parent item drop up with sub menu - html

Question

hello is it possible that when I hover to the parent item the parent item will also slide up making the drop down menu with parent item above it? here is my code but I cant seem to make it work. here is a visual menu that i want http://imgur.com/om9mvdG (the second image)
.nav ul {
*zoom: 1;
list-style: none;
margin: 0;
padding: 0;
background: #333;
}
.nav ul:before,
.nav ul:after {
content: "";
display: table;
}
.nav ul:after {
clear: both;
}
.nav ul > li {
float: left;
position: relative;
}
.nav a {
display: block;
padding: 10px 20px;
line-height: 1.2em;
color: #fff;
border-left: 1px solid #595959;
}
.nav a:hover {
text-decoration: none;
background: #595959;
}
.nav li ul {
background: #273754;
position: absolute;
left: 0;
bottom: 36px;
z-index: 1;
}
.nav li ul li {
width: 100%;
overflow: hidden;
height: 0;
-webkit-transition: height 200ms ease-in;
-moz-transition: height 200ms ease-in;
-o-transition: height 200ms ease-in;
transition: height 200ms ease-in;
}
.nav li ul a {
border: none;
}
.nav li ul a:hover {
background: rgba(0, 0, 0, 0.2);
}
.nav ul > li:hover ul li {
height: 36px;
}
<ul>
<li>
Nav Item
<ul>
<li>Subnav
</li>
<li>Subnav
</li>
<li>Subnav
</li>
</ul>
</li>
<li>
Nav Item
<ul>
<li>Subnav
</li>
<li>Subnav
</li>
<li>Subnav
</li>
</ul>
</li>
</ul>
</nav>

Answer 1

Add this css to your already existing code. Is this what you wanted?
http://codepen.io/anon/pen/jbBgdg
li>ul {
display: none;
}
a:hover~ul {
display: block;
}