The opening and closing table html tags (<table>
</table>
) need to be inside your form tags. It is not valid html to split a table with a form so the browser ends the form straight away, see Is a form valid over a tr
This will give you:
<form>
<table>
<tr>
<td>
<div>Cell content</div>
</td>
</tr>
</table>
</form>