pandoc-crossref-0.2.3.0: test/m2m/subfigures/expect.md
You can define subfigures:
<div id="fig:subfigures" class="subfigures">
{#fig:subfig1} {#fig:subfig2}

{#fig:subfig4} 
{#fig:subfig6}
{#fig:subfig7} 
{#fig:subfig9}
Figure 1: Caption. a — 1, b — 2, c — 3, d — 4, e — 5, f — 6, g — 7, h —
8, i — 9
</div>
<div id="fig:subfigures2" class="subfigures">
{#fig:subfig21}
{#fig:subfig22}

{#fig:subfig24}

{#fig:subfig26}
{#fig:subfig27}

{#fig:subfig29}
Figure 2: Caption. a — 1, b — 2, c — 3, d — 4, e — 5, f — 6, g — 7, h —
8, i — 9
</div>
Figures themselves can be referenced fig. 2, as well as individual
subfigures: figs. 1 (a), 1 (b), 2 (i)