The Best CSS Unit Might Be a Combination

CSS units like px, rem, and em each serve different purposes and can be combined using functions like clamp(), max(), and calc() to create more flexible designs. Rather than choosing one unit type, developers can express design intent more clearly by combining units that represent different relationships - using rem for consistency across pages, em for local context, and px for fixed values. This approach allows for better negotiation between user preferences and design requirements, particularly for typography and spacing.