The semantic HTML
<tr></tr> element defines a table row. It must be placed within a
<tfoot> element and may only contain
<th> elements. The end tag may be omitted if the
<tr> element is immediately followed by another
<tr> element, or if the parent
<table> element doesn't have any more content.
<table> <tr> <td>1</td> <td>2</td> <td>3</td> </tr> </table>