HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>:read-only vs :disabled</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
    }

    input {
      display: block;
      margin: 0.5rem 0 1rem;
      padding: 0.4rem 0.6rem;
    }

    input:read-only {
      background: #e2e8f0;
    }

    input:disabled {
      background: #f8fafc;
      color: #94a3b8;
    }
  </style>
</head>
<body>
  <label>
    Read-only (submits)
    <input type="text" value="Kept on submit" readonly>
  </label>
  <label>
    Disabled (skipped)
    <input type="text" value="Not submitted" disabled>
  </label>
</body>
</html>

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CSS :read-only vs :disabled