{html, [
  {head, [
    {apply, {module, function, args}},
    {apply, {function, args},
    {apply, fun() -> {ok, <<>>} end},
    {apply, fun(Opts) -> {ok, <<>>} end},
    % send
    % {cast, {module, function, []}}
    {script, #{ src => "https://unpkg.com/htmx.org@1.9.9"}, []}
  ]},
  {body, [
  ]},
]}