Scrollbar Blindness
In 2011, Apple released Mac OS X Lion which introduced an enhanced scrollbar behavior that made scrollbars hidden by default. The scrollbar appears when the user starts scrolling a document and disappears after the scrolling stops.
It appears, however, that this enhancement did not only change the user interface, but has also shaped how developers (don't) think about that specific UI element when creating cross-platform solutions. I call it scrollbar blindness.
Lately, for some reason, I've started to notice more of it. I have been to numerous websites that have elements with
overflow-y
oroverflow-x
set toscroll
while the element is not meant to be scrollable. For no apparent reason, some even set bothx
andy
axes scrollable or create multiple levels of stacked scrollbars.
Source: Scrollbar Blindness, an article by Sven Kadak.