<th> — table header — A header cell in a
<td> — table data — A data cell in a
Allows a single table cell to span the width of more than one cell or column.
Allows a single table cell to span the height of more than one cell or row.
rowspan=?Sometimes it makes sense for a cell to span multiple columns or multiple rows. This might be used for a header cell that titles a group of columns, or a side-bar that groups rows of entries.
rowspan= are attributes of the two table-cell elements,
<td>. They provide the same functionality as “merge cell” in spreadsheet programs like Excel.
The value of either attribute must be a positive integer (a whole number). The value specifies the number of columns or rows that the cell fills.