diff --git a/accessible/windows/ia2/ia2Accessible.cpp b/accessible/windows/ia2/ia2Accessible.cpp
index a557d142bf49..ec17b47e222d 100644
--- a/accessible/windows/ia2/ia2Accessible.cpp
+++ b/accessible/windows/ia2/ia2Accessible.cpp
@@ -73,7 +73,14 @@ ia2Accessible::get_nRelations(long* aNRelations)
   if (acc->IsDefunct())
     return CO_E_OBJNOTCONNECTED;
 
-  MOZ_ASSERT(!acc->IsProxy());
+  if (acc->IsProxy()) {
+    // XXX evaluate performance of collecting all relation targets.
+    nsTArray<RelationType> types;
+    nsTArray<nsTArray<ProxyAccessible*>> targetSets;
+    acc->Proxy()->Relations(&types, &targetSets);
+    *aNRelations = types.Length();
+    return S_OK;
+  }
 
   for (uint32_t idx = 0; idx < ArrayLength(sRelationTypePairs); idx++) {
     if (sRelationTypePairs[idx].second == IA2_RELATION_NULL)
@@ -102,7 +109,33 @@ ia2Accessible::get_relation(long aRelationIndex,
   if (acc->IsDefunct())
     return CO_E_OBJNOTCONNECTED;
 
-  MOZ_ASSERT(!acc->IsProxy());
+  if (acc->IsProxy()) {
+    nsTArray<RelationType> types;
+    nsTArray<nsTArray<ProxyAccessible*>> targetSets;
+    acc->Proxy()->Relations(&types, &targetSets);
+
+    size_t targetSetCount = targetSets.Length();
+    for (size_t i = 0; i < targetSetCount; i++) {
+      uint32_t relTypeIdx = static_cast<uint32_t>(types[i]);
+      MOZ_ASSERT(sRelationTypePairs[relTypeIdx].first == types[i]);
+      if (sRelationTypePairs[relTypeIdx].second == IA2_RELATION_NULL)
+        continue;
+
+      if (static_cast<size_t>(aRelationIndex) == i) {
+        nsTArray<RefPtr<Accessible>> targets;
+        size_t targetCount = targetSets[i].Length();
+        for (size_t j = 0; j < targetCount; j++)
+          targets.AppendElement(WrapperFor(targetSets[i][j]));
+
+        RefPtr<ia2AccessibleRelation> rel =
+          new ia2AccessibleRelation(types[i], Move(targets));
+        rel.forget(aRelation);
+        return S_OK;
+      }
+    }
+
+    return E_INVALIDARG;
+  }
 
   long relIdx = 0;
   for (uint32_t idx = 0; idx < ArrayLength(sRelationTypePairs); idx++) {
@@ -143,7 +176,33 @@ ia2Accessible::get_relations(long aMaxRelations,
   if (acc->IsDefunct())
     return CO_E_OBJNOTCONNECTED;
 
-  MOZ_ASSERT(!acc->IsProxy());
+  if (acc->IsProxy()) {
+    nsTArray<RelationType> types;
+    nsTArray<nsTArray<ProxyAccessible*>> targetSets;
+    acc->Proxy()->Relations(&types, &targetSets);
+
+    size_t count = std::min(targetSets.Length(),
+                            static_cast<size_t>(aMaxRelations));
+    size_t i = 0;
+    while (i < count) {
+      uint32_t relTypeIdx = static_cast<uint32_t>(types[i]);
+      if (sRelationTypePairs[relTypeIdx].second == IA2_RELATION_NULL)
+        continue;
+
+      size_t targetCount = targetSets[i].Length();
+      nsTArray<RefPtr<Accessible>> targets(targetCount);
+      for (size_t j = 0; j < targetCount; j++)
+        targets.AppendElement(WrapperFor(targetSets[i][j]));
+
+      RefPtr<ia2AccessibleRelation> rel =
+        new ia2AccessibleRelation(types[i], Move(targets));
+      rel.forget(aRelation + i);
+      i++;
+    }
+
+    *aNRelations = i;
+    return S_OK;
+  }
 
   for (uint32_t idx = 0; idx < ArrayLength(sRelationTypePairs) &&
        *aNRelations < aMaxRelations; idx++) {
@@ -184,8 +243,10 @@ ia2Accessible::role(long* aRole)
     break;
 
   a11y::role geckoRole;
-  MOZ_ASSERT(!acc->IsProxy());
-  geckoRole = acc->Role();
+  if (acc->IsProxy())
+    geckoRole = acc->Proxy()->Role();
+  else
+    geckoRole = acc->Role();
   switch (geckoRole) {
 #include "RoleMap.h"
     default:
@@ -196,11 +257,16 @@ ia2Accessible::role(long* aRole)
 
   // Special case, if there is a ROLE_ROW inside of a ROLE_TREE_TABLE, then call
   // the IA2 role a ROLE_OUTLINEITEM.
-  MOZ_ASSERT(!acc->IsProxy());
-  if (geckoRole == roles::ROW) {
-    Accessible* xpParent = acc->Parent();
-    if (xpParent && xpParent->Role() == roles::TREE_TABLE)
+  if (acc->IsProxy()) {
+    if (geckoRole == roles::ROW && acc->Proxy()->Parent() &&
+        acc->Proxy()->Parent()->Role() == roles::TREE_TABLE)
       *aRole = ROLE_SYSTEM_OUTLINEITEM;
+  } else {
+    if (geckoRole == roles::ROW) {
+      Accessible* xpParent = acc->Parent();
+      if (xpParent && xpParent->Role() == roles::TREE_TABLE)
+        *aRole = ROLE_SYSTEM_OUTLINEITEM;
+    }
   }
 
   return S_OK;
@@ -217,9 +283,12 @@ ia2Accessible::scrollTo(enum IA2ScrollType aScrollType)
   if (acc->IsDefunct())
     return CO_E_OBJNOTCONNECTED;
 
-  MOZ_ASSERT(!acc->IsProxy());
-  nsCoreUtils::ScrollTo(acc->Document()->PresShell(), acc->GetContent(),
-                        aScrollType);
+  if (acc->IsProxy()) {
+    acc->Proxy()->ScrollTo(aScrollType);
+  } else {
+    nsCoreUtils::ScrollTo(acc->Document()->PresShell(), acc->GetContent(),
+                          aScrollType);
+  }
 
   return S_OK;
 
