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Template:Preview warning emits a warning in preview. Modules should instead use the module interface _warning() in Module:If preview.
Usage
{{Preview warning|Warning text in preview}}
The warning will appear at the top of the page in preview, no matter where it is placed. It will be prefaced by "Preview warning:" in bold. The template will emit an always-visible warning if no warning text is supplied.
Parameters
|1=- The warning text you want to provide.
See also
{{If preview}}