Remove reference to "black/white color blindness"

[jkshapiro]

Not clear what that even is.

Also, a relative contrast of 3:1 is either good enough or it isn't. There is a usability benefit to underlining links, since that's the standard way of doing things, but it's disingenuous to say that 3:1 is insufficient for distinguishing links from surrounding text.

[JAWS-test]

I think, black/white color blindness means that no colors are seen at all (i.e. only black, white and all shades of gray in between). This is different from e.g. the widespread red-green blindness, where only red and green tones cannot be distinguished.

I don't mind deleting the mention of black/white color blindness here, because it's really not crucial for the recommendation to underline links.

However, I am strongly against deleting the whole sentence because it is very important. 3:1 contrast to fulfillment of SC is only an exception and not optimal. Especially links in running text that contrast only 3:1 from the text are hard to distinguish even for people without visual impairments (if the text color is e.g. gray and black) as you can see at https://www.w3.org/WAI/WCAG20/Techniques/working-examples/G183/link-contrast.html.

[ollie-iterators]

You could change black/white color blindness to achromatic, or achromatopsia. A person who has achromatopsia can only see things as black and white or in shades of gray.

[GreggVan]

We are striving for plain language This would be a couple steps in the other direction I think gregg

------------------------------ Gregg Vanderheiden ***@***.***

On Jan 5, 2023, at 6:29 AM, Ollie ***@***.***> wrote: You could change black/white color blindness to achromatic — Reply to this email directly, view it on GitHub <#2895 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACNGDXWENAK2GD64RFOUBA3WQ3LFXANCNFSM6AAAAAATRJVZNQ>. You are receiving this because you are subscribed to this thread.

gregg ——————————— Professor, University of Maryland, College Park Founder and Director Emeritus , Trace R&D Center, UMD Co-Founder Raising the Floor. http://raisingthefloor.org The Global Public Inclusive Infrastructure (GPII) http://GPII.net The Morphic project https://morphic.org

[jkshapiro]

Red/green colour blindness is called that because people with that condition have difficulty distinguishing between red and green. Similarly blue/yellow colour blindness. There really isn't such a thing as black/white colour blindness, unless you're referring to ordinary blindness.

The term "complete colour blindness" might fit the bill. But I don't think we need to refer to colour blindness at all. Check out #2899 for a revised proposal.