https://bugs.winehq.org/show_bug.cgi?id=48006
--- Comment #47 from Jacek Caban jacek@codeweavers.com --- (In reply to Gabriel Ivăncescu from comment #46)
Off the top of my head (though this is based on old info and probably missing a bunch of stuff), it needs Typed Arrays for sure, DOM Parser parseFromString, better responseXML and crypto getRandomValues.
None of that is present in Andrew's branch.