<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>JavaScript Logical Operators</title>
</head>
<body>
<script>
var year = 2020;
// Leap years are divisible by 400 or by 4 but not 100
if((year % 400 == 0) || ((year % 100 != 0) && (year % 4 == 0))){
document.write(year + " is a leap year.");
} else{
document.write(year + " is not a leap year.");
}
</script>
</body>
</html>