1 Pass: parent -webkit-column-count = 2
2 Pass: parent -webkit-column-width = 64px
3 Pass: child0 -webkit-column-count = 2
4 Pass: child0 -webkit-column-width = 64px
5 Pass: child1 -webkit-column-count = 2
6 Pass: child1 -webkit-column-width = auto
7 Pass: child2 -webkit-column-count = auto
8 Pass: child2 -webkit-column-width = 64px