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

It's unclear if people here are aware, but the spec already gives a succinct grammar-like definition of "valid URL": see https://url.spec.whatwg.org/#url-writing . That is what [the first reply comment in this thread](https://github.com/whatwg/url/issues/479#issuecomment-619261520) was asking about.

Note that, as explained in https://url.spec.whatwg.org/#writing , this is unrelated to what URLs are accepted by software, because software needs to parse URLs, not just perform the `string -> boolean` validation algorithm which grammars enable. But might be useful or interesting for some of the people who have been commenting recently; I'm not sure.

(However, there's a long-standing issue that the spec actually provides *two* ways of determining whether an input string is valid or not, and it seems unlikely to me that they are the same... I've just opened a tracking issue for that at https://github.com/whatwg/url/issues/704.)

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