Two IDL files are missing, thus the JS binding of these objects will fail.
(In reply to comment #1)
> Which two?!
Heh this was in the bug title before! I asked Adam to change it, and forgot to list them here :-)
SVGMPathElement.idl & SVGAnimateMotionElement.idl IIRC
Reni, did you want to add those two and enable their constructors in DOMWindow.idl?
The suggested IDL's are in WebCore. Should some IDLs still be missing, open a bug report for each IDL or a combination of IDL by name please.