List is tight, if all `dt`s are tight.
......

Term 1
: foo
: bar

Term 2
: foo

: bar

......

<dl data-sourcepos="1:1-8:5">
<dt data-sourcepos="1:1-1:6">Term 1</dt>
<dd data-sourcepos="2:3-2:5">
<p data-sourcepos="2:3-2:5">foo</p>
</dd>
<dd data-sourcepos="3:3-4:0">
<p data-sourcepos="3:3-3:5">bar</p>
</dd>
<dt data-sourcepos="5:1-5:6">Term 2</dt>
<dd data-sourcepos="5:1-7:0">
<p data-sourcepos="6:3-6:5">foo</p>
</dd>
<dd data-sourcepos="8:3-8:5">
<p data-sourcepos="8:3-8:5">bar</p>
</dd>
</dl>