Looks like asking the question was enough for me to see it in a new light. 
My mistake was applying the extension to the output format rather than the 
input format. Thus, the following works:

pandoc -f html-native_divs-native_spans -t markdown

But this doesn't:

pandoc -f html -t markdown-native_divs-native_spans

I don't understand how to think about when to apply extension to the input 
versus the output format, but I do have a solution that enables me to move 
forward.

Cheers,

Brian



On Wednesday, February 22, 2023 at 10:53:22 PM UTC-8 Brian Granger wrote:

> Hi all,
>
> I am working on a usage case where I want to generate simplified, clean 
> Markdown without any explicit HTML tags or extended syntax such as the 
> fenced divs syntax (:::::). I only need to preserve the basic content of 
> the HMTL such as section headers, paragraphs, links, code blocks, etc. and 
> don't need (or want) any of extra content that would be put into HTML tags. 
> I have played with different Markdown format in Pandoc, filters, and 
> existing extensions, but haven't been able to achieve this yet. Does anyone 
> have any ideas or tips of things to try?
>
> Thank you!
>
> Cheers,
>
> Brian
>

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