6441.md

```
% pandoc -f org -t html
#+ATTR_HTML: :class table-dark
| h1 | h2 |
|----|----|
| c1 | c2 |
^D
<table class="table-dark">
<thead>
<tr>
<th>h1</th>
<th>h2</th>
</tr>
</thead>
<tbody>
<tr>
<td>c1</td>
<td>c2</td>
</tr>
</tbody>
</table>
```