g-mode: vertical-rl;
    }
  </style>
</head>
<body>
  <div class="flex rowDir"><div class="child"></div></div>
  <div class="flex colDir"><div class="child"></div></div>
  <div class="flex rowDir vertRL"><div class="child"></div></div>
  <div class="flex colDir vertRL"><div class="child"></div></div>
</body>
</html>
