If you mean a third version which is used when targeting any other format
then you would need a div and filter it out when targeting LaTeX or HTML.
That subject was up here only last week. Look for "conditional compilation".

Den ons 10 apr. 2019 03:12jeremy theler <jeremy-24em0bpozeFWk0Htik3J/w@public.gmane.org> skrev:

> is there a generic fallback like an "else" statement for neither html nor
> latex outputs?
>
> On Tue, Apr 9, 2019, 16:30 John MacFarlane <jgm-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org> wrote:
>
>> ivo welch <ivowel-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
>>
>> > my main problem is the lack of column spanning support in md tables.
>> >  Alas, until there is a definitive solution, are there crutch
>> solutions?
>> > In particular, I wonder how one can author raw html tables (and/or raw
>> tex)
>> > tables into the markdown text and just do it twice, once in each native
>> > format.
>>
>> Yes, you can do this. Use the raw attribute:
>>
>> ```{=latex}
>> \begin{table}
>> ...here's your tex table.
>> ...it won't appear in HTML output
>> \end{table}
>> ```
>>
>> ```{=html}
>> <table>
>> ...here's your HTML table.
>> ...it won't appear in LaTeX output
>> ```
>>
>> > or can pandoc take an html table with column spans, properly
>> > designated in the markdown, and convert it to a tex table with column
>> spans
>> > (i.e., not authoring the table as a markdown table).
>>
>> Sorry, the answer to this is no, currently.
>>
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