If I’m understanding, you want to change from this
<tr>
<td>1</td>
<td>2</td>
<td>3</td>
<td>4</td>
<td>5</td>
<td>6</td>
</tr>
to this
<tr>
<td>4</td>
<td>5</td>
<td>6</td>
<td>1</td>
<td>2</td>
<td>3</td>
</tr>
My first thought was that JavaScript would be needed.
You apparently managed to do something in your browsers dev tools to get the screenshot.
Do you remember what that was?