I have a question about removing markers.

when setMap(null) is used, is the marker actually removed from the dom
or is it just hidden?

For several placemarks are there several event dom listeners set up?
Or is there a single map event listener that inspects the event to see
if it originates from a placemark object?

Also are any event listeners associated with the object removed when
setMap(null) is used? or does one need to keep track of events and
remove them using removeListener?

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