<!DOCTYPE html>
<html>
<body>

<p>Click the button to display the avail width of your screen, in pixels.</p>

<button onclick="myFunction()">Try it</button>

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

<script>
function myFunction() {
  var x = "Avail Width: " + screen.availWidth + "px";
  window.alert(x);
}
</script>

</body>
</html>
