>From the spec... 4.2.1. Interface object
The interface object for a particular interface has an internal [[Prototype]] object whose value is the Object prototype object. >> So, can infer that the interface object (lets use HTMLDocument) *is an* >> Object? Or is it a Function? >> ("object" == typeof HTMLDocument) ? "It's an object" : ("function" == typeof >> HTMLDocument) ? "It's a function" : "What is it?"; >> I see that browsers disagree and that FF3 B4 recently changed to be >> 'object'. Leaving Opera in the wrong?