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Custom pseudo-elements collisions, was: Need a better way to reach into the shadow DOM subtree

From: Dimitri Glazkov <dglazkov@google.com>
Date: Tue, 23 Oct 2012 12:58:40 -0700
Message-ID: <CADh5Ky2=Hb0VnQy8AymE3Mw=0o0_gYdQnaOa8Z30oa9i=ekpSg@mail.gmail.com>
To: David Hyatt <hyatt@apple.com>
Cc: "www-style@w3.org" <www-style@w3.org>, Tab Atkins <tabatkins@google.com>
Folks,

I am re-visiting this -- time to add custom pseudo-elements to Shadow
DOM spec! -- and would like to solicit ideas/opinions on the topic of
collisions. Specifically, What I am trying to avoid here is collisions
between some widget author-invented pseudo-element name with something
the CSS WG invents in a future specification.

Possible solutions:

1) Introduce a "::pseudo(name)" pseudo-element specifically for custom
pseudo-elements (Tab's idea)

2) Place a validity constraint on the pseudo-element value. For
example, it has to start with "x-".

3) your idea goes here.

:DG<

On Wed, Apr 27, 2011 at 1:33 PM, Dimitri Glazkov <dglazkov@google.com> wrote:
> As of http://trac.webkit.org/changeset/85077, the restrictions on
> pseudo-elements are relaxed and allow chaining pseudo-elements and
> pseudo-classes at will.
>
> :DG<
>
> On Mon, Apr 11, 2011 at 12:59 PM, David Hyatt <hyatt@apple.com> wrote:
>> On Apr 11, 2011, at 2:50 PM, Dimitri Glazkov wrote:
>>
>>> video::-webkit-timeline:disabled { /* ... */ }
>>>
>>> How do we fix this? Tab suggests a new combinator selector like:
>>
>> Just keep using pseudo-elements, but lift all the silly restrictions placed on them, e.g., that they have to be the rightmost selector.  The issue isn't with pseudo-elements.  The issue is with the restrictions placed on pseudo-element usage that don't need to be there.
>>
>> Note that WebKit already has its own pseudo-element extensions that deliberately violate this rule, e.g., all of the scrollbar parts, which support states like hover/active/disabled using rules just like what you've described above.
>>
>> dave
>> (hyatt@apple.com)
>>
>>
Received on Tuesday, 23 October 2012 19:59:02 GMT

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