**Motivation**
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
**Mock**
The field should be located as shown in the mock, with the label called "Subpages of this page:"
F13906289
**Info i text**
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**subpageOf:**
{F13905558}
TEXT FOR COPYING:
**Subpages of this page :**
**Description:** Searches for pages that are subpages of this page.
**Be aware of the following: **
- You can only search for subpages of one page at a time.
- Don’t forget to enable the namespaces you want to limit your search to in the namespace filter.
- Do not include the namespace in front of the page name like this: `Wikipedia:Redirect`.
**Help page:** [[ https://www.mediawiki.org/wiki/Help:CirrusSearch#subpageof | subpageof ]]
**Syntax-Equivalent in the normal search:** `subpageof:` followed by a page name like `subpageof:Redirect`. Use double quotes if the parent page contains spaces: `subpageof:"Requests for comment"`.
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**Acceptance Criteria**
[] 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