Removes an event listener that has been added using addEventListenerTo.
IMPORTANT: If you have added a listener using the built-in EventTarget:addEventListener, then you should use EventTarget:removeEventListener, to remove it, not this function.
true if successfully removed, or false if the handler has not been added by us.
true
false
Removes an event listener that has been added using addEventListenerTo.
IMPORTANT: If you have added a listener using the built-in EventTarget:addEventListener, then you should use EventTarget:removeEventListener, to remove it, not this function.