Paciello colour contrast analyser1/24/2024 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. Logotypes include Western logos or anything essential to the brand, and don't have a minimum contrast requirement.Color Contrast Analyzer in Accessibility Insights for Windows What is the Color Contrast Analyzer? Images of text (as opposed to true HTML text) still fall under these contrast requirements, with the exception of logotypes. Images of text where the text is the primary content must meet contrast requirements, see the following "images of text" section.Example: a photo of an event, with a banner containing text in the background. This refers to text that happens to be in an image, but not the central focus. Significant Image Content: if there is text or images of text that are part of an image containing other significant content, that has no contrast requirement.Text not seen by anyone: there is no contrast requirement if nobody shouldn't see the content at a given time.However, it is highly recommended to make inactive states just meet the 4.5:1 ratio and make active elements even higher contrast. disabled state) does not need to meet a contrast requirement until they can be interacted with. Inactive Components: text on an inactive element or component (i.e.Pure decoration: words used as a decorative element have no color contrast requirement (example: words repeated over and over in the background).There are some exceptions to the color contrast requirements in WCAG 2.0/2.1. Exceptions to Color Contrast Requirements Important graphical icons, and user interface controls like radio buttons and checkboxes, must also meet the 3:1 contrast ratio. The minimum contrast ratio allowed for regular or smaller text is 4.5:1.įor 14pt bolded text (18 pixels bolded) or 18pt (24 pixels) standard text, the minimum ratio is 3:1.
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