Recursive Hover Nav ( Only CSS )

index.html

<nav>
		<menu>
			<menuitem id="demo1">
				<a>drop</a>
				<menu>
					<menuitem><a>about</a></menuitem>
               <menuitem>
                  <a>settings</a>
                  <menu>
                     <menuitem><a>Test 1</a></menuitem>
                     <menuitem><a>Test 2</a></menuitem>
                     <menuitem><a>Test 3</a></menuitem>
                     <menuitem><a>Test 4</a></menuitem>
                  </menu>  
               </menuitem>
					<menuitem><a>help</a></menuitem>
					<menuitem id="demo2">
						<a>more</a>
						<menu>
							<menuitem id="demo3">
								<a>deeper</a>
								<menu>
									<menuitem><a>deep 1</a></menuitem>
									<menuitem><a>deep 2</a></menuitem>
									<menuitem><a>deep 3</a></menuitem>
								</menu>
							</menuitem>
							<menuitem><a>test</a></menuitem>
						</menu>
					</menuitem>
				</menu>
			</menuitem>
         <menuitem><a>no drop</a></menuitem>
		</menu>
	</nav>

recursive-hover-nav-only-css.markdown

Recursive Hover Nav ( Only CSS )

A Pen by sean_codes on CodePen.

License.

script.js

// For the thumbnail demo! :]

var count = 1
setTimeout(demo, 500)
setTimeout(demo, 700)
setTimeout(demo, 900)
setTimeout(reset, 2000)

setTimeout(demo, 2500)
setTimeout(demo, 2750)
setTimeout(demo, 3050)


var mousein = false
function demo() {
   if(mousein) return
   document.getElementById('demo' + count++)
      .classList.toggle('hover')
   
}

function demo2() {
   if(mousein) return
   document.getElementById('demo2')
      .classList.toggle('hover')
}

function reset() {
   count = 1
   var hovers = document.querySelectorAll('.hover')
   for(var i = 0; i < hovers.length; i++ ) {
      hovers[i].classList.remove('hover')
   }
}

document.addEventListener('mouseover', function() {
   mousein = true
   reset()
})

style.css

html, body{
   padding:0px;
   margin:0px;
   background:#191A1D;
   font-family: 'Karla', sans-serif;
   width:100vw;
}
body * {
   margin:0;
   padding:0;
}

/* HTML Nav Styles */
/* HTML Nav Styles */
/* HTML Nav Styles */
nav menuitem {
   position:relative;
   display:block;
   opacity:0;
   cursor:pointer;
}

nav menuitem > menu {
   position: absolute;
   pointer-events:none;
}
nav > menu { display:flex; }

nav > menu > menuitem { pointer-events: all; opacity:1; }
menu menuitem a { white-space:nowrap; display:block; }
   
menuitem:hover > menu {
   pointer-events:initial;
}
menuitem:hover > menu > menuitem,
menu:hover > menuitem{
   opacity:1;
}
nav > menu > menuitem menuitem menu {
   transform:translateX(100%);
   top:0; right:0;
}
/* User Styles Below Not Required */
/* User Styles Below Not Required */
/* User Styles Below Not Required */

nav { 
   margin-top: 40px;
   margin-left: 40px;
}

nav a {
   background:#75F;
   color:#FFF;
   min-width:190px;
   transition: background 0.5s, color 0.5s, transform 0.5s;
   margin:0px 6px 6px 0px;
   padding:20px 40px;
   box-sizing:border-box;
   border-radius:3px;
   box-shadow: 0px 2px 4px rgba(0, 0, 0, 0.5);
   position:relative;
}

nav a:hover:before {
   content: '';
   top:0;left:0;
   position:absolute;
   background:rgba(0, 0, 0, 0.2);
   width:100%;
   height:100%;
}

nav > menu > menuitem > a + menu:after{
   content: '';
   position:absolute;
   border:10px solid transparent;
   border-top: 10px solid white;
   left:12px;
   top: -40px;  
}
nav menuitem > menu > menuitem > a + menu:after{ 
   content: '';
   position:absolute;
   border:10px solid transparent;
   border-left: 10px solid white;
   top: 20px;
   left:-180px;
   transition: opacity 0.6, transform 0s;
}

nav > menu > menuitem > menu > menuitem{
   transition: transform 0.6s, opacity 0.6s;
   transform:translateY(150%);
   opacity:0;
}
nav > menu > menuitem:hover > menu > menuitem,
nav > menu > menuitem.hover > menu > menuitem{
   transform:translateY(0%);
   opacity: 1;
}

menuitem > menu > menuitem > menu > menuitem{
   transition: transform 0.6s, opacity 0.6s;
   transform:translateX(195px) translateY(0%);
   opacity: 0;
} 
menuitem > menu > menuitem:hover > menu > menuitem,  
menuitem > menu > menuitem.hover > menu > menuitem{  
   transform:translateX(0) translateY(0%);
   opacity: 1;
}

styles

<link href="https://fonts.googleapis.com/css?family=Karla" rel="stylesheet" />
<link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.css" rel="stylesheet" />