`method detail : 'detail Js_of_ocaml__.Js.writeonly_prop`
`method start : Js_of_ocaml__.Js.js_string Js_of_ocaml__.Js.t Js_of_ocaml__.Js.writeonly_prop`

Start as a mark name. Maps to the JavaScript `start` field.

`method start_time : Js_of_ocaml__.Js.number_t Js_of_ocaml__.Js.writeonly_prop`

Start as a timestamp. Maps to the JavaScript `start` field.

`method _end : Js_of_ocaml__.Js.js_string Js_of_ocaml__.Js.t Js_of_ocaml__.Js.writeonly_prop`

End as a mark name. Maps to the JavaScript `end` field.

`method end_time : Js_of_ocaml__.Js.number_t Js_of_ocaml__.Js.writeonly_prop`

End as a timestamp. Maps to the JavaScript `end` field.

`method duration : Js_of_ocaml__.Js.number_t Js_of_ocaml__.Js.writeonly_prop`