On a recent project I was working on, I noticed that having a long list of items in an overflow: scroll container would still allow the root page to scroll as far down as the items theoretically would. You could just scroll far past the actual HTML root tag because somewhere on the page I had a long scrollable list.
The catch? I only noticed this on Safari.... and Chrome. Firefox is the only browser that doesn't shit the bed on that page.
I just find it amusing that the most annoying problem I've experienced recently with web dev was not because of Safari's "princessness" (it was doing the exact same thing as Chrome), but just because browser engines have become complex enough to be eldritch gods we just have to pray to and hope.
Finally, parity with the desktop.