how to add SubMenu to vertical submenu using html and css - html

Question

I am developing a application which has vertical sub menu .I want to add the sub menu to already existing vertical Sub menu how to add Sub Menu to vertical sub menu using HTML and CSS?

Answer 1

Example for vertical submenu:
HTML:
<h1>Vertical Submenu</h1>
<nav id="primary_nav_wrap">
<ul>
<li>Menu 1
<ul>
<li>Sub Menu 1</li>
<li>Sub Menu 2</li>
<li>Sub Menu 3</li>
<li>Sub Menu 4
<ul>
<li>Deep Menu 1
<ul>
<li>Sub Deep 1</li>
<li>Sub Deep 2</li>
<li>Sub Deep 3</li>
<li>Sub Deep 4</li>
</ul>
</li>
<li>Deep Menu 2</li>
</ul>
</li>
<li>Sub Menu 5</li>
</ul>
</li>
</ul>
</nav>
CSS:
#primary_nav_wrap
{
margin-top:15px
}
#primary_nav_wrap ul
{
list-style:none;
position:relative;
float:left;
margin:0;
padding:0
}
#primary_nav_wrap ul a
{
display:block;
color:#333;
text-decoration:none;
font-weight:700;
font-size:12px;
line-height:32px;
padding:0 15px;
font-family:"HelveticaNeue","Helvetica Neue",Helvetica,Arial,sans-serif
}
#primary_nav_wrap ul li
{
position:relative;
float:left;
margin:0;
padding:0
}
#primary_nav_wrap ul li.current-menu-item
{
background:#ddd
}
#primary_nav_wrap ul li:hover
{
background:#f6f6f6
}
#primary_nav_wrap ul ul
{
display:none;
position:absolute;
top:100%;
left:0;
background:#fff;
padding:0
}
#primary_nav_wrap ul ul li
{
float:none;
width:200px
}
#primary_nav_wrap ul ul a
{
line-height:120%;
padding:10px 15px
}
#primary_nav_wrap ul ul ul
{
top:0;
left:100%
}
#primary_nav_wrap ul li:hover > ul
{
display:block
}
FIDDLE