HTML Code

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

    em:only-of-type {
      color: #dc2626;
    }
  </style>
</head>
<body>
  <div>
    <p>Hello <em>world</em></p>
  </div>
  <div>
    <p><em>One</em> and <em>two</em></p>
  </div>
</body>
</html>

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CSS :only-of-type — nested em:only-of-type