This is a container category. Due to its scope, it should contain only subcategories.
This category contains only subcategories, which are added to this category using {{Unknown parameters category}}.
Infoboxes and WikiProject templates are categorised into their own subcategories:
- Category:Infoboxes with unknown parameters (856)
- Category:WikiProject templates with unknown parameters (553)
Articles are typically added to subcategories of this category when they use templates that incorporate Module:Check for unknown parameters.