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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.
For other usage, here is a selection of tools that can be used to check that the contrast is correct: 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 ...
An example of how text with low colour-contrast appear to someone with the commonest form of colour-blindness, red/green. If you have default settings on Wikipedia, and are reading this page on a screen, then you probably can't read the following: This is a secret message. because it has blue text on a blue background.
The first web accessibility guideline was compiled by Gregg Vanderheiden and released in January 1995, just after the 1994 Second International Conference on the World-Wide Web (WWW II) in Chicago (where Tim Berners-Lee first mentioned disability access in a keynote speech after seeing a pre-conference workshop on accessibility led by Mike Paciello).
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
This is useful for selecting a foreground/background color pair. 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.
The Web Content Accessibility Guidelines 1.0 (known as WCAG) were published as a W3C Recommendation on 5 May 1999. A supporting document, Techniques for Web Content Accessibility Guidelines 1.0 [35] was published as a W3C Note on 6 November 2000. WCAG 1.0 is a set of guidelines for making web content more accessible to persons with disabilities.
You can check contrast level using the WebAIM contrast checker by setting the foreground color to the blue link color. Contrast should be at the minimum WCAG AA level and, whenever possible, at WCAG AAA level. Wikipedia:Manual of Style/Accessibility/Colors has a set of colors that comply with WCAG AAA and WCAG AA for unvisited links and normal ...