HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>Dynamic Focus 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}form{max-width:420px;padding:1.25rem;background:#fff;border:1px solid #e2e8f0;border-radius:8px}label{display:block;margin-bottom:.35rem;font-size:.875rem;font-weight:500;color:#475569}button,input{width:100%;box-sizing:border-box;padding:.45rem .6rem;border:1px solid #cbd5e1;border-radius:6px;font:inherit}button{margin-top:.75rem;cursor:pointer;background:#fff}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:420px}</style>

</head>

<body>

  <h1>Dynamic focus with JavaScript</h1>

  <form action=# onsubmit=return!1>

    <label for=dynamicField>Enter your name:</label>

    <input id=dynamicField name=name>

    <button type=submit>Submit</button>

  </form>

  <p class=hint>JavaScript calls <code>element.focus()</code> to move the cursor into the field after load.</p>

  <script>document.getElementById("dynamicField").focus()</script>

</body>

</html>

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HTML autofocus Attribute — Dynamic JavaScript