[css3-flexbox] "flexbox formatting context"

The spec has Issue 3 "figure out the right terms to use here", apparently on "flexbox formatting context".

I think the right term to use there is "box formatting context".

The meaning of the term is exactly what the paragraph before the issue says - "floats must not intrude into the flexbox, and the flexbox's margins do not collapse with the margins of its contents". Kind of layout doesn't matter for being a BFC (Tables use the term for the same purpose http://www.w3.org/TR/CSS21/tables.html#model ).