HTML Code

<!DOCTYPE html>

<html>

<head>

  <title>CSS :read-only Basic Example</title>

  <style>

    body {

      font-family: system-ui, sans-serif;

      padding: 1.5rem;

    }



    label {

      display: block;

      font-weight: 600;

      font-size: 0.875rem;

      margin-bottom: 0.25rem;

      color: #334155;

    }



    input {

      display: block;

      width: 100%;

      max-width: 18rem;

      padding: 0.5rem 0.75rem;

      margin-bottom: 1rem;

      border-radius: 0.4rem;

      font-size: 0.875rem;

      box-sizing: border-box;

    }



    :read-only {

      background: #f1f5f9;

      border: 1px solid #cbd5e1;

      color: #64748b;

    }



    :read-write {

      background: #fff;

      border: 2px solid #cbd5e1;

      color: #1e293b;

    }

  </style>

</head>

<body>

  <form>

    <label for="ro">Read-only field</label>

    <input type="text" id="ro" value="This is read-only" readonly>



    <label for="rw">Editable field</label>

    <input type="text" id="rw" placeholder="You can edit this">

  </form>

</body>

</html>

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CSS :read-only Selector - Basic Read/Write Pair