[Turtle91]

… or simply build it in html in the first place. In Sigil I have a blank table template set as a clip. One click gives me:

- I prefer working with tables in this compact format -

<table>
  <thead>
    <tr><th></th><th></th><th></th></tr>
  </thead>
  <tbody>
    <tr><td></td><td></td><td></td></tr>
    <tr><td></td><td></td><td></td></tr>
    <tr><td></td><td></td><td></td></tr>
  </tbody>
  <tfoot>
    <tr><td></td><td></td><td></td></tr>
  </tfoot>
</table>

- although some people prefer to see it like this - 

<table>
  <thead>
    <tr>
      <th></th>
      <th></th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td></td>
      <td></td>
    </tr>
    <tr>
      <td></td>
      <td></td>
    </tr>
  </tbody>
  <tfoot>
    <tr>
      <td></td>
      <td></td>
    </tr>
  </tfoot>
</table>

Then a few copy/paste/delete to refine the number of columns/rows and if I need header/footer rows. Then I can easily insert class/colspan as needed.

This literally takes a minute to do.

Now I just type in the data.
Style (as needed) using a css sheet (shame to any who use inline styles - shame!)

Result: perfectly legit table in my ePub!