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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/3.4.1/css/bootstrap.min.css"> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.1/jquery.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script></head><body><div class="container"> <h2>Collapse-down Glyph</h2> <p>Collapse-down icon: <span class="glyphicon glyphicon-collapse-down"></span></p> <p>Collapse-down icon as a link: <a href="#"> <span class="glyphicon glyphicon-collapse-down"></span> </a> </p> <p>Collapse-down icon on a button: <button type="button" class="btn btn-default btn-sm"> <span class="glyphicon glyphicon-collapse-down"></span> Collapse </button> </p> <p>Collapse-down icon on a styled link button: <a href="#" class="btn btn-info btn-lg"> <span class="glyphicon glyphicon-collapse-down"></span> Collapse