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What is the accessibility problem with color-only status and two fixes?

Source: w3.orgbeginner

This tests WCAG 1.4.1 Use of Color: red-green status is invisible to many colorblind users. A strong answer names two non-color cues like icons or text labels. A red flag is claiming high contrast alone fixes the problem without a secondary visual indicator.

This tests WCAG 1.4.1 Use of Color: relying solely on hue like red or green excludes colorblind users and those on monochrome displays. A strong answer identifies the barrier and proposes two distinct non-color cues, such as pairing an error icon with red and a checkmark with green, or adding visible text labels like Error and Success. A red flag is suggesting that high contrast or luminance differences alone resolve the issue without a secondary visual indicator.

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What is the accessibility problem with color-only status and two fixes? · Tezvyn