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