Template:Used in system/sandbox

This template is used in system messages.
Changes to it can cause immediate changes to the Wikipedia user interface. To avoid large-scale disruption, any changes should first be tested in this template's /sandbox or /testcases subpage, or in your own user space. The tested changes can then be added in one single edit to this template. Please discuss any changes on the talk page before implementing them.

This is the template sandbox page for Template:Used in system (diff).
See also the companion subpage for test cases.