when invoking Pandoc, like the <a href="https://github.com/jez/pandoc-markdown-css-theme/blob/27d0aa58bfc6eafe296e2cef1900a39c9c2507a7/tools/build.sh#L57">Makefile</a> for this project does:</p>
<pre><code>pandoc --filter pandoc-sidenote [...]</code></pre>
<p>With this filter active, the syntax for footnotes becomes the syntax for side notes and margin notes (specifically, it is no longer possible for the document to use footnotes).</p>
<pre><code>For example this is a side note[^example-side-note]. Side no