![]() ![]() While changes in hue and saturation tend not to affect the legibility of text for people with colour vision deficiencies, changes in lightness can. The aim of this requirement is to ensure that there is enough difference in the lightness, or relative luminance, of text and background so that the text is readable by people with low vision and those who have difficulty seeing colours.Ĭolours can be defined (in the HSL colour model) using 3 attributes: hue, saturation, and lightness (or luminance). Success criterion 1.4.3 requires that the “visual presentation of text and images of text has a contrast ratio of at least 4.5:1.” WCAG 2.1 success criterion 1.4.3 - Contrast (Minimum)
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