IETC compareDocumentPosition2 test case fails in WebKit http://samples.msdn.microsoft.com/ietestcenter/domcore/showdomcoretest.htm?Node_compareDocumentPosition2 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.
Mass moving XML DOM bugs to the "DOM" Component.
Safari Technology Preview 152 pass all of these cases as per WPT: https://wpt.fyi/results/dom/nodes/Node-compareDocumentPosition.html?label=experimental&label=master&aligned Marking this as "RESOLVED CONFIGURATION CHANGED". Thanks!