Hi,
So, after reading the winaero's post on Split Screen feature in Edge Canary, I tried it out and I really liked it.

But it should have sync scrolling feature that will allow:
- Comparing web pages is easier.
- Comparing local documents is easier.
Personally speaking, I often have to compare PDFs, and I'm not very keen on using a third-party software for it. So, for that, I use Firefox in combination with an addon to achieve that.
Adding synchronized scrolling in spit screen will enhance the usability of this feature. Even as a front-end developer, I see a potential use case in comparing webpages.