Introduced in DOM Level 2
The EventListener interface is the primary method for handling events.
Users implement the EventListener interface and register their listener on
an EventTarget using the AddEventListener method. The users should also
remove their EventListener from its EventTarget after they have completed
using the listener.
When a Node is copied using the cloneNode method the EventListeners attached
to the source Node are not attached to the copied Node. If the user wishes
the same EventListeners to be added to the newly created copy the user must
add them manually.
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