This plugin add a syntax highlighted editor to WordPress Post new/edit screen with Emmet (zen coding) engine. which takes something like ul.nav>li.nav-item$*4>a and turn it to :
<ul class="nav">
<li class="nav-item1"><a href=""></a></li>
<li class="nav-item2"><a href=""></a></li>
<li class="nav-item3"><a href=""></a></li>
<li class="nav-item4"><a href=""></a></li>
</ul>