HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>rel — noopener noreferrer</title>

  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 .75rem;font-size:1.25rem;color:#0f172a}a.btn{display:inline-block;padding:.5rem 1rem;background:#2563eb;color:#fff;border-radius:6px;text-decoration:none;font-weight:500;font-size:.875rem}ul{margin:.75rem 0 0;padding-left:1.25rem;font-size:.875rem}li{margin-bottom:.35rem}</style>

</head>

<body>

  <h1>target="_blank" done right</h1>



  <p>

    <a class=btn href=https://example.com target=_blank rel="noopener noreferrer">

      Visit partner site

    </a>

  </p>



  <ul>

    <li><strong>noopener</strong> — new tab cannot use <code>window.opener</code>.</li>

    <li><strong>noreferrer</strong> — no Referer header is sent.</li>

  </ul>

</body>

</html>

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HTML rel Attribute — noopener noreferrer