Dom_html._URL
method createObjectURL : Js_of_ocaml__.File.blob Js_of_ocaml__.Js.t -> Js_of_ocaml__.Js.js_string Js_of_ocaml__.Js.t Js_of_ocaml__.Js.meth
method revokeObjectURL : Js_of_ocaml__.Js.js_string Js_of_ocaml__.Js.t -> unit Js_of_ocaml__.Js.meth