HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>formtarget — 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,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}button{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>formtarget — dynamic JS</h1>
  <form action=/search onsubmit=return!1>
    <input name=q placeholder=Search...>
    <button type=submit id=submitBtn>Submit</button>
  </form>
  <p class=status id=status></p>

  <script>
    document.getElementById("submitBtn").formTarget = "_top";
    document.getElementById("status").textContent =
      "formTarget = "_top" on submit button (not on the form element).";
  </script>
</body>
</html>

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HTML formtarget Attribute — Dynamic formTarget