Drup provided the easiest answer, that is using Tyxml_js. In particular it
provides a functional (reactive) API to update the DOM, which is a lot
better than using the [createElement] functions. Also, using
[Dom_svg.document] here is not appropriate since you want the SVG fragment
to be embedded in HTML. This function should be used when the whole
document is an SVG.

2016-01-02 21:42 GMT+01:00 <rixed@happyleptic.org>:

> Indeed TyXML can generate XHTML trees with svg elements.
> But how to use that to update the DOM from JS generated by js_of_ocaml?
>
> # echo > toto.ml <<EOF
> let svg = Dom_svg.createSvg Dom_html.window##document
> EOF
> # ocamlfind ocamlc -syntax camlp4o -package "js_of_ocaml
> js_of_ocaml.syntax" -c toto.ml
> Error: This expression has type Dom_html.document Js.t
>        but an expression was expected of type Dom_svg.document Js.t
>        Type
>          Dom_html.document = (... yanked for sanity ...)
>        is not compatible with type
>          Dom_svg.document = (... yum yum ...)
>        The second object type has no method anchors
>
> Apparently that's a known issue of js_of_ocaml:
> https://github.com/ocsigen/js_of_ocaml/issues/276
>
> that I don't know how to work around nicely, may be because I have no idea
> how
> js_of_ocaml interacts with tyxml. I guess you are the pveber of that
> discussion
> so probably you can shed some light on this?
>