<section>...</section>とか書いてもその中もMarkdownとして処理するやつ

recursive-marked.js

#!/usr/bin/env node

"use strict";

var marked = require("marked");

var md = `# Main Section

This is a paragraph.

<section>
# Sub Section

This is a paragraph in sub section.
</section>

<figure>
> This is a quoted paragraph in figure element.

<figcaption>— John Doe</figcaption>
</figure>

End of test.
`;
var renderer = new marked.Renderer();

function html(html) {
  var attributes;
  var contents;
  var tag;
  var tokens = html.trim().match(/^<(\w+)(.*?)>([\s\S]*)<\/\1>/);
  var tags = ["aside", "figure", "section"];

  tag = tokens[1];

  if (tags.indexOf(tag) === -1) {
    return html;
  }

  attributes = tokens[2];
  contents = marked(tokens[3].replace(/&gt;/g, ">"), {
    renderer: renderer
  }).trim();

  return "<" + tag + attributes + ">\n" + contents + "\n</" + tag + ">\n";
}

renderer.html = html;
console.log(marked(md, {
  renderer: renderer
}));

test.md

デフォルトではsection要素などを使うとその中はMarkdownとしてはうまく処理されない（インラインの記法だけ処理される）。

<h1 id="main-section">Main Section</h1>
<p>This is a paragraph.</p>
<section>
# Sub Section

This is a paragraph in sub section.
</section>

<figure>
&gt; This is a quoted paragraph in figure element.

<figcaption>— John Doe</figcaption>
</figure>

<p>End of test.</p>

それが、こうなりだいたいうまく処理される。

<h1 id="main-section">Main Section</h1>
<p>This is a paragraph.</p>
<section>
<h1 id="sub-section">Sub Section</h1>
<p>This is a paragraph in sub section.</p>
</section>
<figure>
<blockquote>
<p>This is a quoted paragraph in figure element.</p>
</blockquote>
<figcaption>— John Doe</figcaption>
</figure>
<p>End of test.</p>