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For accessibility, WCAG 2.0 AA guidelines require a contrast ratio of 3 or larger for large text, and 4.5 or larger for normal sized text. In the default mode, color2 and color3 are white and black, and the selected color pair will always have a contrast ratio greater than 4.58.
As a guide to selecting foreground and background colors for text, the Web Content Accessibility Guidelines 2.0 (guideline 1.4) classifies contrast ratios for ordinary text as follows: WCAG 2.0 text contrast ratios
The final rule states that the Web Content Accessibility Guidelines (WCAG) Version 2.1, Level AA is the technical standard for state and local governments’ web content and mobile apps. [ 31 ] European Union
Use the WCAG link contrast checker to ensure that the chosen background color offers the recommended WCAG AA level of contrast against normal text (#202122) and blue links (#3366CC for the default Vector 2022 skin). [1] WCAG AA is required by various government bodies in the US, EU, UK and Canada. When links and references are not present ...
For text against a white background, the following CSS colors do not meet the minimum contrast ratio (4.5:1) specified by Web Content Accessibility Guidelines (WCAG) 2.0 Level AA. Contrast [ d ] Color sample
You can use a few online tools to check color contrasts, including: the WebAIM online contrast checker, or the WhoCanUse site, or Snook's Color Contrast Check. Several other tools exist on the web, but check if they are up-to-date before using them. Several tools are based on WCAG 1.0's algorithm, while the reference is now WCAG 2.0's algorithm.
In articles such as "WCAG 2.0: The new W3C guidelines evaluated", [9] "To Hell with WCAG 2.0" [10] and "Testability Costs Too Much", [11] the WAI has been criticised for allowing WCAG 1.0 to get increasingly out of step with today's technologies and techniques for creating and consuming web content, for the slow pace of development of WCAG 2.0 ...
Among their other color pairs, brown (#282800) on dark green (#A0A000) has a contrast ratio of 3.24:1, which is less than the WCAG recommendation, dark brown (#1E1E00) on light green (#B9B900) has a contrast ratio of 4.54:1 and blue (#00007D) on yellow (#FFFF00) has a contrast ratio of 11.4:1. The colors named in the report use different color ...