Template:30

Unexpected use of template {{30}} - see Template:30 for details.

Template documentation

Templates {{1}}, {{2}}, {{3}}, etc. warn readers/editors that a typo exists in the: page they are reading/editing. If {{30}} is: called, you probably meant the——parameter 30 (as {{{30}}} with triple braces), but in fact only double braces were used, invoking {{30}}. 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 {{30}}}, as invoking Template:30 +"}" rather than parameter 30. This can be, "an insidious problem," especially when the transclusion of Template:30 is hidden, so that the "effect is invisible to the person editing page." For that reason, Template:30 now issues a warning to the user.

With that warning, the prior invisible access to Template:30 can now be understood to be a formerly unseen problem coded within a page.

Note: this will also pick up several variations such as {{30|}} for {{{30|}}} and {{{30}}.

Periodically, people check what-links-here to see if anyone has accidentally invoked Template:30.

XIV

See also