[html4all] Better AT user testing of table features

[Joshue O Connor]

Hi Leif,

> What do you think? Especially what do our «test masters» Steve and Joshue think?

I would be glad to do more testing but it will have to wait until the
end of this month as I am totally oversubscribed at the moment.
However, please do prepare some test suites/cases and sent them on to me.

Cheers

Josh