Edit fiddle - JSFiddle - React, Tailwind, and code Playground

JSFiddle - React, Tailwind, and code Playground

HTML

<table>
  <thead>
    <tr>
      <th>col 1</th>
      <th colspan="3">col2</th>
    </tr>
    <tr>
      <th></th>
      <th>h1</th>
      <th>h2</th>
      <th>h3</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>row1</td>
      <td>data1</td>
      <td>data2</td>
      <td>data3</td>
      <td>data4</td>
      <td>data5</td>
      <td>data6</td>
    </tr>
    <tr>
      <td>row2</td>
      <td>data1</td>
      <td>data2</td>
      <td>data3</td>
    </tr>
  </tbody>
</table>

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JSFiddle - React, Tailwind, and code Playground

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