HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>data-* User Example</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 1rem;font-size:1.25rem;color:#0f172a}.profile{max-width:420px;padding:1rem 1.1rem;background:#fff;border:1px solid #e2e8f0;border-radius:8px}ul{margin:.5rem 0 0;padding-left:1.25rem}p{margin-top:1rem;font-size:.875rem;color:#64748b;max-width:420px}</style>

</head>

<body>

  <h1>User profile data attributes</h1>

  <div id=user class=profile data-user-id=123 data-username=john_doe data-email=john@example.com>

    <strong>User Profile Information</strong>

    <ul>

      <li>User ID: 123</li>

      <li>Username: john_doe</li>

      <li>Email: john@example.com</li>

    </ul>

  </div>

  <p>These values live in <code>data-*</code> attributes and can be read with JavaScript without showing them as visible text if you prefer.</p>

</body>

</html>

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HTML data-* Attribute — User Profile Data