Seems like a bug to me. Can you open an issue at our GitHub tracker?
https://github.com/jgm/pandoc/issues

> On Oct 17, 2022, at 8:04 AM, BPJ <melroch-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> When converting to mediawiki MW headings are prepended with a span
> `<span id="HEADING-ID"></span>`, evidently to provide an anchor to
> pandoc's original/automatic id so that internal links will still work. However
> if there is a `<section>` element[^1] I frequently end up with an identical id
> tag on the div resulting from the section element and the automatically
> inserted span element, which seems like a bug to me:
>
> ``````html
> <section id="head-2" class="level2">
> <h2>Head 2</h2>
> <section id="head-3" class="level3">
> <h3>Head 3</h3>
> <ol type="1">
> <li><p>Li 1</p></li>
> <li><p>Li 2</p>
> <p>Li 2 para 2</p></li>
> <li><p>Li 3</p></li>
> </ol>
> <p>Text</p>
> <ol type="i">
> <li>Li i</li>
> <li>Li ii</li>
> </ol>
> </section>
> </section>
> ``````
>
> ``````mediawiki
> <div id="head-2" class="section level2">
>
> <span id="head-2"></span>
> == Head 2 ==
>
> <div id="head-3" class="section level3">
>
> <span id="head-3"></span>
> === Head 3 ===
>
> <ol style="list-style-type: decimal;">
> <li><p>Li 1</p></li>
> <li><p>Li 2</p>
> <p>Li 2 para 2</p></li>
> <li><p>Li 3</p></li></ol>
>
> Text
>
> <ol style="list-style-type: lower-roman;">
> <li>Li i</li>
> <li>Li ii</li></ol>
>
>
> </div>
>
> </div>
> ``````
>
> It seems that the only fix currently is to go through the MW source after
> conversion and manually remove any offending spans.
>
> I wish the mediawiki writer were smart enough to not insert the span above the
> heading if its id would be identical to that of a parent section div. Would that
> be possible, and is this enough of a bug to submit an issue?
>
> In the actual use case I modify the HTML input with an HTML editing
> script/library before conversion to mediawiki, and as a part of that I add
> attributes to the section elements which I want to be there on the div in
> the MW output, so removin
>
> [^1]: In my case inserted by pandoc into the HTML now used as source at an
> earlier run.
>
>
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