Unexpected use of template ((13)) - see Template:13 for details.^[1]

This is the template sandbox page for Template:13 (diff).

Template documentation

Templates ((1)), ((2)), ((3)), etc. warn readers/editors that a typo exists in the page they are reading/editing. If ((13)) is called, you probably meant the parameter 13 (as (({13))} with triple braces), but in fact only double braces were used, invoking ((13)). In addition to a warning, it also adds pages to Category:Templates with incorrect parameter syntax. For more information on how template parameters work, see mw:Help:Templates#Parameters.

However, the most problems have been caused by omitting the first brace "{" of a parameter and getting ((13))}, as invoking Template:13 +"}" rather than parameter 13. This can be an insidious problem, especially when the transclusion of Template:13 is hidden, so that the effect is invisible to the person editing a page. For that reason, Template:13 now issues a warning to the user.

With that warning, the prior invisible access to Template:13 can now be understood to be a formerly unseen problem coded within a page.

Note: this will also pick up several variations such as ((13|)) for (({13|))} and (({13)).

Periodically, people check what-links-here to see if anyone has accidentally invoked Template:13.

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References

These references will appear in the article, but this list appears only on this page.

^ Show template documentation
Templates ((1)), ((2)), ((3)) etc warn readers/editors that a typo exists in the page they are reading/editing. If ((13)) is called, you probably meant the parameter 13 (as (({13))} with triple braces), but in fact only double braces were used, invoking ((13)). In addition to a warning, it also adds pages to Category:Templates with incorrect parameter syntax.
However, the most problems have been caused by omitting the first brace "{" of a parameter and getting ((13))}, as invoking Template:13 +"}" rather than parameter 13. This can be an insidious problem, especially when the transclusion of Template:13 is hidden, so that the effect is invisible to the person editing a page. For that reason, Template:13 now issues a warning to the user.
With that warning, the prior invisible access to Template:13 can now be understood to be a formerly unseen problem coded within a page.
Note: this will also pick up several variations such as ((13|)) for (({13

Editors can experiment in this template's sandbox (edit | diff) and testcases (create) pages.
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