Modal Dialog

The HTML page contains a button and modal dialog.

Using just Bootstrap's HTML attributes and no JavaScript, add attributes to the elements so that:

When the Open button is clicked, the modal dialog is opened.
When the Close button is clicked, the modal dialog is closed.

HTML5, CSS3, Bootstrap 4

Show starting code

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Modal Dialog</title>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.2.1/css/bootstrap.min.css">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.6/umd/popper.min.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js"></script>    
  </head>
  <body>
    <button type="button" class="btn btn-primary">Open</button>

    <div class="modal" id="dialog">
      <div class="modal-dialog">
        <div class="modal-body modal-content">
          <button type="button" class="btn btn-danger">Close</button>
        </div>
      </div>
    </div>
  </body>
</html>

Open button has correct attributes : Wrong answer
Close button has correct attributes: Wrong answer
Open button shows dialog: Wrong answer
Close button hides dialog: Wrong answer

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