The `subpageof` [[ https://www.mediawiki.org/wiki/Help:CirrusSearch/en#subpageof | keyword ]] allows you to find subpages of a specified page, e.g. archived user pages.
We want to support this functionality through the advancedSearch form
The field should be located as shown in the mock, with the label called "Subpages of this page"
**Info i text**
 The field and label are located as described
 The whole field is for one page name, no pills are created
 There are quotation marks around the field if necessary, so if I enter "Lea Voget (WMDE)" into the field, something is shown
 When entering a page name into that field, subpages are shown in the result list
 The info i is layouted equally to all existing info texts on advancedSearch, and the contents is what is described above