Your list is missing an entry:
0. The existence of a scrollbar tells you there's something to be scrolled.
Flat UIs are pretty good at accidentally hiding the fact that not all of the content fits on screen on in whatever borderless frame.
0. The existence of a scrollbar tells you there's something to be scrolled.
Flat UIs are pretty good at accidentally hiding the fact that not all of the content fits on screen on in whatever borderless frame.
Also fun when websites that are waging their holy war against the bars don't anticipate that I'm zoomed in a bit. Having to delve into devtools to disable "overflow: hidden" is a delight.
There’s about a million different secret handshakes and gestures in iOS UI, but I consider the most egregious UI failure to be the “Share” button, which manages to pop up a modal in such a way that it often disguises both that it can be be scrolled vertically AND that it can be scrolled horizontally.