<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
<link rel="stylesheet"https://cdnjs.cloudflare.com/ajax/libs/bootstrap-validator/0.5.3/css/bootstrapValidator.css"/>
<title>Hello, world!</title>
</head>
<body>
<h1>Nice bootstrap 4 submit form <a href="webublogoverflow.blogspot.com">webublogoverflow</a></h1>
<div class="container">
<form>
<div class="form-row">
<div class="col-md-4 mb-3">
<label for="validationServer013">First name</label>
<input type="text" class="form-control is-valid" id="validationServer013" placeholder="First name"
value="Mark" required>
<div class="valid-feedback">
Looks good!
</div>
</div>
<div class="col-md-4 mb-3">
<label for="validationServer023">Last name</label>
<input type="text" class="form-control is-valid" id="validationServer023" placeholder="Last name"
value="Otto" required>
<div class="valid-feedback">
Looks good!
