{{ $taxonomy := "categories" }} {{ with .Param $taxonomy }}
  {{ $len := (len .) }}
  {{ range $index, $tag := . }}
  {{ $urlTag := $tag | urlize }}
  {{ with $.Site.GetPage (printf "/%s/%s" $taxonomy $urlTag) -}}
  <a href="{{ .Permalink }}">{{ $tag }}</a>{{ cond (eq (add $index 1) $len) "" ", " }}
  {{- end -}}{{- end -}}
{{ end }}