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Re: [selectors] Proposal: :only-of(selector list)

From: Benjamin Poulain <benjamin@webkit.org>
Date: Wed, 12 Nov 2014 20:30:34 -0800
Message-ID: <546433EA.5070700@webkit.org>
To: www-style@w3.org
On 11/11/14 4:14 PM, Tab Atkins Jr. wrote:
> On Mon, Nov 10, 2014 at 8:40 PM, Benjamin Poulain <bpoulain@apple.com> wrote:
>> It looks like it would be useful to include :only-of(selector list) in Selectors Level 4.
>> It is already possible to achieve the same behavior by using :nth-child(1 of selector list):nth-last-child(1 of selector list) but that is significantly uglier. Repeating the selector list is error prone when updating the stylesheet and the specificity is doubled.
>> The selector :only-of(selector list) would behave like :nth-child(1 of selector list):nth-last-child(1 of selector list) but with lower specificity (accounting for the selector list once instead of duplicating it). The definition of :only-of-type is pretty much the same.
>> The implementation is trivial based on the existing :nth-child() and :nth-last-child(). The single :only-of() is likely to be more efficient than :nth-child():nth-last-child() in most implementations.
> Do you have some use-cases to share that would use this?

Pretty much the same uses use cases of :only-of-type and :only-child 
exists for :only-of.

Many designs are based on classes or data attributes. Having 
:only-of-type does not help in those cases.

Received on Thursday, 13 November 2014 04:33:57 UTC

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