Re: [whatwg/url] Define hosts' public suffix and registrable domain. (#391)

sleevi commented on this pull request.



> @@ -272,6 +272,93 @@ for further processing.
 U+0020 SPACE, U+0023 (#), U+0025 (%), U+002F (/), U+003A (:), U+003F (?), U+0040 (@), U+005B ([),
 U+005C (\), or U+005D (]).
 
+<p>A <a for=/>host</a>'s <dfn for=host export id=concept-host-public-suffix>public suffix</dfn> is
+the portion of a <a for=/>host</a> which is controlled by a registrar, public or otherwise. To

@mikewest Yeah, except neither GitHub nor Google are actually or acting as registrars. That was why it was sort of weird. They don't necessarily allow registration either (and may instead assign names, such as Amazon, based on project IDs)

For a given domain input, the PSL splits the labels on the first administrative boundary, with the registered domain being the set of labels that are operated according to a different set of domain policies than the public suffix (which itself may contain more domain splits).

Definitely a mouthful, and this is part of why we dance around it on publicsuffix.org, because we haven't found a pithy way of describing left/right except in their relationship to each other. :/

I was hoping your ability to condense these concepts would be better than mine.

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