Re: [css3-conditional] Supported vs. valid declaration.

On 9/20/12 6:06 AM, Simon Sapin wrote:
> Hi,
>
> About sections §6.1 and §6.2, is there a difference between:
>
> 1. a declaration being 'invalid' (and thus being ignored by the parser
> to allow old-style fallbacks)
> 2. being 'not supported' (resolving to false in @supports)

There shouldn't be, ideally.

In Gecko, the same code implements both, so they're the same by 
definition there.

> I’m thinking in particular of 6.2’s comment on values that might be
> valid in a spec but the UA "do not have a usable level of support for".

Sane UAs would treat that as "invalid".  Of course historically not all 
UAs are always sane.  :(

-Boris