![]() ![]() The information conveyed graphically is also conveyed through visible text.For example, logos, photos real life scenes, illustrations using realistic colors, and screenshots are exempt from the contrast requirement. A particular presentation is essential, and presenting it with sufficient contrast would undermine its meaning.You do not need to test any graphical object where: UI components whose appearance is determined by the browser and not modified by the authorĮxamine the app to identify any graphical objects (such as icons, charts, diagrams, and illustrations) that contain meaningful elements that might have low contrast against the background.Low contrast between different states (normal, focused, mouseover, selected).Part of an inactive (disabled) componentĮxamine the app to identify any UI components (controls) that might have:.You do not need to test any text that is: How to test contrast ratio Identify elements to test TextĮxamine the app you want to test and identify any instances of meaningful text that might have a low background-to-foreground color contrast. 4.499 does not meet the threshold of 4.5 for regular text. Any active (non-disabled) UI component or meaningful graphical element with a contrast ratio below 3.0 fails.Any UI component or meaningful graphical element with a contrast ratio of 3.0 or greater passes.Any text with a contrast below 3.0 fails.Īccording to WCAG 2.1 AA Success Criterion 1.4.11:. ![]() Large text (18pt or 14pt bold) with a contrast of 3.0 or greater passes.Any text with a contrast of 4.5 or greater passes.Minimum contrast requirementsĪccording to WCAG 2.0 AA Success Criterion 1.4.3: The problems can be exacerbated if the person has a color vision deficiency that lowers the perceived contrast even further. People with low vision often have difficulty reading text, identifying buttons that do not contrast with their background, or determining the state of UI components. Why contrast ratio mattersĮnsuring adequate contrast makes it easier for everyone to read text content, interpret graphical elements, identify UI components, and notice when those components change state. You can also watch a short video to learn more about the Color Contrast Analyzer. All other color combinations fall somewhere in between. Identical colors have the lowest possible contrast ratio, 1:1. ![]() Black and white have the highest possible contrast ratio, 21:1. In general, higher contrast ratios make text and graphics easier to perceive and read. The Color Contrast Analyzer is a feature in Accessibility Insights for Windows that helps developers investigate contrast ratios.Ĭontrast ratio describes the relative brightness of foreground and background colors on a computer display. Color Contrast Analyzer in Accessibility Insights for Windows What is the Color Contrast Analyzer? ![]()
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