Re: [whatwg/url] Support relative URLs (#531)

Yeah I think the term "relative URL" is not really helpful, and we should instead call it a "relative reference". As per this standard, URLs are always absolute - and you can resolve a relative reference against one to end up with a new URL (also absolute).

A relative reference (like `../../foo`) can be thought of as something like "x's brother's best-friend's sister's husband". You need to substitute in a specific person for "x" in to order to resolve it in to another specific person. Or you could think of it like a set of directions - "take the next right". In order to know which street that refers to, you need a starting position.

And the idea behind having a separate type for these things is that tools designed to work with references to specific people/addresses are not necessarily the best tools for working with those kinds of abstract, relative references. Trying to write a single API which somehow magically works with both is likely to be bug-prone, and the result would be difficult to use.

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