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Need to consider: - https://bugzilla.mozilla.org/show_bug.cgi?id=774769 - Certificate comparison - Origin comparison Also considering a URLHost object to expose all things IP addresses and domain names.
As far as I can tell the conclusion here is to define host equivalence as serializing hosts and comparing them. When it comes to domains (and maybe IPv6?) the trailing dot can be ignored only when it comes to certificates, because they are required to contain fully qualified domain names... It's a bit unclear how much of the domain terminology we want to define here.
https://github.com/whatwg/url/commit/5e903fee4b9a893c8236cf292a0d56a7254ee823 Per discussion in https://github.com/whatwg/url/issues/63 the URLHost concept is canned. It's probably not needed. The remark about IPv6 in the previous comment should be ignored.