@@ -240,8 +309,11 @@ ia2Accessible::scrollToPoint(enum IA2CoordinateType aCoordType,
     nsIAccessibleCoordinateType::COORDTYPE_SCREEN_RELATIVE :
     nsIAccessibleCoordinateType::COORDTYPE_PARENT_RELATIVE;
 
-  MOZ_ASSERT(!acc->IsProxy());
-  acc->ScrollToPoint(geckoCoordType, aX, aY);
+  if (acc->IsProxy()) {
+    acc->Proxy()->ScrollToPoint(geckoCoordType, aX, aY);
+  } else {
+    acc->ScrollToPoint(geckoCoordType, aX, aY);
+  }
 
   return S_OK;
 
@@ -301,8 +373,10 @@ ia2Accessible::get_states(AccessibleStates* aStates)
   }
 
   uint64_t state;
-  MOZ_ASSERT(!acc->IsProxy());
-  state = acc->State();
+  if (acc->IsProxy())
+    state = acc->Proxy()->State();
+  else
+    state = acc->State();
 
   if (state & states::INVALID)
     *aStates |= IA2_STATE_INVALID_ENTRY;
@@ -474,8 +548,10 @@ ia2Accessible::get_indexInParent(long* aIndexInParent)
   if (acc->IsDefunct())
     return CO_E_OBJNOTCONNECTED;
 
-  MOZ_ASSERT(!acc->IsProxy());
-  *aIndexInParent = acc->IndexInParent();
+  if (acc->IsProxy())
+    *aIndexInParent = acc->Proxy()->IndexInParent();
+  else
+    *aIndexInParent = acc->IndexInParent();
 
   if (*aIndexInParent == -1)
     return S_FALSE;
@@ -556,8 +632,9 @@ ia2Accessible::get_attributes(BSTR* aAttributes)
     return ConvertToIA2Attributes(attributes, aAttributes);
   }
 
-  MOZ_ASSERT(!acc->IsProxy());
-  return E_UNEXPECTED;
+  nsTArray<Attribute> attrs;
+  acc->Proxy()->Attributes(&attrs);
+  return ConvertToIA2Attributes(&attrs, aAttributes);
 
   A11Y_TRYBLOCK_END
 }
@@ -642,12 +719,21 @@ ia2Accessible::get_relationTargetsOfType(BSTR aType,
     return CO_E_OBJNOTCONNECTED;
 
   nsTArray<Accessible*> targets;
-  MOZ_ASSERT(!acc->IsProxy());
-  Relation rel = acc->RelationByType(*relationType);
-  Accessible* target = nullptr;
-  while ((target = rel.Next()) &&
-         static_cast<long>(targets.Length()) <= aMaxTargets) {
-    targets.AppendElement(target);
+  if (acc->IsProxy()) {
+    nsTArray<ProxyAccessible*> targetProxies =
+      acc->Proxy()->RelationByType(*relationType);
+
+    size_t targetCount = aMaxTargets;
+    if (targetProxies.Length() < targetCount)
+      targetCount = targetProxies.Length();
+    for (size_t i = 0; i < targetCount; i++)
+      targets.AppendElement(WrapperFor(targetProxies[i]));
+  } else {
+    Relation rel = acc->RelationByType(*relationType);
+    Accessible* target = nullptr;
+    while ((target = rel.Next()) &&
+           static_cast<long>(targets.Length()) <= aMaxTargets)
+      targets.AppendElement(target);
   }
 
   *aNTargets = targets.Length();
diff --git a/accessible/windows/ia2/ia2AccessibleEditableText.cpp b/accessible/windows/ia2/ia2AccessibleEditableText.cpp
index 361d6a13060f..4685a2df9756 100644
--- a/accessible/windows/ia2/ia2AccessibleEditableText.cpp
+++ b/accessible/windows/ia2/ia2AccessibleEditableText.cpp
@@ -24,7 +24,9 @@ ia2AccessibleEditableText::copyText(long aStartOffset, long aEndOffset)
 {
   A11Y_TRYBLOCK_BEGIN
 
-  MOZ_ASSERT(!HyperTextProxyFor(this));
+  if (ProxyAccessible* proxy = HyperTextProxyFor(this)) {
+    return proxy->CopyText(aStartOffset, aEndOffset) ? S_OK : E_INVALIDARG;
+  }
 
   HyperTextAccessible* textAcc = static_cast<HyperTextAccessibleWrap*>(this);
   if (textAcc->IsDefunct())
@@ -44,7 +46,9 @@ ia2AccessibleEditableText::deleteText(long aStartOffset, long aEndOffset)
 {
   A11Y_TRYBLOCK_BEGIN
 
-  MOZ_ASSERT(!HyperTextProxyFor(this));
+    if (ProxyAccessible* proxy = HyperTextProxyFor(this)) {
+      return proxy->DeleteText(aStartOffset, aEndOffset) ? S_OK : E_INVALIDARG;
+    }
 
   HyperTextAccessible* textAcc = static_cast<HyperTextAccessibleWrap*>(this);
   if (textAcc->IsDefunct())
@@ -66,7 +70,9 @@ ia2AccessibleEditableText::insertText(long aOffset, BSTR *aText)
 
   uint32_t length = ::SysStringLen(*aText);
   nsAutoString text(*aText, length);
-  MOZ_ASSERT(!HyperTextProxyFor(this));
+  if (ProxyAccessible* proxy = HyperTextProxyFor(this)) {
+    return proxy->InsertText(text, aOffset) ? S_OK : E_INVALIDARG;
+  }
 
   HyperTextAccessible* textAcc = static_cast<HyperTextAccessibleWrap*>(this);
   if (textAcc->IsDefunct())
@@ -86,7 +92,9 @@ ia2AccessibleEditableText::cutText(long aStartOffset, long aEndOffset)
 {
   A11Y_TRYBLOCK_BEGIN
 
-  MOZ_ASSERT(!HyperTextProxyFor(this));
+  if (ProxyAccessible* proxy = HyperTextProxyFor(this)) {
+    return proxy->CutText(aStartOffset, aEndOffset) ? S_OK : E_INVALIDARG;
+  }
 
   HyperTextAccessible* textAcc = static_cast<HyperTextAccessibleWrap*>(this);
   if (textAcc->IsDefunct())
@@ -106,7 +114,9 @@ ia2AccessibleEditableText::pasteText(long aOffset)
 {
   A11Y_TRYBLOCK_BEGIN
 
