HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>fieldset disabled</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}.card,fieldset{max-width:420px;margin:0 0 1rem;padding:1rem;background:#fff;border:1px solid #e2e8f0;border-radius:8px}fieldset:disabled{opacity:.65}legend{font-size:.875rem;font-weight:600;color:#475569;padding:0 .25rem}label{display:block;margin:.5rem 0 .25rem;font-size:.875rem;color:#475569}input{width:100%;box-sizing:border-box;font:inherit;padding:.45rem .6rem;border:1px solid #cbd5e1;border-radius:6px}p{font-size:.875rem;color:#64748b;max-width:480px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

</head>

<body>

  <h1>fieldset disabled disables all controls</h1>

  <fieldset disabled>

    <legend>Shipping (unavailable)</legend>

    <label for=city>City</label>

    <input id=city name=city value=Chennai>

    <label for=zip>ZIP</label>

    <input id=zip name=zip value=600001>

  </fieldset>



  <div class=card>

    <strong>disabled vs readonly</strong>

    <label for=ro>readonly — focusable, submitted</label>

    <input id=ro name=account value=ACC-1001 readonly>

    <label for=dis>disabled — not focusable, not submitted</label>

    <input id=dis name=legacy value="Old value" disabled>

  </div>



  <p><code>disabled</code> blocks interaction and excludes values from form submission. <code>readonly</code> prevents editing but still submits.</p>

</body>

</html>

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HTML disabled Attribute — fieldset and readonly