<!DOCTYPE html>
<html>
<head>
    <title>ttwf-reftest-alignContent-ref</title>
    <link rel="author" title="Heechang Kang" href="mailto:hckang80@gmail.com">
    <link rel="help" href="http://www.w3.org/TR/css3-align/#content-distribution">
    <style type="text/css">
        #main{
            display:flex;
            flex-flow:row wrap;
            align-content:space-around;
            position:relative;
            width:70px;
            height:170px;
            border:1px solid #c3c3c3;
        }
        #main .sample{
            position:absolute;
            left:0;
            top:50%;
            z-index:-1;
            margin:-35px 0 0;
        }
        #main > span{
            display:inline-block;
            width:70px;
            height:70px;
            vertical-align:middle;
        }
    </style>
</head>
<body>
<p>PASS if there is no red box.</p>
<div id="main">
    <span class="sample" style="background-color:red;"></span>
    <span style="background-color:green;"></span>
</div>
</body>
</html>