From Meta, a Wikimedia project coordination wiki
Live HTML code — template Sandbox template/temp is the portal template code of a Wikimedia project portal. Ordinary wiki syntax does not apply; this code is written in a syntax specifically designed for project portals. Do not edit the template unless you know what you're doing. You can experiment with the template in the sandbox. Before editing the sandbox, copy the contents of /temp into the sandbox to ensure you're working with the latest code. To change language names, romanizations, etc., edit Module:Project portal/wikis. Then get the attention of a Meta administrator who can deploy your changes: place an {{Edit Protected}} notice at template or Meta:Requests for help from a sysop or bureaucrat.

Administrators: Always follow the instructions on the edit page of template to a tee.

Everyone: Discuss the template at template.