[css3-transforms] Containing block for abspos

Hi,

The spec for the 'transform' property says:
> Any value other than ‘none’ for the transform results in the creation
> of both a stacking context and a containing block. The object acts as
> a containing block for fixed positioned descendants.

What about absolutely positioned descendants? Are their containing block 
still the nearest positioned ancestor, or is it the nearest ancestor 
that is either positioned or transformed?

-- 
Simon Sapin