HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>dialog open Attribute</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}dialog{border:1px solid #e2e8f0;border-radius:10px;padding:1.25rem;max-width:320px;box-shadow:0 10px 30px rgba(15,23,42,.12)}dialog p{margin:0 0 1rem}button{padding:.45rem .9rem;border:none;border-radius:6px;background:#2563eb;color:#fff;cursor:pointer;font:inherit}</style>
</head>
<body>
  <h1>open on dialog</h1>
  <dialog open>
    <p>This dialog is visible because of the <code>open</code> attribute.</p>
    <form method=dialog>
      <button>Close</button>
    </form>
  </dialog>
</body>
</html>

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HTML dialog Tag — open Attribute