Pass condition is 4 green 100x100 squares and 1 0x0 square.

Firefox 84a1 passes. Chrome 87 fails them all by making the green rectangles be 200x100.

Transferred size suggestion is the stretched 100px:

Have to subtract the margin from the stretched height to get the transferred size suggestion:

Have to subtract a margin larger than the stretched height to get 0px transferred size suggestion:

Have to subtract the margin from the stretched height (ignoring the presence of a border) to get the transferred size suggestion:

Stretched transferred size suggestion has to obey min-height: