These tests set the shape-outside to a <shape> <box> pair with writing-mode: vertical-lr, where the shape takes up its entire sizing box. They test for each of the various sizing boxes (margin/border/padding/content). They require the Ahem font. You should see green squares, with no red.

shape-outside: content-box

shape-outside: padding-box

shape-outside: border-box

shape-outside: margin-box