`method numberOfItems : int Js_of_ocaml__.Js.readonly_prop`
`method clear : unit Js_of_ocaml__.Js.meth`
`method initialize : 'a -> 'a Js_of_ocaml__.Js.meth`
`method getItem : int -> 'a Js_of_ocaml__.Js.meth`
`method insertItemBefore : 'a -> int -> 'a Js_of_ocaml__.Js.meth`
`method replaceItem : 'a -> int -> 'a Js_of_ocaml__.Js.meth`
`method removeItem : int -> 'a Js_of_ocaml__.Js.meth`
`method appendItem : 'a -> 'a Js_of_ocaml__.Js.meth`