User:CiaPan/example of autoextending table cell

A table with a second cell in a first row being too long and looking too short:

The table with the cell set to rowspan=2:

Same table after adding one more row:

and with the cell modified to rowspan=3:

And this is a table with a single row and two columns – the first cell contains a nested table.

After adding some rows to the internal table, the right part (i.e. the second cell of a row of the external table) automagically expands vertically to fit the row's height.