The EventTarget method addEventListener() sets up a function that will be called whenever the specified event is delivered to the target. Common targets are Element, Document, and Window, but the target may be any object that supports events (such as XMLH

A common mistake for new JavaScript programmers is to extract a method from an object, then to later call that function and expect it to use the original object as its this (e.g., by using the method in callback-based code). Without special care, however,

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