HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>CSS content external link</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 1.5rem;
      line-height: 1.6;
    }

    a[target="_blank"]::after {
      content: " ↗";
      font-size: 0.85em;
      color: #64748b;
    }
  </style>
</head>
<body>
  <h1>External link indicator</h1>
  <p>
    Visit
    <a href="https://developer.mozilla.org" target="_blank" rel="noopener noreferrer">MDN Web Docs</a>
    to learn more about CSS.
  </p>
</body>
</html>

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CSS content Property - External Link Arrow