What role does font size play in color contrast?

Font size doesn't directly determine color contrast. However, it can influence the perceived contrast when text is involved.

Color contrast is a measure of the difference in light between font color (or any graphic element) and its background. It's crucial for readability and accessibility, particularly for people with visual impairments.

While the font size itself doesn't affect contrast, larger text can enhance the perception of contrast. This is because larger text typically has larger strokes, which can make the difference in light between the text and background more apparent, even if the actual contrast ratio remains the same.

However, it's important to note that font size doesn't replace the need for proper color contrast. The Web Content Accessibility Guidelines (WCAG) recommend a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text. These ratios should be calculated using the relative luminance of the colors, not just their visual impact.