Accessible Contrast
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A sufficient difference in luminance between foreground and background colors that ensures readability for users with visual impairments.
Accessible contrast goes beyond simply meeting WCAG numerical thresholds. It involves considering the full context of how colors are used: text size and weight, surrounding colors, the viewing environment, and the target audience. A color pair that technically passes 4.5:1 may still be hard to read if the text is thin, the background is patterned, or the viewer is in bright sunlight. Best practices include testing contrast on actual devices, considering the lowest-common-denominator display, and preferring higher contrast ratios when possible. Tools like APCA (Advanced Perceptual Contrast Algorithm) are emerging as more perceptually accurate alternatives to the current WCAG formula.
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