<p>First a list with a tabbed line
</p>
<ul>
 <li><p>A
</p>

 </li>

 <li><p>B
</p>

 </li>
</ul>
<p>Just a blank line:
</p>
<ul>
 <li><p>A
</p>

 </li>

 <li><p>B
</p>

 </li>
</ul>
<p>Now a list with 4 spaces and some text:
</p>
<ul>
 <li>
     A
     abcdef
 </li>

 <li>
     B
 </li>
</ul>
<p>Now with a tab and an extra space:
</p>
<ul>
 <li><p>A
</p>

 </li>

 <li><p>B
</p>

 </li>
</ul>
<p>Now a list with 4 spaces:
</p>
<ul>
 <li><p>A
</p>

 </li>

 <li><p>B
</p>

 </li>
</ul>