HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>hidden 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}.visible{padding:.75rem 1rem;background:#ecfdf5;border:1px solid #6ee7b7;border-radius:8px;margin-bottom:.75rem}.hidden-box{padding:.75rem 1rem;background:#fef3c7;border:1px solid #fcd34d;border-radius:8px}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:420px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>
</head>
<body>
  <h1>hidden — basic usage</h1>
  <p class=visible>This paragraph is visible.</p>
  <div class=hidden-box hidden>
    <p style=margin:0>This block is hidden by default because of the <code>hidden</code> attribute.</p>
  </div>
  <p class=hint>The second block is in the DOM but not displayed. Remove <code>hidden</code> to show it.</p>
</body>
</html>

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HTML hidden Attribute — Hide Content by Default