Note this is a wiki page which lists potential techniques which may or may
not be developed. I think it is clear that TFOOT is not to be used for
footnotes for a table, but instead for column footers/summaries/totals.
Even for this case I think creating a failure would create a lot of
unnecessary work for developers who have column summaries/totals without
adding any accessibility gain. For this reason I have removed this from the
wiki above.
