Re: [whatwg/url] Provide a succinct grammar for valid URL strings (#479)

Interesting, I did not know that there were parser generators that support parameterised rules. 

I did consider a more formal presentation with subscripted rules, but then I backed off because I thought it would be less accessible. It makes me think of higher order grammars, and I think that's too heavy. I guess in this case it could result in something quite readable too though. 

As for the comparison with RFC 3986, it would be great if this can help to point out the differences. I have not looked into that much, but the good news is that it might not be _that_ different, after all. 
I couldn't start with the RFC though because I was specifically aiming for the WHATWG standard. That was motivated by an assumption that this is the common URL standard, in part because It does mention obsoleting RFC 3986 and RFC 3987 as a goal. 

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