HTML Code

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

    div:only-child {
      color: #dc2626;
    }
  </style>
</head>
<body>
  <div>
    <div>I am an only child.</div>
  </div>
  <div>
    <div>Sibling A</div>
    <div>Sibling B
      <div>Nested only child</div>
    </div>
  </div>
</body>
</html>

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CSS :only-child — nested div:only-child