`method length : int Js_of_ocaml__.Js.readonly_prop`
`method item : int -> Js_of_ocaml__.Js.js_string Js_of_ocaml__.Js.t Js_of_ocaml__.Js.optdef Js_of_ocaml__.Js.meth`
`method contains : Js_of_ocaml__.Js.js_string Js_of_ocaml__.Js.t -> bool Js_of_ocaml__.Js.t Js_of_ocaml__.Js.meth`
`method add : Js_of_ocaml__.Js.js_string Js_of_ocaml__.Js.t -> unit Js_of_ocaml__.Js.meth`
`method remove : Js_of_ocaml__.Js.js_string Js_of_ocaml__.Js.t -> unit Js_of_ocaml__.Js.meth`
`method toggle : Js_of_ocaml__.Js.js_string Js_of_ocaml__.Js.t -> bool Js_of_ocaml__.Js.t Js_of_ocaml__.Js.meth`
`method stringifier : Js_of_ocaml__.Js.js_string Js_of_ocaml__.Js.t Js_of_ocaml__.Js.prop`