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

Back to the issue, the question is how this could flow back to the WHATWG standard. And I am not really sure how that would work yet. The parser algorithm seems to be the heart of the standard, and I think there is a lot of work behind that. There is of course the section on URL Writing which does look like a grammar in prose style. 

To be clear, what I tried to do, and what I suspect people in this thread (and alike) are after _is not_ to give a grammar for valid URL strings (like in the URL writing section), but to give one that describes the language of URLs that is implicitly defined by the parser algorithm – and in such a way that it also describes their internal structure. Then the grammar contains all the information that you need for building a parser. This is indeed possible, but it is a large change from the standard as it is now. 

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