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A collapsible element contains a toggle a reader can use to show or hide the element's content. Elements are made collapsible by adding the mw-collapsible class, or alternatively by using the {{Collapse}} template, or its variants {{Collapse top}} and {{Collapse bottom}}.
Use of these features in article content is governed by the guidelines Wikipedia:Manual of Style § Scrolling lists and collapsible content generally, and more specifically by Wikipedia:Spoiler.