**Motivation**
Searching for categories is one of the main use cases for advanced search, and most people expect such a search to also find contents of subcategories of the searched category.
**Task**
Add the new deep category search keyword to the advanced param form, once it is implemented.
**Mock**
For position and label see
{F14613575}
**Info i text**
{F14627970}
TEXT FOR COPYING:
**Pages in this language:**
**Description:** Searches for pages that are in these categories and subcategories.
**Be aware of the following: **
- Only the first 5 subcategories will be considered in your search.
- The number of categories is limited to 256.
- You can look for pages in multiple categories.
**Help page:** [[ https://www.mediawiki.org/wiki/Help:CirrusSearch#Deepcategory | deepcategory ]]
**Syntax-Equivalent in the normal search:** `deepcategory:` followed by a category name like `deepcategory:Help`. Use double quotes if the name contains spaces: `deepcategory:"Hidden categories"`.
**Acceptance Criteria**
[] The label and field are in the position as indicated in the mock
[] TODO How many category inputs are allowed
[] TODO Error message
**Note** We can reuse the category multiselect widget from the Upload wizard