yes
 | This template is used in system messages, and on approximately 2,620,000 pages, or roughly 4% 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 template's /sandboxor/testcases subpages, or in your own user subpage. The tested changes can be added to this page in a single edit. Please discuss changes on the talk page before implementing them. |
 | This template uses Lua:
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Detects whether the current or the given namespace has subpages enabled. Returns "yes" if it does, and an empty string otherwise.
This template can be substituted.
{{ns has subpages}} → yes{{ns has subpages|Template}} → yes{{ns has subpages|Category}} → yes{{ns has subpages|}} (main space) →{{ns has subpages|{{ns:0}}}} (main space) →{{ns has subpages|:}} (main space) →{{ns has subpages|{{ns:Talk}}}} → yes{{ns has subpages|Category talk}} → yes{{ns has subpages|File:Foo}} →{{ns has subpages|Foo}} →{{ns has subpages|:Template}} → yes{{namespace detect}}