HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>formaction 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}input[type=submit],input[type=text]{font:inherit}input[type=text]{width:100%;box-sizing:border-box;padding:.45rem .6rem;border:1px solid #cbd5e1;border-radius:6px;margin-bottom:.75rem}input[type=submit]{margin-right:.5rem;margin-top:.25rem;padding:.45rem .75rem;border:1px solid #cbd5e1;border-radius:6px;background:#2563eb;color:#fff;cursor:pointer}.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>formaction — dual submit</h1>
  <form action=/default-handler method=post onsubmit=return!1>
    <input name=username placeholder="Enter your username">
    <input type=submit value="Submit to Default Handler">
    <input type=submit value="Submit to Custom Handler" formaction=/custom-handler>
  </form>
  <p class=hint>First button uses <code>/default-handler</code>; second overrides with <code>formaction="/custom-handler"</code>.</p>
</body>
</html>

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HTML formaction Attribute — Dual Submit Buttons