Yes.  This is exactly the problem that isolated worlds is trying to
solve.  The implementation in the bindings to the V8 JavaScript engine
is complete.  I believe the implementation in the JavaScriptCore
bindings is complete as well.  You should look for some APIs with the
words "isolated" and "world" in their name.

If you'd like a high-level explanation of what this feature does, see
Section 4.3 of 
http://www.adambarth.com/papers/2010/barth-felt-saxena-boodman.pdf
(particularly the paragraph named "isolated worlds").

Enjoy!

Adam


On Mon, Jan 4, 2010 at 9:57 AM, Darin Adler <[email protected]> wrote:
> WebKit contributors have developed a feature called “isolated worlds” to 
> handle requirements like this.
>
> But I don’t know where we are in the implementation of that feature. Perhaps 
> one of the people working on isolated worlds could comment on its current 
> status.
>
>    -- Darin
>
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