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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://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/css/bootstrap.min.css"> <script src="https://cdn.jsdelivr.net/npm/jquery@3.7.1/dist/jquery.slim.min.js"></script> <script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.1/dist/umd/popper.min.js"></script> <script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/js/bootstrap.bundle.min.js"></script></head><body><div class="container"> <h2>Form Validation</h2> <p>In this example we use <code>.was-validated</code> to indicate what's missing before submitting the form:</p> <form action="/action_page.php"> <div class="form-group"> <label for="uname">Username:</label> <input type="text" class="form-control is-valid" id="uname" placeholder="Enter username" name="uname" required value="JohnDoe"> <div class="valid-feedback">Valid username.</div> </div> <div class="form-group"> <label for="pwd">Password:</label> <input type="password" class="form-control is-invalid" id="pwd" placeholder="Enter password" name="pswd" required> <div class="invalid-feedback">Please fill out this field.</div> </div> <div class="form-group form-check">