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Enter an Alpha value to adjust the transparency of the foreground color. Use the Lightness slider to adjust the perceived lightness of the color. WCAG 2.0 level AA requires a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text.
WebAIM offers an online contrast checker that will present the contrast difference between two colors, and will help you identify a color that meets the desired level of contrast. To use our contrast checker, enter Hex color values in the Foreground Color and Background Color fields.
That means there are 2 contrast ratios to consider: The contrast ratio between the white exclamation mark and the red triangle, which is over 3:1 The contrast ratio between the red triangle and the gray background, which is less than 3:1.
Enter link, body text, and background colors in RGB hexadecimal format (e.g., #FD3 or #F7DA39) or use the color pickers. The Lightness sliders can be used to adjust the selected color. Feedback will be presented for all three required contrast calculations.
Non-underlined links need 3:1 contrast with body text, plus a change, like underlining, on hover and focus. Check colors in WebAIM's contrast checker . Manually check contrast in icons and images.
The contrast checker is only available for the "color:" property. While you can use DevTools to find the color styles for borders, outlines, etc., you will need to use other contrast tools to determine their contrast ratio.
WAVE ® is a suite of evaluation tools that helps authors make their web content more accessible to individuals with disabilities. WAVE can identify many accessibility and Web Content Accessibility Guideline (WCAG) errors, but also facilitates human evaluation of web content.
Array of contrast information for each contrast item: WCAG contrast ratio, text foreground color, text background color, and true/false if the text is considered "large text" per WCAG's definition. Examples
The extension can check intranet, password-protected, dynamically generated, or sensitive web pages. Also, because the WAVE extension evaluates the rendered version of your page, locally displayed styles and dynamically-generated content from scripts or AJAX can be evaluated.
WAVE helps its users better evaluate the things that automatic tools cannot check. For example, WAVE cannot tell you if your alternative text is equivalent and appropriate, so it instead reveals the alternative text so it can be evaluated by the WAVE user.