Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A disclosure widget or expander is a graphical user interface element (widget) that is used to show or hide a collection of "child" widgets in a specific area of the interface. The widget hides non-essential settings or information and thus makes the dialog less cluttered. The disclosure widget may be expanded or collapsed by the user; when this occurs, the containing window may be expanded to accommodate the increased space requirement. The state of the widget is often signified by a label with a triangle next to it, pointing sideways when it is collapsed and downward when it is expanded (corresponding to the widget's current state), or a button with an arrow pointing downward when it is collapsed and upward when it is expanded (corresponding to how the widget will change state if the button is clicked).

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