resolve #16

tests/data/dense_list.html

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+<p>Here's a regular list:</p>
+<ul>
+<li>list item</li>
+<li>another list item</li>
+<li>3rd list item</li>
+</ul>
+<p>Here's one with white space around items:</p>
+<ul>
+<li>list item  </li>
+<li>another list item  </li>
+</ul>
+<p>Here's one with too much space before items:</p>
+<pre><code>- list item
+- another list item</code></pre>
+<p>Here's one with no space after markers:</p>
+<p>-list item
+-another list item</p>
+<p>Here's one where items contain line breaks:</p>
+<ul>
+<li>list
+item</li>
+<li>another
+list item</li>
+</ul>