- var e = document.documentElement, b = document.body;
- event.pageX = event.clientX + (e.scrollLeft || b.scrollLeft);
- event.pageY = event.clientY + (e.scrollTop || b.scrollTop);
+ var e = document.documentElement || document.body;
+ event.pageX = event.clientX + e.scrollLeft;
+ event.pageY = event.clientY + e.scrollTop;