CSS Only Drop-Down Menu by Click

Discovered from an article on Ryan Collins' blog: http://www.ryancollins.me/?p=1041 & code was pulled from his demo: http://ryancollins.me/%7C/1041/demo.txt

by apasaja

HTML

<div id="demo">
    <div class="wrapper">
        <div class="content">
            <ul>
                <a href="#">
                    <li>Lorem ipsum dolor</li>
                </a>
                <a href="#">
                    <li>Consectetur adipisicing</li>
                </a>
                <a href="#">
                    <li>Reprehenderit</li>
                </a>
                <a href="#">
                    <li>Commodo consequat</li>
                </a>
            </ul>
        </div>
        <div class="parent">Drop Down Parent 1</div>
    </div>
</div>

CSS

#demo {
    /* margin: 30px 0 50px 0;
    font-family: Helvetica Neue, Helvetica, Arial, sans-serif; */
}

.wrapper {
    display: inline-block;
    width: 180px;
    margin: 0 10px 0 0;
    height: 20px;
    position: relative;
}

.wrapper .parent {
    height: 100%;
    width: 100%;
    display: block;
    cursor: pointer;
    line-height: 30px;
    height: 30px;
    border-radius: 5px;
    background: #F9F9F9;
    border: 1px solid #AAA;
    border-bottom: 1px solid #777;
    color: #282D31;
    font-weight: bold;
    z-index: 2;
    position: relative;
    -webkit-transition: border-radius .1s linear, background .1s linear, z-index 0s linear;
    -webkit-transition-delay: .8s;
    text-align: center;
}

.wrapper .parent:hover,
.wrapper .content:hover~.parent {
    background: #fff;
    -webkit-transition-delay: 0s, 0s, 0s;
}

.wrapper .content:hover~.parent {
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
    z-index: 0;
}

.wrapper .content {
    position: absolute;
    top: 0;
    display: block;
    z-index: 1;
    height: 0;
    width: 180px;
    padding-top: 30px;
    -webkit-transition: height .5s ease;
    -webkit-transition-delay: .4s;
    border: 1px solid #777;
    border-radius: 5px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, .4);
}

 .wrapper:active .content {
    height: 123px;
    z-index: 3;
    -webkit-transition-delay: 0s;
}

.wrapper .content:hover {
    height: 123px;
    z-index: 3;
    -webkit-transition-delay: 0s;
}

.wrapper .content ul {
    background: #fff;
    margin: 0;
    padding: 0;
    overflow: hidden;
    height: 100%;
    border-bottom-left-radius: 5px;
    border-bottom-right-radius: 5px;
}

.wrapper.content ul a {
    text-decoration: none;
}

.wrapper .content li:hover {
    background: #eee;
    color: #333;
}

.wrapper .content li {
    list-style: none;
    text-align: left;
    color: #888;
    font-size: 14px;
    line-height: 30px;
    height: 30px;
    padding-left: 10px;
    border-top: 1px...