-  MOZ_ASSERT(!HyperTextProxyFor(this));
+  if (ProxyAccessible* proxy = HyperTextProxyFor(this)) {
+    return proxy->PasteText(aOffset) ? S_OK : E_INVALIDARG;
+  }
 
   HyperTextAccessible* textAcc = static_cast<HyperTextAccessibleWrap*>(this);
   if (textAcc->IsDefunct())
diff --git a/accessible/windows/ia2/ia2AccessibleHyperlink.cpp b/accessible/windows/ia2/ia2AccessibleHyperlink.cpp
index d1c577f1df9a..2b829e019579 100644
--- a/accessible/windows/ia2/ia2AccessibleHyperlink.cpp
+++ b/accessible/windows/ia2/ia2AccessibleHyperlink.cpp
@@ -53,7 +53,17 @@ ia2AccessibleHyperlink::get_anchor(long aIndex, VARIANT* aAnchor)
   VariantInit(aAnchor);
 
   Accessible* thisObj = static_cast<AccessibleWrap*>(this);
-  MOZ_ASSERT(!thisObj->IsProxy());
+  if (thisObj->IsProxy()) {
+    ProxyAccessible* anchor = thisObj->Proxy()->AnchorAt(aIndex);
+    if (!anchor)
+      return S_FALSE;
+
+    IUnknown* tmp = static_cast<IAccessibleHyperlink*>(WrapperFor(anchor));
+    tmp->AddRef();
+    aAnchor->punkVal = tmp;
+    aAnchor->vt = VT_UNKNOWN;
+    return S_OK;
+  }
 
   if (thisObj->IsDefunct())
     return CO_E_OBJNOTCONNECTED;
@@ -87,35 +97,36 @@ ia2AccessibleHyperlink::get_anchorTarget(long aIndex, VARIANT* aAnchorTarget)
 {
   A11Y_TRYBLOCK_BEGIN
 
-  if (!aAnchorTarget) {
+  if (!aAnchorTarget)
     return E_INVALIDARG;
-  }
 
   VariantInit(aAnchorTarget);
 
   Accessible* thisObj = static_cast<AccessibleWrap*>(this);
   nsAutoCString uriStr;
-  MOZ_ASSERT(!thisObj->IsProxy());
-  if (thisObj->IsDefunct()) {
-    return CO_E_OBJNOTCONNECTED;
-  }
+  if (thisObj->IsProxy()) {
+    bool ok;
+    thisObj->Proxy()->AnchorURIAt(aIndex, uriStr, &ok);
+    if (!ok)
+      return S_FALSE;
 
-  if (aIndex < 0 || aIndex >= static_cast<long>(thisObj->AnchorCount())) {
-    return E_INVALIDARG;
-  }
+  } else {
+    if (thisObj->IsDefunct())
+      return CO_E_OBJNOTCONNECTED;
 
-  if (!thisObj->IsLink()) {
-    return S_FALSE;
-  }
+    if (aIndex < 0 || aIndex >= static_cast<long>(thisObj->AnchorCount()))
+      return E_INVALIDARG;
 
-  nsCOMPtr<nsIURI> uri = thisObj->AnchorURIAt(aIndex);
-  if (!uri) {
-    return S_FALSE;
-  }
+    if (!thisObj->IsLink())
+      return S_FALSE;
 
-  nsresult rv = uri->GetSpec(uriStr);
-  if (NS_FAILED(rv)) {
-    return GetHRESULT(rv);
+    nsCOMPtr<nsIURI> uri = thisObj->AnchorURIAt(aIndex);
+    if (!uri)
+      return S_FALSE;
+
+    nsresult rv = uri->GetSpec(uriStr);
+    if (NS_FAILED(rv))
+      return GetHRESULT(rv);
   }
 
   nsAutoString stringURI;
@@ -139,7 +150,11 @@ ia2AccessibleHyperlink::get_startIndex(long* aIndex)
 
   *aIndex = 0;
 
-  MOZ_ASSERT(!HyperTextProxyFor(this));
+  if (ProxyAccessible* proxy = HyperTextProxyFor(this)) {
+    bool valid;
+    *aIndex = proxy->StartOffset(&valid);
+    return valid ? S_OK : S_FALSE;
+  }
 
   Accessible* thisObj = static_cast<AccessibleWrap*>(this);
   if (thisObj->IsDefunct())
@@ -164,7 +179,11 @@ ia2AccessibleHyperlink::get_endIndex(long* aIndex)
 
   *aIndex = 0;
 
-  MOZ_ASSERT(!HyperTextProxyFor(this));
+  if (ProxyAccessible* proxy = HyperTextProxyFor(this)) {
+    bool valid;
+    *aIndex = proxy->EndOffset(&valid);
+    return valid ? S_OK : S_FALSE;
+  }
 
   Accessible* thisObj = static_cast<AccessibleWrap*>(this);
   if (thisObj->IsDefunct())
@@ -189,7 +208,10 @@ ia2AccessibleHyperlink::get_valid(boolean* aValid)
 
   *aValid = false;
 
-  MOZ_ASSERT(!HyperTextProxyFor(this));
+  if (ProxyAccessible* proxy = HyperTextProxyFor(this)) {
+    *aValid = proxy->IsLinkValid();
+    return S_OK;
+  }
 
   Accessible* thisObj = static_cast<AccessibleWrap*>(this);
   if (thisObj->IsDefunct())
diff --git a/accessible/windows/ia2/ia2AccessibleHypertext.cpp b/accessible/windows/ia2/ia2AccessibleHypertext.cpp
index f4b3bdaf25a6..906b76d4e796 100644
--- a/accessible/windows/ia2/ia2AccessibleHypertext.cpp
+++ b/accessible/windows/ia2/ia2AccessibleHypertext.cpp
@@ -26,7 +26,10 @@ ia2AccessibleHypertext::get_nHyperlinks(long* aHyperlinkCount)
 
   *aHyperlinkCount = 0;
 
-  MOZ_ASSERT(!HyperTextProxyFor(this));
+  if (ProxyAccessible* proxy = HyperTextProxyFor(this)) {
+    *aHyperlinkCount = proxy->LinkCount();
+    return S_OK;
+  }
 
   HyperTextAccessibleWrap* hyperText = static_cast<HyperTextAccessibleWrap*>(this);
   if (hyperText->IsDefunct())
@@ -50,13 +53,19 @@ ia2AccessibleHypertext::get_hyperlink(long aLinkIndex,
   *aHyperlink = nullptr;
 
