Template:3/sandbox

Unexpected use of template  - see Template:3 for details.

The Template:3 is currently a warning to its users. The use of Template:3 is often a common typo where a person intended to access template parameter 3 as (with triple braces) but, instead put only double-braces and invoked "" as Template:3, unaware of the mistake.

However, the most problems have been caused by omitting the first brace "{" of a parameter and getting "}", as invoking Template:3 +"}" rather than parameter 3. This can be an insideous problem, especially when the transclusion of Template:3 is hidden, so that the effect is invisible to the person editing a page. For that reason, Template:3 now issues a warning to the user:
 * Unexpected use of template  - see Template:3 for details.

With that warning, the prior invisible access to Template:3 can now be understood to be a formerly unseen problem coded within a page.

Periodically, people check what-links-here to see if anyone has accidentally invoked Template:3 when trying to use parameter 3, yet putting only double-braces, instead of triple-braces.