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Suggested minimum contrasts for APCA (WCAG values in parentheses, stricter than official standard; rows give text color, columns background):
Body text: at least Lc 75 (7:1), better Lc 90 (8.5:1), especially for small text
Other text: at least Lc 60 (6:1), better Lc 75 (7:1), for large headlines at least Lc 45 (4.5:1)
Disabled text, placeholder text: at least Lc 30 (3:1), better Lc 45 (4.5:1)