Re: [css-syntax] <an+b> grammar

I’m not convinced that it’s that hard to make the grammar effectively 
the same as what Selectors 3 defines, even if it means handling 
whitespace tokens explicitly. Also, I remember that we should give 
priority to making things convenient to users first, then authors, then 
implementers, and only then spec editors (although I don’t have the 
reference at hand.)

That said, I’m not opposed to this change, although I’d prefer something 
where '+' and '-' behave the same, as David says.

-- 
Simon Sapin