HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>selected — car form</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}label{display:block;margin-bottom:.35rem;font-weight:500;font-size:.875rem}input[type=submit],select{padding:.5rem .75rem;font:inherit;border-radius:6px;border:1px solid #cbd5e1}select{min-width:220px;margin-bottom:.75rem}input[type=submit]{background:#0f172a;color:#fff;border-color:#0f172a;cursor:pointer}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:420px}</style>

</head>

<body>

  <h1>Default car selection</h1>

  <form action=# onsubmit='return alert("Submitted: "+document.getElementById("car").value),!1'>

    <label for=car>Select your car:</label>

    <select id=car name=car>

      <option value=volvo>Volvo</option>

      <option value=saab>Saab</option>

      <option value=mercedes selected>Mercedes</option>

      <option value=audi>Audi</option>

    </select>

    <div><input type=submit value=Submit></div>

  </form>

  <p class=hint>Mercedes loads selected. Submit sends <code>car=mercedes</code> unless you change it.</p>

</body>

</html>

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HTML selected Attribute — Car Form Dropdown