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Re: Contrast and Color Accessibility, Understanding WCAG 2 Contrast and Color Requirements

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From: Jonathan Avila
Date: Dec 4, 2018 1:23PM

There were 2 github issues on the WCAG github repository discussing the question of comparing hover and other states for contrast under SC 1.4.11 non-text contrast. The links are provided below. Based on my understanding the difference between hover and non-hover states do not require 3:1 contrast as there are other indicators provided for hover such as a change in the pointer. Each state alone must have sufficient contrast for text and non-text items if the contrast of those non-text items is the only way of communicating something visually. But you don't need to compare those states to each other.

Warning -- these links are provided as the open discussion of the issue and the discussion may be confusing to some -- so I only recommend them for those who really want to dig into the theoretical discussion -- although proposed responses are provided at the end. One issue was closed while the other open -- so I would assume further clarification of the response from the Accessibility Guidelines Working group in the form of updates to the understanding document will be forthcoming.
https://github.com/w3c/wcag/issues/400
https://github.com/w3c/wcag21/issues/913

Use of contrast as the only differentiator for the focused and non-focused state is a separate issue and under discussion.

Jonathan

Jonathan Avila, CPWA
Chief Accessibility Officer
Level Access
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