It takes no parameters and produces a horizontal ruler in the same colour as the red border for the {{fmbox}} warning type and the ".fmbox-warning" CSS class in MediaWiki:Common.css.

It is used to separate parts of some interface messages, such as MediaWiki:Cascadeprotectedwarning. See what links here for the rest of the interface messages that use it.

Note: MediaWiki doesn't parse and convert HTML wikimarkup in interface messages. Thus this template must be fully XHTML compliant. This means that any HTML tag in it must have a proper ending. For instance <hr> is wrong, but <hr /> is right.

• {{fmbox}} – Can be used to build pink system warning notices.
• Template talk:Fmbox#New type, section break 1 – The discussion that resulted in this style.

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