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HTML 

              
                <div class="sitenavigation">
	<span class="menu-icon"> 
		<span class="line"></span> 
		<span class="line"></span>
		<span class="line"></span>	 
	</span>

	<ul>
		<li><a href="#">First Item</a></li>
		<li class="nav-dropdown"><a href="#">Second Item</a>
			<ul>
				<li><a href="#">First Sub-nav item</a></li>
        <li><a href="#">Second Sub-nav item</a></li>
        <li class="nav-dropdown"><a href="#">Third Sub-nav item</a>
          <ul>
            <li><a href="#">Third level nav item</a></li>
            <li><a href="#">Third level nav item</a></li>
          </ul>
        </li>
        
        <li><a href="#">Forth Sub-nav item</a></li>
			</ul>
		</li>
    <li class="nav-dropdown"><a href="#">Third Item</a>
			<ul>
				<li><a href="#">Nav item</a></li>
        <li class="nav-dropdown"><a href="#">Nav item</a>
          <ul>
            <li><a href="#">Nav item</a></li>
             
          </ul>
        </li>
         <li class="nav-dropdown"><a href="#">Third Sub-nav item</a>
          <ul>
            <li><a href="#">Third level nav item</a></li>
             
          </ul>
        </li>
        
        <li><a href="#">Forth Sub-nav item</a></li>
			</ul>
		</li>
		<li><a href="#">Forth Item</a></li>
	</ul>
</div>
!

CSS 

              
                @import "compass/css3";

$phones: "only screen and (max-width : 420px)";

// turn on indicators on drop down menu (non-mobile)
$showindicators: true;

// ### DROP DOWN STYLES ###

// width of drop down menus
$sub-min-width: 200px;
$sub-max-width: 300px;

$font-size: 12px;
$line-height: 20px;
$padding: 10px;

// horizontal space between nav items at top level
$drop-nav-spacing: 10px;

$drop-item-text-color: #FFF;
$drop-item-back-color: #a91e2f;
$drop-item-font: Arial, san-serif;

$drop-item-text-hover-color: #000;
$drop-item-back-hover-color: #CCC;

$drop-item-text-color-selected: #000;
$drop-item-back-color-selected: #777;

$drop-indicators-color: #FFF;
$drop-indicators-size: 12px;


// ### MOBILE NAVIGATION STYLES ###

// veticale gap between expanded mobile menu and top of browser
$mobile-heading-gap: 80px;

$mobile-font-size: $font-size;
$mobile-item-font: $drop-item-font;
$mobile-line-height: $line-height;

// size allocated for tap area to trigger sub menus
$mobile-sub-width: 20%;

$mobile-indicators-color: #000;
$mobile-indicators-back-color: #FFF; 

//mobile button 
$button-markers: #FFF;
$button-back: #AAA;
 
// ### DROP DOWN ### 
.sitenavigation {
  ul {
   margin: 0;
    padding: 0;
  }
  
  li {
		list-style-type: none;
		padding: 0;
		margin: 0;
		float: left;
		margin-right: $drop-nav-spacing; // spacing between nav items
		font-size: $font-size;
    
		line-height: $line-height;
		 
		// how items with sub-menus appear when showing subs, most likely same as normal hover
		&.nav-dropdown:hover > a {
			background-color: $drop-item-back-hover-color !important;
			color: $drop-item-text-hover-color;
		}
		 
		// top level items
		a {
			background-color: $drop-item-back-color;
			color: $drop-item-text-color;
      font-family: $drop-item-font;
			text-decoration: none;
			display: block; 
			padding: $padding;
			-webkit-tap-highlight-color: transparent;
			
      // nav-path-selected and nav-selected are classes to indicate current site location
			&.nav-path-selected, &.linkclicked {
				color: white;
				background-color: $drop-item-back-color;	
			}
			
			&.nav-selected {
				background-color: $drop-item-back-color-selected;
				color: $drop-item-text-color-selected;
			}
			
			&:hover {
				background-color: $drop-item-back-hover-color !important;
				color: $drop-item-text-hover-color;
			}
		}
		
