`inherit Js_of_ocaml__.Dom_html.eventTarget`
`method onerror : ('self Js_of_ocaml__.Js.t, errorEvent Js_of_ocaml__.Js.t) Js_of_ocaml__.Dom_html.event_listener Js_of_ocaml__.Js.writeonly_prop`
`method onmessage : ('self Js_of_ocaml__.Js.t, 'b messageEvent Js_of_ocaml__.Js.t) Js_of_ocaml__.Dom_html.event_listener Js_of_ocaml__.Js.writeonly_prop`
`method postMessage : 'a -> unit Js_of_ocaml__.Js.meth`
`method terminate : unit Js_of_ocaml__.Js.meth`