HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>method — POST form</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}button{margin-top:1rem;padding:.5rem 1rem;font:inherit;cursor:pointer;border-radius:6px;border:1px solid #1d4ed8;background:#2563eb;color:#fff}.result{margin-top:1rem;padding:.75rem 1rem;background:#eff6ff;border:1px solid #bfdbfe;border-radius:8px;font-size:.8125rem;max-width:420px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

</head>

<body>

  <h1>method="post" on &lt;form&gt;</h1>

  <form id=signup action=/submit-form method=post>

    <label for=name>Name:</label>

    <input id=name name=name required>



    <label for=email>Email:</label>

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



    <button type=submit>Submit (POST)</button>

  </form>

  <div class=result id=result>Submit the form to see how POST sends data in the request body (demo only — no server call).</div>



  <script>document.getElementById("signup").addEventListener("submit",(function(n){n.preventDefault();var t=new FormData(this),e=[];t.forEach((function(n,t){e.push(t+"="+encodeURIComponent(n))})),document.getElementById("result").innerHTML="<strong>Method:</strong> POST<br><strong>Action:</strong> "+this.action+"<br><strong>Body (application/x-www-form-urlencoded):</strong><br><code>"+e.join("&amp;")+"</code>"}))</script>

</body>

</html>

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HTML method Attribute — POST Form Submission