HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>https blank links</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    a { display: block; margin: 8px 0; }
    .ext { color: #2563eb; font-weight: bold; }
  </style>
</head>
<body>
  <a href="https://example.com" target="_blank">External HTTPS</a>
  <a href="https://docs.example.com">HTTPS same tab</a>
  <a href="http://legacy.example.com" target="_blank">HTTP external</a>
  <a href="/about">Internal link</a>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $('a[href^="https"][target="_blank"]').addClass("ext");
  </script>
</body>
</html>

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a[href^="https"][target="_blank"] (Try It)