NEW ANSWER
You can use as many <tbody> tags as you like. I didn't realize that was ok by W3C until now. Not to say my below solution doesn't work (it does), but to do what you're trying to do, assign your <tbody> tags classes and then reference their individual <td> tags through CSS like so:
table tbody.yourClass td {
padding: 10px;
}
and your HTML thusly:
<table>
<tbody>
<tr><td>Text</td></tr>
<tr><td>Text</td></tr>
<tr><td>Text</td></tr>
</tbody>
<tbody class="yourClass">
<tr><td>Text</td></tr>
<tr><td>Text</td></tr>
<tr><td>Text</td></tr>
</tbody>
<tbody>
<tr><td>Text</td></tr>
<tr><td>Text</td></tr>
<tr><td>Text</td></tr>
</tbody>
</table>
Try that guy out :)
OLD ANSWER
whatever you do, DON'T insert blank rows...
you shouldn't have more than 1 tbody element in your table. what you can do is set the class or id attribute in your <tr> elements and give their corresponding <td> tags padding:
table {
border-collapse: collapse;
}
tr.yourClass td {
padding: 10px;
}
You can even assign the top and bottom <tr>'s an additional class so that they only do top or bottom padding, respectively:
tr.yourClass.topClass td {
padding: 10px 0 0 0;
}
tr.yourClass.bottomClass td {
padding: 0 0 10px 0;
}
and in your HTML, your <tr> tag would look like this:
<table>
<tbody>
<tr><td>Text</td></tr>
<tr><td>Text</td></tr>
<tr><td>Text</td></tr>
<tr class="yourClass topClass"><td>Text</td></tr>
<tr class="yourClass"><td>Text</td></tr>
<tr class="yourClass bottomClass"><td>Text</td></tr>
<tr><td>Text</td></tr>
<tr><td>Text</td></tr>
<tr><td>Text</td></tr>
</tbody>
</table>
Hope this helps!