Reducing blackness of text to color is a mistake. Effective perceived contrast really depends on weight, size, tracking and leading. Same color looks darker wit

Reducing blackness of text to color is a mistake. Effective perceived contrast really depends on weight, size, tracking and leading. Same color looks darker with heavier font and less contrasty with thinner type set more speciously. Compare body text in Swift docs in Safari (uses macOS system font stack so may look differently on other systems) and Django docs for an example.