Thanks for all the suggestions!

With the right settings, some horizontal rule syntaxes do indeed work:

% echo '___{.pause}' | pandoc --from=commonmark+attributes
<p><span class="pause">___</span></p>
% echo '***{.pause}' | pandoc --from=commonmark+attributes
<p><span class="pause">***</span></p>
% echo '---{.pause}' | pandoc --from=commonmark+attributes
<p>--<span class="pause">-</span></p>

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