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

Where is it defined that a URL must contain a scheme and a host in order to be a valid URL?

Even if such a definition exists, `new URL()` is the first API in the web ecosystem that I have encountered that has this limitation, making it quite surprising.

Beyond that, the WHATWG URL spec itself defines relative URLs...

https://url.spec.whatwg.org/#relative-url-string

As for existing implementations, see Node's `url.parse()` and `url.resolve()`, among others. I've used these extensively to manipulate URLs where the scheme and/or host is not known ahead of time and will be determined later by the end-user or browser, depending on where the URL is ultimately used.

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