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The accordion is a graphical control element comprising a vertically stacked list of items, such as labels or thumbnails. Each item can be "expanded" or "collapsed" to reveal the content associated with that item. There can be zero expanded items, exactly one, or more than one item expanded at a time, depending on the configuration.
The term stems from the musical accordion in which sections of the bellows can be expanded by pulling outward.
A common example of an accordion is the Show/Hide operation of a box region, but extended to have multiple sections in a list.
Several windows are stacked on each other. All of them are "shaded", so only their captions are visible. If one of them is clicked, to make it active, it is "unshaded" or "maximized". Other windows in accordion are displaced around top or bottom edge.
A common example using a GUI accordion is the Show/Hide operation of a box region, but extended to have multiple sections in a list.
SlideVerse is an accordion interface providing access to web content.
The list view of Google Reader also features this.
Apple has some roll-over accordions.[not specific enough to verify] For example (as of December 2008[update]), the left column of the page includes three categories that expand on roll-over: "All Downloads", "Top Apple Downloads", and "Top Downloads".