Category:Hidden templates using styles

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 the encyclopedia's categorization scheme.
Populated by {{hidden}}, when it's called using the deprecated parameters |bg1=, |bg2=, |ta1=, |ta2=, |fw1=, |fw2=, when these should be replaced by appropriate uses of |style= and |headerstyle=.

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This category is hidden on its member pages—unless the corresponding user preference (Appearance → Show hidden categories) is set.
These categories are used to track, build and organize lists of pages needing "attention en 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 (see Special:TrackingCategories for an overview of the latter).

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

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