For others who might find it helpful this was resolved in pandoc-crossref 
issue 319 <https://github.com/lierdakil/pandoc-crossref/issues/319>.

On Friday, 23 July 2021 at 18:36:13 UTC-7 Leena Murgai wrote:

> Currently
> \ref{eq:label}
> in LaTeX gives
> <a href="#eq:label" data-reference-type="ref" data-reference="eq:label">[
> eq:label]</a>
> in HTML.
>
> On Friday, 23 July 2021 at 16:22:24 UTC-7 Leena Murgai wrote:
>
>> Oh and
>> \ref{eq:label}
>> in LaTeX should give
>> <a href ="#eq:label"data-reference-type="ref" data-reference="eq:label">
>> chap#.value(eq:label)</a>
>> in HTML.
>> On Friday, 23 July 2021 at 16:06:31 UTC-7 Leena Murgai wrote:
>>
>>> Thanks for the reply John.
>>>
>>> I've been playing around with an equation in LaTeX and seeing what comes 
>>> out in HTML5 and also looking at what pandoc-crossref expects to find in 
>>> the markdown. 
>>>
>>> LaTeX equation format:
>>>   \begin{equation} \label{eq:label}
>>>   equation
>>>   \end{equation}
>>> Note: \label{eq:label} must be inside the equation environment, above 
>>> is how I do it, but equally one can place the label after equation.
>>>
>>> I tried moving label around in my LaTeX to see if it made a difference 
>>> to the output HTML since pandoc-crossref expects to find the label 
>>> after the equation environment 
>>> <http://lierdakil.github.io/pandoc-crossref/#equation-labels>. Here's 
>>> the HTML output in each case:
>>>
>>> 1. \label{eq:label} after \begin{equation}:
>>>
>>>   <span class="math display">\label{eq:label}equation</span>
>>>
>>> 2. \label{eq:label} after equation:
>>>
>>>   <span class="math display">equation\label{eq:label}</span>
>>>
>>> 3. \label{eq:label} after \end{equation}: Note that this will break the 
>>> LaTeX code
>>>
>>>   <span class="math display">equation</span><span>[eq:label]</span>
>>>
>>> So, none of the above seem to give pandoc-crossref what it needs. 
>>> Honestly, I'm not massively familiar with HTML and css - just figuring it 
>>> out as I go. I imagine whatever pandoc-crossref would output (if I could 
>>> get it to work) would be great. My quick and dirty approach (to get 
>>> something like what LaTeX gives) would be to put the equation and its label 
>>> in a table row. Something like
>>>
>>> <div>
>>> <table width=100% style="border: none;">
>>> <tr>
>>> <td style="text-align: center; border: none;"><span id="eq:label" 
>>> class="math display">equation</span></td>
>>> <td style="text-align: right; border: none; width: 5%;">(chap#.value{
>>> eq:label})</td>
>>> </tr>
>>> </table>
>>> </div>
>>>
>>> I'm open to suggestions if hard coding 5% for the label width seems like 
>>> a bad idea or some such.
>>>
>>> Thanks,
>>> Leena
>>>
>>>
>>>
>>> On Wednesday, 21 July 2021 at 22:24:47 UTC-7 John MacFarlane wrote:
>>>
>>>>
>>>> As I said: 
>>>>
>>>> Just let us know what you want to appear in the HTML, and we can 
>>>> show you how to do it. 
>>>>
>>>>
>>>>
>>>> Leena Murgai <leena...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes: 
>>>>
>>>> > Hi John, 
>>>> > 
>>>> > Can you clarify your work around here? I wasn't able to follow. 
>>>> > 
>>>> > I have a similar problem converting from LaTeX to HTML5 - \label and 
>>>> \ref 
>>>> > for equations don't work. I'd be super grateful for any advice you 
>>>> could 
>>>> > offer. 
>>>> > 
>>>> > Thanks! 
>>>> > Leena 
>>>> > 
>>>> > On Tuesday, 29 June 2021 at 11:23:40 UTC-7 John MacFarlane wrote: 
