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This template creates a dynamic navigation box using style sheet declarations in MediaWiki:Common.css and Javascript code in MediaWiki:Common.js. In a saved, rendered page this template creates a clickable link that toggles between [show] and [hide]. It displays the first parameter (the heading) with a [show] link on the right. If [show] is clicked by the user, it displays the second parameter (the body) below the heading and the [show] link becomes [hide]. Clicking on [hide] then hides the body and the [hide] link becomes [show] again.
If this template is nested in another, the show/hide links in the hidden content keep their state; there is no parameter for collapse all or reveal all.
Generally, collapsible templates should not be used in articles. For allowable uses and other considerations, please see MOS:COLLAPSE.