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

From: Tab Atkins Jr. <jackalmage@gmail.com>
Date: Tue, 11 Nov 2014 16:14:53 -0800
Message-ID: <CAAWBYDCJRyyGvVhfdADQ+csHfOK-HtVj-fE95Hoi5LTnOgyDOg@mail.gmail.com>
To: Benjamin Poulain <bpoulain@apple.com>
Cc: www-style list <www-style@w3.org>
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?

~TJ
Received on Wednesday, 12 November 2014 00:15:39 UTC

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