<html>
<head>
<style>
.block { width:100px; height:100px; margin:2em 1em; background-color:green }
</style>
<body>
<div style="border:2px solid black">
<div style="-webkit-writing-mode:vertical-lr" class="block"></div>
<div style="-webkit-writing-mode:vertical-rl" class="block"></div>
<div style="-webkit-writing-mode:horizontal-bt" class="block"></div>
<div class="block"></div>
</div>
</body>
</html>
