Microsoft has been working on a new version of the Edge browser for a while now, it was launched for standard Windows 10 in early January and the new version is based on Chromium, the same browser engine that powers Google Chrome, hence the name. The Chromium version of Edge actually works on Mac too.
The news now is that the new version of Edge now works on the Surface Pro X and other Windows 10 machines which are ARM based, before this Edge had to be emulated which took up unnecessary resources.
ARM64 support is now live in Stable Version 80.0.361.48! To ensure you're on the latest update, head to edge://settings/help. If you haven't downloaded our Stable version, head over to: https://t.co/Xd66e3h79M for info on how to get that.
— Microsoft Edge Dev (@MSEdgeDev) February 7, 2020