<!DOCTYPE html>
<html>
<head>
<title>CSS Test: flex flow direction</title>
<link rel="author" title="houzhenyu" href="http://www.github.com/sskyy" />
<link rel="help" href="http://www.w3.org/TR/css-flexbox-1/#flex-direction">
<link rel="match" href="reference/flex-direction-modify.html">
<meta name="assert" content="Changing 'flex-direction' with JavaScript and then changing it back should returns to the original look." />
<style>
    .flex-container{
        display: flex;
        margin:20px;
        background: #333;
    }
    .flex-item{
        width:50px;
        height:50px;
        margin:20px;
        background: #eee;
        line-height: 50px;
        text-align: center;
    }
    
    
    .flex-container.flex-direction-row{
        flex-direction : row;
    }
    
    .flex-container.flex-direction-row-reverse{
        flex-direction : row-reverse;
    }
    
    .flex-container.flex-direction-column{
        flex-direction : column;
    }
    .flex-container.flex-direction-column-reverse{
        flex-direction : column-reverse;
    }
</style>
</head>
<body>
    <h1>flex-direction:<span id="current_direction">row</h1>
    <div id="flex_container" class="flex-container"><div class="flex-item">1</div><div class="flex-item">2</div><div class="flex-item">3</div></div>
    
    <script>
        var container  = document.getElementById("flex_container");
        var direction_text = document.getElementById("current_direction");
        var baseClass = "flex-container ";
        var classPrefix = "flex-direction-";
        function change_direction( direction ){
            container.className = baseClass + classPrefix + direction;
            notify( direction );
        }
        
        function notify( direction ){
            direction_text.innerHTML = direction;
        }
        
        change_direction("row");
        change_direction("row-reverse");
        change_direction("column");
        change_direction("row-column-reverse");
        change_direction("row");
    </script>
</body>
</html>