I'm looking at Google's web-based user interface for managing an enterprise's Chrome devices.
Each device's status is represented by a colored circle (see images below).
I would have thought that this would be violating accessibility principles - users suffering from color-blindness would not be able to distinguish the 'good' state from the 'bad' or 'unknown' states.
Or is there something special about these colors that the majority of color-blind people can somehow tell the difference?
The actual colors used are simply the named web colors 'red' and 'green'.
The reason I'm asking is that, on my team, we are considering incorporating the same design elements into our web application, and I'm worried that this would be unusable by a noticeable percentage of the public.