   AccessibleWrap* hyperLink;
-  MOZ_ASSERT(!HyperTextProxyFor(this));
-  HyperTextAccessibleWrap* hyperText = static_cast<HyperTextAccessibleWrap*>(this);
-  if (hyperText->IsDefunct()) {
-    return CO_E_OBJNOTCONNECTED;
-  }
+  if (ProxyAccessible* proxy = HyperTextProxyFor(this)) {
+    ProxyAccessible* link = proxy->LinkAt(aLinkIndex);
+    if (!link)
+      return E_FAIL;
 
-  hyperLink = static_cast<AccessibleWrap*>(hyperText->LinkAt(aLinkIndex));
+    hyperLink = WrapperFor(link);
+  } else {
+    HyperTextAccessibleWrap* hyperText = static_cast<HyperTextAccessibleWrap*>(this);
+    if (hyperText->IsDefunct())
+      return CO_E_OBJNOTCONNECTED;
+
+    hyperLink = static_cast<AccessibleWrap*>(hyperText->LinkAt(aLinkIndex));
+  }
 
   if (!hyperLink)
     return E_FAIL;
@@ -79,7 +88,10 @@ ia2AccessibleHypertext::get_hyperlinkIndex(long aCharIndex, long* aHyperlinkInde
 
   *aHyperlinkIndex = 0;
 
-  MOZ_ASSERT(!HyperTextProxyFor(this));
+  if (ProxyAccessible* proxy = HyperTextProxyFor(this)) {
+    *aHyperlinkIndex = proxy->LinkIndexAtOffset(aCharIndex);
+    return S_OK;
+  }
 
   HyperTextAccessibleWrap* hyperAcc = static_cast<HyperTextAccessibleWrap*>(this);
   if (hyperAcc->IsDefunct())
diff --git a/accessible/windows/ia2/ia2AccessibleText.cpp b/accessible/windows/ia2/ia2AccessibleText.cpp
index 7ac766f300ba..7f79b110cc4e 100644
--- a/accessible/windows/ia2/ia2AccessibleText.cpp
+++ b/accessible/windows/ia2/ia2AccessibleText.cpp
@@ -30,7 +30,10 @@ ia2AccessibleText::addSelection(long aStartOffset, long aEndOffset)
 {
   A11Y_TRYBLOCK_BEGIN
 
-  MOZ_ASSERT(!HyperTextProxyFor(this));
+  if (ProxyAccessible* proxy = HyperTextProxyFor(this)) {
+    return proxy->AddToSelection(aStartOffset, aEndOffset) ?
+      S_OK : E_INVALIDARG;
+  }
 
   HyperTextAccessible* textAcc = static_cast<HyperTextAccessibleWrap*>(this);
   if (textAcc->IsDefunct())
@@ -57,16 +60,21 @@ ia2AccessibleText::get_attributes(long aOffset, long *aStartOffset,
 
   int32_t startOffset = 0, endOffset = 0;
   HRESULT hr;
-  MOZ_ASSERT(!HyperTextProxyFor(this));
-  HyperTextAccessible* textAcc = static_cast<HyperTextAccessibleWrap*>(this);
-  if (textAcc->IsDefunct()) {
-    return CO_E_OBJNOTCONNECTED;
+  if (ProxyAccessible* proxy = HyperTextProxyFor(this)) {
+    AutoTArray<Attribute, 10> attrs;
+    proxy->TextAttributes(true, aOffset, &attrs, &startOffset, &endOffset);
+    hr = AccessibleWrap::ConvertToIA2Attributes(&attrs, aTextAttributes);
+  } else {
+    HyperTextAccessible* textAcc = static_cast<HyperTextAccessibleWrap*>(this);
+    if (textAcc->IsDefunct())
+      return CO_E_OBJNOTCONNECTED;
+
+    nsCOMPtr<nsIPersistentProperties> attributes =
+      textAcc->TextAttributes(true, aOffset, &startOffset, &endOffset);
+
+    hr = AccessibleWrap::ConvertToIA2Attributes(attributes, aTextAttributes);
   }
 
-  nsCOMPtr<nsIPersistentProperties> attributes =
-    textAcc->TextAttributes(true, aOffset, &startOffset, &endOffset);
-
-  hr = AccessibleWrap::ConvertToIA2Attributes(attributes, aTextAttributes);
   if (FAILED(hr))
     return hr;
 
@@ -88,13 +96,15 @@ ia2AccessibleText::get_caretOffset(long *aOffset)
 
   *aOffset = -1;
 
-  MOZ_ASSERT(!HyperTextProxyFor(this));
-  HyperTextAccessible* textAcc = static_cast<HyperTextAccessibleWrap*>(this);
-  if (textAcc->IsDefunct()) {
-    return CO_E_OBJNOTCONNECTED;
-  }
+  if (ProxyAccessible* proxy = HyperTextProxyFor(this)) {
+    *aOffset = proxy->CaretOffset();
+  } else {
+    HyperTextAccessible* textAcc = static_cast<HyperTextAccessibleWrap*>(this);
+    if (textAcc->IsDefunct())
+      return CO_E_OBJNOTCONNECTED;
 
-  *aOffset = textAcc->CaretOffset();
+    *aOffset = textAcc->CaretOffset();
+  }
 
   return *aOffset != -1 ? S_OK : S_FALSE;
 
@@ -117,12 +127,15 @@ ia2AccessibleText::get_characterExtents(long aOffset,
     nsIAccessibleCoordinateType::COORDTYPE_SCREEN_RELATIVE :
     nsIAccessibleCoordinateType::COORDTYPE_PARENT_RELATIVE;
   nsIntRect rect;
-  MOZ_ASSERT(!HyperTextProxyFor(this));
-  HyperTextAccessible* textAcc = static_cast<HyperTextAccessibleWrap*>(this);
-  if (textAcc->IsDefunct())
-    return CO_E_OBJNOTCONNECTED;
+  if (ProxyAccessible* proxy = HyperTextProxyFor(this)) {
+    rect = proxy->CharBounds(aOffset, geckoCoordType);
+  } else {
+    HyperTextAccessible* textAcc = static_cast<HyperTextAccessibleWrap*>(this);
+    if (textAcc->IsDefunct())
+      return CO_E_OBJNOTCONNECTED;
 
