HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>autocapitalize Form 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:.65rem 0 .25rem;font-size:.875rem;font-weight:500;color:#475569}label:first-of-type{margin-top:0}input,textarea{width:100%;box-sizing:border-box;padding:.45rem .6rem;border:1px solid #cbd5e1;border-radius:6px;font:inherit}textarea{min-height:80px;resize:vertical}input[type=submit]{width:auto;margin-top:.75rem;cursor:pointer}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:420px}</style>
</head>
<body>
  <h1>autocapitalize form</h1>
  <form action=# onsubmit=return!1>
    <label for=name>Name:</label>
    <input id=name name=name autocapitalize=words placeholder="Jane Doe">
    <label for=bio>Bio:</label>
    <textarea id=bio name=bio autocapitalize=sentences placeholder="Tell us about yourself..."></textarea>
    <label for=code>Access Code:</label>
    <input id=code name=code autocapitalize=characters placeholder=ABC123>
    <input type=submit value=Submit>

Best tested on mobile — iOS and Android virtual keyboards honor autocapitalize.

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HTML autocapitalize Attribute — Form Example