William

This isn’t a screen aspect ratio. It’s a ratio of 1 portion of the screen to another portion of the screen.

It’s short for 90%:10%. 1 app uses 90% of the screen and another uses 10% of the screen.

It’s not comparing the length of 1 edge of the screen to a perpendicular edge of the screen.

I was going to say they should only be comparing them under the same driving areas, since I know they aren’t allowed in many areas.

But you’re right, it’s even tighter than that.