Hi,
I have just been testing this in my Moodle 3.0 using the equivalent Essential Theme.
To get this to work you need to first add the class="table" to the table itself.
Next all you have to do is add to the <td> tag the following:
class="success" if you want a green background color
class="error" if you want a pink background color
<table class="table">
<caption>TEST</caption>
<tbody>
<tr>
<td class="success">SUCCESS</td>
<td>1</td>
<td>2</td>
</tr>
<tr>
<td class="error">ERROR</td>
<td>1</td>
<td>2</td>
</tr>
</tbody>
</table>
SUCCESS | 1 | 2 |
ERROR | 1 | 2 |
Sadly it does not work here but it does in Essential theme for Moodle 3.0
Hope this helps?
Mary.