Notification.notificationOptionsInitializer for notification. All fields are optional; create an empty record with empty_options and populate the ones you need.
Text direction: "auto" (default), "ltr" or "rtl".
method actions : notificationAction Js_of_ocaml__.Js.t
Js_of_ocaml__.Js.js_array
Js_of_ocaml__.Js.t
Js_of_ocaml__.Js.writeonly_prop