slider input innaccurate when remote page has been scrolled down

[2bndy5]

Seems like the mouse events are not getting offset from the top of the page, but rather they are offset from the top of the browser window's view port of the meaning:

• vertical slider works fine when remote page is scrolled all the way to the top
• vertical slider gets offset the same amount of pixels that are missing from the top of the remote page when scrolled down.

I could be wrong about this diagnosis, but this is the impression I get when experiencing this bug.