-  rect = textAcc->CharBounds(aOffset, geckoCoordType);
+    rect = textAcc->CharBounds(aOffset, geckoCoordType);
+  }
 
   *aX = rect.x;
   *aY = rect.y;
@@ -142,13 +155,15 @@ ia2AccessibleText::get_nSelections(long* aNSelections)
     return E_INVALIDARG;
   *aNSelections = 0;
 
-  MOZ_ASSERT(!HyperTextProxyFor(this));
-  HyperTextAccessible* textAcc = static_cast<HyperTextAccessibleWrap*>(this);
-  if (textAcc->IsDefunct()) {
-    return CO_E_OBJNOTCONNECTED;
-  }
+  if (ProxyAccessible* proxy = HyperTextProxyFor(this)) {
+    *aNSelections = proxy->SelectionCount();
+  } else {
+    HyperTextAccessible* textAcc = static_cast<HyperTextAccessibleWrap*>(this);
+    if (textAcc->IsDefunct())
+      return CO_E_OBJNOTCONNECTED;
 
-  *aNSelections = textAcc->SelectionCount();
+    *aNSelections = textAcc->SelectionCount();
+  }
 
   return S_OK;
 
@@ -170,13 +185,15 @@ ia2AccessibleText::get_offsetAtPoint(long aX, long aY,
     nsIAccessibleCoordinateType::COORDTYPE_SCREEN_RELATIVE :
     nsIAccessibleCoordinateType::COORDTYPE_PARENT_RELATIVE;
 
-  MOZ_ASSERT(!HyperTextProxyFor(this));
-  HyperTextAccessible* textAcc = static_cast<HyperTextAccessibleWrap*>(this);
-  if (textAcc->IsDefunct()) {
-    return CO_E_OBJNOTCONNECTED;
-  }
+  if (ProxyAccessible* proxy = HyperTextProxyFor(this)) {
+    *aOffset = proxy->OffsetAtPoint(aX, aY, geckoCoordType);
+  } else {
+    HyperTextAccessible* textAcc = static_cast<HyperTextAccessibleWrap*>(this);
+    if (textAcc->IsDefunct())
+      return CO_E_OBJNOTCONNECTED;
 
-  *aOffset = textAcc->OffsetAtPoint(aX, aY, geckoCoordType);
+    *aOffset = textAcc->OffsetAtPoint(aX, aY, geckoCoordType);
+  }
 
   return *aOffset == -1 ? S_FALSE : S_OK;
 
@@ -194,14 +211,18 @@ ia2AccessibleText::get_selection(long aSelectionIndex, long* aStartOffset,
   *aStartOffset = *aEndOffset = 0;
 
   int32_t startOffset = 0, endOffset = 0;
-  MOZ_ASSERT(!HyperTextProxyFor(this));
-  HyperTextAccessible* textAcc = static_cast<HyperTextAccessibleWrap*>(this);
-  if (textAcc->IsDefunct()) {
-    return CO_E_OBJNOTCONNECTED;
-  }
+  if (ProxyAccessible* proxy = HyperTextProxyFor(this)) {
+    nsString unused;
+    if (!proxy->SelectionBoundsAt(aSelectionIndex, unused, &startOffset,
+                                  &endOffset))
+      return E_INVALIDARG;
+  } else {
+    HyperTextAccessible* textAcc = static_cast<HyperTextAccessibleWrap*>(this);
+    if (textAcc->IsDefunct())
+      return CO_E_OBJNOTCONNECTED;
 
-  if (!textAcc->SelectionBoundsAt(aSelectionIndex, &startOffset, &endOffset)) {
-    return E_INVALIDARG;
+    if (!textAcc->SelectionBoundsAt(aSelectionIndex, &startOffset, &endOffset))
+      return E_INVALIDARG;
   }
 
   *aStartOffset = startOffset;
@@ -222,17 +243,20 @@ ia2AccessibleText::get_text(long aStartOffset, long aEndOffset, BSTR* aText)
   *aText = nullptr;
 
   nsAutoString text;
-  MOZ_ASSERT(!HyperTextProxyFor(this));
-  HyperTextAccessible* textAcc = static_cast<HyperTextAccessibleWrap*>(this);
-  if (textAcc->IsDefunct()) {
-    return CO_E_OBJNOTCONNECTED;
-  }
+  if (ProxyAccessible* proxy = HyperTextProxyFor(this)) {
+    if (!proxy->TextSubstring(aStartOffset, aEndOffset, text)) {
+      return E_INVALIDARG;
+    }
+  } else {
+    HyperTextAccessible* textAcc = static_cast<HyperTextAccessibleWrap*>(this);
+    if (textAcc->IsDefunct())
+      return CO_E_OBJNOTCONNECTED;
 
-  if (!textAcc->IsValidRange(aStartOffset, aEndOffset)) {
-    return E_INVALIDARG;
-  }
+    if (!textAcc->IsValidRange(aStartOffset, aEndOffset))
+      return E_INVALIDARG;
 
-  textAcc->TextSubstring(aStartOffset, aEndOffset, text);
+    textAcc->TextSubstring(aStartOffset, aEndOffset, text);
+  }
 
   if (text.IsEmpty())
     return S_FALSE;
@@ -390,7 +414,9 @@ ia2AccessibleText::removeSelection(long aSelectionIndex)
 {
   A11Y_TRYBLOCK_BEGIN
 
-  MOZ_ASSERT(!HyperTextProxyFor(this));
+    if (ProxyAccessible* proxy = HyperTextProxyFor(this)) {
+      return proxy->RemoveFromSelection(aSelectionIndex) ? S_OK : E_INVALIDARG;
+    }
 
   HyperTextAccessible* textAcc = static_cast<HyperTextAccessibleWrap*>(this);
   if (textAcc->IsDefunct())
@@ -407,7 +433,10 @@ ia2AccessibleText::setCaretOffset(long aOffset)
 {
   A11Y_TRYBLOCK_BEGIN
 
-  MOZ_ASSERT(!HyperTextProxyFor(this));
+    if (ProxyAccessible* proxy = HyperTextProxyFor(this)) {
+      proxy->SetCaretOffset(aOffset);
+      return S_OK;
+    }
 
   HyperTextAccessible* textAcc = static_cast<HyperTextAccessibleWrap*>(this);
   if (textAcc->IsDefunct())
@@ -428,7 +457,10 @@ ia2AccessibleText::setSelection(long aSelectionIndex, long aStartOffset,
 {
   A11Y_TRYBLOCK_BEGIN
 
