— and ℋ will be parsed as unicode characters and these will be passed through to the HTML.
You can check the intermediate HTML file (again it will be printed with --verbose) to confirm this.
It may be that the program that is being invoked to go from HTML -> PDF (wkhtmltopdf ?) doesn't handle these characters properly.
You could try adding the `--ascii` option which will force entities to be used.

> On Jul 4, 2023, at 4:07 PM, Luveh Keraph <1.41421-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> Thanks. I invoked pandoc -f gfm MyDoc. -o MyDoc.pdf and in the resulting PDF document the subscripts are still ignored. When running it with --verbose in the resulting output I saw numerous instances of
>
> [INFO] Not rendering RawInline (Format "html") "</sub>"
> [INFO] Not rendering RawInline (Format "html") "<sub>"
>
> However, when I added -t html5 to the invocation the diagnostics above disappear, and the subscripts are indeed present in the converted PDF file. Thanks for the tip - it has indeed improved things. Now it is still the case that things like &mdash; or &Hscr; are ignored by pandoc. Any suggestions on how to get pandoc to process them?
>
> I am using the following:
>
> pandoc 3.1.4
> Features: +server +lua
> Scripting engine: Lua 5.4
>
>
>
>
>
>
> On Tue, Jul 4, 2023 at 3:50 PM John MacFarlane <fiddlosopher-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> HTML tags should be passed through to HTML formats.
>
> Have you looked at the intermediate HTML produced?  You can use --verbose to see it.
>
> This seems to work fine:
>
> % pandoc -t html5
> _A__{_m_}
> <p><em>A</em>_<em>m</em></p>
>
> PS. You probably want to use -f gfm if you're targeting GitHub Markdown.
>
> Pandoc version?
>
>
>
> > On Jul 3,
>
> > 2023, at 3:41 PM, Luveh Keraph <1.41421-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> >
> > I have a Github Markdown document that contains HTML tags - mostly to do with special characters (e.g. &Hscr;) and stuff to place pictures where I want in the page. The thing is, pandoc seems to ignore the HTML tags. Is this a limitation intrinsic to pandoc, or is there any way to get pandoc to process such tags and produce the right output?
> >
> > The pandoc invocation that I am currently using for converting my Github Markdown documents to PDF is
> >
> >  $ pandoc --resource-path=/home/abc/Repos.wiki -t html5 --pdf-engine=wkhtmltopdf --metadata pagetitle="MyDoc.md" --css github.css -o MyDoc.pdf
> >
> > The default invocation pandoc MyDoc.md -o MyDoc.pdf is not dealing with images properly (in that it sometimes rearranges surrounding paragraphs the wrong way) and it seems to be unable to deal with expressions like _A__{_m_}, in that the _and directives seem to be ignored.
> >
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