HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>formaction — dynamic</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}button{font:inherit;padding:.45rem .85rem;border:1px solid #cbd5e1;border-radius:6px;background:#2563eb;color:#fff;cursor:pointer}.status{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 — dynamic JS</h1>
  <form action=/default method=post onsubmit=return!1>
    <button type=submit id=dynamicButton>Submit</button>
  </form>
  <p class=status id=status></p>

  <script>var btn=document.getElementById("dynamicButton");btn.formaction="/custom-handler",document.getElementById("status").textContent="Button formaction set to /custom-handler via button.formaction property."</script>
</body>
</html>

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HTML formaction Attribute — Dynamic formaction