[whatwg] localStorage behavior when cookies mode is session-only

Jeremy Orlow jorlow at google.com
Wed Jun 3 14:00:27 PDT 2009

On Wed, Jun 3, 2009 at 1:15 PM, Ian Hickson <ian at hixie.ch> wrote:

> On Thu, 9 Apr 2009, Honza Bambas wrote:
> >
> > In the W3C spec for localStorage
> > http://dev.w3.org/html5/webstorage/#the-localstorage-attribute is said
> > to present it (the persistent storage) the same way as cookies.
> >
> > There were suggestion to throw DOM_QUOTA_ERROR exception when storing to
> > localStorage in case when cookies are in a session-only mode for a
> > host/page. It makes sense from several reasons. This way web apps may
> > decide or inform user about situation that the page cannot store to
> > localStorage while there is no way for the page to figure out that
> > cookies mode is session-only and web app still may freely read from the
> > storage.
> >
> > My suggestion is then:
> > - allow a page to obtain valid localStorage object
> > - allow read from it
> > - throw DOM_QUOTA_ERROR when storing to it
> >
> > But I don't know what to do in case of call to clear() and removeItem()
> > methods. It would exposes the cookie behavior again when it
> > fails/throws.
> Wouldn't it be best for the UA to store the data as normal, and report to
> the user in some informative messages somewhere in the interface that data
> has been stored but will be discarded? (The UA could even offer to save
> it, in fact.)

This seems sane, but it definitely doesn't fit into Apple's "private
browsing" model, as far as I understand it.
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