kAAAMinimumRatioLargeText constant
The minimum contrast ratio for large text (bold ≥14px or ≥18px).
Defined by WCAG AAA standard http://www.w3.org/TR/UNDERSTANDING-WCAG20/visual-audio-contrast-contrast.html
Implementation
static const double kAAAMinimumRatioLargeText = 4.5;