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In 4.2.21 "Callback function types", step 1 says: If the result of calling IsCallable(V) is false, then then throw a TypeError. Delete one occurrence of "then".
http://dev.w3.org/cvsweb/2006/webapi/WebIDL/Overview.xml.diff?r1=1.665;r2=1.666;f=h http://dev.w3.org/cvsweb/2006/webapi/WebIDL/v1.xml.diff?r1=1.106;r2=1.107;f=h