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<!DOCTYPE html> <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/4.0.0-beta.2/css/bootstrap.min.css"> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.6/umd/popper.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js"></script> </head> <body> <div class="container"> <h2>Alerts</h2> <p>The button with class="close" and data-dismiss="alert" is used to close the alert box.</p> <p>The alert-dismissible class adds some extra padding to the close button.</p> <div class="alert alert-success alert-dismissable"> <button type="button" class="close" data-dismiss="alert">×</button> <strong>Success!</strong> This alert box could indicate a successful or positive action. </div> <div class="alert alert-info alert-dismissable"> <button type="button" class="close" data-dismiss="alert">×</button> <strong>Info!</strong> This alert box could indicate a neutral informative change or action. </div> <div class="alert alert-warning alert-dismissable"> <button type="button" class="close" data-dismiss="alert">×</button> <strong>Warning!</strong> This alert box could indicate a warning that might need attention. </div> <div class="alert alert-danger alert-dismissable"> <button type="button" class="close" data-dismiss="alert">×</button> <strong>Danger!</strong> This alert box could indicate a dangerous or potentially negative action. </div> <div class="alert alert-primary alert-dismissable"> <button type="button" class="close" data-dismiss="alert">×</button> <strong>Primary!</strong> Indicates an important action. </div> <div class="alert alert-secondary alert-dismissable"> <button type="button" class="close" data-dismiss="alert">×</button> <strong>Secondary!</strong> Indicates a slightly less important action. </div> <div class="alert alert-dark alert-dismissable"> <button type="button" class="close" data-dismiss="alert">×</button> <strong>Dark!</strong> Dark grey alert. </div> <div class="alert alert-light alert-dismissable"> <button type="button" class="close" data-dismiss="alert">×</button> <strong>Light!</strong> Light grey alert. </div> </div> </body> </html>