This is my first time reporting a bug in a pre-release iOS version, so I just want to make sure I'm doing it right. I filed a bug report against iOS just now:
#22559860
Basically, the old Android bug https://css-tricks.com/webkit-sibling-bug/ where CSS sibling selectors (~) don't work has popped up in iOS 9, but only in web views, not in Safari. I suspect the old Android workaround of animating body padding (at the expense of CPU/Battery) would work here. Obviously, it'd better if Apple fixed this before general release though!
Anything more I can do to make sure this gets on Apple's hot-list?