HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS ::after External Link</title>
  <style>
    a.external::after {
      content: " ↗";
      font-size: 0.85em;
      color: #2563eb;
    }

    a.external {
      color: #1d4ed8;
      text-decoration: none;
      font-weight: 600;
    }

    a.external:hover {
      text-decoration: underline;
    }
  </style>
</head>
<body>
  <h1>Resources</h1>
  <p>
    Read the docs on
    <a class="external" href="https://developer.mozilla.org" target="_blank" rel="noopener">MDN Web Docs</a>.
  </p>
</body>
</html>

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CSS ::after Selector - External Link Icon