Animate Height

Also includes animating with psuedo element.

by Matthew Day

HTML

<div class="parent">
    <div class="title">Title</div>
    <ul class="child">
        <li class="first">John</li>
        <li>Peter</li>
        <li>James</li>        
    </ul>
</div>

CSS

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    background: gray;
    color: white;
    font-family: arial;
    text-transform: uppercase;
}

.parent {
    width: 200px;
    margin: 20px auto 0;
}

.title {
    padding: 4px;
    border: 1px solid rgba(255,255,255,.2);
    text-align: center;
}

.child {
    height: 0;
    max-height: 0;
    background: black;
    overflow: hidden;
    text-align: center;
    -webkit-transition: all 500ms cubic-bezier(1.000, 0.000, 0.005, 1.005);
}

.child.active {
    height: 500px;
    max-height: 500px;
}

li {
    margin-top: 20px;
    padding: 2px 0 2px 20px;
    width: 100%;
    list-style-type: none;
    opacity: 1;
    -webkit-transition: all 800ms ease-in-out;
    text-align: left;
    background: inherit;
    color: #1391ff;
    letter-spacing: 4px;
}

li.active {
    margin-top: 10px;
    opacity: 1;
}

.first {
    position: relative;
    color: white;
}

.first:before {
    position: absolute;
    content: '|';
    top: 0;
    left: -5px;
    transition: all 400ms cubic-bezier(0.570, -0.540, 0.450, 1.570);
}

.first.active:before {
    left: 5px;
}

JavaScript

$('.title').click(function() {
    $('.child').toggleClass('active');
    $('li').toggleClass('active');
});