>>>> > 
>>>> >> 
>>>> >> This isn't yet supported, really. But you might be able to 
>>>> >> work around it. 
>>>> >> 
>>>> >> Note: 
>>>> >> 
>>>> >> % pandoc -f latex -t native 
>>>> >> \ref{foo} 
>>>> >> ^D 
>>>> >> [Para [Link ("",[],[("reference-type","ref"),("reference","foo")]) 
>>>> [Str 
>>>> >> "[foo]"] ("#foo","")]] 
>>>> >> 
>>>> >> So when pandoc parses \ref{foo}, it doesn't just create a string 
>>>> >> [foo]; it creates a link with attributes. You could use a lua 
>>>> >> filter to turn this into something that mathjax can consume 
>>>> >> (raw tex, I would imagine). 
>>>> >> 
>>>> >> Just let us know what you want to appear in the HTML, and we can 
>>>> >> show you how to do it. 
>>>> >> 
>>>> >> Ian Price <ianpr...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes: 
>>>> >> 
>>>> >> > Hello, 
>>>> >> > My university is looking into the options for converting various 
>>>> notes, 
>>>> >> > exercises sheets, presentations, etc. from latex generated pdf 
>>>> into a 
>>>> >> more 
>>>> >> > accessible format. This basically means converting to html + 
>>>> mathjax 
>>>> >> > because this tends to work better for screen readers. Converting 
>>>> beamer 
>>>> >> > seems to be impossible, but for notes pandoc (and some others like 
>>>> >> latexml) 
>>>> >> > is generally giving good output, however the major issue is cross 
>>>> >> > referencing between text and maths blocks. 
>>>> >> > 
>>>> >> > In short, mathjax can handle internal links from maths blocks to 
>>>> other 
>>>> >> > maths blocks, and pandoc can handle links to other parts of pandoc 
>>>> >> > documents, except when a document makes specific reference to an 
>>>> >> equation. 
>>>> >> > For example, suppose we have the following mwe.tex cut out from 
>>>> some 
>>>> >> > electromagnetism notes 
>>>> >> > --- 
>>>> >> > \documentclass[12pt]{article} 
>>>> >> > \begin{document} 
>>>> >> > \begin{equation} 
>>>> >> > J \equiv \frac{dI}{da_{\perp}} = \rho v. 
>>>> >> > \label{volume-current-density} 
>>>> >> > \end{equation} 
>>>> >> > The total current crossing a surface $S$ can be calculated by 
>>>> >> integrating 
>>>> >> > Eq. (\ref{volume-current-density}): 
>>>> >> > \end{document} 
>>>> >> > --- 
>>>> >> > When converted to markdown, we get the following 
>>>> >> > --- 
>>>> >> > $$J \equiv \frac{dI}{da_{\perp}} = \rho v. 
>>>> >> > \label{volume-current-density}$$ 
>>>> >> > 
>>>> >> > The total current crossing a surface $S$ can be calculated by 
>>>> >> > integrating Eq. 
>>>> >> > 
>>>> >> 
>>>> ([\[volume-current-density\]](#volume-current-density){reference-type="ref" 
>>>> >> > reference="volume-current-density"}): 
>>>> >> > --- 
>>>> >> > The link to the label volume-current-density is clearly broken and 
>>>> when 
>>>> >> I 
>>>> >> > get my html file it does nothing in particular. 
>>>> >> > 
>>>> >> > One solution I've seen is to convert the label references to the 
>>>> syntax 
>>>> >> > used by, e.g., pandoc-crossref, but this involves me editing the 
>>>> >> markdown 
>>>> >> > by hand. Is there an automatic way to convert these? 
>>>> >> > 
>>>> >> > -- 
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>>>> >> 
>>>> https://groups.google.com/d/msgid/pandoc-discuss/733e0d35-b1c4-4380-bf9f-7d6523c55162n%40googlegroups.com 
>>>> >> . 
>>>> >> 
>>>> > 
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>>>>
>>>>
>>>

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