Re: [selectors] Finding a way to run "complete" profile selectors in CSS

On Fri, Jul 12, 2013 at 12:38 PM, Tab Atkins Jr. <jackalmage@gmail.com>wrote:

> Whoops, didn't catch that there was more text later in the message.
> (Please use text-based formatting, not things like colors and
> indentation, to indicate quotes.  Some of us always use text-based
> email, and the list archives definitely do, so emails like yours are
> harder to understand later.)
>
> On Fri, Jul 12, 2013 at 7:16 AM, Timmy <timmywillisn@gmail.com> wrote:
> > This doesn't seem like the best API to me. If the problem is that we'd
> like
> > to be able to use selectors in the complete profile in CSS (rather than
> > through QSA), you're still required to call a javascript function (i.e.
> the
> > proposed .CSS) to use them? I say let's have a solution that is purely
> CSS.
> >
> > Perhaps this was already suggested, but what about taking a queue from
> > javascript strict mode and adding some sort of CSS statement to
> effectively
> > "turn on" selectors in the complete profile? It would be a way for the
> > developer to say that she is aware they are slower, but wants to use them
> > anyway. Perhaps this flag could be scoped so that it could be applied
> only
> > to a style element or only to a particular stylesheet.
> >
> > This seems simpler to me than the deferred at rule (as styles from the
> > complete profile can be anywhere in a user's CSS rather than separated
> into
> > at rules). If any of the selectors from the complete profile get fast
> enough
> > to warrant addition to the fast profile, no changes to code are necessary
> > (they just get faster).
>
> This would just be a "please make my entire page run slower" switch,
> which isn't acceptable.  What's worse, it would probably work fine on
> the developer's high-end desktop or beefy laptop that they're coding
> on, but then be super-slow on a user's mobile phone.
>

Not necessarily. Opting in could also mean you are opting into treating any
selectors belonging to the complete profile in the same way they would be
treated with @defer.
It all depends on what you name the flag, say "use-deferred-complete".


>
> ~TJ
>

Sorry Tab, forgot to CC the list. Is the formatting better now?