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((short description|Expandable GUI element containing vertically stacked list of items))
((more citations needed|date=September 2014))
[[File:Free psd ui kit sleek accordion menu by melaychie-d5fb2d9.png|thumb|Accordion widget]]

The '''accordion''' is a [[graphical control element]] comprising a vertically stacked list of items, such as labels or [[thumbnail]]s. 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 [[Inference|operation]] of a box region, but extended to have multiple sections in a list.

An accordion is similar in purpose to a [[tabbed interface]], a list of items where exactly one item is expanded into a [[Panel (computer software)|panel]] (i.e. list items are [[File shortcut|shortcut]]s to access separate panels).

==User definition==
Several windows are stacked on each other. All of them are "[[WindowShade|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.

==Examples==
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.<ref>((cite web|url=http://hypotext.webs.com/slideverse.htm |title=SlideVerse - A Different Look at the Internet |accessdate=2008-10-25 |url-status=dead |archiveurl=https://web.archive.org/web/20090203043904/http://hypotext.webs.com/slideverse.htm |archivedate=2009-02-03 ))</ref>

The list view of [[Google Reader]] also features this.

In an early example, Apple's download page used roll-over accordions in 2008. In this example, captured in the [[Wayback Machine]] in the [[Internet Archive]], the left column of the page includes three categories that expand on roll-over: "All Downloads", "Top Apple Downloads", and "Top Downloads".<ref>((cite web |url=https://www.apple.com/downloads/ |title=Apple - Downloads |website=www.apple.com |access-date=12 January 2022 |archive-url=https://web.archive.org/web/20080430124840/https://www.apple.com/downloads/ |archive-date=30 April 2008 |url-status=dead))</ref>

==See also==
*[[Code folding]], a similar technique applied to text

==References==
((Reflist))

==External links==
*[http://jqueryui.com/demos/accordion jQuery UI accordion widget]
*[https://web.archive.org/web/20070503050709/http://www.yourhead.com/accordion/index.html YourHead]
*[https://web.archive.org/web/20111008042954/http://mootools.net/demos/?demo=Accordion mootools] Tutorial (where the effect is called ''sliding shelf'') on [https://web.archive.org/web/20070524055359/http://www.monfx.com/journal/2006/08/01/sliding-ajax-shelf-the-code-behind-the-mask/ MONFX]
*[https://web.archive.org/web/20070602102134/http://www.ajaxdaddy.com/demo-interface-accordion.html Accordion Interface] Demo of an accordion script
*[https://apps.shopify.com/product-description-accordion Shopify Accordion] Shopify product description accordion



((Graphical control elements))

((DEFAULTSORT:Accordion (Gui)))
[[Category:Graphical user interface elements]]
[[Category:Graphical control elements]]

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