HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>:first-of-type vs :first-child</title>
  <style>
    .of-type p:first-of-type {
      color: #dc2626;
      font-weight: 700;
    }

    .of-child p:first-child {
      color: #16a34a;
      font-weight: 700;
    }
  </style>
</head>
<body>
  <div class="of-type">
    <h2>Using :first-of-type</h2>
    <p>This p matches (first p).</p>
    <p>This p does not.</p>
  </div>

  <div class="of-child">
    <h2>Using :first-child</h2>
    <p>This p does not match (h2 is first).</p>
    <p>This p does not either.</p>
  </div>
</body>
</html>

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