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HTML 

              
                 <!-- We now give the menu a class as well as an id, we'll change the class with JavaScript to alter the styleing -->
	<ul id="menu" class="menu-up">
    <!-- We also give the menu items a class -->
		<li><a href="#about" class="menu-link">About Me</a></li>
		<li><a href="#portfolio" class="menu-link">Portfolio</a></li>
		<li><a href="#blog" class="menu-link">Blog</a></li>
	</ul>
 
  <!-- The wrapper gets a class too -->
	<div id="wrapper" class="wrapper-up">

		<header>
      
        <!-- clicking this word will check and uncheck the checkbox -->
			<p id="show-menu">Menu</p>

			<h1>Mobile Push Menu With JavaScript</h1>
			<p>Click on the word Menu above to open or close the menu.</p>
      
        <p>This JavaScript push-down menu resolves the issues we had with pure CSS. The menu will now close when we click a menu item. The ability to change the class of an ID allows us to have more than two states. The 'off' state allows us to hide the menu without animating the transition.</p>
		</header>

		<section id="about">
			<h2>About Me</h2>
			
		</section>

		<section id="portfolio">
			<h2>Portfolio</h2>
			
		</section>

		<section id="blog">
			<h2>Blog</h2>
			
		</section>

	</div>
!

CSS 

              
                /* We move the positioning and the transition into the menu and wrapper's various classes because they're subject to change. */
#menu {
	position: absolute;
}
#wrapper {	
	position: relative;
}

/* The 'up' classes are the default state where the elements are positioned on page load */
.menu-up {
	-webkit-transition: top .3s ease-in;
	transition: top .3s ease-in;
  
  top: -5em;
}
.wrapper-up {
	-webkit-transition: top .3s ease-in;
	transition: top .3s ease-in;
  
  top: 0;
}

/* The 'down' classes shift the elements when the menu button is clicked. */
.menu-down {
	-webkit-transition: top .3s ease-in;
	transition: top .3s ease-in;
  
  top: 0em;
}
.wrapper-down {
	-webkit-transition: top .3s ease-in;
	transition: top .3s ease-in;
  
  top: 5em;
}

/* The 'off' classes move the menu to the same position as the off. The difference is we turn off the transition so that the canvas doesn't scroll up after we jump to a link further down the page. */
.menu-off {
	-webkit-transition-property: none;
	transition-property: none;
  
  top: -5em;
}
.wrapper-off {
	-webkit-transition-property: none;
	transition-property: none;
  
  top: 0em;
}



/* Unnecessary styling stuff */
#menu {
	background-color: #FAD89B;
   width: calc(100% - 56px);
}
header, section {
	height: 500px;
}
header {
	background-color: #B598A2;
}
#about {
	background-color: #73799E;
}
#portfolio {
	background-color: #809E90;
}
#blog {
	background-color: #BCBD9C;
}
!

JS 

              
                //this function toggles the menu and wrapper between up and down positions
document.getElementById("show-menu").onclick=function toggleMenu() {
	if (document.getElementById("menu").className == "menu-up" 
	|| document.getElementById("menu").className == "menu-off") {
		document.getElementById("menu").className = "menu-down";
		document.getElementById("wrapper").className = "wrapper-down";
	} else {
		document.getElementById("menu").className = "menu-up";
		document.getElementById("wrapper").className = "wrapper-up";
	}
}

//Because there are multiple menu links, getElementsByClassName returns an array containing the three menu links.
var menuLinkClick = document.getElementsByClassName("menu-link");

//this for loop applies an event listener to each menu link which calls function menuUp when a link is clicked
for (i=0; i<=3; i++) {
	if (menuLinkClick[i]) {
		menuLinkClick[i].addEventListener("click", menuUp);
	}
}

//this function sets the menu and wrapper to their 'off' classes. Returning them to their default positions without animating the transition.
function menuUp() {
	document.getElementById("menu").className = "menu-off";
	document.getElementById("wrapper").className = "wrapper-off";
}
!
999px

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