Tryit Editor v2.7

Edit This Code:
<!DOCTYPE html>
<html>
<body>

<p id="demo"></p>

<script>
  var x = 5;      // Declare x, give it the value of 5
  var y = x + 2;  // Declare y, give it the value of x + 2 

  document.getElementById("demo").innerHTML = y; // Write y to demo
</script>

<p><strong>Note:</strong> The comments are not executed.</p>

</body>
</html>