Re: [css-flexbox] Making percentage margins/padding consistent with Grid

On Wed, Mar 6, 2013 at 7:50 PM, Ojan Vafai <ojan@chromium.org> wrote:
> What are the use-cases for percentage margin/padding? The block approach is
> easier to implement.

I don't understand how this is possible.  Why is it easier to compute
a percentage height than a percentage padding/margin?  The
calculations are identical.

The reason percentages on blocks work the way they do is because
blocks are nearly always auto-height, so in almost all cases
percentages can't be resolved, so resolving against the width instead
at least gives you *something* useful.  In flexbox, the height will
often be a definite size, so it makes sense for percentages on
vertical padding/margins to be consistent with percentages on heights.

~TJ and fantasai