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    <nav id="menu" role="navigation">
        <div class="brand">&Aopf;</div>            
        <ul>
            <li><a href="#">Item 1</a></li>
            <li><a href="#">Item 2</a></li>
            <li><a href="#">Item 3</a></li>
        </ul>
    </nav>
    <div class="page-wrap">
        <button id="menu-toggle"></button>
        <div class="container" role="main">
            <article>
                <h2>Vanilla Javascript push menu</h2>
                    <p>Sometimes you just need a really simple push menu, without any Javascript Libraries. I made this in a rush for a client with the instructions to not use any jQuery.</p>
                    <p>I like the thought of adding a class to the body and climb the DOM instead of adding classes to the affected elements.</p>
                    <p>Less is more.</p>
            </article>
      </div>
   </div>
            
          
!
            
              body {
    width: 100%;
    height: 100%;
    margin: 0;

    font-family: "Roboto", sans-serif;

    color: #fff;
    background-color: #232629;
}

p {
    line-height: 1.7;
}
h2 {
    margin-top: 30px;

    font-size: 1.7em;
    line-height: 1;

    letter-spacing: 2px;
    text-transform: uppercase;
}
/* PUSH MENU */
#menu {
    position: fixed;
    top: 0;
    left: -300px;

    width: 300px;
    height: 100%;
    padding: 50px 30px;
    -webkit-box-sizing: border-box;
       -moz-box-sizing: border-box;
            box-sizing: border-box;

    -webkit-transition: all .3s ease-in;
       -moz-transition: all .3s ease-in;
         -o-transition: all .3s ease-in;
            transition: all .3s ease-in;
    text-align: center;

    background-color: #fff;
}
#menu .brand {
    height: 51px;

    font-size: 70px;
    font-weight: 900;
    line-height: .6;

    color: #ddd;
}
#menu ul {
    padding: 0;
    margin-top: 30px;
}

#menu ul li a {
    display: block;

    font-weight: 900;
    line-height: 50px;

    -webkit-transition: all .3s ease;
       -moz-transition: all .3s ease;
         -o-transition: all .3s ease;
            transition: all .3s ease;
    text-decoration: none;
    text-transform: uppercase;

    color: #232629;
    border-top: 1px solid #eee;
}
#menu ul li:last-child a {
    border-bottom: 1px solid #eee;
}
#menu ul li a:hover {
    letter-spacing: 1px;
}
body.open #menu {
    left: 0;
}
/* MAIN PAGE */
.page-wrap {
   
    padding: 50px;
    -webkit-box-sizing: border-box;
       -moz-box-sizing: border-box;
            box-sizing: border-box;

    -webkit-transition: all .3s ease-in;
       -moz-transition: all .3s ease-in;
         -o-transition: all .3s ease-in;
            transition: all .3s ease-in;
}
body.open .page-wrap {
    margin-left: 300px;
}

/* MENU TOGGLE ICON */

button:focus {
    outline: none;
}
#menu-toggle {
    position: relative;

    width: 51px;
    height: 51px;

    cursor: pointer;

    border: none;
    -webkit-border-radius: 50px;
       -moz-border-radius: 50px;
            border-radius: 50px;
    background: #fff;
}
#menu-toggle:before,
#menu-toggle:after {
    position: absolute;

    content: "";
    content: "";
    -webkit-transition: all .5s ease;
       -moz-transition: all .5s ease;
         -o-transition: all .5s ease;
            transition: all .5s ease;

    background-color: #232629;
}

#menu-toggle:before {
    top: 12px;
    left: 25px;

    width: 1px;
    height: 27px;
}
#menu-toggle:after {
    top: 25px;
    left: 12px;

    width: 27px;
    height: 1px;
}

body.open button#menu-toggle:before,
body.open button#menu-toggle:after {
    -webkit-transform: rotate(45deg);
        -ms-transform: rotate(45deg);
            transform: rotate(45deg);
}
/* CONTENT CONTAINER */
.container {
    max-width: 600px;
    min-width: 200px;
    margin: 0 auto;
}

            
          
!
            
              
//Exelent little functions to use any time when class modification is needed
function hasClass(ele, cls) {
    return !!ele.className.match(new RegExp('(\\s|^)' + cls + '(\\s|$)'));
}

function addClass(ele, cls) {
    if (!hasClass(ele, cls)) ele.className += " " + cls;
}

function removeClass(ele, cls) {
    if (hasClass(ele, cls)) {
        var reg = new RegExp('(\\s|^)' + cls + '(\\s|$)');
        ele.className = ele.className.replace(reg, ' ');
    }
}

//Add event from js the keep the marup clean
function init() {
    document.getElementById("menu-toggle").addEventListener("click", toggleMenu);
}

//The actual fuction
function toggleMenu() {
    var ele = document.getElementsByTagName('body')[0];
    if (!hasClass(ele, "open")) {
        addClass(ele, "open");
    } else {
        removeClass(ele, "open");
    }
}

//Prevent the function to run before the document is loaded
document.addEventListener('readystatechange', function() {
    if (document.readyState === "complete") {
        init();
    }
});
            
          
!
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