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Implementations I tested just now (Firefox, Safari, Chrome, Opera) all enumerate properties corresponding to DOM methods. http://people.mozilla.org/~cmccormack/tests/enum-htmlelement.html I think the spec says for them to be [[Enumerable]]:false for consistency with built-in objects in ES, but people probably rely on them being enumerable on DOM objects.
Done: http://dev.w3.org/cvsweb/2006/webapi/WebIDL/Overview.html.diff?r1=1.258;r2=1.259;f=h