Структура HTML5
<!doctype html>
<html lang="en">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- ADD CSS HERE -->
<title>Hello, world!</title>
</head>
<body>
<h1>Hello, world!</h1>
<!-- ADD JAVASCRIPT HERE-->
</body>
</html>
TELLI Hichem