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<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="UTF-8">

  <meta name="viewport" content="width=device-width, initial-scale=1.0">

  <title>CSS inline-size Vertical Example</title>

  <style>

    body {

      font-family: system-ui, sans-serif;

      padding: 1.5rem;

      line-height: 1.6;

    }



    .vertical-box {

      writing-mode: vertical-rl;

      inline-size: 120px;

      background-color: #ede9fe;

      border: 1px solid #7c3aed;

      padding: 1rem;

      border-radius: 0.35rem;

      font-weight: 600;

    }

  </style>

</head>

<body>

  <h1>Vertical Writing Mode</h1>

  <p>With writing-mode: vertical-rl, inline-size controls the vertical dimension.</p>

  <div class="vertical-box">Text flows vertically along the inline axis.</div>

</body>

</html>

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CSS inline-size Property - vertical writing mode