This is a feature request.
Templates sometimes include an example of their own usage inside <noinclude>
tags. It would be nice if previewing a change to such a template would reflect
the changes. In fact, as far as I know, there is currently no way to preview
the effect of a template aside from (1) submitting it, (2) picking a page that
includes it, (3) doing a null edit on said page, and (4) inspecting said page.
This suggestion would provide a way to preview template changes before they go