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diff --git a/accessible/interfaces/nsIAccessibleVirtualCursorChangeEvent.idl b/accessible/interfaces/nsIAccessibleVirtualCursorChangeEvent.idl
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+++ b/accessible/interfaces/nsIAccessibleVirtualCursorChangeEvent.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 "nsIAccessibleEvent.idl"
+
+/*
+ * An interface for virtual cursor changed events.
+ * Passes previous cursor position and text offsets.
+ */
+[scriptable, builtinclass, uuid(a58693b1-009e-4cc9-ae93-9c7d8f85cfdf)]
+interface nsIAccessibleVirtualCursorChangeEvent : nsIAccessibleEvent
+{
+  /**
+   * Previous object pointed at by virtual cursor, null if none.
+   */
+  readonly attribute nsIAccessible oldAccessible;
+
+  /**
+   * Previous start offset of pivot, otherwise -1.
+   */
+  readonly attribute long oldStartOffset;
+
+  /**
+   * Previous end offset of pivot, otherwise -1.
+   */
+  readonly attribute long oldEndOffset;
+
+  /**
+   * New object pointed at by virtual cursor, null if none.
+   */
+  readonly attribute nsIAccessible newAccessible;
+
+  /**
+   * New start offset of pivot, otherwise -1.
+   */
+  readonly attribute long newStartOffset;
+
+  /**
+   * New end offset of pivot, otherwise -1.
+   */
+  readonly attribute long newEndOffset;
+
+  /**
+   * Reason for virtual cursor move.
+   */
+  readonly attribute short reason;
+
+  /**
+   * Text boundary type for movement, NO_BOUNDARY if none.
+   */
+  readonly attribute short boundaryType;
+};