Curious why you don't direct that at the company responsible for iOS?

Doesn't work well in Chrome for Android either. I'm missing part of what's on the left side and somehow can't scroll there.

Seriously? Was it Netscape's fault when someone built a site that only worked in IE?

When you use an OS that is well known for rendering html/css issues I can't see why you would be surprised and not direct that to Apple.

Why not both? I assume some rendering issues can occur, but I expect competent developers to deliver some degree of usability across mainstream browsers.

Apple don't exactly have a strong mechanism for feedback. And the rules of the game are out there already. So players have to fit the rule book. That's why people building web pages test on multi devices.