Tryit Editor v2.9

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

<h2 onclick="showCoords(event)">Click this heading to get the x (horizontal) and y (vertical) coordinates of the mouse pointer, relative to the screen, 
when it is clicked.</h2>

<p><strong>Tip:</strong> Try to click different places in the heading.</p>

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

<script>
function showCoords(event) {
    var x = event.screenX;
    var y = event.screenY;
    var coords = "X coords: " + x + ", Y coords: " + y
    document.getElementById("demo").innerHTML = coords;
}
</script>

</body>
</html>