<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>CSS Logical Properties Cascading Reference</title>
  <link rel="author" title="Manish Goregaokar" href="mailto:manishearth@gmail.com">
  <style>
    div {
      writing-mode: horizontal-tb;
      direction: ltr;
      background-color: blue;
    }
    .horizontal {
      width: 100px;
      height: 10px;
    }
    #horizontal {
      width: 100px;
      height: 10px;
    }
    .vertical {
      width: 10px;
      height: 100px;
    }
    #vertical {
      width: 10px;
      height: 100px;
    }
  </style>
</head>
<body>
  <p>Test passes if there are two vertical blue boxes followed by two horizontal blue boxes.</p>

<div class="horizontal" id="vertical"></div><br>
<div class="horizontal" id="vertical"></div><br>
<div class="vertical" id="horizontal"></div><br>
<div class="vertical" id="horizontal"></div><br>
</body>
</html>