HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>Dynamic action 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[type=email],input[type=text]{width:100%;box-sizing:border-box;padding:.45rem .6rem;border:1px solid #cbd5e1;border-radius:6px;font:inherit}button[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>Dynamic action</h1>
  <form id=dynamicForm method=post>
    <label for=name>Name:</label>
    <input id=name name=name>
    <label for=email>Email:</label>
    <input type=email id=email name=email>
    <button type=submit>Submit</button>
  </form>
  <p class=hint>JavaScript sets <code>action</code> to <code>/submit-form</code> when the page loads.</p>
  <script>document.getElementById("dynamicForm").action="/submit-form"</script>
</body>
</html>

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HTML action Attribute — Dynamic JavaScript