The documented syntax for reveal.js columns plays well with pandoc-crossref 
subfigures for HTML (and, I suppose, EPUB) output:

:::::: {.columns #fig:mainFigure}
::: {.column}
![First subfigure](){#fig:subFigureA}
::: <!-- close first column -->
::: {.column}
![Second subfigure(){#fig:subFigureB}
::: <!-- close second column -->
General caption
:::::: <!-- close column layout -->

Then add `div.column { float: left; }` to your CSS.

Cheers,
Pedro.

Em sábado, 10 de abril de 2021 às 18:58:52 UTC+1, emil.t...@gmail.com 
escreveu:

> Hi,
> I'd like to have two subfigures side-by-side. I'm using the 
> pandoc-crossref filter method of subfigures. I tried turning them into a 
> subsubfigure, and also the column layout method as described in 
> https://bookdown.org/yihui/rmarkdown-cookbook/multi-column.html . Does 
> anybody know a way?
> Thanks for your contributions to the pandoc paradigm
> Emil
>

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