(defcomp
  ()
  (div
    (~tw :tokens "space-y-3")
    (div
      (~tw :tokens "flex gap-2 items-end")
      (div
        (label (~tw :tokens "block text-xs text-stone-500 mb-1") "Category")
        (select
          :id "ref-inc-cat"
          :name "category"
          (~tw :tokens "px-3 py-2 border border-stone-300 rounded text-sm")
          (option :value "all" "All")
          (option :value "books" "Books")
          (option :value "tools" "Tools")))
      (button
        :sx-get "/sx/(geography.(hypermedia.(reference.(api.echo-vals))))"
        :sx-include "#ref-inc-cat"
        :sx-target "#ref-include-result"
        :sx-swap "innerHTML"
        (~tw :tokens "px-4 py-2 bg-violet-600 text-white rounded text-sm hover:bg-violet-700")
        "Filter"))
    (div
      :id "ref-include-result"
      (~tw :tokens "p-3 rounded bg-stone-100 text-stone-400 text-sm")
      "Click Filter — the select value is included in the request.")))