HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>min-block-size with writing-mode</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
    }

    p {
      margin: 0 0 12px;
      max-width: 40rem;
      line-height: 1.5;
    }

    div {
      writing-mode: vertical-rl;
      min-block-size: 150px;
      background: #93c5fd;
      border: 1px solid #2563eb;
      padding: 12px;
    }
  </style>
</head>
<body>
  <p>With <strong>writing-mode: vertical-rl</strong>, <strong>min-block-size: 150px</strong> sets a minimum physical width, not height.</p>
  <div>Hi</div>
</body>
</html>

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CSS min-block-size Property — writing-mode