IETC compareDocumentPosition2 test case fails in WebKit
According to the spreadsheet, I think abarth had planned to take a look.
http://samples.msdn.microsoft.com/ietestcenter/domcore/Node_compareDocumentPosition2.htm is a better URL.
See also: bug 108274.
This has been fixed by r153660.
See bug 119316 - compareDocumentPosition() should report PRECEDING or FOLLOWING information even if nodes are disconnected
That change is about to be reverted though.