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Template documentation

Can be used to add style to templates. For example, a template definition could look like this:

<includeonly>{{template style |
  (CSS rules go here)
}}
(actual template content here)
</includeonly><noinclude>
(template documentation)
</noinclude>

This basically just wraps a use of Extension:CSS (i.e. {{#css: ... }}) in some extra code that makes sure the style is only added once per page, and not repeated for every single use of the template.

The actual functionality is implemented via Module:Template style.