Scrolling left to right.
So as much as Google/Adobe like to put the market where they want, Microsoft can take a swing at that too.
Smartphones today are more tall than they are wide (as compared to some square-screen phones of a decade or two ago)
How about making the Top--->Bottom or top-->bottom interchangable with left--->to right? It'll just need a uniform code in how text or objects are displayed within an app or browser and having a registered class be the handle for each anchor? And then perhaps having a switch or a check box inside an application to format the view in the user's preferred solution.
It can be used to actually use the space that most PC owners have(Hence why Microsoft should take a part in this). Majority of power users/heavy PC users are most likely to also use their system as a gaming or entertainment system. Which also means wide or ultra wide screens that are suitable to detail the crisp resolution of modern day technology. But other than that its a space that goes to waste.
My browser right now, is 50% empty due to the empty white on both left and right side to centralize the text in the middle. Now of course you can ask why didnt i scale it? because my monitor is your typical gaming 4k 60fps monitor that simply if I scale it higher the text is rather too big, so if scrolling left to right was an option it would be a much more enjoyable experience.
**Infinite scrolling left to right
1-usage in making use of otherwise wasted display real estate
2-an idea to be enforced and unique to Microsoft
3-No one can really put this to use any better than Microsoft
4- Using the window's functioning Snap-in feature more practically
5- having the ability to display a browser+other apps whether vertically or horizontally due to the sheer bigger size than smartphones
6- Sounds like something that will have to be coded sooner or later to uniform formats within applications/systems/universal applications