"G. Ken Holman" wrote:

> > What is the best approach for this problem?

> I would implement the sub-tables as individual tables.

Thanks for your answer. I will experiment with this approach.

> Since gaps are table-wide properties, I think embedding tables
> is best

Which property can I use to set the gap width?

 - the first specifies the separation in the inline-progression direction
 - that applies to the block-progression direction unless overridden
   with the second

The longhand is:  border-separation.inline-progression-direction="<length>"
                  border-separation.block-progression-direction="<length>"

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