-  MOZ_ASSERT(!HyperTextProxyFor(this));
+  if (ProxyAccessible* proxy = HyperTextProxyFor(this)) {
+    return proxy->SetSelectionBoundsAt(aSelectionIndex, aStartOffset,
+                                       aEndOffset) ? S_OK : E_INVALIDARG;
+  }
 
   HyperTextAccessible* textAcc = static_cast<HyperTextAccessibleWrap*>(this);
   if (textAcc->IsDefunct())
@@ -449,7 +481,10 @@ ia2AccessibleText::get_nCharacters(long* aNCharacters)
     return E_INVALIDARG;
   *aNCharacters = 0;
 
-  MOZ_ASSERT(!HyperTextProxyFor(this));
+  if (ProxyAccessible* proxy = HyperTextProxyFor(this)) {
+    *aNCharacters = proxy->CharacterCount();
+    return S_OK;
+  }
 
   HyperTextAccessible* textAcc = static_cast<HyperTextAccessibleWrap*>(this);
   if (textAcc->IsDefunct())
@@ -467,7 +502,10 @@ ia2AccessibleText::scrollSubstringTo(long aStartIndex, long aEndIndex,
 {
   A11Y_TRYBLOCK_BEGIN
 
-  MOZ_ASSERT(!HyperTextProxyFor(this));
+    if (ProxyAccessible* proxy = HyperTextProxyFor(this)) {
+      proxy->ScrollSubstringTo(aStartIndex, aEndIndex, aScrollType);
+      return S_OK;
+    }
 
   HyperTextAccessible* textAcc = static_cast<HyperTextAccessibleWrap*>(this);
   if (textAcc->IsDefunct())
@@ -493,7 +531,11 @@ ia2AccessibleText::scrollSubstringToPoint(long aStartIndex, long aEndIndex,
     nsIAccessibleCoordinateType::COORDTYPE_SCREEN_RELATIVE :
     nsIAccessibleCoordinateType::COORDTYPE_PARENT_RELATIVE;
 
-  MOZ_ASSERT(!HyperTextProxyFor(this));
+  if (ProxyAccessible* proxy = HyperTextProxyFor(this)) {
+    proxy->ScrollSubstringToPoint(aStartIndex, aEndIndex, geckoCoordType, aX,
+                                  aY);
+    return S_OK;
+  }
 
   HyperTextAccessible* textAcc = static_cast<HyperTextAccessibleWrap*>(this);
   if (textAcc->IsDefunct())
diff --git a/accessible/windows/ia2/ia2AccessibleValue.cpp b/accessible/windows/ia2/ia2AccessibleValue.cpp
index e33442295651..b78d206bc07f 100644
--- a/accessible/windows/ia2/ia2AccessibleValue.cpp
+++ b/accessible/windows/ia2/ia2AccessibleValue.cpp
@@ -55,12 +55,14 @@ ia2AccessibleValue::get_currentValue(VARIANT* aCurrentValue)
 
   AccessibleWrap* valueAcc = static_cast<AccessibleWrap*>(this);
   double currentValue;
-  MOZ_ASSERT(!valueAcc->IsProxy());
-  if (valueAcc->IsDefunct()) {
-    return CO_E_OBJNOTCONNECTED;
-  }
+  if (valueAcc->IsProxy()) {
+    currentValue = valueAcc->Proxy()->CurValue();
+  } else {
+    if (valueAcc->IsDefunct())
+      return CO_E_OBJNOTCONNECTED;
 
-  currentValue = valueAcc->CurValue();
+    currentValue = valueAcc->CurValue();
+  }
 
   if (IsNaN(currentValue))
     return S_FALSE;
@@ -81,7 +83,8 @@ ia2AccessibleValue::setCurrentValue(VARIANT aValue)
     return E_INVALIDARG;
 
   AccessibleWrap* valueAcc = static_cast<AccessibleWrap*>(this);
-  MOZ_ASSERT(!valueAcc->IsProxy());
+  if (valueAcc->IsProxy())
+    return valueAcc->Proxy()->SetCurValue(aValue.dblVal) ? S_OK : E_FAIL;
 
   if (valueAcc->IsDefunct())
     return CO_E_OBJNOTCONNECTED;
@@ -103,12 +106,14 @@ ia2AccessibleValue::get_maximumValue(VARIANT* aMaximumValue)
 
   AccessibleWrap* valueAcc = static_cast<AccessibleWrap*>(this);
   double maximumValue;
-  MOZ_ASSERT(!valueAcc->IsProxy());
-  if (valueAcc->IsDefunct()) {
-    return CO_E_OBJNOTCONNECTED;
-  }
+  if (valueAcc->IsProxy()) {
+    maximumValue = valueAcc->Proxy()->MaxValue();
+  } else {
+    if (valueAcc->IsDefunct())
+      return CO_E_OBJNOTCONNECTED;
 
-  maximumValue = valueAcc->MaxValue();
+    maximumValue = valueAcc->MaxValue();
+  }
 
   if (IsNaN(maximumValue))
     return S_FALSE;
@@ -132,12 +137,14 @@ ia2AccessibleValue::get_minimumValue(VARIANT* aMinimumValue)
 
   AccessibleWrap* valueAcc = static_cast<AccessibleWrap*>(this);
   double minimumValue;
-  MOZ_ASSERT(!valueAcc->IsProxy());
-  if (valueAcc->IsDefunct()) {
-    return CO_E_OBJNOTCONNECTED;
-  }
+  if (valueAcc->IsProxy()) {
+    minimumValue = valueAcc->Proxy()->MinValue();
+  } else {
+    if (valueAcc->IsDefunct())
+      return CO_E_OBJNOTCONNECTED;
 
-  minimumValue = valueAcc->MinValue();
+    minimumValue = valueAcc->MinValue();
+  }
 
   if (IsNaN(minimumValue))
     return S_FALSE;
diff --git a/accessible/windows/msaa/AccessibleWrap.cpp b/accessible/windows/msaa/AccessibleWrap.cpp
index ad23d1a56838..064eef0ac6fb 100644
--- a/accessible/windows/msaa/AccessibleWrap.cpp
+++ b/accessible/windows/msaa/AccessibleWrap.cpp
@@ -187,6 +187,16 @@ AccessibleWrap::get_accParent( IDispatch __RPC_FAR *__RPC_FAR *ppdispParent)
   if (IsDefunct())
     return CO_E_OBJNOTCONNECTED;
 
