Tables have headers defined, as appropriate

From WolfWikis

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Explanation

If your table has data in it you need to indicate if any of the rows or columns have labels for the rows or columns. You do this by changing <td></td> to <th></th> for the header cells. In Dreamweaver you can also click on the cell or range of cells and click "Header" in the Property Inspector.

All of this holds true for simple tables. If your table has header labels in cells other than the first row or column you will need to use the scope attribute to indicate your headers. For more information please visit http://www.webaim.org/techniques/tables/data.php.

If you are using tables strictly for layout purposes you do not need to mark any table headers.