Template:URL

{{#invoke:Check for unknown parameters|check|unknown={{#switch:

 {{#if: 
 | {{{demospace}}}    
 | {{#ifeq:Template|
   | main
   | other
   }} 
 }}

| main = | other | #default = }}|preview=Page using Template:URL with unknown parameter "_VALUE_"|ignoreblank=y | 1 | 2 }}{{#invoke:documentation|main|_content={{ {{#invoke:documentation|contentTitle}}}}}}