HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS min-block-size 50%</title>
  <style>
    body { font-family: sans-serif; padding: 1.5rem; background: #f8fafc; }
    .parent { block-size: 240px; background: #f1f5f9; padding: 0.5rem; border-radius: 0.5rem; }
    .child { min-block-size: 50%; background: #93c5fd; padding: 0.75rem; border-radius: 0.35rem; }
  </style>
</head>
<body>
  <h1>50% Minimum</h1>
  <div class="parent"><div class="child">At least half the parent block size.</div></div>
</body>
</html>

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CSS min-block-size Property - 50% Minimum