[css-align] Definition of align-self inconsistent with css-flexbox for abspos

Hi there,

in reading http://dev.w3.org/csswg/css-align/#align-self-property I
noticed a discrepancy from flexbox for this property.

It says:
"The auto keyword is equivalent to start on replaced
absolutely-positioned boxes, and equivalent to stretch on all other
absolutely-positioned boxes. (This is because CSS 2.1 does not stretch
replaced elements to fit into fixed offsets.)"

However, in flexbox we have:
http://dev.w3.org/csswg/css-flexbox/#propdef-align-self
"Computed value:auto computes to parent’s align-items value; otherwise
as specified"

This should be made consistent, probably by changing css-align to have
an exception for flex/grid containers.

Separately, the prose in css-align never does specify what the
*computed* value is for auto. It says what auto is equivalent to, but
is not clear on whether that affects the computed value or not.

-christian