Testpage/subpage

This is the name of this page: FULLPAGENAME=Testpage/subpage

This is a link to the name of this page PAGENAME=Testpage/subpage

This is a link to the basename BASEPAGENAME=Testpage

This is the subpage: SUBPAGENAME=subpage

SUBJECTPAGENAME=Testpage/subpage

ARTICLEPAGENAME=Testpage/subpage

TALKPAGENAME=Talk:Testpage/subpage

ROOTPAGENAME=Testpage

See https://www.mediawiki.org/wiki/Special:MyLanguage/Help:Magic_words