Re: [w3c/permissions] Define permission lifetimes (#287)

@miketaylr commented on this pull request.

Looks pretty good to me, pending @jyasskin's comments.

> +                Every [=permission=] has a [=permission/lifetime=], which is the duration for which
+                a particular permission remains [=permission/granted=] before it reverts back to
+                its default [=permission state=]. The lifetime is negotiated between the end-user
+                and the [=user agent=] when the user gives [=express permission=] to use a
+                [=feature=] - usually via some permission UI or policy.
+              </p>
+              <p>
+                Specifications that identify themselves as a [=powerful feature=] SHOULD suggest a
+                [=permission=] [=permission/lifetime=] that is best suited for the particular
+                feature. Some guidance on determining the lifetime of a permission is noted below,
+                with a strong emphasis on user privacy. If no [=permission/lifetime=] is specified,
+                the user agent provides one.
+              </p>
+              <p>
+                When the permission [=permission/lifetime=] expires for an origin, and if there are
+                [=browsing contexts=] present pertaining to the [=permission=]'s associated origin,

I think we're trying to say, if you're the top-level browsing context for a given origin and have any ancestor browsing contexts, revoke  permission for all browsing contexts? I guess https://html.spec.whatwg.org/#nested-browsing-contexts gives you most of what you need.

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