https://bugzilla.mozilla.org/show_bug.cgi?id=264525
We need HTMLNode.getSupportedEvents() ==> returns a text array of event names HTMLNode.isSupportedEvent(eventName) ==> returns true/false Many times in particular version of browser we dont know whether an HTMLNode/window support particular event. Or what are the alternate events available, so that we can refer some document or do some test to find how it can be used. So I wish we had above methods available.
