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Make it clear that quota is not supposed to be a function of availabl… #108

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Make it clear that quota is not supposed to be a function of availabl… #108

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Quota is not supposed to be a function of available space
annevk Jul 6, 2020
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annevk Jul 7, 2020
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22 changes: 14 additions & 8 deletions storage.bs
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Expand Up @@ -471,20 +471,26 @@ locally.

<h2 id=usage-and-quota>Usage and quota</h2>

<p>The <dfn export>storage usage</dfn> of a <a>storage shelf</a> is a rough estimate of the amount
of bytes used by it.
<p>The <dfn export>storage usage</dfn> of a <a>storage shelf</a> is an <a>implementation-defined</a>
rough estimate of the amount of bytes used by it.

<p class=note>This cannot be an exact amount as user agents might, and are encouraged to, use
deduplication, compression, and other techniques that obscure exactly how much bytes a
<a>storage shelf</a> uses.

<p>The <dfn export>storage quota</dfn> of a <a>storage shelf</a> is a conservative estimate of the
total amount of bytes it can hold. This amount should be less than the total available storage space
on the device to give users some wiggle room.
<p tracking-vector>The <dfn export>storage quota</dfn> of a <a>storage shelf</a> is an
<a>implementation-defined</a> conservative estimate of the total amount of bytes it can hold. This
amount should be less than the total storage space on the device. It must not be a function of the
available storage space on the device.

<p class=note>User agents are strongly encouraged to consider navigation frequency, recency of
visits, bookmarking, and <a href="#persistence">permission</a> for {{"persistent-storage"}} when
evaluating quotas.
<div class=note>
<p>User agents are strongly encouraged to consider navigation frequency, recency of visits,
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Putting "strong encouragements" in non-normative notes instead of as "shoulds" is a bit weird.

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Well, these are suggestions. They are not really directly observable so it seems weird to require them.

bookmarking, and <a href="#persistence">permission</a> for {{"persistent-storage"}} when
determining quotas.

<p>Directly or indirectly revealing available storage space can lead to fingerprinting and leaking
information outside the scope of the <a for=/>origin</a> involved.
</div>



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