Visibility collapse

Spec

Setting a row to visibility:collapse changes table height but not width. Here, the spanning cell is the only cell in its row.

B
B
B
B
B
aaaa
bbbb
cccc
dddd
Bottom table is identical to top except second row has been collapsed. The spanning cell's height shrinks and is clipped.
B
B
B
B
B
aaaa
bbbb
cccc
dddd
This text should not intersect with the table.