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chromium/third_party/blink/web_tests/external/wpt/html/rendering/non-replaced-elements/tables/table-row-group-direction-ref.html 

<!DOCTYPE html>
<title>Table row-group direction</title>

<style>
  table {
    border-collapse: collapse;
  }

  td {
    border: 2px solid black;
    width: 20px;
    height: 20px;
  }

  td.special {
    border-left: 5px solid green;
    border-right: 5px solid blue;
  }
</style>

Normal table with LTR and RTL row groups:
<table>
  <tr>
    <td></td>
    <td class="special"></td>
  </tr>
  <tr>
    <td></td>
    <td class="special"></td>
  </tr>
</table>

<hr>

RTL table with LTR and RTL row groups:
<table>
  <tr>
    <td class="special"></td>
    <td></td>
  </tr>
  <tr>
    <td class="special"></td>
    <td></td>
  </tr>
</table>