+  if (IsProxy()) {
+    ProxyAccessible* proxy = Proxy();
+    ProxyAccessible* parent = proxy->Parent();
+    if (!parent)
+      return S_FALSE;
+
+    *ppdispParent = NativeAccessible(WrapperFor(parent));
+    return S_OK;
+  }
+
   DocAccessible* doc = AsDoc();
   if (doc) {
     // Return window system accessible object for root document and tab document
@@ -226,6 +236,15 @@ AccessibleWrap::get_accChildCount( long __RPC_FAR *pcountChildren)
   if (IsDefunct())
     return CO_E_OBJNOTCONNECTED;
 
+  if (IsProxy()) {
+    ProxyAccessible* proxy = Proxy();
+    if (proxy->MustPruneChildren())
+      return S_OK;
+
+    *pcountChildren = proxy->ChildrenCount();
+    return S_OK;
+  }
+
   if (nsAccUtils::MustPrune(this))
     return S_OK;
 
@@ -290,7 +309,10 @@ AccessibleWrap::get_accName(
     return CO_E_OBJNOTCONNECTED;
 
   nsAutoString name;
-  xpAccessible->Name(name);
+  if (xpAccessible->IsProxy())
+    xpAccessible->Proxy()->Name(name);
+  else
+    xpAccessible->Name(name);
 
   // The name was not provided, e.g. no alt attribute for an image. A screen
   // reader may choose to invent its own accessible name, e.g. from an image src
@@ -329,6 +351,10 @@ AccessibleWrap::get_accValue(
   if (xpAccessible->IsDefunct())
     return CO_E_OBJNOTCONNECTED;
 
+  // TODO make this work with proxies.
+  if (IsProxy())
+    return E_NOTIMPL;
+
   nsAutoString value;
   xpAccessible->Value(value);
 
@@ -368,7 +394,10 @@ AccessibleWrap::get_accDescription(VARIANT varChild,
     return CO_E_OBJNOTCONNECTED;
 
   nsAutoString description;
-  xpAccessible->Description(description);
+  if (IsProxy())
+    xpAccessible->Proxy()->Description(description);
+  else
+    xpAccessible->Description(description);
 
   *pszDescription = ::SysAllocStringLen(description.get(),
                                         description.Length());
@@ -400,12 +429,16 @@ AccessibleWrap::get_accRole(
     return CO_E_OBJNOTCONNECTED;
 
   a11y::role geckoRole;
+  if (xpAccessible->IsProxy()) {
+    geckoRole = xpAccessible->Proxy()->Role();
+  } else {
 #ifdef DEBUG
-  NS_ASSERTION(nsAccUtils::IsTextInterfaceSupportCorrect(xpAccessible),
-               "Does not support Text when it should");
+    NS_ASSERTION(nsAccUtils::IsTextInterfaceSupportCorrect(xpAccessible),
+                 "Does not support Text when it should");
 #endif
 
-  geckoRole = xpAccessible->Role();
+    geckoRole = xpAccessible->Role();
+  }
 
   uint32_t msaaRole = 0;
 
@@ -426,12 +459,18 @@ AccessibleWrap::get_accRole(
   // Special case, if there is a ROLE_ROW inside of a ROLE_TREE_TABLE, then call the MSAA role
   // a ROLE_OUTLINEITEM for consistency and compatibility.
   // We need this because ARIA has a role of "row" for both grid and treegrid
-  if (geckoRole == roles::ROW) {
-    Accessible* xpParent = Parent();
-    if (xpParent && xpParent->Role() == roles::TREE_TABLE)
-      msaaRole = ROLE_SYSTEM_OUTLINEITEM;
+  if (xpAccessible->IsProxy()) {
+      if (geckoRole == roles::ROW
+          && xpAccessible->Proxy()->Parent()->Role() == roles::TREE_TABLE)
+        msaaRole = ROLE_SYSTEM_OUTLINEITEM;
+  } else {
+    if (geckoRole == roles::ROW) {
+      Accessible* xpParent = Parent();
+      if (xpParent && xpParent->Role() == roles::TREE_TABLE)
+        msaaRole = ROLE_SYSTEM_OUTLINEITEM;
+    }
   }
-
+  
   // -- Try enumerated role
   if (msaaRole != USE_ROLE_STRING) {
     pvarRole->vt = VT_I4;
@@ -439,6 +478,10 @@ AccessibleWrap::get_accRole(
     return S_OK;
   }
 
+  // XXX bug 798492 make this work with proxies?
+  if (IsProxy())
+  return E_FAIL;
+
   // -- Try BSTR role
   // Could not map to known enumerated MSAA role like ROLE_BUTTON
   // Use BSTR role to expose role attribute or tag name + namespace
@@ -509,7 +552,11 @@ AccessibleWrap::get_accState(
   //   INVALID -> ALERT_HIGH
   //   CHECKABLE -> MARQUEED
 
-  uint64_t state = State();
+  uint64_t state;
+  if (xpAccessible->IsProxy())
+    state = xpAccessible->Proxy()->State();
+  else
+    state = State();
 
   uint32_t msaaState = 0;
   nsAccUtils::To32States(state, &msaaState, nullptr);
@@ -575,6 +622,10 @@ AccessibleWrap::get_accKeyboardShortcut(
   if (acc->IsDefunct())
     return CO_E_OBJNOTCONNECTED;
 
+  // TODO make this work with proxies.
+  if (acc->IsProxy())
+    return E_NOTIMPL;
+
   KeyBinding keyBinding = acc->AccessKey();
   if (keyBinding.IsEmpty())
     keyBinding = acc->KeyboardShortcut();
@@ -610,7 +661,13 @@ AccessibleWrap::get_accFocus(
     return CO_E_OBJNOTCONNECTED;
 
   // Return the current IAccessible child that has focus
-  Accessible* focusedAccessible = FocusedChild();
+  Accessible* focusedAccessible;
+  if (IsProxy()) {
+    ProxyAccessible* proxy = Proxy()->FocusedChild();
+    focusedAccessible = proxy ? WrapperFor(proxy) : nullptr;
+  } else {
+    focusedAccessible = FocusedChild();
+  }
 
   if (focusedAccessible == this) {
     pvarChild->vt = VT_I4;
@@ -772,9 +829,23 @@ AccessibleWrap::get_accSelection(VARIANT __RPC_FAR *pvarChildren)
   if (IsDefunct())
     return CO_E_OBJNOTCONNECTED;
 
