Returns "Sandbox"টেমপ্লেট:Aside if the template detects that the page where it is transcluded is a subpage named "sandbox" (i.e. a sandbox page); otherwise it returns nothingটেমপ্লেট:Spndashor, if supplied, the second unnamed parameter ("else return this" above). It corresponds to টেমপ্লেট:Plaincode.

This can be useful to e.g. switch the version of a template used in its /doc[umentation] to the version in its sandbox (by replacing টেমপ্লেট:Mono ... on the /doc page with টেমপ্লেট:Mono ...) when that documentation is transcluded on the template's sandbox page.