<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>First Javascript Code</title>
<script>
alert('Hello World!');
</script>
</head>
<body>
<h1> Hello World </h1>
</body>
</html>