[ionforce]

> how does it know where to zoom

If it's a single element/app, it will just transition to a more detailed mode.

If it's a 2D canvas, it will be the center of that canvas. Kind of like how the zoom widget on Google Maps works today.

[6thSigma]

That's what I figured. That seems like it would be incredibly clunky to use. Turn the dial, scroll up, turn the dial some more, scroll left.