Re: [css3-regions] can ::before/::after become a CSS Region?

On 11/6/12 8:02 PM, "Kang-Hao (Kenny) Lu" <kanghaol@oupeng.com> wrote:

>Thanks! That would make it a lot clearer. I am going to be a bit more
>picky however..
>
>(12/11/07 11:29), Alan Stearns wrote:
>> Yes, the spec should say something about this. There's some text in
>> css4-pseudo [1] that's meant to describe this change:
>> 
>> ---
>> A CSS rule using ::before or ::after creates a pseudo-element
>> only if the computed values of the Œcontent¹ property
>> and the Œflow-from¹ property [CSS3-REGIONS] are not both Œnone¹.
>> ---
>> Block container pseudo-elements where the value of ¹flow-from'
>> computes to an <ident> and the value of Œcontent¹ computes to
>> Œnone¹ are generated as CSS Regions, which is an update to the
>> behavior described in [CSS21].
>> ---
>
>These two sentences give me two different results for a case like:
>
>  span::before { display: inline; flow-from: test; counter-reset: x 10;
>} span::after { content: counter(x); }
>
>The former suggests "10" and the latter suggests "0".

Yes. Please take the sentence in css4-pseudo as incomplete. It should have
a clause about needing to be a block container for flow-from to be
relevant. Since the ::before pseudo-element does not become a CSS Region
in this case it is not generated and the result should be "0".

>Also, what should
>happen for a case like
>
>
>  span::before { display: block; flow-from: test; flow-into: test;
>counter-reset: x 10; } span::after { content: counter(x); }
>
>Again the former suggests "10" and I can't really tell what the latter
>is suggesting.

(I changed display to block based on your correction)

In this case, flow-into is ignored as it does not apply to ::before
pseudo-elements, so there is not a circular dependency. So the result
should be "10".

Thanks,

Alan

(by the way, I very much appreciate your detailed read of CSS Regions in
the separate long post. I am going to be mostly away from email for the
next two days, so I'm unfortunately not going to be able to respond to it
until Friday this week)