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JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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HTML

            
              <nav>
	<ul>
		<li><a href="#0">Home</a></li>
		<li><a href="#0">About</a></li>
		<li>
			<a href="#0">Clients</a>
			<ul>
				<li>
					<a href="#0">Burger King</a>
					<ul>
						<li><a href="#0">Project 1</a></li>
						<li><a href="#0">Project 2</a></li>
						<li><a href="#0">Project 3</a></li>
					</ul>
				</li>
				<li>
					<a href="#0">Southwest Airlines</a>
					<ul>
						<li><a href="#0">Project 1</a></li>
						<li><a href="#0">Project 2</a></li>
						<li><a href="#0">Project 3</a></li>
					</ul>
				</li>
				<li>
					<a href="#0">Levi Strauss</a>
					<ul>
						<li><a href="#0">Project 1</a></li>
						<li><a href="#0">Project 2</a></li>
						<li><a href="#0">Project 3</a></li>
					</ul>
				</li>
			</ul>
		</li>
		<li>
			<a href="#0">Services</a>
			<ul>
				<li>
					<a href="#0">Print Design</a>
					<ul>
						<li><a href="#0">Subservice 1</a></li>
						<li><a href="#0">Subservice 2</a></li>
						<li><a href="#0">Subservice 3</a></li>
					</ul>
				</li>
				<li>
					<a href="#0">Web Design</a>
					<ul>
						<li><a href="#0">Subservice 1</a></li>
						<li><a href="#0">Subservice 2</a></li>
						<li><a href="#0">Subservice 3</a></li>
					</ul>
				</li>
				<li>
					<a href="#0">Mobile App Development</a>
					<ul>
						<li><a href="#0">Subservice 1</a></li>
						<li><a href="#0">Subservice 2</a></li>
						<li><a href="#0">Subservice 3</a></li>
					</ul>
				</li>
			</ul>
		</li>
		<li><a href="#0">Contact</a></li>
	</ul>
</nav>

<div id="content">
  <h1>Sidebar Navigation</h1>
  <h2>A Codepen Challenge</h2>

  <p>This Pen was made for the Navigation Challenge on Codepen in August 2019.</p>
  <p>Hover on the Burger-Menu to open the sidebar.</p>
  <p>Feel free to use this small example of a Sidebar Navigation in your project.</p>
</div>
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CSS

            
              /* Sidebar */

	/* Main-Wrapper */
	nav {
		position: fixed;
		width: 150px;
		left: -150px;
		top: 0;
		bottom: 0;
		background-color: rgba( 0, 0, 0, .9 );
		padding: 15px 0;
		transition: left 1s ease-in .5s;
	}
	nav:after {
		content: "\f0c9";
		font-family: "FontAwesome";
		font-weight: 400;
		font-style: normal;
		text-decoration: inherit;
		color: #ffffff;
		position: absolute;
		left: 100%;
		top: 0;
		padding: 15px;
		background-color: rgba( 0, 0, 0, .9 );
		border-bottom-right-radius: 5px;
		cursor: pointer;
	}
	nav:hover {
		left: 0;
		transition: left 1s ease-in 0s;
	}
	nav:hover:after {
		content: "\f00d";
	}

	/* Global Styles */
	nav ul a {
		color: #ffffff;
		text-decoration: none;
		padding-left: 25px;
		display: block;
	}
	nav ul a:after {
		content: "\f054";
		font-family: "FontAwesome";
		display: block;
		position: absolute;
		left: 15px;
		top: 13px;
		font-size: 12px;
	}
	nav ul {
		list-style-type: none;
		padding: 0;
		margin: 0;
	}
	nav ul li {
		position: relative;
	}
	nav ul li a {
		padding: 10px 5px;
		padding-left: 30px;
	}
	nav ul li:hover {
		background-color: rgba( 0, 150, 255, 1 );
	}

	/* First-Level Navigation */
	nav > ul {
		margin-top: 32px;
	}

	/* Multi-Level Navigation */
	nav ul li > ul {
		position: absolute;
		background-color: rgba( 0, 0, 0, .9 );
		width: 100%;
		top: 1999px;
		left: 100%;
		transition: top .5s;
	}
	nav ul li > ul li {
		min-width: 120px;
	}
	nav ul li:hover > ul,
	nav ul li > ul:hover {
		top: 0%;
	}
  
  /* Alternative Style */
  /* Looks good, but a bit unhandy */
  /*
    nav ul li > ul {
        position: unset;
        background-color: transparent;
        margin-left: 10px;
        max-height: 0;
        transition: max-height .5s;
        overflow: hidden;
    }
    nav ul li:hover > ul {
        max-height: 999px;
        overflow: visible;
    }

    nav ul li {
        background-color: rgba( 0, 0, 0, .4 );
    }
    nav ul li:hover {
        background-color: rgba( 0, 150, 255, .4 );
    }
  /**/

/* Other CSS */
body {
	font-family: Arial, sans-serif;
}
#content {
	text-align: center;
	margin: 100px 0;
}
h1 {
	margin-bottom: 10px;
}
h2 {
	margin-top: 10px;
}
p {
	margin: 0 0 10px 0;
}
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