Boris Zbarsky:
Per the current spec proposal, the GSP lives on the proto chain and exposes the various id/name stuff as own properties on itself, with the usual caveats about checking up the proto chain first that DOM named access has. See http://dev.w3.org/2006/webapi/WebIDL/#NamedPropertiesObject (which Window uses). There was a bunch of previous discussion about this at http://lists.w3.org/Archives/Public/public-script-coord/2012JanMar/0010.html and following, though it's not clear to me now whether the solution we decided on allows var to shadow these named props as desired after all...
I think it should, since they're exposed as data properties on the named properties object.
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