Our big, single-page JavaScript app does not work at all in the Edge browser. (We officially support it in Chrome and Firefox, we don't allow it to be used in IE because it only half works there, and we chose not to do all the IE specific work.)
I have submitted issues in the past to the webkit team via their bugzilla tracker.
I have googled around and do not see a way to submit issues to the Edge team at all.
Is there a known way to collaborate with Microsoft on Edge?
UPDATE
The Edge browser ROCKS. MS killed it with this one. We were able to fix our issues (we had a logging lib that was specif to ffox and chrome), and found Edge to be completely issue-free once that was done.
Nice work (amazing, awesome work) Microsoft and Edge team!