Use this template to place a warning or any other message that you wish to draw special attention to. It is a more general version of the Prohibited template, for use when your message doesn't fit within the constraints of the existing language. You can actually use this template any time you might use the Prohibited template.
The template just provides the red box and diamond/excamation point graphic, it is up to you to supply the text, links, and any special formatting (bold, italics, etc).
Example
{{redbox|''This is something important you should know!''}}
This is something important you should know! |