checkbox Information conveyed with color must be understood without color.

Roughly 1 in 20 people have some sort of color vision deficiency or are "color blind."

It is important that you design your Web pages so that all information conveyed with color can be understood without color.

For example, when providing an online syllabus, do not specify that quiz dates in red are real, while quiz dates in green are only practice. Certain colors, such as red and green, are not distinguishable to people with color vision deficiencies.

Learn more about color vision disabilities at VisCheck.

checkbox Text color must be in high contrast to the page’s background color or background image.

This guideline is especially beneficial to people with low vision. Some things to look out for include:

  • The color of your text and background colors should be in sharp contrast to each other. Ex: do not use yellow text on a white background. Black on white or white on black is fine.

  • Try to avoid "busy" wallpaper backgrounds. Text often disappears on these textured and patterned wallpaper.

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