diff -r 000000000000 -r 6474c204b198 accessible/src/windows/msaa/DocAccessibleWrap.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/accessible/src/windows/msaa/DocAccessibleWrap.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,157 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "DocAccessibleWrap.h"
+
+#include "Compatibility.h"
+#include "nsWinUtils.h"
+#include "mozilla/dom/TabChild.h"
+#include "Role.h"
+#include "RootAccessible.h"
+#include "sdnDocAccessible.h"
+#include "Statistics.h"
+
+#include "nsIDocShell.h"
+#include "nsIInterfaceRequestorUtils.h"
+
+using namespace mozilla;
+using namespace mozilla::a11y;
+
+////////////////////////////////////////////////////////////////////////////////
+// DocAccessibleWrap
+////////////////////////////////////////////////////////////////////////////////
+
+DocAccessibleWrap::
+  DocAccessibleWrap(nsIDocument* aDocument, nsIContent* aRootContent,
+                    nsIPresShell* aPresShell) :
+  DocAccessible(aDocument, aRootContent, aPresShell), mHWND(nullptr)
+{
+}
+
+DocAccessibleWrap::~DocAccessibleWrap()
+{
+}
+
+IMPL_IUNKNOWN_QUERY_HEAD(DocAccessibleWrap)
+  if (aIID == IID_ISimpleDOMDocument) {
+    statistics::ISimpleDOMUsed();
+    *aInstancePtr = static_cast<ISimpleDOMDocument*>(new sdnDocAccessible(this));
+    static_cast<IUnknown*>(*aInstancePtr)->AddRef();
+    return S_OK;
+  }
+IMPL_IUNKNOWN_QUERY_TAIL_INHERITED(HyperTextAccessibleWrap)
+
+STDMETHODIMP
+DocAccessibleWrap::get_accValue(VARIANT aVarChild, BSTR __RPC_FAR* aValue)
+{
+  A11Y_TRYBLOCK_BEGIN
+
+  if (!aValue)
+    return E_INVALIDARG;
+  *aValue = nullptr;
+
+  // For backwards-compat, we still support old MSAA hack to provide URL in accValue
+  // Check for real value first
+  HRESULT hr = AccessibleWrap::get_accValue(aVarChild, aValue);
+  if (FAILED(hr) || *aValue || aVarChild.lVal != CHILDID_SELF)
+    return hr;
+
+  // If document is being used to create a widget, don't use the URL hack
+  roles::Role role = Role();
+  if (role != roles::DOCUMENT && role != roles::APPLICATION && 
+      role != roles::DIALOG && role != roles::ALERT) 
+    return hr;
+
+  nsAutoString URL;
+  nsresult rv = GetURL(URL);
+  if (URL.IsEmpty())
+    return S_FALSE;
+
+  *aValue = ::SysAllocStringLen(URL.get(), URL.Length());
+  return *aValue ? S_OK : E_OUTOFMEMORY;
+
+  A11Y_TRYBLOCK_END
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Accessible
+
+void
+DocAccessibleWrap::Shutdown()
+{
+  // Do window emulation specific shutdown if emulation was started.
+  if (nsWinUtils::IsWindowEmulationStarted()) {
+    // Destroy window created for root document.
+    if (mDocFlags & eTabDocument) {
+      nsWinUtils::sHWNDCache->Remove(mHWND);
+      ::DestroyWindow(static_cast<HWND>(mHWND));
+    }
+
+    mHWND = nullptr;
+  }
+
+  DocAccessible::Shutdown();
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// DocAccessible public
+
+void*
+DocAccessibleWrap::GetNativeWindow() const
+{
+  return mHWND ? mHWND : DocAccessible::GetNativeWindow();
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// DocAccessible protected
+
+void
+DocAccessibleWrap::DoInitialUpdate()
+{
+  DocAccessible::DoInitialUpdate();
+
+  if (nsWinUtils::IsWindowEmulationStarted()) {
+    // Create window for tab document.
+    if (mDocFlags & eTabDocument) {
+      mozilla::dom::TabChild* tabChild =
+        mozilla::dom::TabChild::GetFrom(mDocumentNode->GetShell());
+
+      a11y::RootAccessible* rootDocument = RootAccessible();
+
+      mozilla::WindowsHandle nativeData = 0;
+      if (tabChild)
+        tabChild->SendGetWidgetNativeData(&nativeData);
+      else
+        nativeData = reinterpret_cast<mozilla::WindowsHandle>(
+          rootDocument->GetNativeWindow());
+
+      bool isActive = true;
+      int32_t x = CW_USEDEFAULT, y = CW_USEDEFAULT, width = 0, height = 0;
+      if (Compatibility::IsDolphin()) {
+        GetBounds(&x, &y, &width, &height);
+        int32_t rootX = 0, rootY = 0, rootWidth = 0, rootHeight = 0;
+        rootDocument->GetBounds(&rootX, &rootY, &rootWidth, &rootHeight);
+        x = rootX - x;
+        y -= rootY;
+
+        nsCOMPtr<nsISupports> container = mDocumentNode->GetContainer();
+        nsCOMPtr<nsIDocShell> docShell = do_QueryInterface(container);
+        docShell->GetIsActive(&isActive);
+      }
+
+      HWND parentWnd = reinterpret_cast<HWND>(nativeData);
+      mHWND = nsWinUtils::CreateNativeWindow(kClassNameTabContent, parentWnd,
+                                             x, y, width, height, isActive);
+
+      nsWinUtils::sHWNDCache->Put(mHWND, this);
+
+    } else {
+      DocAccessible* parentDocument = ParentDocument();
+      if (parentDocument)
+        mHWND = parentDocument->GetNativeWindow();
+    }
+  }
+}