[whatwg] How long should sessionStorage data persist?

Jeremy Orlow jorlow at google.com
Fri Apr 3 19:52:44 PDT 2009

I think this also applies: "NOTE: The lifetime of a browsing context can be
unrelated to the lifetime of the actual user agent process itself, as the
user agent may support resuming sessions after a restart."

On Fri, Apr 3, 2009 at 6:46 PM, Ian Hickson <ian at hixie.ch> wrote:

> On Fri, 3 Apr 2009, Boris Zbarsky wrote:
> > Ian Hickson wrote:
> > > The term "browsing context" in the spec basically corresponds to the
> > > session history exposed by window.history, and the outer "Window"
> > > object that the history is on.
> >
> > How should this behave in a situation like Firefox's "undo close tab",
> > where the resulting tab has a brand-new window object but the
> > window.history has been deserialized from a string representation.  So
> > it's a new object, but has the same information in it as the old one
> > used to.
> >
> > Presumably in such a case this should be treated as "the same" browsing
> > context in spite of the Window object being totally different?
> >From the HTML5 spec's point of view, that's a new browsing context.
> There's a 1:1 mapping from "browsing context" to "outer Window" (called
> WindowProxy in the spec).
> However, the Web Storage spec allows for this case:
> | When a new top-level browsing context is created by cloning an existing
> | browsing context, the new browsing context must start with the same
> | session storage areas as the original, but the two sets must from that
> | point on be considered separate, not affecting each other in any way.
> This was originally intended to cover IE's "open new window"
> functionality, which options a new window with a cloned session history,
> but "Undo close tab" should be considered a case of cloning a browsing
> context too. It just happens that the underlying browsing context is no
> longer accessible from script.
> --
> Ian Hickson               U+1047E                )\._.,--....,'``.    fL
> http://ln.hixie.ch/       U+263A                /,   _.. \   _\  ;`._ ,.
> Things that are impossible just take longer.   `._.-(,_..'--(,_..'`-.;.'
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