Nested percentage heights

outer
19
block:perc
table:perc
20
table:perc
tr:perc
21
block:auto
overflow:hidden
22
block:auto
width:auto
inner
block:perc
table:perc
tr:perc
td:perc
replaced:perc
table:perc
tr:perc
table:perc
tr:perc
td:perc
tr:perc
td:perc
table:perc
td:perc