Tables are commonly written exactly are you have them <table><tr><td>…. However, according to the html spec all table rows <tr>’s are supposed to be contained within a <tbody> tag.
<table>
<tbody>
<tr>
...
</tr>
</tbody>
</table>
It is also better to use the <tbody> tag then you can take advantage of all of the html outline view features. ie, right-clicking a <tr> tag in the ouline view, lets you insert a row node <tr> before and after the current node. You won’t be able to do that if the table doesn’t have a <tbody>.