This template "clears" both margins; it is often used before a header to make sure that the header will be the full width of the page. For technical XHTML details see Template talk:-.

Usage

To clear both margins, type {{-}} on a new line. To clear the left margin only, leaving the right margin uncleared, type {{-|left}}. You may wish to only clear the left margin if there is an infobox to the right of the article and you do not wish to leave a large gap of white space to the left. To clear the right margin only, type {{-|right}}.

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