Add a view source feature (i.e. using msgnw)
For example, the following:
{{#tag:pre|{{msgnw:Doc/Template}}}}
is rendered as
<includeonly>{{Doc
|Title=Template Documentation
|Target=TemplateDoc:{{PAGENAME}}
|Content=
__TOC__
{{#ifexist:TemplateDoc:{{PAGENAME}}|{{TemplateDoc:{{PAGENAME}}}}|This template has no associated documentation. Would you like to [[TemplateDoc:{{PAGENAME}}|create it?]]}}
}}</includeonly><noinclude>{{Doc/Template}} [[Category:Documentation templates]]</noinclude>
(I would like to make a template specifically for showing the source of a page, since the built-in abbreviation is very hard to remember).