HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>CSS text-orientation Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 20px;
      background: #f8fafc;
    }

    .vertical-text {
      writing-mode: vertical-rl;
      text-orientation: upright;
      border: 1px solid #000;
      padding: 10px;
      width: 100px;
      height: 200px;
    }
  </style>
</head>
<body>
  <h1>Text Orientation Example</h1>
  <div class="vertical-text">
    これは縦書きのテキストです。
  </div>
</body>
</html>

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CSS text-orientation Property - Upright Vertical Text