HTML Code

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

    /* Try commenting one rule and enabling the other */
    p:only-child {
      background: #fce7f3;
    }

    /*
    p:only-of-type {
      background: #dbeafe;
    }
    */
  </style>
</head>
<body>
  <div>
    <p>Only child (and only p)</p>
  </div>
  <div>
    <p>Only p, but has a span sibling</p>
    <span>Extra</span>
  </div>
</body>
</html>

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CSS :only-child vs :only-of-type