`method target : Js_of_ocaml__.Dom.node Js_of_ocaml__.Js.t Js_of_ocaml__.Js.readonly_prop`
`method contentRect : Js_of_ocaml__.Dom_html.clientRect Js_of_ocaml__.Js.t Js_of_ocaml__.Js.readonly_prop`
`method borderBoxSize : resizeObserverSize Js_of_ocaml__.Js.t Js_of_ocaml__.Js.js_array Js_of_ocaml__.Js.t Js_of_ocaml__.Js.readonly_prop`
`method contentBoxSize : resizeObserverSize Js_of_ocaml__.Js.t Js_of_ocaml__.Js.js_array Js_of_ocaml__.Js.t Js_of_ocaml__.Js.readonly_prop`