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In 4.6.4. "Platform object [[Delete]] method", step 2.1 says: If O does not to implement an interface with a named property deleter, ... Delete "to".
http://dev.w3.org/cvsweb/2006/webapi/WebIDL/Overview.xml.diff?r1=1.670;r2=1.671;f=h http://dev.w3.org/cvsweb/2006/webapi/WebIDL/v1.xml.diff?r1=1.111;r2=1.112;f=h