The user can support whatever screen/window sizes they want, and set increments as they wish.

I just do mobile and desktop because I'm mainly doing dev work and want to spend as little time as possible on the site.

There is a bug right now where zoom is broken. It did work correctly, and it will work correctly — in general I feel it's important that the browser controls work as expected (one of the big problems Flash had).

In our case, the page should adapt to the window unless the window was zoomed — when the window size changes, I have to determine if the user changed the window manually or if he/she simply zoomed.

It's quite complicated with Apple's pinch-to-zoom, because that creates a situation where you have two completely different zoom mechanisms that can both be in play at the same time.

And, if you zoom then reload the page, the zoom is still in effect.

It did work correctly then I recently broke it while fixing a different bug. I'll get it fixed ASAP.

Thanks for sharing your thoughts, I really appreciate it.