Your preferred tools and methods will likely change with experience and may grow beyond what is outlined in this article, but applying the principles and steps in this article will provide a solid foundation of what is required in WCAG 2 and how to test for it. A manual test of other potential issues using contrast checkers, ColorZilla, DevTools, Colour Contrast Analyser, or any combination of these.Įvaluating contrast and color use can take considerable time and effort, but this process will become more natural with time. The Colour Contrast Analyser (CCA) is a tool that calculates the contrast between two colours and automatically evaluates the returned value against the Web.When possible, an automated scan using WAVE or the accessibility checker in Microsoft Office 365 or 2019.Graphical objects or user interface components, as defined in WCAG 2.1.Color reliance (common in links and forms).A preliminary scan for potential issues like:. But most contrast evaluations will include at least these three "steps" (although the order may vary): you can open the image in Chrome and run Color Contrast Analyzer on the image instead of the page itself. Likewise, there is no single testing process that is best for all content. It may be useful to include a contrast ratio which can be obtained using the Colour Contrast Analyser - Color Picker method. The tools you use will depend on the content being evaluated and on personal preferences. There is no one "best" tool for testing contrast. But CCA is an excellent tool evaluating text in images, and it really shines when evaluating electronic documents, such as Word and PDF files. If an evaluator is comfortable digging into the HTML and CSS of a webpage, it is usually more efficient to use WAVE and Chrome DevTools to check contrast. To change the lightness or darkness of a color with less change to the color itself, click the sliders button (next to the eyedropper button) and check Synchronize colour values.ĬCA's greatest strength may also be its greatest weakness-it works outside the web browser. CCA will notify you if the color combination meets AA and AAA requirements for text as well as WCAG 2.1 AA requirements for non-text content. If the background is any color other than white, do the same with the Background colour eyedropper. To do this, select the eyedropper in the Foreground colour section and move the crosshairs to the text or foreground color using a mouse or the arrow keys. It accepts RGB, hex, and HSL formats, and it supports testing of colors with alpha (transparency, but the main feature that sets CCA apart is its ability to use the eyedropper tool to measure the contrast of anything on the screen. The Colour Contrast Analyser, or CCA, is a downloadable program for Windows and macOS that allows you to test contrast within any program.
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