Check text and background colors against WCAG AA and AAA contrast thresholds.
Choose the foreground text color and its background. The tool calculates the WCAG relative luminance contrast ratio for sRGB colors. AA requires 4.5:1 for normal text and 3:1 for large text. AAA requires 7:1 for normal text and 4.5:1 for large text. A passing color pair alone does not establish that an entire interface is accessible.
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