Support definition lists (finally!)

[LesML] / TESTING / 📤 / keys-and-values

<?xml version="1.0"?>
<div xmlns="http://www.w3.org/1999/xhtml"><!-- document comment--><!-- this is allowed following the opening shebang--><article lang="en" xml:lang="en" data-lesml-profile="about:test"><footer class="head"><dl><div><dt>Key</dt><dd>Value</dd></div></dl><!--comm--><!--ent--><dl><div><dt/><dd>Key value</dd></div></dl><dl><div><dt>multiline</dt><dd>keyand value</dd></div></dl><dl><div><dt>bad spaced</dt><dd>key</dd></div></dl></footer><div class="body"/></article></div>