How to Use a Contrast Ratio Checker Tool

A Contrast Ratio Checker is a tool used to determine if the contrast between two colors meets the WCAG (Web Content Accessibility Guidelines) standards for accessibility. The contrast ratio is calculated using the formula: (L1 + 0.05) / (L2 + 0.05), where L1 is the luminance of the lighter color and L2 is the luminance of the darker color.