Template:T optional parameter demo/doc
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This is an example template for demonstrating the monitoring of parameter usage using Template:Voidd.
Special:Whatlinkshere/Template:T_optional_parameter_demo shows the pages that transclude this template. Part of them use parameter 1 (listed in Special:Whatlinkshere/Template:T_optional_parameter_demo/1/defined, and part of them do not (listed in Special:Whatlinkshere/Template:T_optional_parameter_demo/1/undefined).
In addition, e.g. Special:Whatlinkshere/Template:T_optional_parameter_demo/1/3 shows the pages that call the template with the first parameter equal to 3, and Special:Whatlinkshere/Template:T_optional_parameter_demo/1/7 shows the pages that call the template with the first parameter equal to 7, if any.