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