attr_list extension doesn't work well with tables extension

[pkubiak]

Hi,
I have tried to add some styles to table created with tables extension using attr_list extension, but it works quite strange. For markdown:

| column 1 | column 2 |
|----------|----------|
| value 1 {: .text-primary} | value 2 {: .text-danger }|
{: .text-success }

it creates new empty row with cell of given class (with extensions=['markdown.extensions.extra']):

<table>
<thead>
<tr>
<th>column 1</th>
<th>column 2</th>
</tr>
</thead>
<tbody>
<tr>
<td class="text-primary">value 1 </td>
<td class="text-danger">value 2 </td>
</tr>
<tr>
<td class="text-success"></td>
<td></td>
</tr>
</tbody>
</table>

instead of setting class of whole table what I would expect:

<table class="text-success">
<thead>
<tr>
<th>column 1</th>
<th>column 2</th>
</tr>
</thead>
<tbody>
<tr>
<td class="text-primary">value 1 </td>
<td class="text-danger">value 2 </td>
</tr>
</tbody>
</table>

Is it a correct behavior of attr_list extension? or is there same workaround to style whole table?

>>> markdown.__version__
'3.1.1'

[waylan]

This is a duplicate of #312.