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<!doctype html> <html lang="en"> <head> <title>Bootstrap Make Input Field Required</title> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" crossorigin="anonymous"> <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" crossorigin="anonymous"></script> </head> <body> <div class="container"> <h2>Bootstrap Make Input Field Required</h2> <form method="post"> <div class="form-group"> <input type="text" class="form-control" name="username" placeholder="Username" required="true"> </div> <button type="submit" class="btn btn-primary">Login</button> </form> </div> </body> </html>
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