> that XMLHttpRequest.open(...) are disallowed if they target 
> for another domain, than the one the document is in?
> Like disallowing cross-site calls?

Yes, to avoid cross-site scripting attacks; remember Javascript has
globally accessible objects so if cross-site scripting was allowed then
an attacker could make a script which went through the browser's open
documents looking for a particular library and modify that.

Presumably a signed Javascript will be allowed to perform a cross-site
connection.

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