Have you considered the --sections-divs option (
https://pandoc.org/MANUAL.html#option--section-divs)?

For example, this markdown:

# A

## A1

## A2

# B

gives the following:

(1) pandoc section-divs.md

<h1 id="a">A</h1>
<h2 id="a1">A1</h2>
<h2 id="a2">A2</h2>
<h1 id="b">B</h1>

(2) pandoc section-divs.md --section-divs

<section id="a" class="level1">
<h1>A</h1>
<section id="a1" class="level2">
<h2>A1</h2>
</section>
<section id="a2" class="level2">
<h2>A2</h2>
</section>
</section>
<section id="b" class="level1">
<h1>B</h1>
</section>

(3) pandoc section-divs.md --section-divs --to=html4

<div id="a" class="section level1">
<h1>A</h1>
<div id="a1" class="section level2">
<h2>A1</h2>
</div>
<div id="a2" class="section level2">
<h2>A2</h2>
</div>
</div>
<div id="b" class="section level1">
<h1>B</h1>
</div>

On Thu, 25 May 2023 at 20:36, H <agents-FcZObrvlYduBUy7/sJONFg@public.gmane.org> wrote:

> On May 25, 2023 6:42:49 AM EDT, Felix SOEDJEDE <soefelix-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> >You could use Fenced divs:
> >https://pandoc.org/MANUAL.html#divs-and-spans
> >
> >You can put inside headers, paragraphs, code blocks, etc.
> >
> >
> >Le jeudi 25 mai 2023 à 01:20:09 UTC+2, H a écrit :
> >
> >> On 05/24/2023 04:51 PM, H wrote:
> >> > Using pandoc 3.1.2 and am trying my hand at writing my first writer
> >to
> >> customize HTML output for a specific, predefined newsletter format.
> >> >
> >> > The source document is written in markdown, contains headers of
> >various
> >> levels, paragraphs of text, links to images and mail links. No lists,
> >no
> >> tables and no code blocks.
> >> >
> >> > The document is structured with an introductory section, multiple
> >> identically formatted sections and then a final section at the end. I
> >need
> >> to wrap various portions of the structure with <div></div> at
> >multiple
> >> levels in order to achieve the desired formatting. Some of the
> ><div></div>
> >> tags need to wrap H1, H2, image, multiple paragraphs, other
> ><div></div>
> >> tags wrap only one such item. In addition, most HTML tag need to have
> >some
> >> predefined custom style information.
> >> >
> >> > This output will be manually added to a certain newsletter editor
> >in a
> >> CRM system and I cannot add any CSS information whatsoever,
> >everything has
> >> to be structured as outlined above.
> >> >
> >> > Since I am new to writing filters, I am looking for some
> >suggestions how
> >> approach the <div></div> wrapping when multiple different HTML items
> >need
> >> to be wrapped.
> >> >
> >> > Thank you.
> >> >
> >> I should add that one <div></div> pair may enclose H1, H2, image, and
> >
> >> several paragraphs until the next H1 tag or end of document. Another
> >> <div></div> pair (within the just-mentioned pair) may enclose the
> >image and
> >> several paragraphs, again until the next H1 tag (or end of document).
> >There
> >> are some additional levels of <div> pairs but this describes the gist
> >of it.
> >>
> >> Suggestions welcome!
> >>
> >>
>
> I do not want to make any changes to the source markdown document, the
> appropriate processing needs to be done in my custom output HTML filter.
>
> I am looking into the following (simplified) flow example:
> - Add a <div> tag when encountering a H2 element.
> - Add the corresponding </div> tag when encountering a H1 or H2 element or
> the end of the document.
>
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