<!DOCTYPE html>
<html>
<head>
<title>JavaScript Programming.</title>
</head>
<body>
<h1 >JavaScript Program to print Hello World!</h1>
<h2 id="demo"></h2>
<script>
document.getElementById("demo").innerHTML = "Hello JavaScript";
</script>
</body>
</html>
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<!DOCTYPE html>
<html>
<head>
<title>JavaScript Programming.</title>
</head>
<body>
<h1 >JavaScript Program to Add Two Numbers !</h1>
<h2 id="demo"></h2>
<script>
let a, b, sum;
a = 10;
b = 20;
sum = a + b;
document.getElementById("demo").innerHTML = 'Sum of ' + a + ' and ' + b + ' is ' + sum ;
</script>
</body>
</html>
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<!DOCTYPE html>
<html>
<head>
<title>JavaScript Programming.</title>
</head>
<body>
<h1 >JavaScript Program to Check Odd or Even !</h1>
<h2 id="demo"></h2>
<script>
let num;
num = 14;
x = num % 2 == 0 ? "Even Number" : "Odd Number";
document.getElementById("demo").innerHTML = x;
</script>
</body>
</html>
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