+  // TODO make this work with proxies.
+  if (IsProxy())
+    return E_NOTIMPL;
+
   if (IsSelect()) {
     AutoTArray<Accessible*, 10> selectedItems;
-    SelectedItems(&selectedItems);
+    if (IsProxy()) {
+      nsTArray<ProxyAccessible*> proxies;
+      Proxy()->SelectedItems(&proxies);
+
+      uint32_t selectedCount = proxies.Length();
+      for (uint32_t i = 0; i < selectedCount; i++) {
+        selectedItems.AppendElement(WrapperFor(proxies[i]));
+      }
+    } else {
+      SelectedItems(&selectedItems);
+    }
 
     // 1) Create and initialize the enumeration
     RefPtr<AccessibleEnumerator> pEnum = new AccessibleEnumerator(selectedItems);
@@ -809,7 +880,11 @@ AccessibleWrap::get_accDefaultAction(
     return CO_E_OBJNOTCONNECTED;
 
   nsAutoString defaultAction;
-  xpAccessible->ActionNameAt(0, defaultAction);
+  if (xpAccessible->IsProxy()) {
+    xpAccessible->Proxy()->ActionNameAt(0, defaultAction);
+  } else {
+    xpAccessible->ActionNameAt(0, defaultAction);
+  }
 
   *pszDefaultAction = ::SysAllocStringLen(defaultAction.get(),
                                           defaultAction.Length());
@@ -837,22 +912,42 @@ AccessibleWrap::accSelect(
     return CO_E_OBJNOTCONNECTED;
 
   if (flagsSelect & SELFLAG_TAKEFOCUS) {
-    xpAccessible->TakeFocus();
+    if (xpAccessible->IsProxy()) {
+      xpAccessible->Proxy()->TakeFocus();
+    } else {
+      xpAccessible->TakeFocus();
+    }
+
     return S_OK;
   }
 
   if (flagsSelect & SELFLAG_TAKESELECTION) {
-    xpAccessible->TakeSelection();
+    if (xpAccessible->IsProxy()) {
+      xpAccessible->Proxy()->TakeSelection();
+    } else {
+      xpAccessible->TakeSelection();
+    }
+
     return S_OK;
   }
 
   if (flagsSelect & SELFLAG_ADDSELECTION) {
-    xpAccessible->SetSelected(true);
+    if (xpAccessible->IsProxy()) {
+      xpAccessible->Proxy()->SetSelected(true);
+    } else {
+      xpAccessible->SetSelected(true);
+    }
+
     return S_OK;
   }
 
   if (flagsSelect & SELFLAG_REMOVESELECTION) {
-    xpAccessible->SetSelected(false);
+    if (xpAccessible->IsProxy()) {
+      xpAccessible->Proxy()->SetSelected(false);
+    } else {
+      xpAccessible->SetSelected(false);
+    }
+
     return S_OK;
   }
 
@@ -889,7 +984,12 @@ AccessibleWrap::accLocation(
   if (xpAccessible->IsDefunct())
     return CO_E_OBJNOTCONNECTED;
 
-  nsIntRect rect = xpAccessible->Bounds();
+  nsIntRect rect;
+  if (xpAccessible->IsProxy()) {
+    rect = xpAccessible->Proxy()->Bounds();
+  } else {
+    rect = xpAccessible->Bounds();
+  }
 
   *pxLeft = rect.x;
   *pyTop = rect.y;
@@ -923,22 +1023,6 @@ AccessibleWrap::accNavigate(
   if (accessible->IsDefunct())
     return CO_E_OBJNOTCONNECTED;
 
-  // Make sure that varStart != CHILDID_SELF so we don't infinitely recurse
-  if (accessible->IsProxy() && varStart.vt == VT_I4 &&
-      varStart.lVal != CHILDID_SELF) {
-    // Now that we have the starting object, delegate this request to that
-    // object as a self-relative request...
-    RefPtr<IAccessible> comProxy;
-    accessible->GetNativeInterface((void**) getter_AddRefs(comProxy));
-    if (!comProxy) {
-      return E_UNEXPECTED;
-    }
-    VARIANT selfChildId;
-    selfChildId.vt = VT_I4;
-    selfChildId.lVal = CHILDID_SELF;
-    return comProxy->accNavigate(navDir, selfChildId, pvarEndUpAt);
-  }
-
   Accessible* navAccessible = nullptr;
   Maybe<RelationType> xpRelation;
 
@@ -996,8 +1080,16 @@ AccessibleWrap::accNavigate(
   pvarEndUpAt->vt = VT_EMPTY;
 
   if (xpRelation) {
-    Relation rel = RelationByType(*xpRelation);
-    navAccessible = rel.Next();
+    if (accessible->IsProxy()) {
+      nsTArray<ProxyAccessible*> targets =
+        accessible->Proxy()->RelationByType(*xpRelation);
+      if (targets.Length()) {
+        navAccessible = WrapperFor(targets[0]);
+      }
+    } else {
+      Relation rel = RelationByType(*xpRelation);
+      navAccessible = rel.Next();
+    }
   }
 
   if (!navAccessible)
@@ -1026,7 +1118,15 @@ AccessibleWrap::accHitTest(
   if (IsDefunct())
     return CO_E_OBJNOTCONNECTED;
 
-  Accessible* accessible = ChildAtPoint(xLeft, yTop, eDirectChild);
+  Accessible* accessible = nullptr;
+  if (IsProxy()) {
+    ProxyAccessible* proxy = Proxy()->ChildAtPoint(xLeft, yTop, eDirectChild);
+    if (proxy) {
+      accessible = WrapperFor(proxy);
+    }
+  } else {
+    accessible = ChildAtPoint(xLeft, yTop, eDirectChild);
+  }
 
   // if we got a child
   if (accessible) {
@@ -1064,6 +1164,10 @@ AccessibleWrap::accDoDefaultAction(
   if (xpAccessible->IsDefunct())
     return CO_E_OBJNOTCONNECTED;
 
+  // TODO make this work with proxies.
+  if (xpAccessible->IsProxy())
+    return xpAccessible->Proxy()->DoAction(0) ? S_OK : E_INVALIDARG;
+
   return xpAccessible->DoAction(0) ? S_OK : E_INVALIDARG;
 
   A11Y_TRYBLOCK_END