uint32_t
HTMLTableCellAccessible::ColExtent() const
{
  int32_t rowIdx = -1, colIdx = -1;
  GetCellIndexes(rowIdx, colIdx);

  TableAccessible* table = Table();
  NS_ASSERTION(table, "cell not in a table!");
  if (!table)
    return 0;

  return table->ColExtentAt(rowIdx, colIdx);
}