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Re: [css-images][selectors][css21] ::before and ::after on replaced elements

From: Tab Atkins Jr. <jackalmage@gmail.com>
Date: Thu, 21 Aug 2014 17:05:19 -0700
Message-ID: <CAAWBYDAW2i_Xj3RwwdLiqSqzLZ-=HyM0ycAhsT0uVBP+ES0efg@mail.gmail.com>
To: Florian Rivoal <florian@rivoal.net>
Cc: www-style list <www-style@w3.org>
On Thu, Aug 21, 2014 at 3:40 PM, Florian Rivoal <florian@rivoal.net> wrote:
> On Fri, 22 Aug 2014 00:21:10 +0200, Tab Atkins Jr. <jackalmage@gmail.com>
> wrote:
>> While we definitely need to figure out something for this eventually,
>> reinterpreting ::before/after as siblings is definitely not the right
>> idea.  We'll likely eventually add something that adds siblings for
>> all elements.
>
> So we should:
> (1) stick to the fact that ::before/::after on replaced elements do nothing
> and
> (2) eventually spec something like ::sibling-before/::sibling-after
>
> That would make sense to me, and I don't see any reason to wait to put (1)
> in a spec explicitly. Since the selector spec is the one refering to 2.1,
> which says we will eventually say how this work, it looks like a good
> place for a clarification. How about this at the end of section 3.7:
>
>   Note. Since ::before and ::after add children to the originating
>   element, they have no effect on replaced elements such as the HTML img
>   element.

The reason we haven't done this yet is that browsers aren't that
simple.  We have "semi-replaced" elements, such as form inputs, which
are considered "replaced" by CSS, but which react to styling as if
they had children in several browsers.  In particular, most inputs
allow ::before/::after to be used.

Once we come up with a story for form styling, such that we can
actually define the set of "really replaced" elements, I'm happy to
add wording that says that ::before and ::after don't apply to them.

~TJ
Received on Friday, 22 August 2014 00:06:06 UTC

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