Sandbox
{{#input:type=select|name=cat|{{#dpl:
|namespace=Category |format=,\n*%TITLE%,, }}
}} {{#dpl:category={{#request:cat}}}}
{{#input:type=select|name=cat|{{#dpl:
|namespace=Category |format=,\n*%TITLE%,, }}
}} {{#dpl:category={{#request:cat}}}}