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If you get this error result, you have one or more portions of colored text that has less than a 4.5:1 contrast ratio with white (#FFFFFF;), the assumed background color.
The checkboxes are provided so that when you change the color, you can also address the Avoid using color alone for emphasis suggestion. It's strongly recommended that when you do use the checkboxes use the one for bold instead of italics as italics are generally harder to read. Below the checkboxes are a collection of color swatches. When choosing your colors, pay close attention to the “Ratio Invalid.” If this appears, your ratio has still not met accessibility standards. If it is not listed, the colors you chose meet accessibility standards. Note: please avoid using blue shades for non-linked text.
Unfortunately, the Accessibility Checker (UDOIT) is not programmed to detect font size or background color (it's assumed to be white) which can lead to both false positives and false negatives.
To get a false positive (results which can be ignored), the following must be true:
To get a false negative, you need to have text on a colored background which has a 4.5:1 contrast with white but does not have the appropriate contrast ratios listed above for the colored background.