HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>Multiple accept-charset values</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:0 0 .35rem;font-size:.875rem;font-weight:500;color:#475569}textarea{width:100%;box-sizing:border-box;min-height:5rem;padding:.55rem .65rem;border:1px solid #cbd5e1;border-radius:6px;font:inherit;resize:vertical}input[type=submit]{margin-top:.75rem;font:inherit;cursor:pointer}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:420px}</style>
</head>
<body>
  <h1>Multiple encodings</h1>
  <form action=/submit-form method=post accept-charset="UTF-8 ISO-8859-1">
    <label for=message>Message (try accented characters):</label>
    <textarea id=message name=message placeholder="Café, naïve, 日本語"></textarea>
    <input type=submit value=Submit>

Space-separated list tells the server which encodings the form may use. Prefer UTF-8 for modern sites.

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HTML accept-charset — Multiple Encodings