HTML Code
<!DOCTYPE html>



<html lang=en>



<head>



  <meta charset=UTF-8>



  <meta name=viewport content="width=device-width,initial-scale=1">



  <title>novalidate — dynamic toggle</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 .75rem;font-size:1.25rem;color:#0f172a}label{display:block;margin:.75rem 0 .35rem;font-weight:500;font-size:.875rem}input{width:100%;max-width:320px;padding:.5rem .65rem;font:inherit;border:1px solid #cbd5e1;border-radius:6px}.controls{margin-top:1rem;display:flex;gap:.5rem;flex-wrap:wrap}button{padding:.5rem 1rem;font:inherit;cursor:pointer;border-radius:6px;border:1px solid #cbd5e1;background:#fff}button.primary{background:#2563eb;color:#fff;border-color:#1d4ed8}.status{margin-top:.75rem;font-size:.8125rem;color:#64748b;max-width:420px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>



</head>



<body>



  <h1>Toggle form.novalidate</h1>



  <form id=dynamicForm>



    <label for=email>Email (required):</label>



    <input type=email id=email name=email required>







    <div class=controls>



      <button type=button id=disableBtn>Set novalidate = true</button>



      <button type=button id=enableBtn>Set novalidate = false</button>



      <button type=submit class=primary>Try submit</button>



    </div>



  </form>



  <p class=status id=status>Validation: <strong>enabled</strong> (form.novalidate = false). Empty submit should be blocked.</p>







  <script>var form=document.getElementById("dynamicForm"),status=document.getElementById("status");document.getElementById("disableBtn").addEventListener("click",(function(){form.novalidate=!0,status.innerHTML="Validation: <strong>disabled</strong> (<code>form.novalidate = true</code>). Empty submit allowed."})),document.getElementById("enableBtn").addEventListener("click",(function(){form.novalidate=!1,status.innerHTML="Validation: <strong>enabled</strong> (<code>form.novalidate = false</code>). Empty submit blocked."})),form.addEventListener("submit",(function(e){e.preventDefault(),status.innerHTML+="<br>Submit event fired (preventDefault for demo)."}))</script>



</body>



</html>
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HTML novalidate Attribute — Toggle with form.novalidate
