How to avoid distributing rows evenly vertically in a table

[michanek]

I have a table with a spanned row looking like this:
+----------+---------+
| Spanned | Row A |
| row | |
| (several +---------+
| lines of | Row B |
| text) | |
+----------+---------+
The contents of Row A and B are vertically top-aligned, but the Rows are also distributed evenly vertically to have the same height as the spanned row.
I want the result ot be like this instread:
+----------+---------+
| Spanned | Row A |
| row +---------+
| (several | Row B |
| lines of | |
| text) | |
+----------+---------+
That is, I want Row A to be as small as possible and only Row B to expand vertically. Can this be done? I have tried various styling through CSS, including min-height, but the rows always seem to be distributed evenly.
In reality, I have more rows than A and B, and I want only the last one to expand vertically beyond the actual contents. I cannot predict the actual amount of content in any of the rows, so explicitly setting the height won't work.

[michanek]

Sorry, the tables should look like this:

+----------+---------+
| Spanned  |  Row A  |
| row      |         |
| (several +---------+
| lines of |  Row B  |
| text)    |         |
+----------+---------+

+----------+---------+
| Spanned  |  Row A  |
| row      +---------+
| (several |  Row B  |
| lines of |         |
| text)    |         |
+----------+---------+

[ariful alam]

Hello,
Do you need 1st column (single row) = 2nd column (two row)?

with regards
Ariful Alam

[michanek]

I'm not sure I understand your question. If you mean column widths, the 1st column will have a fixed width, but the 2nd column doesn't need to be. However, I feel that column widths shouldn't affect the question?

[Rabbit]

Can't you give Row A a fixed height?

[michanek]

No, because the content of Row A will vary. The point is that no row except the last should be higher than needed.
I will probably find another layout for this.

[Rabbit]

Rather than a table for layout, have you tried divs instead?