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Re: [selectors-api] some doubts

From: Joćo Eiras <joao.eiras@gmail.com>
Date: Fri, 09 May 2008 02:06:03 +0100
To: "Lachlan Hunt" <lachlan.hunt@lachy.id.au>
Cc: "Web APIs WG" <public-webapi@w3.org>
Message-ID: <op.uau30dcijz3wb9@foobar.wag54gs>


Ok, then issue 1 is unresolved. I like the :scope idea, but then the UA  
could imply :scope before each selector.

Thank you all.


Na , Lachlan Hunt <lachlan.hunt@lachy.id.au> escreveu:

> Joćo Eiras wrote:
>> 1) How do we deal with node.querySelectorAll(">foo") ?
>>  should this be considered a valid selector and return children of the  
>> context node with nodeName equal foo ?
>>  This is a valid use case, and widely used and supported by existing  
>> libraries.
>
> It's an invalid selector, but we're trying to find a solution to cover  
> the use case.  There has been some recent discussion about this.  For  
> more info about the current status, see these posts.
>
> http://lists.w3.org/Archives/Public/public-webapi/2008May/0057.html
> http://lists.w3.org/Archives/Public/public-webapi/2008May/0058.html
>
>> 2) How should following pseudo-classes be handled?
>>  :hover -> make this use case clear. Should hovered element be matched,  
>> or the class ignored ?
>
> It will match, but since the NodeList returned is static, the list won't  
> change dynamically as the user moves the cursor around.
>
>>  :root -> should node.querySelectorAll(":root ...") jump to the  
>> document root and use the entire document as context ?
>
> As currently defined, all selectors are evaluated against the element in  
> the context of the entire document.  So, yes, ":root ..." will match  
> appropriate elements if they are contained within the document.  If it's  
> a disconnected subtree or document fragment, there is no root element  
> that matches :root, and so it won't match.
>
>> 3) How should pseudo-elements be handled ?
>>  ::first-line
>>  ::first-letter
>>  ::selection
>>  ::before
>>  ::after pseudo-elements
>>  none of these elements are visible to the DOM, and ::selection  
>> contains a too complex data structure which cannot be represented with  
>> a NodeList.
>
> Pesudo-elements won't match anything. There's a note in the spec about  
> that that says the following:
>
> "Authors are advised that while the use of pseudo-elements in selectors  
> is permitted, they will not match any elements in the document, and thus  
> would not result in any elements being returned. Therefore, authors  
> should avoid the use of pseudo-elements in selectors that are passed to  
> the methods defined in this specification. "
>
Received on Friday, 9 May 2008 01:19:08 GMT

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