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<!DOCTYPE html> <html> <head> <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/3.7.1/jquery.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script> </head> <body> <div class="container"> <h1>h1 Bootstrap heading <small>(36px)</small></h1> <h2>h2 Bootstrap heading <small>(30px)</small></h2> <h3>h3 Bootstrap heading <small>(24px)</small></h3> <h4>h4 Bootstrap heading <small>(18px)</small></h4> <h5>h5 Bootstrap heading <small>(14px)</small></h5> <h6>h6 Bootstrap heading <small>(12px)</small></h6> </div> </body> </html>
