Module:Category handler/data/doc

This is the documentation page for Module:Category handler/data

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This module's documentation is missing, inadequate, or does not accurately describe its functionality or the parameters in its code. Please help to expand and improve it.

This Lua module is used in system messages, and on approximately 4,700,000 pages, or roughly 50059% 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.