Clearing Siblings' Children
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Now with odd thicknesses...
border-radius:2em tests
solid solid solid solid
solid solid solid solid
solid solid solid none
solid solid none solid
solid solid none none
solid none solid solid
solid none solid none
solid none none solid
solid none none none
none solid solid solid
none solid solid none
none solid none solid
none solid none none
none none solid solid
none none solid none
none none none solid
none none none none
border-radius:0 tests
solid solid solid solid
solid solid solid solid
solid solid solid none
solid solid none solid
solid solid none none
solid none solid solid
solid none solid none
solid none none solid
solid none none none
none solid solid solid
none solid solid none
none solid none solid
none solid none none
none none solid solid
none none solid none
none none none solid
none none none none