It appears that absolute positioned elements that are relative to another absolute positioned element are being laid out at an incorrect location. The url http://chief.corp.farecompare.com/resources/v2/components/myalerts/tests/test-abs-abs.html shows a calendar that if you click on the 'March 2009' text you will see an element absolute positioned appear next to the click. If you click the down arrow image next to the Mar 2009 text the abs positioned element appears at the top of the screen. The javascript code is using prototypejs Element.clonePosition to determine the location for the absolute positioned element.
The url in original text should have been: http://stg.farecompare.com/resources/v2/components/myalerts/tests/test-abs-abs.html
Looks like this has been fixed at some point. Works fine for me on Chromium 12 and against trunk.
Do we know when it got fixed? Should we land a regression test?