`inherit event`
`method data : Js_of_ocaml__.Js.Unsafe.any Js_of_ocaml__.Js.opt Js_of_ocaml__.Js.readonly_prop`
`method origin : Js_of_ocaml__.Js.js_string Js_of_ocaml__.Js.t Js_of_ocaml__.Js.readonly_prop`
`method lastEventId : Js_of_ocaml__.Js.js_string Js_of_ocaml__.Js.t Js_of_ocaml__.Js.readonly_prop`
`method source : Js_of_ocaml__.Js.Unsafe.any Js_of_ocaml__.Js.opt Js_of_ocaml__.Js.readonly_prop`