RE: [css3-background] background-size and zero length

> Yes, because the syntax for background-size in the shorthand wasn't 
> finalized as of when we implemented -moz-background-size.  I doubt we'll 
> add it to the shorthand until we switch from -moz-background-size to 
> background-size, for that matter.

To be clear, my concern was not about the shorthands.  I realize those are where they are today for reasons that have been discussed previously.  It was just necessary to explain why the examples showing the concern had complications to produce.

-Brian