JSFiddle - React, Tailwind, and code Playground

HTML

<table>
  <tr>
    <td colspan=4>titre</td>
  </tr>
  <tr>
    <td rowspan=3>Cellule 1</td>
    <td>Cellule 2</td>
    <td colspan=2>Cellule 3</td>
  </tr>
  <tr>
    <td colspan=2>Cellule 4</td>
    <td>Cellule 5</td>
  </tr>
  <tr>
    <td colspan=3>Cellule 6</td>
  </tr>
  <tr>
    <td>Cellule X</td>
    <td>Cellule X</td>
    <td>Cellule X</td>
    <td>Cellule X</td>
  </tr>
</table>

CSS

table, td {border: 1px solid;}