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

sleevi commented on this pull request.



> @@ -272,6 +272,94 @@ 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>public suffix</dfn> is the portion of a
+<a for=/>host</a> which is controlled by a registrar, public or otherwise. To obtain
+<var>host</var>'s <a for=host>public suffix</a>, run these steps:
+
+<ol>
+ <li><p>If <var>host</var> is not a <a>domain</a>, then return null.
+
+ <li><p>Return the <a for=host>public suffix</a> obtained by executing the
+ <a href="https://publicsuffix.org/list/">algorithm</a> defined by the Public Suffix List on
+ <var>host</var>. [[!PSL]].
+</ol>
+
+<p>A <a for=/>host</a>'s <dfn for=host export>registrable domain</dfn> is a <a>domain</a> that could
+be registered at a registry. To obtain <var>host</var>'s <a for=host>registrable domain</a>, run

I’d need to reaudit the Chrome code to figure out which cases are web visible. The results differ in this case based on whether or not you include private suffices and whether you treat wildcards as implicit entries of the parent. Chrome and FF differ on the latter, and the former is specified by the caller.

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