*It was fixed by replacing the HDMI cable.* Unfortunately that only fixed it on ...

robocat · on March 14, 2019

I agree.

I admit I am still unsure how to decide what is an acceptable colour difference in the face of both human issues and technological complications.

onion2k · on March 14, 2019

There are tools out there - https://webaim.org/resources/contrastchecker/

Google actually added a new 'AAA' contrast checker to Chrome 73 in the devtools ('AA' was already there). https://www.youtube.com/watch?v=uddZX9ZK6wY

robocat · on March 15, 2019

I just tested that on pure red, and iOS button blue, on a white background. They both fail the AAA contrast test (on WebAIM and Google devtools).

The majority of apps and websites would fail the AAA test in heaps of places (unless they have a "high-contrast mode").

#F00 on #FFF: fail on AAA (pure red on white: contrast 4).

#07F on #FFF: fail on AAA ("iOS" button blue on white: contrast 4.13).

onion2k · on March 15, 2019

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.