var x, y, z; // Declare Variables
x = 5; y = 6; // Assign Values
z = x + y; // Compute Values
var x;
x = 6;<!DOCTYPE html>
<html>
<head>
<title></title>
<script> alert("JavaScript Syntax")</script>
</head>
<body>
<h1>Syntax Tutorial Internel JavaScript</h1>
</body>
</html>