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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 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
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 ...
Typically they take a web page or image file as an input, and render a colour-blind simulated image as output: Mozilla Firefox color-blind addons; Sim Daltonism simulates color blind vision and displays the results in a floating palette for macOS and iOS. Freeware. Color Oracle downloadable, free color blindness simulator for Windows, Mac and ...
Download QR code; Print/export ... reduces contrast-check. A bias of 1.25, reduces the possible minimum to 4.0, which may not meet accessibility standards ...
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
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).