it also works to use YAML comments, e.g.

% cat comment.md
---
# this is a comment
---

text

---
# this is another comment
---

% pandoc comment.md
<p>text</p>

On Wed, 22 Jun 2022 at 14:53, BPJ <melroch-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:

> I don't know if I or someone else has mentioned this before, but I just
> realized that there is (another) simple trick to simulate "markdown
> comments" as opposed to HTML comments:
>
> ``````markdown
> ```{=comment}
> This won't show up in HTML output!
> ```
>
> `This neither`{=comment}
>
> <!-- But this will be in HTML -->
> ``````
>
> Theoretically this might break if there ever is an output format called
> "comment" but I guess that is highly unlikely.
>
> It will also probably work with your local language's word(s) for
> 'comment'; I tried with Swedish "anmärkning" (and the abbreviations
> "anmärkn" and "anm") and it seems multi-byte chars in the "format name" is
> no problem.
>
> Also if you don't trust Pandoc to automatically reject raw elements with a
> bogus format you can use a simple filter:
>
> ``````lua
> local is_comment = {
>   'comment',
>   'com',
>   'remark',
>   'rem',
>   'kommentar',
>   'komm',
>   'anmärkning',
>   'anm',
>   'athugasemd',
>   'aths',
> }
> -- Turn the list into a set
> for i=1,#is_comment do
>   is_comment[is_comment[i]] = true
>   is_comment[i] = nil
> end
>
> local function raw (r)
>   if is_comment[r.format] then
>     return {}
>   else
>     return nil
>   end
> end
>
> return {
>   {
>     RawBlock = raw,
>     RawInline = raw,
>   }
> }
> ``````
>
> Notably this filter can be used to remove such "comments" from Markdown
> output, while otherwise they will remain when reformatting Markdown source
> with Pandoc, which IMO is an advantage over YAML comments.
>
> I hope this is useful for others,
>
> /bpj
>
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>

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