table.html

<style>
  .border-top{
    border-top:1px solid;
  }
  .border-bottom{
    border-top:1px solid;
  }
</style>
<table>
  <tr class="border-top border-bottom">
    <th>HR Only Training</th>
    <th colspan="6">Testing Split</th>
  </tr>
  <tr class="border-top border-bottom">
    <th>Training Split</th>
    <th>de_1m_2013</th>
    <th>ny_1m_2013</th>
    <th>md_1m_2013</th>
    <th>pa_1m_2013</th>
    <th>va_1m_2014</th>
    <th>wv_1m_2014</th>
  </tr>
  <tr>
    <td>de_1m_2013</td>
    <td>12%</td>
    <td></td>
    <td></td>
    <td></td>
    <td></td>
    <td></td>
  </tr>
  <tr>
    <td>ny_1m_2013</td>
    <td></td>
    <td></td>
    <td></td>
    <td></td>
    <td></td>
    <td></td>
  </tr>
  <tr>
    <td>md_1m_2013</td>
    <td></td>
    <td></td>
    <td></td>
    <td></td>
    <td></td>
    <td></td>
  </tr>
  <tr>
    <td>pa_1m_2013</td>
    <td></td>
    <td></td>
    <td></td>
    <td></td>
    <td></td>
    <td></td>
  </tr>
  <tr>
    <td>va_1m_2014</td>
    <td></td>
    <td></td>
    <td></td>
    <td></td>
    <td></td>
    <td></td>
  </tr>
  <tr>
    <td>wv_1m_2014</td>
    <td></td>
    <td></td>
    <td></td>
    <td></td>
    <td></td>
    <td></td>
  </tr>
</table>