object.addEventListener(eventType, functionCall, downBool)

• eventType is the type of the event you want to listen to. Do not include the "on" prefix. Examples: "mouseover", "click", "mouseout", "mouseup", and "mousedown".
• functionCall is the function you want to execute when the event is detected. This is the actual function reference and not a string, so don't include the function name in quotes. If you need to pass parameters to the function, simply pass them in this call, as functionName(param1, param2).
• downBool is a Boolean variable (true or false) that tells the listener on which phase to intercept the event. A true value asks the listener to intercept the event on its way down from the browser window object to its target object (capture phase). A false value signals the listener to intercept it on its way up from the target object to the window object (bubbling phase).

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