Do we have HTML tables?

Either I have forgotten the syntax for HTML tables or the interpreter here doesn’t parse colspan and and rowspan values correctly.

parametervalue
gravity9.8ms^-2
diameter12 637km
1.0D
parameter value
gravity 9.8 ms^-2
diameter 12 637
1.0
km
D

Hmm.

parameter value
gravity 9.8 ms^-2
diameter 12 637
1.0
km
D

Hmm. I suppose I can manage.