[css-writing-modes] Orthogonal parent's logical width

I read Orthogonal Flows[1] several times but as far as I understand, it
does not define how to calculate parent's logical width (i.e., children's
logical height.) It describes relationship of children's logical width and
parent's logical height though.

I'm assuming, after children was layout and children's logical height was
determined, it becomes both min-content and max-content of logical width
for the parent. Is this correct?

I have a bug in Blink related with this, appreciate to know if my
understanding above does not seem correct.

[1] http://dev.w3.org/csswg/css-writing-modes-3/#orthogonal-flows

/koji