChild::RecvARIARoleAtom(
   return IPC_OK();
 }
 
-mozilla::ipc::IPCResult DocAccessibleChild::RecvGetLevelInternal(
-    const uint64_t& aID, int32_t* aLevel) {
+mozilla::ipc::IPCResult DocAccessibleChild::RecvGroupPosition(
+    const uint64_t& aID, int32_t* aLevel, int32_t* aSimilarItemsInGroup,
+    int32_t* aPositionInGroup) {
   Accessible* acc = IdToAccessible(aID);
   if (acc) {
-    *aLevel = acc->GetLevelInternal();
+    GroupPos groupPos = acc->GroupPosition();
+    *aLevel = groupPos.level;
+    *aSimilarItemsInGroup = groupPos.setSize;
+    *aPositionInGroup = groupPos.posInSet;
   }
+
   return IPC_OK();
 }
 
diff --git a/accessible/ipc/other/DocAccessibleChild.h b/accessible/ipc/other/DocAccessibleChild.h
index 9476dd2868d49..719412053dccb 100644
--- a/accessible/ipc/other/DocAccessibleChild.h
+++ b/accessible/ipc/other/DocAccessibleChild.h
@@ -84,8 +84,9 @@ class DocAccessibleChild : public DocAccessibleChildBase {
   virtual mozilla::ipc::IPCResult RecvARIARoleAtom(const uint64_t& aID,
                                                    nsString* aRole) override;
 
-  virtual mozilla::ipc::IPCResult RecvGetLevelInternal(
-      const uint64_t& aID, int32_t* aLevel) override;
+  virtual mozilla::ipc::IPCResult RecvGroupPosition(
+      const uint64_t& aID, int32_t* aLevel, int32_t* aSimilarItemsInGroup,
+      int32_t* aPositionInGroup) override;
 
   virtual mozilla::ipc::IPCResult RecvAttributes(
       const uint64_t& aID, nsTArray<Attribute>* aAttributes) override;
diff --git a/accessible/ipc/other/PDocAccessible.ipdl b/accessible/ipc/other/PDocAccessible.ipdl
index 26b7022c3f049..64becca903fd5 100644
--- a/accessible/ipc/other/PDocAccessible.ipdl
+++ b/accessible/ipc/other/PDocAccessible.ipdl
@@ -137,7 +137,8 @@ child:
   nested(inside_sync) sync IsSearchbox(uint64_t aID) returns(bool retval);
   nested(inside_sync) sync LandmarkRole(uint64_t aID) returns(nsString landmark);
   nested(inside_sync) sync ARIARoleAtom(uint64_t aID) returns(nsString ariaRole);
-  nested(inside_sync) sync GetLevelInternal(uint64_t aID) returns(int32_t aLevel);
+  nested(inside_sync) sync GroupPosition(uint64_t aID)
+    returns(int32_t groupLevel, int32_t similarItemsInGroup, int32_t positionInGroup);
   async ScrollTo(uint64_t aID, uint32_t aScrollType);
   async ScrollToPoint(uint64_t aID, uint32_t aScrollType, int32_t aX,
                       int32_t aY);
diff --git a/accessible/ipc/other/ProxyAccessible.cpp b/accessible/ipc/other/ProxyAccessible.cpp
index 9361cf8303176..6f28370e64f86 100644
--- a/accessible/ipc/other/ProxyAccessible.cpp
+++ b/accessible/ipc/other/ProxyAccessible.cpp
@@ -112,10 +112,11 @@ nsStaticAtom* ProxyAccessible::ARIARoleAtom() const {
   return NS_GetStaticAtom(role);
 }
 
-int32_t ProxyAccessible::GetLevelInternal() {
-  int32_t level = 0;
-  Unused << mDoc->SendGetLevelInternal(mID, &level);
-  return level;
+GroupPos ProxyAccessible::GroupPosition() {
+  GroupPos groupPos;
+  Unused << mDoc->SendGroupPosition(mID, &groupPos.level, &groupPos.setSize,
+                                    &groupPos.posInSet);
+  return groupPos;
 }
 
 void ProxyAccessible::ScrollTo(uint32_t aScrollType) {
diff --git a/accessible/mac/mozHTMLAccessible.mm b/accessible/mac/mozHTMLAccessible.mm
index fae1679394ec5..59aeba636ba87 100644
--- a/accessible/mac/mozHTMLAccessible.mm
+++ b/accessible/mac/mozHTMLAccessible.mm
@@ -29,14 +29,14 @@ - (NSString*)title {
 }
 
 - (id)value {
-  uint32_t level = 0;
+  GroupPos groupPos;
   if (AccessibleWrap* accWrap = [self getGeckoAccessible]) {
-    level = accWrap->GetLevelInternal();
+    groupPos = accWrap->GroupPosition();
   } else if (ProxyAccessible* proxy = [self getProxyAccessible]) {
-    level = proxy->GetLevelInternal();
+    groupPos = proxy->GroupPosition();
   }
 
-  return [NSNumber numberWithInt:level];
+  return [NSNumber numberWithInt:groupPos.level];
 }
 
 @end
diff --git a/accessible/xpcom/xpcAccessible.cpp b/accessible/xpcom/xpcAccessible.cpp
index 28129489ac0f9..578ed6047e083 100644
--- a/accessible/xpcom/xpcAccessible.cpp
+++ b/accessible/xpcom/xpcAccessible.cpp
@@ -448,9 +448,12 @@ xpcAccessible::GroupPosition(int32_t* aGroupLevel,
   NS_ENSURE_ARG_POINTER(aPositionInGroup);
   *aPositionInGroup = 0;
 
-  if (!Intl()) return NS_ERROR_FAILURE;
-
-  GroupPos groupPos = Intl()->GroupPosition();
+  GroupPos groupPos;
+  if (Accessible* acc = IntlGeneric().AsAccessible()) {
+    groupPos = acc->GroupPosition();
+  } else {
+    groupPos = IntlGeneric().AsProxy()->GroupPosition();
+  }
 
   *aGroupLevel = groupPos.level;
   *aSimilarItemsInGroup = groupPos.setSize;
diff --git a/ipc/ipdl/sync-messages.ini b/ipc/ipdl/sync-messages.ini
index 799ed6f5bea8a..bbdc7a73b763c 100644
--- a/ipc/ipdl/sync-messages.ini
+++ b/ipc/ipdl/sync-messages.ini
@@ -280,8 +280,8 @@ platform = notwin
 [PDocAccessible::ARIARoleAtom]
 description = Legacy a11y IPC
 platform = notwin
-[PDocAccessible::GetLevelInternal]
-description = Legacy a11y IPC
+[PDocAccessible::GroupPosition]
+description = Legacy a11y IPC. Platform accessibility APIs need to query content synchronously for information.
 platform = notwin
 [PDocAccessible::CaretLineNumber]
 description = Legacy a11y IPC