css/css-flexbox/reference/flex-direction-modify.html

<!DOCTYPE html>
<html>
<head>
<title>CSS Test: flex flow direction</title>
<link rel="author" title="houzhenyu" href="http://www.github.com/sskyy" />
<style>
    .flex-container{
        display: flex;
        margin:20px;
        background: #333;
    }
    .flex-item{
        display: inline-block;
        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:row</h1>
    <div id="flex_container" class="flex-container flex-direction-row"><div class="flex-item">1</div><div class="flex-item">2</div><div class="flex-item">3</div></div>

</body>
</html>