Tryit Editor v2.9

Edit This Code:
<!DOCTYPE html>
<html>
<head>
<script>
function coordinates(event) {
    document.getElementById("demo").innerHTML =
    "X = " + event.screenX + "<br>Y = " + event.screenY;
}
</script>
</head>
<body>

<p onmousedown="coordinates(event)">
Click this paragraph, to display the x and y coordinates of the cursor, relative to the screen.
</p>

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

</body>
</html>