Developer experience: Not always clear how to init from JS

[cmditch]

I appreciate how much effort and focus the Elm community devotes to clear & thorough documentation. In an effort to continue improving the docs, I'll go over an experience I recently had trying to use Browser.sandbox for a SSCCE.

I found that it was not very clear from the Browser.element or Browser.sandbox docs how to initialize them within JS.

I spent quite a bit of time pouring over the package docs, elm guide, and elm guide examples to no avail.

I eventually happened upon https://guide.elm-lang.org/interop/ , which shows the use of the node field, but it's not clear when this field is relevant wrt sandbox, element, document, application. I also found https://guide.elm-lang.org/webapps/, but this only shows how to init a document.

Potential ways to ameliorate this confusion:

1. Include js snipptes in the Browser docs.
2. Include js/html snippets in the guides examples instead of only pure Elm.
3. Include something like the table below as a quick and clear reference in the Browser docs and Elm guide (with help from @Janiczek).

   +----------------------+-------------------+------------------------+
   | entry point js param | uses `node` field | supports `flags` field |
   +----------------------+-------------------+------------------------+
   | Platform.worker      | no                | yes                    |
   +----------------------+-------------------+------------------------+
   | Browser.sandbox      | yes               | no                     |
   +----------------------+-------------------+------------------------+
   | Browser.element      | yes               | yes                    |
   +----------------------+-------------------+------------------------+
   | Browser.document     | no                | yes                    |
   +----------------------+-------------------+------------------------+
   | Browser.application  | no                | yes                    |
   +----------------------+-------------------+------------------------+

4. All of the above
5. None of the above and something better?

Thanks! Coury