Re: Selector parsing: It's easy to hit unexpected unicode-range tokens

On 30/06/14 15:34, Boris Zbarsky wrote:
> This came up in https://bugzilla.mozilla.org/show_bug.cgi?id=1032034
>
> Consider this rule:
>
>     #nav u+a { background: yellow; }

The person who reported the original bug also mentioned CSS minifiers 
that automatically remove whitespace, so this looks more common that I 
first thought.

> [...]
>
> It seems to me like either we should not have a separate unicode-range
> token and instead handle unicode ranges on the parser level or we should
> have some sort of special token reprocessing logic in the selector
> parser.  My preference is very much for the former.

I think we can do the former with a definition similar to this 
definition of <An+B> (the argument to :nth-child())

http://dev.w3.org/csswg/css-syntax/#the-anb-type

It’s ugly, but it’s well-defined and it seems to be the "least worst" we 
can do here.

-- 
Simon Sapin