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<html lang="en"> <head> <title>Bootstrap Example</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css"> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script> </head> <body > <div style="margin:30px"> <div class="container"> <div class="panel-group"> <div class="panel panel-default"> <div class="panel-heading"> <h4 class="panel-title"> <a data-toggle="collapse" href="#collapse1">Thanh Panel đóng/mở</a> </h4> </div> <div id="collapse1" class="panel-collapse collapse"> <div class="panel-body">Nội dung Panel</div> <div class="panel-footer">Phần Footer của Panel</div> </div> </div> </div> </div> </div> </body> </html>
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