If the WCAG 3.0 guidelines include APCA - right now, the draft mentions it and the “significant updates” it would come with - this will have consequences for style guides, website designs, and, yes, data visualizations. He’s now developing an “Advanced Perceptual Contrast Algorithm,” or APCA. Somers wasn’t the first one who found issues with the WCAG guidelines (the “orange button problem” is a thing), but he was the first one who pressed on the issue, kept writing about it, and became part of the Accessibility Guidelines Working group. If you play around with text and background color a bit, you can get some weird results: Color pairs that are better readable than other ones but get worse WCAG ratios: The WCAG contrast check was, according to Somers, “not meaningful.” The result is a “ton of apps that now incorrectly present colors as ‘accessible’ when in fact they are not.” Issue #695, opened by Andrew Somers. In April 2019, he opened issue #695 in the GitHub WCAG repo under his internet name Myndex. Some governments make them a legal requirement.īut there’s one person who doesn’t approve: Andrew Somers, Hollywood-based filmmaker and vision-impaired himself. Organizations check with them to create style guides. Sometimes, they also give you a ratio: 4.5:1 is good. They all answer the question: “Which color should your text be to be readable on your background color?” And they all give your color pairs a red FAIL ❌ or a green PASS for AA (minimum contrast) or AAA (enhanced contrast) requirements. If you’ve been choosing colors and you or your organization cares about accessibility, you’ve seen the infinite number of color contrast checkers - 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, etc. A few days ago on the internet, I stumbled upon a person who criticized what I took for granted: The W3C Accessibility Guidelines (WCAG) for color contrast.
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