Totally agree. And a non-human issue with your example:
We had #EEF as a subtle light-blue 5px resizer handle on a #FFF background. However the resizer handle was invisible on a newly unboxed monitor the other day (benq 32 inch 4k monitor) - because it was showing up as white on white.
It was fixed by replacing the HDMI cable.
I think the HDMI connection was dropping back to a lower bitrate. Screenshot, and displaying the screenshot on another monitor, showed that the blue resizer line was there but it was not being displayed correctly.
Yes. 'Pure' colors tend to be bright, so white text doesn't contrast well enough. As a rule, designers don't use the pure color. I suspect lots of sites get accessibility wrong because developers prioritize using nice round numbers (eg F00 rather than D00) instead of accessible colors.
We had #EEF as a subtle light-blue 5px resizer handle on a #FFF background. However the resizer handle was invisible on a newly unboxed monitor the other day (benq 32 inch 4k monitor) - because it was showing up as white on white.
It was fixed by replacing the HDMI cable.
I think the HDMI connection was dropping back to a lower bitrate. Screenshot, and displaying the screenshot on another monitor, showed that the blue resizer line was there but it was not being displayed correctly.