Let's write our first JavaScript program. Here it is:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>My first program</title>
<script>
alert('Hello, world!');
</script>
</head>
<body>
my first program
</body>
</html>
Copy the above code and insert it in an HTML file. Open this file in a browser and you will see a dialog box with text.
Make a file with your first program. Output some text to the screen with it.