IE: event.pageX and event.pageY not using scroll if element belongs to a different document

[bgrins]

I ran into an issue in IE where the pageX and pageY were not being computed properly (that is, not consistent with native pageX/pageY calculations from other browsers).

Test Case: ​http://jsfiddle.net/nfyVy/

Inside event.js, this small change seems to fix it:

if (event.pageX == null && event.clientX != null) {
   var ownerDoc = event.target.ownerDocument || document;
   var doc = ownerDoc.documentElement, body = ownerDoc.body;

EXCEPT: When there is a frameborder on the frame, the ownerDocument has a clientLeft of 2, so everything is shifted by 2px (for example, if you are at the position (0, 0) the pageX/pageY are -2/-2. I'm not sure why it is using this clientLeft property anyway, can anyone explain?

[dmethvin]

I can see the issue you describe in IE8. In general, cross-iframe issues are often hard to solve in older versions of IE. Since this ticket has been open a while it's unlikely we'll get to it soon. If someone can propose a simple patch that fixes the problem, please let us know by posting a message on the "Developing jQuery core" section of forums.jquery.com.