This is atracking category.

It is used to build and maintain a list or 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 (Appearance → Show hidden categories) 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 subcategories into a larger, more efficient list (discriminated by classifications).
• Typically, tracking categories are automatically populated by templates invoked in pages or by the MediaWiki software (seeSpecial:TrackingCategories for an overview of the latter).

Administrators: Please do not delete this category as empty!

This category may be empty occasionally or even most of the time.

This tracking category lists pages withCS1 citations that use|url-status=usurped or|url-status=unfit.

The keywordsunfit andusurped are intended to identify original URLs that point to live sites that are inappropriate: spam, advertising, porn, etc.

A URL that returns aHTTP 404 error is not considered to be unfit and, in such cases, editors should set|url-status=dead.

CS1 and CS2 templates in pages listed in this category should be checked to ensure that theunfit andusurped keywords are correctly applied.

OnlyModule:Citation/CS1 should directly add pages to this category.

• |url-status=bot: unknown is tracked atCategory:CS1 maint: bot: original URL status unknown.
• |url-status=dead is not tracked.
• |url-status=live is not tracked.
• |url-status=deviated is not tracked.
• |url-status=<anything else> is tracked atCategory:CS1 errors: invalid parameter value.

• CS1 properties

• Hidden categories
• Tracking categories
• Template Large category TOC via Automatic category TOC on category with over 20,000 pages
• Automatic category TOC generates Large category TOC