 | This is a documentation subpage for Module:Category handler/data. It may contain usage information, categories and other content that is not part of the original module page. |
This module is used in conjunction with the category handler module to manage categories; it is a very important template used on millions of pages.
 | This Lua module is used in system messages, and on approximately 4,620,000 pages, or roughly 8% of all pages. Changes to it can cause immediate changes to the Wikipedia user interface. To avoid major disruption and server load, any changes should be tested in the module's /sandbox or /testcases subpages, or in your own module sandbox. The tested changes can be added to this page in a single edit. Please discuss changes on the talk page before implementing them. |
 | This module depends on the following other modules: |