The Technical Foundation
Color on screens is defined by three primary systems: HEX (hexadecimal notation), RGB (red, green, blue channels 0-255), and HSL (hue, saturation, lightness). All three describe the same colors — they're just different representations of the same underlying data. Converting between them is lossless and mathematical.
Practical Color Work
This aspect of color work requires balancing aesthetic goals with technical constraints. Understanding the specific color format, context, and delivery medium ensures your color choices look correct across devices, browsers, and viewing conditions.
Accessibility and Contrast
WCAG 2.1 requires a minimum 4.5:1 contrast ratio between text and background for normal text, and 3:1 for large text (18pt+ or 14pt+ bold). These requirements exist because poor contrast makes text unreadable for people with low vision or in challenging viewing conditions. Always verify contrast ratios for text-on-background color pairs.
Color Systems and Design Tokens
Ad-hoc color choices create inconsistency that compounds as projects grow. Systematic color palettes with defined shade scales, semantic naming, and CSS custom properties make color consistent, maintainable, and easy to update. Investing in color system thinking early pays dividends throughout a project's lifecycle.
Mastering color in web and UI development requires both technical knowledge of color formats and systems thinking about how colors work together. Use tools that let you see conversions, check contrast, and build palettes systematically to make better color decisions faster.