![]() This score comes by detecting the color of the background element and comparing it with the color of the text. In the area I’ve highlighted with a red square below you’ll see the contrast ratio score of 5.00 this text element has been given. Select a text element and click the colored square to start Then, in the Styles tab, locate the color property, and to the right of it it click the small color swatch in order to open up the picker tool. Access the Contrast Checker Toolsīegin by opening Chrome/Chromium DevTools and selecting any text element in your HTML. The functionality is now built right into both Chrome and Chromium. Note: You might see some instructions around the web saying you need to enable “Developer Experiments” to use these color contrast checking features but this is no longer the case. This is part of the recently added accessibility tools in Chrome–let’s take a look and see how it all works. If you look closely you can also see there is some additional information in that color picker, such as the display of a contrast ratio score, that helps give feedback on color choices. You’ll notice in the above screenshots we see the Chrome DevTools color picker. This tutorial is part of Web Accessibility: the Complete Learning Guide, where we’ve collected a range of tutorials, articles, courses, and ebooks, to help you understand web accessibility from the beginning. So how can we be certain our color contrast levels are accessibility friendly? That’s where Chrome DevTools can help out. Sometimes color contrast might look fine to the eye, but in reality may not be up to par. This might be a relatively straight forward concept, but ensuring sufficient contrast in practice can actually be a little tricky. This contrast level is all good: Example of a good text contrast ratioīut if we make the text lighter, we can quickly reach a point where the contrast is too low and it becomes too difficult to read: The same text adjusted now has a bad contrast ratio ![]() And in turn, creating readable text means ensuring you have adequate color contrast between your text colors and your background colors.įor example, take a look at the purple text on white background from the homepage of Tuts+. Note: if you choose to use the colour picker instead, be sure to avoid anti-aliased colours, as this would have an impact on the result.įor more information about colour contrast in general, there is a dedicated chapter: Colors and contrast.One of the most important aspects of creating accessible websites is ensuring you have readable text. The evaluation uses the recommendations from the Web Content Accessibility Guidelines for colour contrast level AA and colour contrast level AAA. Simply enter a foreground and a background colour into the respective fields and the CCA returns whether or not the contrast ratio is sufficient, depending on the kind of visual content and size. The Colour Contrast Analyser (CCA) is a tool that calculates the contrast between two colours and automatically evaluates the returned value against the Web Content Accessibility Guidelines.Īs it does not have an installer, you can simply extract it to a folder of your liking. Having sufficient contrast between foreground and background colours is an essential part of usability in general and accessibility in particular.
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