HTML Code

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

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

    .parent {
      block-size: 220px;
      padding: 8px;
      border: 1px dashed #64748b;
      background: #f8fafc;
    }

    .child {
      min-block-size: 50%;
      background: #93c5fd;
      border: 1px solid #2563eb;
      padding: 12px;
    }
  </style>
</head>
<body>
  <p>The parent is <strong>220px</strong> tall. The child uses <strong>min-block-size: 50%</strong>, so its floor is 110px on the block axis.</p>
  <div class="parent">
    <div class="child">At least half</div>
  </div>
</body>
</html>

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CSS min-block-size Property — percentage