defines a group of columns in the table and allows you to set properties of
those columns.
<THEAD ...>, <TBODY ...> , <TFOOT ...>
<THEAD ...>, <TBODY ...>, and <TFOOT ...> establish groups
of rows.
<THEAD ...> indicates that a group of rows are the header rows at the
top of the table. <TBODY ...> indicates that a group of rows are body
rows. <TFOOT ...> indicates that a group of rows are the footer rows at
the bottom of the table.