Document unsupported knitr chunk options

Where should we set knitr chunk options in YAML? The original proposal from Max was:

format:
  html:
    fig-width: 6
    fig-height: 4.25
    fig-align: center

or

knitr:
  opts_chunk:
    fig-width: 6
    fig-height: 4.25
    fig-align: center

More comments from him:

Any recommendation? Are there certain options that should go in one place or another?

Also, I have the equivalent of _common.R. I’d like to specific device settings there using knitr::opts_chunk$set(blah blah blah)
Does that work too? I’d use this to alter options based on the target format (i.e. HTML versus LaTeX).

It looks like dev shouldn't be set in _quarto.yml (and is silently ignored). I set dev: svg for HTML format and it tried to use png.

My understanding is that some of them can be set under execute in the YAML: https://quarto.org/docs/reference/formats/html.html#execution.

And some under knitr: https://quarto.org/docs/reference/cells/cells-knitr.html

And I think instead of dev it's fig-format?
I'm also curious about the "right" answer to this.
And I'm fairly certain you can use knitr::opts_chunk$set(blah blah blah).

I (@allenmanning) answered:

you can use the R code version. also yes its fig-format. The format: html is for universally supported quarto options (i.e. stuff that works in jupyter and knitr). we've attempted to support as much as possible in both but knitr still has a lot of things that jupyter doesn't (thus the opts_chunk failsafe). So I'd say that the correct/recommended approach is to use the universal options (fig-format, execute: echo, etc.) and then only use the opts_chunk for things that are unsupported with the normal syntax

Is there a list of the unsupported options?

we don't currently