hello.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Hello</title>
    <script>
        function greet() {
            //One-line comment
            /*Multiline*/
            //Defining variables
            let x = 5;
            let counter = 0;
            counter += 1;

            //Conditions
            if (x < y) {
                alert("x<y")
            } else if (x > y) {
                alert("x<y")
            } else {
                alert("x>y")
            }

            //Loops
            while (true)
            {
            }

            for (let i=0; i<10; i++)
            {
            }

            alert("Hello, world!");
        }
    </script>
</head>
<body>
<form onsubmit="greet(); return false;">
    <input type="text">
    <input type="submit">
</form>
</body>
</html>