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diff --git a/accessible/basetypes/TableCellAccessible.h b/accessible/basetypes/TableCellAccessible.h
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+++ b/accessible/basetypes/TableCellAccessible.h
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+/* -*- 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/. */
+
+#ifndef mozilla_a11y_TableCellAccessible_h__
+#define mozilla_a11y_TableCellAccessible_h__
+
+#include "nsTArray.h"
+#include <stdint.h>
+
+namespace mozilla {
+namespace a11y {
+
+class Accessible;
+class TableAccessible;
+
+/**
+ * Abstract interface implemented by table cell accessibles.
+ */
+class TableCellAccessible {
+ public:
+  /**
+   * Return the table this cell is in.
+   */
+  virtual TableAccessible* Table() const = 0;
+
+  /**
+   * Return the column of the table this cell is in.
+   */
+  virtual uint32_t ColIdx() const = 0;
+
+  /**
+   * Return the row of the table this cell is in.
+   */
+  virtual uint32_t RowIdx() const = 0;
+
+  /**
+   * Return the column extent of this cell.
+   */
+  virtual uint32_t ColExtent() const { return 1; }
+
+  /**
+   * Return the row extent of this cell.
+   */
+  virtual uint32_t RowExtent() const { return 1; }
+
+  /**
+   * Return the column header cells for this cell.
+   */
+  virtual void ColHeaderCells(nsTArray<Accessible*>* aCells) = 0;
+
+  /**
+   * Return the row header cells for this cell.
+   */
+  virtual void RowHeaderCells(nsTArray<Accessible*>* aCells) = 0;
+
+  /**
+   * Returns true if this cell is selected.
+   */
+  virtual bool Selected() = 0;
+};
+
+}  // namespace a11y
+}  // namespace mozilla
+
+#endif  // mozilla_a11y_TableCellAccessible_h__