[selectors-api] Return value of lookupNamespaceURI

If the return value of lookupNamespaceURI is |undefined|, should that 
stringify to "" or "undefined"?  Same question for |null|.

Note that I'm not sure there's an obvious way to annotate this in web 
idl yet.

-Boris

Received on Friday, 11 July 2008 23:48:35 UTC