Re: [selectors] Matching of :first-child and the like for elements whose parent is not an element

Le 18/03/2013 19:48, Boris Zbarsky a écrit :
> The selectors spec says, at
> http://dev.w3.org/csswg/selectors4/#the-first-child-pseudo  :
>
>     The :first-child pseudo-class represents an element that is the first
>     child of some other element.
>
> and similar for other structural pseudo-classes.
>
> On the face of it that means such selectors never match root elements or
> children of document fragments.
>
> Is this restriction purposeful?  It seems like sane structural
> pseudo-class matching (e.g. nth-of-type) might be desirable with
> querySelector on DocumentFragment at the very least...

It seems to be on purpose, yes.

:first-child is "Same as :nth-child(1)", and :nth-child(an+b) 
"represents an element that has an+b-1 siblings […], **and has a parent 
element**."

(emphasis added.)

I personally don’t really care either way, but it’s been explicitly 
defined that way for a long time…

-- 
Simon Sapin

Received on Monday, 18 March 2013 19:19:00 UTC