The tr tag denotes a row in a table. It works the same as in HTML. It can occur only in a table tag, and should contain only td table data tags.
Example:
<table> <tr><td>Cell (1,1)</td><td>Cell (2,1)</td></tr> <tr><td>Cell (1,2)</td><td>Cell (2,2)</td></tr> </table>
Will be formatted approximately as
| Cell (1,1) | Cell (2,1) |
| Cell (1,2) | Cell (2,2) |