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Re: [selectors4][css3-syntax] an+b corner case

From: Kang-Hao (Kenny) Lu <kennyluck@csail.mit.edu>
Date: Tue, 01 May 2012 01:53:12 +0800
Message-ID: <4F9ED188.3060305@csail.mit.edu>
To: WWW Style <www-style@w3.org>
(12/05/01 1:23), Boris Zbarsky wrote:
> On 4/30/12 12:56 PM, Tab Atkins Jr. wrote:
> And for what it's worth, it's even worse.  To quote the Gecko source
> comments from parsing this stuff:
>  // The CSS tokenization doesn't handle :nth-child() containing - well:
>  //   2n-1 is a dimension
>  //   n-1 is an identifier
> (And on a personal note, I'd like to point out that "-n-5" is likewise
> an IDENT token in the tokenizer.  Yay overloading of hyphen and minus!)


> [pseudo code snipped]
> The end result is that Gecko allows comments or whitespace _after_ the
> 'n', and in cases when the 'n' is followed by a '-' makes the behavior
> as if there had in fact been a comment or whitespace between them.  But
> no comments or whitespace before the "n" allowed: that ends up falling
> into the t.isInteger() case above.  This could probably be fixed if it
> were really necessary, but I question how necessary it is, since no UA
> actually does that.  Fixing the spec would be preferable.

Agreed. I am all for reducing unnecessary codes in browsers and I care
much less about the size of the spec. :p

I think this prose should be written to have a dependency on css3-syntax
or perhaps css3-syntax could just take over it.

Received on Monday, 30 April 2012 17:53:39 UTC

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