Итак, я изучал интерфейсный курс, который был создан в 2018 году, и этот парень Брэд Хасси преподавал Bootstrap, и когда я загрузил исходный код и все, что нужно для работы веб-сайта, система сеток, например, не работала.
<!DOCTYPE html>
<html lang = "en">
<head>
<meta charset = "utf-8">
<meta http-equiv = "X-UA-Compatible" content = "IE=edge">
<meta name = "viewport" content = "width=device-width, initial-scale=1">
<title>Bootstrap Forms</title>
<!-- Bootstrap -->
<link href = "bootstrap/css/bootstrap.min.css" rel = "stylesheet">
<link href = "styles.css" rel = "stylesheet">
<!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
<!--[if lt IE 9]>
<script src = "https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
<script src = "https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
<![endif]-->
</head>
<body>
<div class = "container">
<div class = "page-header">
<h1>Bootstrap Forms</h1>
<p class = "lead">Let's work with some sexy, pre-styled forms, shall we?</p>
</div><!-- page-header -->
<div class = "row">
<div class = "col-sm-4">
</div>
<!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
<script src = "https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<!-- Include all compiled plugins (below), or include individual files as needed -->
<script src = "bootstrap/js/bootstrap.min.js"></script>
</body>
</html>
моя версия начальной загрузки - 3.3.5
Вам не хватает закрывающих тегов div. В остальном, похоже, все работает нормально.
<!DOCTYPE html>
<html lang = "en">
<head>
<meta charset = "utf-8">
<meta http-equiv = "X-UA-Compatible" content = "IE=edge">
<meta name = "viewport" content = "width=device-width, initial-scale=1">
<title>Bootstrap Forms</title>
<!-- Bootstrap -->
<link href = "bootstrap/css/bootstrap.min.css" rel = "stylesheet">
<link href = "styles.css" rel = "stylesheet">
<!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
<!--[if lt IE 9]>
<script src = "https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
<script src = "https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
<![endif]-->
</head>
<body>
<div class = "container"> <!--- you never closed --->
<div class = "page-header">
<h1>Bootstrap Forms</h1>
<p class = "lead">Let's work with some sexy, pre-styled forms, shall we?</p>
</div><!-- page-header -->
<div class = "row"> <!--- you never closed --->
<div class = "col-sm-4">
</div>
</div> <!--- add </div> here --->
</div> <!--- add div here --->
<!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
<script src = "https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<!-- Include all compiled plugins (below), or include individual files as needed -->
<script src = "bootstrap/js/bootstrap.min.js"></script>
</body>
</html>
хорошо, большое спасибо!
какая у вас версия начальной загрузки?