		&.clicked > ul {  // used for JS/touch trigger
			display: block; 
		}
		
		// second level drop downs
		ul {
			display: none;	
			position: absolute;	 
			min-width: $sub-min-width;
			max-width: $sub-max-width;
			padding: 0;
			margin: 0;
			
			a {
				background-color: darken($drop-item-back-color, 5%);
			}
			
			li {
				float: none;	
				margin: 0;
			}
			
			// third level drop downs, expand to the right
			ul {
				left: 100%;
				margin-top: -($line-height + 2*$padding);
				
				a {
					background-color: darken($drop-item-back-color, 10%);
				}
			}
		}
			 
	}
	
	.nav-dropdown:hover > a, .nav-dropdown.clicked > a	 {
		background-color: $drop-item-back-color;
	}
	
	 @if $showindicators {
		.nav-dropdown > a:after {
			content: '▼' !important;
			font-size: 10px;
			float: right;
			margin-left: 10px;
			color: $drop-indicators-color;
		}
		
		.nav-dropdown:hover > a:after {
			content: '▲' !important;
			font-size: 10px;	
			float: right;
			margin-left: 10px;
			color: $drop-indicators-color;
		}
	 }
}
 
// non javascript expand of menu on hover (fallback)
.no-js .sitenavigation {
	li {
		&:hover > ul {
			display: block !important;	
		}
	}
}


// default of mobile menu button, needed for javascript to detect if visible
.menu-icon {
	display: none;	
}


// ### MOBILE NAV AND MENU BUTTON ### 
@media #{$phones} {
	  .menu-icon {
		width:	30px;
		height: 25px;
		padding-top:  0;
		margin-top: 10px;
		display: block;
		float: right;
		-webkit-tap-highlight-color: rgba(0,0,0,0);
		background-color: $button-back;
		padding: 5px;
		padding-top: 1px;
		padding-bottom: 12px;
		border: solid 2px darken($button-back, 5%);
		margin-bottom: 10px;

		span {
			display: block;
			height: 5px;
			background-color: $button-markers;
			margin-top:	 5px;
			border-radius: 4px;		
		}
		
	} 
	
	.sitenavigation.is-tapped .menu-icon {
		background-color: darken($button-back, 20%);
		-webkit-tap-highlight-color: rgba(0,0,0,0);
		
		span {
			background-color: darken(#FFF,30%);
		}
	}
	
	.sitenavigation ul {
		display: none;
		max-width: none !important;
	}
	
	.sitenavigation li {
		float:	none;
		display: block;
		margin: 0;
		padding: 0;
	}
	
	
	.sitenavigation.is-tapped  > ul {
		display:  block;
		position: absolute;
		margin: 0;
		background-color: $mobile-indicators-back-color;
		right: 0;
		left: 0;
		top: $mobile-heading-gap;
		z-index: 100;
		padding: 0;
		
		a {
			@include box-sizing(border-box);
			width: 100%;
			margin: 0;
			background-color: $drop-item-back-color;
			display: block;
			padding-top: $padding;
			padding-bottom: $padding;
			padding-left: 20px;
			padding-right: 20px;
			height: auto;
			color: $drop-item-text-color;
			float: none;
			font-size: $mobile-font-size;
			line-height: $mobile-line-height;
      font-family: $mobile-item-font;
			
			border: none !important;
			-webkit-font-smoothing: antialiased;
			-webkit-tap-highlight-color: transparent;
			
			&:hover {
				background-color: $drop-item-text-hover-color;
			}	
			
		}
		
		li {
			width: 100%;
			background-color: $mobile-indicators-back-color;
			border-bottom: solid 1px darken($drop-item-back-color, 20%);
			-webkit-tap-highlight-color: transparent;
			
			li {
				background-color: darken($mobile-indicators-back-color, 20%);	
			}
		}
		
		
		
		ul {
			display: none;
			width: 100%; 
			z-index: 200;
			border: none;
			margin-left: 0;
			padding: 0;
			position: relative !important;
			 
			ul {
				clear: both;
				left: 0;
				margin-top: 0; 
			} 
			
			li {
				border-bottom: solid 1px darken($drop-item-back-color, 5%);
				
				li a {
					background-color: darken($drop-item-back-color, 30%);
					padding-left: 30px;
				}
			}
			
			a {
				background-color: darken($drop-item-back-color, 10%);
				font-size: 90%;
				padding-left: 20px;
				
