RE: [css3-box] padding: auto

[Simon Sapin:]

> Yes, and don't forget the various layout modes. CSS 2.1 has not only
> inlines and blocks but also inline-blocks, floats, absopos, tables (fixed
> layout or auto layout). Then there is multicol, page-margin boxes,
> flexbox, other CSS 3 layout modules ...

Oh yes, min/max was just one arbitrary choice of 'things we'd probably need 
to update'.

> 
> I'm not saying 'padding: auto' is impossible 
> 
+1 . Enabling this one scenario with padding:auto may come with a fair amount
of other delicate baggage. Though some of it could be good if it enables other 
use-cases. 

> and I don't know why the ::outside pseudo-element was abandoned, but I think 
>that the latter is much more realistic.
I don't know about ::outside; but discussing other ways to achieve the same
result would be helpful imo.