Template:Subpage other/doc

This is a documentation subpage for Template:Subpage other.
It contains usage information,

categories and other content or metadata that is not part of the original template.

Usage

This template checks whether the current page is a subpage or not. A subpage is a page that has a slash:

[[Template:Parentpage/Subpage]]

Exception: in article space (mainspace) the slash is part of the title, and there are no subpages. Example, AC/DC is a parent page not a subpage.

Usage example: both Template:Infobox element isotopes and Template:Infobox element isotopes/infotable use documentation page Template:Infobox element isotopes/doc. We only want to categorise the parent page. So in the /doc page we add:

{{Subpage other||[[Category:Chemical element infobox]]}}

Note: WP:Subpage uses an other definition than magic word {{SUBPAGENAME}}. This template uses the former definition (pagename has an after-slash part).