Support definition lists (finally!)

[LesML] / TESTING / 📤 / hr

<?xml version="1.0"?>
<div xmlns="http://www.w3.org/1999/xhtml"><article lang="en" xml:lang="en"><div class="body"><blockquote><blockquote data-level="1"><blockquote data-level="2"><hr data-source-text="***"/></blockquote></blockquote></blockquote><hr data-source-text="&#x2619; &#x2042; &#x2767;"/></div></article></div>