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Re: ::distributed and relative selectors (Was Re: [shadowdom]: Using :root to specify the insertion point in ::distributed)

From: Tab Atkins Jr. <jackalmage@gmail.com>
Date: Thu, 18 Apr 2013 10:44:22 -0700
Message-ID: <CAAWBYDAdEqG31-9FUYBZp7y5bjAszSS7-8-DZwS4szSfE8zULQ@mail.gmail.com>
To: Hayato Ito <hayato@google.com>
Cc: Dimitri Glazkov <dglazkov@google.com>, fantasai <fantasai.lists@inkedblade.net>, "www-style@w3.org" <www-style@w3.org>
On Thu, Apr 18, 2013 at 1:44 AM, Hayato Ito <hayato@google.com> wrote:
> The subject was changed.
> On Wed, Apr 3, 2013 at 9:01 AM, Tab Atkins Jr. <jackalmage@gmail.com> wrote:
>> On Tue, Apr 2, 2013 at 3:01 PM, Dimitri Glazkov <dglazkov@google.com> wrote:
>>> Using scope-relative approach (which I love), what does
>>> ::distributed(:scope) represent?
>>
>> Nothing.  The scope element is a theoretical construct here
>> representing a container for all the distributed elements, not a real
>> element that you can do something with.
>
> I am now implementing relative selectors in blink.
> As the first usecase of relative selectors, I've tried to use it in
> '::distributed(..)' pseudo elements.
>
> Now I have a question. Let me use the following deduction:
>
> 1). content::distributed(> .hello)               ->  Please assume this matches.
> 2). content::distributed(:scope > .hello)        -> Matches. (1 and 2
> should be equivalent acccording to the defintion of relative
> selectors).
> 3). content::distributed(*:scope > .hello)       -> Matches.
> 4). content::distributed(content:scope > .hello) -> Matches.
> 5). content::distributed(content > .hello)       -> Should not match.

I think that, for the purpose of ::distributed, the scope element
should be an abstract container, not the actual <content> element.
This container would act as an element for the purposes of selectors,
but it has no tagname or any other quality to select on.  So, #1, #2,
and #3 would match, but #4 and #5 wouldn't, because the scoping
element isn't named "content".

Alternately, we *could* do as you suggest and make the match/doesn't
match split between #1 and #2, saying that the abstract container
isn't an element at all and can't be selected.  But I think that's
less natural.

~TJ
Received on Thursday, 18 April 2013 17:45:09 UTC

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