Re: [CSS3, border-radius] transition between styles (was: now is?real fun.

What are the use cases for different border styles on different sides?
Knowing why someone would use different styles may also tell us what
transitioning rule(s) would achieve that intent.

> There are two trivial morphing rules.  One is to just do a sharp
> transition.  The other is to do a crossfade between the two styles.

The "sharp transition" possibility can further be divided according
to where the transition line occurs.
We may end up with a rule involving precedence, perhaps comparable to
http://www.w3.org/TR/CSS21/tables.html#border-conflict-resolution.

pjrm.