This is atracking category. It is used to build and maintain lists of pages—primarily for the sake of the lists themselves and their use in article and category maintenance. It is not part of theencyclopedia's categorization scheme. More information: This category ishidden on itsmember pages—unless the correspondinguser preference is set. These categories are used to track, build and organize lists of pages needing "attentionen masse" (for example, pages using deprecated syntax), or that may need to be edited at someone's earliest convenience. These categories also serve to aggregate members of several lists or sub-categories into a larger, more efficient list (discriminated by classifications).

This is a tracking category forCS1 citations that have unsupported|periodical= (or alias) errors.

Pages with this error are automatically placed in Category:CS1 errors: periodical ignored.

• Pages transcluding nonexistent sections
• Hidden categories
• Tracking categories
• CatAutoTOC generates standard Category TOC
• CS1 errors