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This template is for placement at the top of sandbox pages in the User namespace so that readers understand it is not an active/live article or Wikipedia project page.
Non-userspace uses of this template are tracked in Category:Non-userspace pages using User sandbox.
It is used by Template:User sandbox/preload, the default text preloaded (by MediaWiki:Gadget-mySandbox.js) when a user creates their sandbox.