Plotly_jsoo.JstoolsSourceval getById_coerce :
(Js_of_ocaml.Dom_html.element Js_of_ocaml.Js.t -> 'a Js_of_ocaml.Js.opt) ->
string ->
'a optionval getById_coerce_exn :
(Js_of_ocaml.Dom_html.element Js_of_ocaml.Js.t -> 'a Js_of_ocaml.Js.opt) ->
string ->
'a