1<!DOCTYPE html>
2<html>
3<head>
4    <script type="text/javascript">
5        function log(s)
6        {
7            var output = document.getElementById('output');
8            output.innerHTML += s + "<br>";
9        }
10        
11        function doTest()
12        {
13            window.setInterval(function() {
14                
15                var screen = window.screen;
16                log('screen availLeft: ' + screen.availLeft + ' availTop: ' + screen.availTop);
17                
18            }, 1000);
19        }
20        window.addEventListener('load', doTest, false);
21    </script>
22</head>
23<body>
24    <p>On a two-monitor system, configure the menu bar to be on the right screen. Then drag this window between screens. When on the left screen, screen.availLeft should be negative.</p>
25    <div id="output"></div>
26</body>
27</html>
28