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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 href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet"> <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js"></script></head><body><div class="container mt-3"> <h3>Form Validation</h3> <p>Try to submit the form.</p> <form action="/action_page.php" class="was-validated"> <div class="mb-3 mt-3"> <label for="uname" class="form-label">Username:</label> <input type="text" class="form-control" id="uname" placeholder="Enter username" name="uname" required> <div class="valid-feedback">Valid.</div> <div class="invalid-feedback">Please fill out this field.</div> </div> <div class="mb-3"> <label for="pwd" class="form-label">Password:</label> <input type="password" class="form-control" id="pwd" placeholder="Enter password" name="pswd" required> <div class="valid-feedback">Valid.</div> <div class="invalid-feedback">Please fill out this field.</div> </div>