100 | 30% width

100 100 100 100 100 100 | 50% width

100 | no width given | 30% width
500 colspan=3

foo | no width given | 30% width
200 spans col 1-2 | last cell
first cell | 300 spans col 2-3

fooooo oooooo oooooo oooooo oooooo | bar

This is colspan=2 | Blah Blah Blah Blah Blah Blah Blah Blah Blah
This is colspan=3 blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah

no colspan declared | Blah Blah Blah Blah Blah Blah
This is colspan=2 blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah