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

pedantry:
> which is controlled by a registrar

Isn't necessarily correct. This implies control over the DNS, which isn't always passed on (e.g. in the cast of hosting or DNS providers), and an example like `appspot.com`, that domain isn't controlled by a registrar.

That was the intent of the PSL originally - reflecting ccTLDs registration policies - but that predates the advent of the PRIVATE section where it all began the descent into hell :)

`publicsuffix.org` doesn't list 'what' a public suffix is, other than the result of running the algorithm. Logically, it represents the separation of domain boundaries indicating a change in administrative or technical control or security policy (which is why IETF called it DBOUND), but that's a bit of a mouthful... :/

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