				&:before {
					content: '↳';
					display: inline-block;
					margin-right: 4px;
					color: $mobile-indicators-color;
					font-family: Arial;
				}
			}
			
		}
		
		
		// create space for indicator	
		li.nav-dropdown {
			cursor: pointer;
			
			&>a {
				width: 100% - $mobile-sub-width;
			}
			 
		}
		
		
		li.nav-dropdown:after {
			content: '▼';
			position: absolute;
			color: $mobile-indicators-color;
			padding: 0;
			display: block;
			width: $mobile-sub-width;
			right: 0;
			margin-top: -($line-height + 2*$padding);
			text-align: center;
			font-size: $drop-indicators-size;
			padding-top: $padding;
			padding-bottom: $padding;
			@include box-sizing(border-box);
		}
		
		li.expanded:after {
			display: none;
		}
		
		li.expanded li:first-child:before {
			content: '▲' !important;
			position: absolute;
			color: darken($mobile-indicators-color, 20%);
			padding: 0;
			display: block;
			width: $mobile-sub-width;
			right: 0;
			margin-top: -($line-height + 2 *$padding);
			text-align: center;
			font-size: $drop-indicators-size;
			padding-top: $padding;
			padding-bottom: $padding;
			@include box-sizing(border-box);
			  
		}
	
		 @if $showindicators {
			// remove unnecessary indicators on mobiles
			.nav-dropdown > a:after {
				content: '' !important;
			}
			
			.nav-dropdown:hover > a:after {
				content: '' !important;
			}  
		}
		
	}
}
!

JS 

              
                // on document ready
$(document).ready(function() { 
 	
 	// show/hide the mobile menu based on class added to container
	$('.menu-icon').click(function(){
		$(this).parent().toggleClass('is-tapped');
		 return false;
	});

  	// handle touch device events on drop down, first tap adds class, second navigates
 	$('.touch .sitenavigation li.nav-dropdown > a').on('touchend',
		function(e){
	    if ($('.menu-icon').is(':hidden')) {
		  	var parent = $(this).parent();
			  $(this).find('.clicked').removeClass('clicked');
	 			if (parent.hasClass('clicked')) {
					 window.location.href = $(this).attr('href');
				} else {
	 				$(this).addClass('linkclicked');
	 				
          // close other open menus at this level
	 			  $(this).parent().parent().find('.clicked').removeClass('clicked');
          
          parent.addClass('clicked');
					e.preventDefault();
				}
			}	
	});
 	
 	// handle the expansion of mobile menu drop down nesting
   	$('.sitenavigation li.nav-dropdown').click(
  		function(event){
  			if(event.stopPropagation) {
  				event.stopPropagation();
  			} else {
  				event.cancelBubble = true;	
  			}
  			
  			if ($('.menu-icon').is(':visible')) {
  				$(this).find('> ul').toggle();
  				$(this).toggleClass('expanded');
  			}
  		 }
  	);
  	
  	
  	// prevent links for propagating click/tap events that may trigger hiding/unhiding 
  	$('.sitenavigation a.nav-dropdown, .sitenavigation li.nav-dropdown a').click(
  		function(event){
 			if(event.stopPropagation) {
 				event.stopPropagation();
 			} else {
 				event.cancelBubble = true;	
 			}
  		}
  	);
  	
  	// javascript fade in and out of dropdown menu
  	$('.no-touch .sitenavigation li').hover(
	  	function() {
	  		if (!$('.menu-icon').is(':visible')) {
	  		 	$(this).find('> ul').fadeIn(150);
	  		}
	  	},
	  	function() {
	  		if (!$('.menu-icon').is(':visible')) {
	  			 $(this).find('> ul').fadeOut(150);
	  		}
	  	}	
  	);
});
!
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