HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>first-child vs first-of-type</title>
  <style>
    p:first-child {
      color: #16a34a;
      font-weight: 700;
    }

    p:first-of-type {
      text-decoration: underline;
    }
  </style>
</head>
<body>
  <div>
    <p>This text is selected!</p>
    <p>This text isn't selected.</p>
  </div>

  <div>
    <h2>Not a p</h2>
    <p>first-child fails; first-of-type can match</p>
  </div>
</body>
</html>

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CSS :first-child vs :first-of-type