HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS a[rel~=noopener] Example</title>
  <style>
    a[rel~="noopener"] {
      color: #16a34a;
      font-weight: 600;
    }

    a {
      display: block;
      margin-bottom: 0.5rem;
      color: #2563eb;
      text-decoration: none;
    }
  </style>
</head>
<body>
  <h1>External Links</h1>
  <a href="https://example.com" target="_blank" rel="noopener noreferrer">Secure external link</a>
  <a href="/about">Internal about page</a>
</body>
</html>

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CSS [attribute~=value] - rel~=noopener