diff -r 000000000000 -r 6474c204b198 layout/tables/nsITableCellLayout.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/tables/nsITableCellLayout.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,35 @@
+/* -*- 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/. */
+#ifndef nsITableCellLayout_h__
+#define nsITableCellLayout_h__
+
+#include "nsQueryFrame.h"
+
+/**
+ * nsITableCellLayout
+ * interface for layout objects that act like table cells.
+ *
+ * @author  sclark
+ */
+class nsITableCellLayout
+{
+public:
+
+  NS_DECL_QUERYFRAME_TARGET(nsITableCellLayout)
+
+  /** return the mapped cell's row and column indexes (starting at 0 for each) */
+  NS_IMETHOD GetCellIndexes(int32_t &aRowIndex, int32_t &aColIndex)=0;
+
+  /** return the mapped cell's row index (starting at 0 for the first row) */
+  virtual nsresult GetRowIndex(int32_t &aRowIndex) const = 0;
+  
+  /** return the mapped cell's column index (starting at 0 for the first column) */
+  virtual nsresult GetColIndex(int32_t &aColIndex) const = 0;
+};
+
+#endif
+
+
+