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              <nav class="menu">
    <header>Menu <span>×</span></header>
    <ol>
        <li class="menu-item"><a href="#0">Home</a></li>
        <li class="menu-item"><a href="#0">About</a></li>
        <li class="menu-item">
            <a href="#0">Widgets</a>
            <ol class="sub-menu">
                <li class="menu-item"><a href="#0">Big Widgets</a></li>
                <li class="menu-item"><a href="#0">Bigger Widgets</a></li>
                <li class="menu-item"><a href="#0">Huge Widgets</a></li>
            </ol>
        </li>
        <li class="menu-item">
            <a href="#0">Kabobs</a>
            <ol class="sub-menu">
                <li class="menu-item"><a href="#0">Shishkabobs</a></li>
                <li class="menu-item"><a href="#0">BBQ kabobs</a></li>
                <li class="menu-item"><a href="#0">Summer kabobs</a></li>
            </ol>
        </li>
        <li class="menu-item"><a href="#0">Contact</a></li>
    </ol>
    <footer><button aria-label="Toggle Menu">Toggle</button></footer>
</nav> 
            
          
!
            
              @import url("https://fonts.googleapis.com/css?family=Open+Sans:400,400i,700");

* {
    font-family: 'Open Sans', sans-serif;
    box-sizing: border-box;
    color: #333;
    font-size: 100%;
    line-height: 1.5;
}
body {
    background: #9fcedf;
    margin: 0;
}
nav {
    --duration: .5s;
    --easing: ease-in-out;
    position: relative;
    width: 220px;
    margin: 20px;
    ol {
        list-style-type: none;
        margin: 0;
        padding: 0;
    }
    li {
        margin: -4px 0 0 0;
    }
    a {
        display: block;
        text-decoration: none;
        background: #fff;
        transform-origin: 0 0;
        transition: transform var(--duration) var(--easing), color var(--duration) var(--easing);
        transition-delay: var(--delay-out);
        border-radius: 4px;
        padding: 1em 1.52em;
        &:hover {
            background: #efefef;
        }
    }
    .sub-menu {
        a {
            font-size: .9em;
            color: #666666;
            border-left: 2em solid white;
            padding: .75em;
            background: linear-gradient(
                to right,
                #ddd 2px,
                #fff 2px
            );
            &:hover {
                background: linear-gradient(
                    to right,
                    #ddd 2px,
                    #efefef 2px
                );
            }
        }
    }
    header {
        font-weight: 600;
        display: block;
        background: rgba(255,255,255,.5);
        transform-origin: 0 0;
        transition: transform var(--duration) var(--easing), color var(--duration) var(--easing);
        transition-delay: var(--delay-out);
        border-radius: 4px;
        padding: 1em 1.52em;
        span {
            border: none;
            background: transparent;
            font-size: 1.5em;
            padding: 0;
            cursor: pointer;
            line-height: 1;
            float: right;
        }
    }
    footer button {
        position: absolute;
        top: 0;
        left: 0;
        border: none;
        padding: calc(~'1em - 2px');
        width: 100%;
        transform-origin: 0 0;
        transition: transform var(--duration) var(--easing);
        transition-delay: calc(~'var(--duration) + (.1s * (var(--count) / 2))');
        cursor: pointer;
        outline: none;
        background: #cdcdcd;
        opacity: 0;
    }
    &.closed {
        a, header {
            transform: translateY(~'calc(var(--top) * -1)') scaleY(0.1) scaleX(.2);
            transition-delay: var(--delay-in);
            color: transparent;
        }
        footer button {
            transition-delay: 0s;
            transform: scaleY(.7) scaleX(.2);
        }
    }
}
            
          
!
            
              var $els = $('.menu a, .menu header');
var count = $els.length;
var grouplength = Math.ceil(count/3);
var groupNumber = 0;
var i = 1;
$('.menu').css('--count',count+'');
$els.each(function(j){
    if ( i > grouplength ) {
        groupNumber++;
        i=1;
    }
    $(this).attr('data-group',groupNumber);
    i++;
});

$('.menu footer button').on('click',function(e){
    e.preventDefault();
    $els.each(function(j){
        $(this).css('--top',$(this)[0].getBoundingClientRect().top + ($(this).attr('data-group') * -15) - 20);
        $(this).css('--delay-in',j*.1+'s');
        $(this).css('--delay-out',(count-j)*.1+'s');
    });
    $('.menu').toggleClass('closed');
    e.stopPropagation();
});

// run animation once at beginning for demo
setTimeout(function(){
    $('.menu footer button').click();
    setTimeout(function(){
        $('.menu footer button').click();
    }, (count * 100) + 500 );
}, 1000);

            
          
!
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