HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>formenctype — mixed encoding</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}input[type=file],input[type=submit],input[type=text]{font:inherit;display:block;width:100%;box-sizing:border-box;margin-bottom:.65rem}input[type=file],input[type=text]{padding:.45rem .6rem;border:1px solid #cbd5e1;border-radius:6px}input[type=submit]{width:auto;padding:.45rem .85rem;border:1px solid #cbd5e1;border-radius:6px;background:#2563eb;color:#fff;cursor:pointer;margin-right:.5rem}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:420px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>
</head>
<body>
  <h1>formenctype — mixed encoding</h1>
  <form action=/handler method=post enctype=multipart/form-data onsubmit=return!1>
    <input name=title placeholder=Title>
    <input type=file name=attachment>
    <input type=submit value="Upload with file">
    <input type=submit value="Save text only" formenctype=application/x-www-form-urlencoded>
  </form>
  <p class=hint>Form defaults to <code>multipart/form-data</code>, but &ldquo;Save text only&rdquo; overrides to URL-encoded encoding.</p>
</body>
</html>

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HTML formenctype Attribute — Mixed Encoding