diff -r 000000000000 -r 6474c204b198 accessible/src/xpcom/nsAccessibleRelation.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/accessible/src/xpcom/nsAccessibleRelation.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,62 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 "nsAccessibleRelation.h"
+
+#include "Relation.h"
+#include "Accessible.h"
+
+#include "nsArrayUtils.h"
+#include "nsComponentManagerUtils.h"
+
+using namespace mozilla::a11y;
+
+nsAccessibleRelation::nsAccessibleRelation(uint32_t aType,
+                                           Relation* aRel) :
+  mType(aType)
+{
+  mTargets = do_CreateInstance(NS_ARRAY_CONTRACTID);
+  nsIAccessible* targetAcc = nullptr;
+  while ((targetAcc = aRel->Next()))
+    mTargets->AppendElement(targetAcc, false);
+}
+
+// nsISupports
+NS_IMPL_ISUPPORTS(nsAccessibleRelation, nsIAccessibleRelation)
+
+// nsIAccessibleRelation
+NS_IMETHODIMP
+nsAccessibleRelation::GetRelationType(uint32_t *aType)
+{
+  NS_ENSURE_ARG_POINTER(aType);
+  *aType = mType;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsAccessibleRelation::GetTargetsCount(uint32_t *aCount)
+{
+  NS_ENSURE_ARG_POINTER(aCount);
+  *aCount = 0;
+  return mTargets->GetLength(aCount);
+}
+
+NS_IMETHODIMP
+nsAccessibleRelation::GetTarget(uint32_t aIndex, nsIAccessible **aTarget)
+{
+  NS_ENSURE_ARG_POINTER(aTarget);
+  nsresult rv = NS_OK;
+  nsCOMPtr<nsIAccessible> target = do_QueryElementAt(mTargets, aIndex, &rv);
+  target.forget(aTarget);
+  return rv;
+}
+
+NS_IMETHODIMP
+nsAccessibleRelation::GetTargets(nsIArray **aTargets)
+{
+  NS_ENSURE_ARG_POINTER(aTargets);
+  NS_ADDREF(*aTargets = mTargets);
+  return NS_OK;
+}