How can one divide a column into 2 so that to create a duplicate? Html

Question

column division

Answer 1

i think its not possible, but there is a workaround. at the row before you can merge 2 column, to make the effect that the column at current row divide by 2
<tr>
<td colspan="2">this one</td>
</tr>
<tr>
<td>is</td>
<td>divided</td>
</tr>

Answer 2

how about using css?

Answer 3

maybe you can, but idk if its worth the effort