showdownjs/test/features/tables/basic-alignment.html

<table>
  <thead>
    <tr>
      <th id="first_header" style="text-align:left;"> First Header  </th>
      <th id="second_header" style="text-align:left;"> Second Header </th>
    </tr>
  </thead>

  <tbody>
    <tr>
      <td style="text-align:left;"><p>Row 1 Cell 1  </p></td>
      <td style="text-align:left;"><p>Row 1 Cell 2  </p></td>
    </tr>

    <tr>
      <td style="text-align:left;"><p>Row 2 Cell 1  </p></td>
      <td style="text-align:left;"><p>Row 2 Cell 2  </p></td>
    </tr>

  </tbody>
</table>