Re: [w3c/permissions] Define a permission store (closes #384) (PR #390)

@johannhof commented on this pull request.



> +            Takes an [=environment settings object=], and returns a new [=permission key=].
+            If unspecified, this defaults to the <a>default permission key generation algorithm</a>.
+            A feature that specifies a custom [=powerful feature/permission key generation algorithm=] MUST also specify a
+            [=powerful feature/permission key comparison algorithm=].
+          </p>
+          <p>
+            The <dfn class="export">default permission key generation algorithm</dfn>,
+            given an [=environment settings object=] |settings|, runs the following steps:
+          </p>
+          <ol class="algorithm">
+            <li>
+              Return |settings|'s [=environment/top-level origin=].
+            </li>
+          </ol>
+          <aside class="note" title="Permission Delegation">
+            Most powerful features grant permission to the top-level origin and delegate access to the requesting document via [[[webappsec-permissions-policy]]].

Ah, thanks!

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