Description

A Table::Head object represents a single <THEAD></THEAD> instance for an
HTML Table.

Notes

In virtually every respect the Table::Head class is identical to
the Table or Table::Row class.  There are two significant differences.
First, the Table::Head class is a singleton.  There can be only one
Table::Head instance per table.  Second, if an instance of Table::Head
is added to a table, it will be automatically be put at index 0 (or 1
if a Table::Caption exists).