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

@johannhof commented on this pull request.



> +        </h3>
+        <p>
+        The user agent maintains a single <dfn class="export">global permission store</dfn> which is a list of [=permission store entries=].
+        The user agent removes [=entries=] from the list when their respective [=permission=]'s [=permission/lifetime=] has expired.
+        </p>
+        <p class="issue">
+        We should still allow UAs flexibility in giving out permissions with smaller scope and lifetime (e.g. per-tab) in some form. There should generally still be enough room for exploration here.
+        </p>
+        <p>
+        A <dfn class="export" data-local-lt="entry">permission store entry</dfn> is a [=tuple=] of [=powerful feature/name=] name, [=permission store key=] key, {{PermissionDescriptor}} descriptor, and [=permission/state=] state.
+        </p>
+        <p>
+        To <dfn class="export">get a permission store entry</dfn> from the [=global permission store=] given a |name|, [=permission store key=] key and descriptor, run these steps:
+        <ol class="algorithm">
+          <li>
+          If the [=global permission store=] [=list/contains=] an [=entry=] with the name |name|, the key |key| and the descriptor |descriptor|, return that entry.

PermissionDescriptor is a WebIDL dictionary and might have descendants which are also dictionaries: https://www.w3.org/TR/permissions/#aspects

I would hope/assume that this enables us to compare these?

I wasn't sure whether it's needed for `key` but I can see why it makes sense to have it.

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