Normally, there are two types of cells available in a table. They are "Header and Standard Cell". 1] Header Cells are created by <th>. It owns header information. 2] Standard Cells are created by <td>. It has general information. Element Specific attributes supported by this tag are:
Groups the cells from the specified number of columns into a sole cell.
Denotes the multiple header cells to which the cell is related to.
Combines the cells from the specified number of rows into an individual cell.
col, colgroup, row, rowgroup
Denotes the header cell acts as header for column, row or group of columns or row.
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It must be placed inside the <tr> and </tr> should be placed inside the <table>.