[whatwg] How long should sessionStorage data persist?

[Jeremy Orlow]

I created a page that sets a variable in sessionStorage, then I navigated to
a different domain, then I went back to the page and checked if the variable
was still set.  In Safari 4 (beta) it is.  In IE8 it isn't.
The spec is not terribly clear: "When a top-level browsing context is
destroyed (and therefore permanently inaccessible to the user) the data
stored in its session storage areas can be discarded with it, as the API
described in this specification provides no way for that data to ever be
subsequently retrieved."

Can anyone explain what's intended here?  If not, can the spec make it more
clear?

Jeremy
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