<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Hello World!</title>
</head>
<body>
<h1>Hello World!</h1>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
  <head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Hello World!</title>
</head>
<body>
<h1>Hello World!</h1>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Hello World!</title>
</head>
  <body>
    <h1>Hello World!</h1>
</body>
</html>