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This how-to guide describes how to use the classes attributes in ambox to create article message boxes such as {{cleanup}}. The ambox CSS classes are defined in MediaWiki:Common.css. This guide describes how to use the classes directly in wikitables and HTML tables.
There is also a meta template {{ambox}} that makes it easy to create article message boxes. It has usage documentation and examples and can handle the most common usage cases. But {{ambox}} is mostly a thin wrapper for the classes. If/when you need more advanced functionality you can use the classes directly in a wikitable or HTML table as described in this guide.