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diff --git a/accessible/interfaces/nsIAccessibleRelation.idl b/accessible/interfaces/nsIAccessibleRelation.idl
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+++ b/accessible/interfaces/nsIAccessibleRelation.idl
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+/* -*- 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 "nsISupports.idl"
+#include "nsIArray.idl"
+
+interface nsIAccessible;
+
+/**
+ * This interface gives access to an accessible's set of relations.
+ */
+[scriptable, builtinclass, uuid(55b308c4-2ae4-46bc-b4cd-4d4370e0a660)]
+interface nsIAccessibleRelation : nsISupports
+{
+  /**
+   * This object is labelled by a target object.
+   */
+  const unsigned long RELATION_LABELLED_BY = 0x00;
+
+  /**
+   * This object is label for a target object.
+   */
+  const unsigned long RELATION_LABEL_FOR = 0x01;
+
+  /**
+   * This object is described by the target object.
+   */
+  const unsigned long RELATION_DESCRIBED_BY = 0x02;
+
+  /**
+   * This object is describes the target object.
+   */
+  const unsigned long RELATION_DESCRIPTION_FOR = 0x3;
+
+  /**
+   * This object is a child of a target object.
+   */
+  const unsigned long RELATION_NODE_CHILD_OF = 0x4;
+
+  /**
+   * This object is a parent of a target object. A dual relation to
+   * RELATION_NODE_CHILD_OF
+   */
+  const unsigned long RELATION_NODE_PARENT_OF = 0x5;
+
+  /**
+   * Some attribute of this object is affected by a target object.
+   */
+  const unsigned long RELATION_CONTROLLED_BY = 0x06;
+
+  /**
+   * This object is interactive and controls some attribute of a target object.
+   */
+  const unsigned long RELATION_CONTROLLER_FOR = 0x07;
+
+  /**
+   * Content flows from this object to a target object, i.e. has content that
+   * flows logically to another object in a sequential way, e.g. text flow.
+   */
+  const unsigned long RELATION_FLOWS_TO = 0x08;
+
+  /**
+   * Content flows to this object from a target object, i.e. has content that
+   * flows logically from another object in a sequential way, e.g. text flow.
+   */
+  const unsigned long RELATION_FLOWS_FROM = 0x09;
+
+  /**
+   * This object is a member of a group of one or more objects. When there is
+   * more than one object in the group each member may have one and the same
+   * target, e.g. a grouping object.  It is also possible that each member has
+   * multiple additional targets, e.g. one for every other member in the group.
+   */
+  const unsigned long RELATION_MEMBER_OF = 0x0a;
+
+  /**
+   * This object is a sub window of a target object.
+   */
+  const unsigned long RELATION_SUBWINDOW_OF = 0x0b;
+
+  /**
+   * This object embeds a target object. This relation can be used on the
+   * OBJID_CLIENT accessible for a top level window to show where the content
+   * areas are.
+   */
+  const unsigned long RELATION_EMBEDS = 0x0c;
+
+  /**
+   * This object is embedded by a target object.
+   */
+  const unsigned long RELATION_EMBEDDED_BY = 0x0d;
+
+  /**
+   * This object is a transient component related to the target object. When
+   * this object is activated the target object doesn't lose focus.
+   */
+  const unsigned long RELATION_POPUP_FOR = 0x0e;
+
+  /**
+   * This object is a parent window of the target object.
+   */
+  const unsigned long RELATION_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.
+   */
+  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 window object.
+   */
+  const unsigned long RELATION_CONTAINING_WINDOW = 0x13;
+
+  /**
+   * The target object is the containing application object.
+   */
+  const unsigned long RELATION_CONTAINING_APPLICATION = 0x14;
+
+  /**
+   * The target object provides the detailed, extended description for this
+   * object. It provides more detailed information than would normally be
+   * provided using the DESCRIBED_BY relation. A common use for this relation is
+   * in digital publishing where an extended description needs to be conveyed in
+   * a book that requires structural markup or the embedding of other technology
+   * to provide illustrative content.
+   */
+  const unsigned long RELATION_DETAILS = 0x15;
+
+  /**
+   * This object provides the detailed, extended description for the target
+   * object. See DETAILS relation.
+   */
+  const unsigned long RELATION_DETAILS_FOR = 0x16;
+
+  /**
+   * The target object is the error message for this object.
+   */
+  const unsigned long RELATION_ERRORMSG = 0x17;
+
+  /**
+   * This object is the error message for the target object.
+   */
+  const unsigned long RELATION_ERRORMSG_FOR = 0x18;
+
+  /**
+   * Returns the type of the relation.
+   */
+  readonly attribute unsigned long relationType;
+
+  /**
+   * Returns the number of targets for this relation.
+   */
+  readonly attribute unsigned long targetsCount;
+
+  /**
+   * Returns one accessible relation target.
+   * @param index - 0 based index of relation target.
+   */
+  nsIAccessible getTarget(in unsigned long index);
+
+  /**
+   * Returns multiple accessible relation targets.
+   */
+  nsIArray getTargets();
+};