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Re: 1.4.1 use of color for state indicator

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From: Jonathan Avila
Date: Mar 9, 2020 5:57AM

If something has contrast >= 3:1 then and that contrast communicates the meaning even when in grayscale then it would not fail the 1.4.1 Color requirement as Color (Hue) is not being used -- luminance is being used to communicate the difference.

So if you have a selected button that is inverted from the other colors and that selected state itself and the difference from the adjacent selected states >= 3:1 then it would pass. Comparison between non-adjacent selected states is something of a challenge as it's not clearly stated -- but I'd argue that if the difference between selected states only used luminance that was < 3:1 compared to the other selected state then it would not pass.

Jonathan