Really love the togglable examples. It's often hard to imagine how a change look and while in a perfect world I'd have time to make a mockup to test each version, well, it's hardly a perfect world so examples are appreciated!
And resizing the window is also something native application developers should embrace. Always roll my eyes when some game developer says they can only target 16:9 because they don't have other monitors - just make your window mode resizable and drag the corner.